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1
Kumaraswamy, Balachandra. "SIMPLIFIED 2-state Detectors for SOQPSK-TG and SOQPSK-MIL." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604471.
Full textAbstract:
ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>We study simple trellis-based detectors for SOQPSK that have a minimal level of complexity. In
particular, we show that the state complexity can be cut in half relative to previous approaches—from 4
states down to 2—with asymptotically optimum performance. We give two possible means of achieving
this: the pulse amplitude modulation (PAM) technique and the pulse truncation (PT) technique; both
of these techniques make use of recent advances in SOQPSK technology based on a continuous phase
modulation (CPM) interpretation of SOQPSK. The proposed simplifications are significant since trellis-based
SOQPSK detectors are 1–2 dB superior to widely-deployed symbol-by-symbol detectors. These
performance gains come at the expense of complexity, and the proposed 2-state detectors minimize this
expense. Thus, these simple detection schemes are applicable in settings where high-performance and low
complexity are needed to meet restrictions on power consumption and cost.
2
Nash, Christopher, and Christopher Hogstrom. "SOQPSK Software Defined Radio." International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596411.
Full textAbstract:
ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NV<br>This paper presents the results of laboratory experiments using a commercial-off-the-shelf software defined radio to demodulate SOQPSK-TG for aeronautical telemetry. Using the NI USRP N210 and Zynq™ processor, we achieved 900 kbits/s demodulation and found that the USRP N210 has a signal sensitivity of -71 dBm at a BER of 10⁻⁶.
3
Rice, Michael, Gayatri Narumanchi, and Mohammad Saquib. "Decision Feedback Equalization for SOQPSK." International Foundation for Telemetering, 2012. http://hdl.handle.net/10150/581839.
Full textAbstract:
This paper investigates a fractionally-spaced decision-feedback equalization technique for Shaped Offset Quadrature Phase Shift Keying (SOQPSK). The kernel of the block-based feedback algorithm is to estimate the intersymbol interference and cancel it from the samples used to make the bit decisions. This process refines the bit estimates sequentially, thereby increasing the probability of obtaining accurate estimates. The simulated bit error rate performance of the decision-feedback technique shows a 1 dB improvement over MMSE-equalized SOQPSK-TG over channels derived from multipath channel measurements at Cairns Army Airfield, Ft. Rucker, Alabama and Edwards AFB, California.
4
Chandran, Prashanth. "SYMBOL TIMING RECOVERY FOR SOQPSK." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604518.
Full textAbstract:
ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>Shaped offset quadrature phase shift keying (SOQPSK) is a highly bandwidth efficient modulation technique used widely in military and aeronautical telemetry standards. It can be classified as a form of continuous phase modulation (CPM), but its major distinction from other CPM schemes is that it has a constrained (correlated) ternary data alphabet. CPM-based detection models for SOQPSK have been developed only recently. One roadblock standing in the way of these detectors being adopted is that existing symbol timing recovery techniques for CPM are not always applicable since the data symbols are correlated. We investigate the performance of one CPM-based timing error detector (TED) that can be used with SOQPSK, and apply it to the versions of SOQPSK used in military (MIL-STD SOQPSK) and telemetry group (SOQPSK-TG) standards. We derive the theoretical performance limits on the accuracy of timing recovery for SOQPSK, as given by the modified Cramer-Rao bound (MCRB), and show that the proposed TED performs close to these bounds in computer simulations and is free of false-lock points. We also show that the proposed scheme outperforms a non-data aided TED that was recently developed for SOQPSK. These results show that the proposed scheme has great promise in a wide range of applications due to its low complexity, strong performance, and lack of false-lock points.
5
Geoghegan, Mark. "OPTIMAL LINEAR DETECTION OF SOQPSK." International Foundation for Telemetering, 2002. http://hdl.handle.net/10150/606382.
Full textAbstract:
International Telemetering Conference Proceedings / October 21, 2002 / Town & Country Hotel and Conference Center, San Diego, California<br>Shaped Offset QPSK (SOQPSK), as proposed and analyzed by Terrance Hill, is a family
of constant envelope waveforms that is non-proprietary and exhibits excellent spectral
containment and detection efficiency. Detection results using the filtering found in
conventional OQPSK demodulators have been published for two variants of SOQPSK,
namely SOQPSK-A and –B. This paper describes a method of synthesizing an optimal
linear detection filter, with regard to bit error probability (BEP), and presents the
resulting performance.
6
Wahlgren, Max, and Daniel Forsberg. "Hårdvarubaserade SOQPSK-algoritmer : En VHDL-implementation av algoritmer för att modulera & demodulera SOQPSK-signaler." Thesis, Linköping University, Department of Science and Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-12327.
Full textAbstract:
<p>Beroende på i vilken miljö man har tänkt att använda trådlös kommunikation behöver man hitta en modulationsteknik som passar under rådande förhållanden. I början på 1980-talet utvecklade den Amerikanska militären en modulationsteknik som kallas för Shaped BPSK (SBPSK) avsedd att tillämpas i kommunikationslänkar med satelliter. Vidareutveckling av SBPSK ledde sedan fram till en förbättrad variant kallad Shaped Offset QPSK (SOQPSK). På senare år har denna modulationsteknik börjat användas i civila tillämpningar och vidareutvecklats ytterligare för att ge den än bättre prestanda. År 2004 antogs SOQPSK som en modulationsteknik i den internationella flygplanskommunikationsstandarden, IRIG-106. Versionen av SOQPSK som antogs i IRIG-106 har flera bra egenskaper som t. ex. dess spektraltäthet. Detta gör denna typ av modulationsteknik lämpad för kommunikationslänkar med bl.a. flygplan, satelliter och rymdsonder (‘deep-space’).</p><p>Målet med examensarbetet har varit att implementera algoritmer för att skicka och ta emot SOQPSK-modulerade signaler. Dessa algoritmer skulle utvecklas i VHDL för att sedan syntetiseras och programmera en FPGA. Uppgiften har givits av Syncore Technologies AB i Linköping.</p><p>Arbetet har resulterat i fungerande implementationer både i mjukvara och hårdvara. Hårdvarulösningen är verifierad att klara bithastiheter upp till 30 Mbit/s. Teoretisk information om allmän modulering/demodulering och specifikt kring SOQPSK behandlas i rapporten. Uppbyggnaden av en teoretisk sändar- och mottagarmodell utformad för SOQPSK-kommunikation beskrivs också i rapporten för att ge en bättre helhetsbild av implementationen som utförts.</p><p>Arbetets syfte är att ligga till grund för Syncore AB som utvecklar en kom- munikationslänk med SOQPSK-kompatibilitet.</p>
7
Rice, Michael, Mohammad Saquib, and Erik Perrins. "Estimators for iNET-Formatted SOQPSK-TG." International Foundation for Telemetering, 2014. http://hdl.handle.net/10150/577462.
Full textAbstract:
ITC/USA 2014 Conference Proceedings / The Fiftieth Annual International Telemetering Conference and Technical Exhibition / October 20-23, 2014 / Town and Country Resort & Convention Center, San Diego, CA<br>This paper presents algorithms for estimating the frequency offset, multipath channel coefficients, and noise variance of iNET-formatted SOQPSK-TG. The estimators compare the received signal samples corresponding to the iNET preamble and attached sync marker (ASM) bits to a locally stored copy of the SOQPSK-TG samples corresponding to the same. The mean and variance of the three estimators over ten test channels derived from channel sounding experiments at Edwards AFB is presented. The results show that usable estimates are achievable.
8
Sahin, Cenk, and Erik Perrins. "FINITE BLOCKLENGTH SYMMETRIC INFORMATION RATE OF SOQPSK." International Foundation for Telemetering, 2016. http://hdl.handle.net/10150/624223.
Full textAbstract:
In this paper we compute a lower bound, namely the dependence testing (DT) bound, on the maximum
achievable rates (expressed in bits/channel use) with military standard shaped-offset quadrature phase
shift-keying (SOQPSK-MIL) and aeronautical telemetry SOQPSK (SOQPSK-TG) schemes over additive
white Gaussian noise (AWGN) channels under finite code blocklength, probability block error and
equiprobable input constraints. The DT bound results for SOQPSK-MIL and SOQPSK-TG are used to
lower bound their respective spectral efficiencies (expressed in bits/s/Hz). We simulate a serially concatenated
convolutional code (SCCC) using SOQPSK-MIL as the inner code, and show that it performs within
1:1 dB of the SOQPSK-MIL DT bound for various coding rates. The numerical results also demonstrate
the performance loss compared to the channel capacity due to the finite blocklength constraint.
9
Ravert, Jeffrey. "ON FREQUENCY OFFSET COMPENSATION FOR EQUALIZED SOQPSK." International Foundation for Telemetering, 2016. http://hdl.handle.net/10150/624246.
Full textAbstract:
This paper describes the use of a phase lock loop (PLL) to compensate for and remove a residual
frequency offset when using data-aided estimators to equalize SOQPSK-TG. The problems of
multipath and residual frequency offset will be shown my example. An equalizer followed by a
PLL will be shown to be a viable option to mitigate multipath and residual frequency offset by
example.
10
Nelson, Tom. "REDUCED COMPLEXITY TRELLIS DETECTION OF SOQPSK-TG." International Foundation for Telemetering, 2006. http://hdl.handle.net/10150/604055.
Full textAbstract:
ITC/USA 2006 Conference Proceedings / The Forty-Second Annual International Telemetering Conference and Technical Exhibition / October 23-26, 2006 / Town and Country Resort & Convention Center, San Diego, California<br>The optimum detector for shaped offset QPSK (SOQPSK) is a trellis detector which has high complexity (as measured by the number of detection filters and trellis states) due to the memory inherent in this modulation. In this paper we exploit the cross-correlated, trellis-coded, quadrature modulation (XTCQM) representation of SOQPSK-TG to formulate a reduced complexity detector. We show that a factor of 128 reduction in the number of trellis states of the detector can be achieved with a loss of only 0.2 dB in bit error rate performance as compared to optimum at P(b) = 10^(-5).
11
Lei, Qiang, and Michael Rice. "Iterative Equalization for SOQPSK in Multipath Fading." International Foundation for Telemetering, 2008. http://hdl.handle.net/10150/606195.
Full textAbstract:
ITC/USA 2008 Conference Proceedings / The Forty-Fourth Annual International Telemetering Conference and Technical Exhibition / October 27-30, 2008 / Town and Country Resort & Convention Center, San Diego, California<br>This paper investigates the application of iterative equalization techniques to overcome multipath fading for shaped offset QPSK (SOQPSK) in aeronautical telemetry. Two iterative equalization techniques for turbo encoded SOQPSK are presented. The first is the optimal-MAP turbo equalizer for OQPSK. The second equalizer is the adaptive decision feedback equalizer. Simulation shows that in the presence of frequency selective multipath typically encountered in aeronautical telemetry, both of these equalizers exhibit impressive performance.
12
Hosseini, Ehsan. "Synchronization of SOQPSK-TG in Burst-Mode Transmissions." International Foundation for Telemetering, 2013. http://hdl.handle.net/10150/579650.
Full textAbstract:
ITC/USA 2013 Conference Proceedings / The Forty-Ninth Annual International Telemetering Conference and Technical Exhibition / October 21-24, 2013 / Bally's Hotel & Convention Center, Las Vegas, NV<br>In this paper, we present a maximum likelihood synchronization algorithm which jointly estimates frequency offset, symbol timing and carrier phase for shaped-offset quadrature phase-shift keying (SOQPSK) signals. We have considered a burst-mode transmission scenario in which a known training sequence is embedded in the beginning of each burst for the purpose of data-aided (DA) synchronization in a feedforward structure. The proposed algorithm first estimates the frequency offset independently from other parameters. The estimated frequency is then used to derive the symbol timing which is followed by the carrier phase estimation. The mean-squared error (MSE) of the proposed algorithm is computed via simulations. The results show that the proposed algorithm performs near the theoretical Cramér-Rao bound (CRB) at signal-to-noise ratios (SNRs) as low as 0 dB.
13
Xingwen, Ding, Zhai Wantao, Song Jianyong, and Chen Ming. "A Comparison of Coherent Detectors for SOQPSK-TG." International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596420.
Full textAbstract:
ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NV<br>SOQPSK-TG is a highly bandwidth-efficient constant-envelope modulation so that it has been applied in airspace telemetry widely. We compare four types of coherent detectors for SOQPSK-TG, which are optimal detector, pulse truncation (PT) detector, standard OQPSK detector and modified OQPSK detector. The simulation and analysis results indicate that PT detector has the advantages of low complexity and good performance, so it has more practicality value.
14
Bruns, Tom. "PERFORMANCE COMPARISON OF SOQPSK DETECTORS: COHERENT VS. NONCOHERENT." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604500.
Full textAbstract:
ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>Shaped Offset Quadrature Shift Keying (SOQPSK) is a spectrally efficient modulation that has been promoted in the airborne telemetry community as a more spectrally efficient alternative for legacy PCM/FM. First generation demodulators for SOQPSK use coherent detectors which achieve good bit error rates at the expense of long synchronization times. This paper examines the performance of a noncoherent SOQPSK detector which significantly improves the signal acquisition times without impacting BER performance in the AWGN environment. The two detection methods are also compared in their ability to combat other channel impairments, such as adjacent and on-channel interference.
15
Bishop, Chris, and Mike Fahey. "AN EXTENSION OF SOQPSK TO M-ARY SIGNALLING." International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/605808.
Full textAbstract:
International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>Shaped Offset Quadrature Phase Shift Keying (SOQPSK) has the advantages of low sidelobes and high detection probability; however, its main lobe has a fixed width set by the number of constellation points. By slightly modifying the modulation scheme, the four constellation points of quadrature shift keying can be changed to M constellation points where M is a power of 2. After this change, the power spectral density (PSD) retains low sidelobes, and the desirable property of being able to detect the signal by integrating over two symbol periods is retained.
16
Geoghegan, Mark. "BANDWIDTH AND POWER EFFICIENCY TRADE-OFFS OF SOQPSK." International Foundation for Telemetering, 2002. http://hdl.handle.net/10150/607537.
Full textAbstract:
International Telemetering Conference Proceedings / October 21, 2002 / Town & Country Hotel and Conference Center, San Diego, California<br>Shaped Offset QPSK (SOQPSK), as proposed and analyzed by Terrance Hill, is a family of constant envelope waveforms that is non-proprietary and exhibits excellent spectral containment and detection efficiency. Results for two variants, defined as SOQPSK-A and -B, have previously been presented. However, it remains to be seen whether or not even more attractive choices exist. This paper explores the bandwidth and power efficiency trade-offs of the entire SOQPSK family using computer simulations and analytical performance bounds.
17
Cole-Rhodes, Arlene, Henry Umuolo, Farzad Moazzami, and Michael Rice. "Real-Time CMA Equalization for SOQPSK for Aeronautical Telemetry." International Foundation for Telemetering, 2014. http://hdl.handle.net/10150/577419.
Full textAbstract:
ITC/USA 2014 Conference Proceedings / The Fiftieth Annual International Telemetering Conference and Technical Exhibition / October 20-23, 2014 / Town and Country Resort & Convention Center, San Diego, CA<br>This paper presents the results of using the constant modulus algorithm (CMA) to recover a shaped offset quadrature-phase shift keying (SOQPSK)-TG modulated signal, which has been transmitted over an aeronautical telemetry channel using the iNET data packet structure. The iNET-packet structure contains known data bits (the preamble and asynchronous marker (ASM) bits) within each data packet, which can be used to determine the minimum mean square error (MMSE) equalizer and is then used as an initializer for the CMA algorithm. A baseline analysis of the performance of the MMSE-initialized CMA equalizer has been previously done using average bit error rates (BER). In order to achieve realtime processing, in this implementation the CMA equalizer weights are updated using a new data packet for each adaptation of the equalizer during which the bit error analysis is being done. Two implementations of the block processing CMA are compared. The first achieves convergence of the equalizer in the startup phase by processing a single fixed packet and the second achieves convergence by processing the multiple packets of received data. Performance evaluation results based on bit error rates, are presented for these two methods and they are compared to a previously determined baseline performance. We note that with the proper choice of parameters these real-time methods can achieve the baseline performance.
18
Umuolo, Henry, Habtamu Betelle, and Solomon Thang. "Evaluation of Effect of CMA Radius on SOQPSK Equalization." International Foundation for Telemetering, 2014. http://hdl.handle.net/10150/577420.
Full textAbstract:
ITC/USA 2014 Conference Proceedings / The Fiftieth Annual International Telemetering Conference and Technical Exhibition / October 20-23, 2014 / Town and Country Resort & Convention Center, San Diego, CA<br>In this work we investigate the effect of using different values of the radius in a constant modulus algorithm (CMA) equalizer for shaped offset quadrature-phase shift keying (SOQPSK), which is transmitted using the iNET data packet structure. The iNET packet structure contains known data bits (the preamble and asynchronous marker (ASM) bits) within each data packet, and these are used to initialize a block processing CMA algorithm. Two real-time processing methods are investigated here, which are referred to as the 'Single block processing' and the 'Block-by-block processing' methods. Both processing methods require that a number of data packets be discarded while the CMA equalizer converges. In this work we will investigate the effect on the performance of the CMA equalizer of changing its equalizing radius, and also the effect of processing different numbers of data packets based on the same initialization. Based on the results of these tests, a final choice of parameters will be made and we will produce a bit error rate curve for a single telemetry channel.
19
Hill, Terry, and Jim Uetrecht. "SOQPSK with LDPC: Spending Bandwidth to Buy Link Margin." International Foundation for Telemetering, 2013. http://hdl.handle.net/10150/579588.
Full textAbstract:
ITC/USA 2013 Conference Proceedings / The Forty-Ninth Annual International Telemetering Conference and Technical Exhibition / October 21-24, 2013 / Bally's Hotel & Convention Center, Las Vegas, NV<br>Over the past decade, SOQPSK has been widely adopted by the flight test community, and the low density parity check (LDPC) codes are now in widespread use in many applications. This paper defines the waveform and presents the bit error rate (BER) performance of SOQPSK coupled with a rate 2/3 LDPC code. The scheme described here expands the transmission bandwidth by approximately 56% (which is still 22% less than the legacy PCM/FM modulation), for the benefit of improving link margin by over 10 dB at BER = 10⁻⁶.
20
McMurdie, Andrew Dennis. "Frame Synchronization Techniques for iNET-Formatted SOQPSK-TG Communications." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/4452.
Full textAbstract:
In this thesis, frame synchronization for iNET formatted SOQPSK-TG communications is considered. Frame synchronization for M-ary linear modulations (MQAM, MPSK, etc.) are known in the literature using pilot detection methods, but are based on a signal model that does not apply to SOQPSK-TG. Maximum likelihood frame synchronizers are derived for an SOQPSK-TG system following assumptions found in the literature. The analysis shows that a reinterpretation of known detectors operating on the samples of the received waveform and locally stored samples of the pilot is the optimum approach for this case. Simulation results for an AWGN channel and several multipath channels verify the performance of the synchronizers.
21
Wang, Enkuang D., and Timothy J. Brothers. "OFDM AND SOQPSK TRANSCEIVER HARDWARE IMPLEMENTATION WITH PRELIMINARY RESULTS." International Foundation for Telemetering, 2016. http://hdl.handle.net/10150/624249.
Full textAbstract:
This paper presents a hardware implementation of a transceiver capable of both orthogonal
frequency-division multiplexing (OFDM) and shaped-offset quadrature phase shift keying
(SOQPSK) transmissions using a dataflow programming language. Based on the physical layer
iNET standard, we introduce a transceiver implementation that utilizes both waveforms with low
density parity check (LDPC) forward error correction (FEC) codes. This testbed is intended to test
and enable an adaptive algorithm that uses both waveforms as its modulation schemes. As such, it
has the ability to dynamically select various modulation parameters and coding rates. The
hardware implementations are described and performance utilizations are presented.
22
Ramakrishnan, Madhusudhan. "Multiple Bit Differential Detection of SOQPSK with Diversity Reception." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604545.
Full textAbstract:
ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>In this paper, we consider multiple bit differential detection (MBDD) of differentially encoded shapedoffset quadrature phase-shift keying (SOQPSK) over slow fading channels, especially Rayleigh fading channels. SOQPSK is a highly bandwidth efficient and popular form of constant envelope continuous phase modulation (CPM). We present two versions of the MBDD algorithm: the full-size version (FMBDD) which uses a detection window that spans the entire N-bit observation window, and an improved version (I-MBDD) which maintains the original N-bit observation window but detects only N − 2 bits within the window. The complexity of both algorithms is shown to increase linearly with the order of diversity reception, L, and exponentially with the size of the observation window, N; the I-MBDD achieves the best performance for given values of L and N. As expected, the performance in the case of diversity reception shows a marked improvement over the single channel case.
23
Hosseini, Ehsan, and Gino Rea. "Hardware-Efficient Implementation of the SOVA for SOQPSK-TG." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/605932.
Full textAbstract:
ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, California<br>In this paper, we present a hardware-efficient architecture of a demodulator for shaped offset quadrature phase shift keying, telemetry group version (SOQPSK-TG). The demodulation is done using the soft-output Viterbi algorithm (SOVA), which is implemented by the two-step traceback method. In this method, two traceback operations are employed to find the maximum-likelihood (ML) path and the competing path. Using the proposed architecture, the tracebacks are done at the same time as the demodulator is generating output bits and their reliabilities. This method has been shown to require less storage than the well-known register-exchange method. Finally, we present the performance results from the FPGA implementation.
24
Gupte, Abhishek. "SOQPSK Signals in Multiple Input Multiple Output (MIMO) Systems." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/605954.
Full textAbstract:
ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, California<br>This paper investigates the use of shaped offset quadrature phase shift keying (SOQPSK) signals in multiple-input multiple-output (MIMO) communication systems. The goal is to integrate commonly used receiver architectures for conventional single-input single-output (SISO) systems into a corresponding MIMO system. The benefits of improved spectral efficiency are juxtaposed against the increased receiver complexity. Bit error rate performances for the SISO and MIMO architectures in a multipath environment are compared and conclusions regarding trade-offs between signal to noise ratio (SNR) and spectral efficiency stated.
25
Alam, Daniel. "Coded SOQPSK-TG Using the Soft Output Viterbi Algorithm." International Foundation for Telemetering, 2009. http://hdl.handle.net/10150/606121.
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ITC/USA 2009 Conference Proceedings / The Forty-Fifth Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2009 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>In this paper we present a system-level description of a serially concatenated convolutional coding scheme for shaped offset quadrature phase shift keying, telemetry group (SOQPSK-TG). Our paper describes the operation of various system modules. In addition, implementation details and references for each module in the system are provided. The modified Soft Output Viterbi Algorithm (SOVA) is employed for decoding inner and outer convolutional codes. The modified SOVA possess strong performance and low-complexity cost. The comparison of the modified (SOVA) and Max-Log-maximum a posteriori (MAP) decoding algorithm is presented. The SOVA after a simple modification displays the same performance as Max-Log-MAP algorithm, which is demonstrated by the simulation results. The advantage of the simple implementation of the modified SOVA makes it superior to Max-Log-MAP for our purposes.
26
Geoghegan, Mark. "IMPLEMENTATION AND PERFORMANCE RESULTS FOR TRELLIS DETECTION OF SOQPSK." International Foundation for Telemetering, 2001. http://hdl.handle.net/10150/607607.
Full textAbstract:
International Telemetering Conference Proceedings / October 22-25, 2001 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>Shaped Offset QPSK (SOQPSK), as proposed and analyzed by Terrance Hill, is a family of constant envelope waveforms that is non-proprietary and exhibits excellent spectral containment and detection efficiency. Results using a conventional coherent OQPSK demodulator without any special pulse shaping to recover the SOQPSK signal have been previously presented. This paper describes a trellis detector for SOQPSK-A and SOQPSK-B that provides superior detection performance, as compared to a traditional OQPSK detector, by accounting for the pulse shaping. Analytical error performance bounds, implementation of the trellis demodulator, and computer simulation results are presented.
27
Xingwen, Ding, Song Jianyong, Chen Ming, and Lu Manhong. "A Modified OQPSK Detection for SOQPSK-TG in Aeronautical Telemetry." International Foundation for Telemetering, 2014. http://hdl.handle.net/10150/577448.
Full textAbstract:
ITC/USA 2014 Conference Proceedings / The Fiftieth Annual International Telemetering Conference and Technical Exhibition / October 20-23, 2014 / Town and Country Resort & Convention Center, San Diego, CA<br>SOQPSK-TG is a highly bandwidth-efficient constant-envelope modulation so that it has been applied in aeronautical telemetry widely. We develop a simple detection of SOQPSK-TG which is based on a modified OQPSK detection. The simple detection has the advantages of low complexity and good performance. And it's also suitable for other varieties of SOQPSK and FQPSK.
28
Sahin, Cenk. "The Performance of Simple Receivers for MIMO SOQPSK-TG Systems." International Foundation for Telemetering, 2011. http://hdl.handle.net/10150/595805.
Full textAbstract:
ITC/USA 2011 Conference Proceedings / The Forty-Seventh Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2011 / Bally's Las Vegas, Las Vegas, Nevada<br>We investigate the performance of reduced complexity receivers for aeronautical telemetry shaped-offset quadrature phase shift-keying (SOQPSK-TG) in multiple-input multiple-output (MIMO) channels. We use spatial multiplexing (SM) to achieve the highest throughput possible. Two types of channel equalization methods are considered to separate the substreams sent by independent antennas. The first method employs linear equalizers, including minimum mean-squared error (MMSE) and zero-forcing (ZF), to nullify the intersymbol interference (ISI) introduced by the MIMO channel in a single step. The second method, vertical Bell Labs layered space time (V-BLAST) architecture, removes the ISI iteratively by the use of decision feedback (DE). The channel equalizer is followed by a suboptimal SOQPSK-TG detector. The performance of various equalizer/detector pairs are presented. The results show that computationally efficient MIMO SOQPSK-TG architectures achieve excellent bit error rate (BER) performance while transmitting at high data rates.
29
Kannappa, Sandeep Mavuduru. "Reduced Complexity Viterbi Decoders for SOQPSK Signals over Multipath Channels." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/604300.
Full textAbstract:
ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, California<br>High data rate communication between airborne vehicles and ground stations over the bandwidth constrained Aeronautical Telemetry channel is attributed to the development of bandwidth efficient Advanced Range Telemetry (ARTM) waveforms. This communication takes place over a multipath channel consisting of two components - a line of sight and one or more ground reflected paths which result in frequency selective fading. We concentrate on the ARTM SOQPSKTG transmit waveform suite and decode information bits using the reduced complexity Viterbi algorithm. Two different methodologies are proposed to implement reduced complexity Viterbi decoders in multipath channels. The first method jointly equalizes the channel and decodes the information bits using the reduced complexity Viterbi algorithm while the second method utilizes the minimum mean square error equalizer prior to applying the Viterbi decoder. An extensive numerical study is performed in comparing the performance of the above methodologies. We also demonstrate the performance gain offered by our reduced complexity Viterbi decoders over the existing linear receiver. In the numerical study, both perfect and estimated channel state information are considered.
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Nelson, Tom. "SPACE-TIME CODED SOQPSK IN THE PRESENCE OF DIFFERENTIAL DELAYS." International Foundation for Telemetering, 2004. http://hdl.handle.net/10150/605785.
Full textAbstract:
International Telemetering Conference Proceedings / October 18-21, 2004 / Town & Country Resort, San Diego, California<br>This paper presents a method of detecting the Tier I modulation SOQPSK when it is used in a space-time coded (STC) system in which there is a non-negligible differential delay between the received signals. Space-time codes are useful to eliminate data dropouts which occur on aeronautical telemetry channels in which transmit diversity is employed. The proposed detection algorithm employs a trellis to detect the data while accounting for the offset between the in-phase and quadrature-phase components of the signals as well as the differential delay. The performance of the system is simulated and presented and it is shown that the STC eliminates the BER floor which results from the data dropouts.
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Erkmen, Baris I., Andre Tkacenko, and Clayton M. Okino. "Preamble Design for Symbol Timing Estimation from SOQPSK-TG Waveforms." International Foundation for Telemetering, 2009. http://hdl.handle.net/10150/606119.
Full textAbstract:
ITC/USA 2009 Conference Proceedings / The Forty-Fifth Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2009 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>Data-aided symbol synchronization for bursty communications utilizes a predetermined modulation sequence, i.e., a preamble, preceding the payload. For effective symbol synchronization, this preamble must be designed in accordance with the modulation format. In this paper, we analyze preambles for shaped offset quadrature phase-shift keying (SOQPSK) waveforms. We compare the performance of several preambles by deriving the Cram´er-Rao bound (CRB), and identify a desirable one for the Telemetry Group variant of SOQPSK. We also demonstrate, via simulation, that the maximum likelihood estimator with this preamble approaches the CRB at moderate signal-to-noise ratio.
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Rice, Michael, Md Shah Afran, Mohammad Saquib, Arlene Cole-Rhodes, and Farzad Moazzami. "A Comparison of Three Equalization Techniques for iNET-formatted SOQPSK-TG." International Foundation for Telemetering, 2014. http://hdl.handle.net/10150/577463.
Full textAbstract:
ITC/USA 2014 Conference Proceedings / The Fiftieth Annual International Telemetering Conference and Technical Exhibition / October 20-23, 2014 / Town and Country Resort & Convention Center, San Diego, CA<br>This paper demonstrates the effectiveness of the zero-forcing, minimum mean-squared error, and constant-modulus equalizers in improving the BER performance of iNET-formatted SOQPSK-TG. The equalization algorithms leverage the existence of known bit sequences in the preamble and ASM fields of the iNET packet to realize data-aided equalizers. The effectiveness of these equalization techniques over ten test channels, derived from channel sounding experiments at Edwards AFB, was evaluated. The BER curves for nine out of the ten test channels display the desirable "waterfall" shape. The BER curve for the remaining test channel displays a "BER floor." Fortunately, the "BER floor" is low enough to allow error correcting codes, such as the iNET LDPC code, to correct the errors and provide virtually error-free performance.
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KoneDossongui, Serge, Oladotun Opasina, Henry Umuolo, Habtamu Betelle, Solomon Thang, and Robin Shrestha. "Evaluation of CMA+AMA Equalization for SOQPSK Modulation in Aeronautical Telemetry." International Foundation for Telemetering, 2013. http://hdl.handle.net/10150/579587.
Full textAbstract:
ITC/USA 2013 Conference Proceedings / The Forty-Ninth Annual International Telemetering Conference and Technical Exhibition / October 21-24, 2013 / Bally's Hotel & Convention Center, Las Vegas, NV<br>Multipath interference continues to be the dominant cause of telemetry link outages in low-elevation angle reception scenarios. The most reliable and universally applicable solution to this problem is in the form of equalization. Previous work in this area has considered the Constant modulus algorithm (CMA) equalizer operating in a blind adaptive mode. To the extent that knowledge of the multipath channel improves the performance of CMA and related equalizers and permits the use of other equalization techniques, data aided equalizers are of interest. Channel knowledge is obtained by comparing the received samples with the samples corresponding to a known bit pattern (called a pilot block) periodically inserted in the telemetry data stream. The main objective of this research is to evaluate the performance of a modified CMA equalization algorithm, which has the property of automatically resolving the phase of the QPSK modulated symbol, and to determine its suitability for use with SOQPSK-TG by taking into account the capability of exploiting the presence of a periodically inserted pilot block. As an initial effort in that direction, this paper provides simulation results of the error performance of the blind linear combination of CMA and alphabet matched algorithm (AMA) equalizer as compared to that of pilot assisted equalization with SOQPSK modulation over aeronautical channel.
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Jensen, Michael A., Michael D. Rice, Thomas Nelson, and Adam L. Anderson. "ORTHOGONAL DUAL-ANTENNA TRANSMIT DIVERSITY FOR SOQPSK IN AERONAUTICAL TELEMETRY CHANNELS." International Foundation for Telemetering, 2004. http://hdl.handle.net/10150/605320.
Full textAbstract:
International Telemetering Conference Proceedings / October 18-21, 2004 / Town & Country Resort, San Diego, California<br>Transmit diversity schemes such as the Alamouti space-time code have been shown to be
viable candidates to enable robust dual-antenna transmission from maneuvering air vehicles. However, due to the complicated structure of shaped offset quadrature phase shift
keying (SOQPSK) modulation, the Alamouti approach has not been applicable to SOQPSK
systems. This paper develops a precoding and detection algorithm which allows implementation of dual-antenna Alamouti signaling for SOQPSK modulation. Performance simulations
demonstrate the performance of the scheme for a realistic flight scenario.
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Counsil, David T., and Ratish J. Punnoose. "Improved Error Performance in SOQPSK Modulation Using a Ternary Symbol Encoder." International Foundation for Telemetering, 2009. http://hdl.handle.net/10150/606148.
Full textAbstract:
ITC/USA 2009 Conference Proceedings / The Forty-Fifth Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2009 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>Telemetry transmissions have been evolving over the recent years from PCM/FM to other constant envelope modulation schemes such as SOQPSK and multi-h CPM. These newer modulations schemes have better spectral efficiency but tend to have worse error performance than optimally detected PCM/FM. We present a new ternary symbol encoder to replace the existing differential encoder and pre-coder for SOQPSK. This improves error performance while minimally affecting the spectral properties. The "reach" of the new ternary code length is not much longer than current symbol encoder, so there will not be a significant increase in synchronization time in the receiver. We provide simulation results showing the increased performance. Along the way, we also provide a simplified view of the current SOQPSK differential encoder and pre-coder.
36
Perrins, Erik. "Incompatibility of Trellis-Based Noncoherent SOQPSK Demodulators for Use in FEC Applications." International Foundation for Telemetering, 2012. http://hdl.handle.net/10150/581750.
Full textAbstract:
ITC/USA 2012 Conference Proceedings / The Forty-Eighth Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2012 / Town and Country Resort & Convention Center, San Diego, California
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O'Cull, Douglas C. "The Effects of Phase Noise on Trellis FM & SOQPSK Data Links." International Foundation for Telemetering, 2011. http://hdl.handle.net/10150/595625.
Full textAbstract:
ITC/USA 2011 Conference Proceedings / The Forty-Seventh Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2011 / Bally's Las Vegas, Las Vegas, Nevada<br>Current IRIG standards provide guidelines for system phase noise and several manufactures provide receivers and transmitters that perform within this standard. However, legacy receivers and transmitters that do not meet the current IRIG standards are sometimes still used during a mission. This paper will address how phase noise outside of the current IRIG standard affects the performance of an FM data link when using a trellis demodulator, as well as the performance of an SOQPSK data link in a high phase noise environment. Bit error rate performance and test results at several different rates with various phase noise masks are presented in this paper.
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Wang, Enkuang D., Timothy J. Brothers, and Richard T. Causey. "LINK QUALITY METRICS FOR ADAPTIVE CODING AND MODULATION WITH SOQPSK AND OFDM." International Foundation for Telemetering, 2017. http://hdl.handle.net/10150/627014.
Full textAbstract:
In previous work, we presented a link quality metric for adaptive modulation and coding of two standard telemetry waveforms, orthogonal frequency-division multiplexing (OFDM) and shaped-offset quadrature phase shift keying (SOQPSK). That metric unified error vector magnitude (EVM) and Godard dispersion, for OFDM and SOQPSK, respectively, in the contexts of additive white Gaussian noise (AWGN) channels. In this paper, we present an alternative metric based on low density parity check (LDPC) decoding iterations. We show this new metric to be an equally effective substitute for AWGN channels but also to be applicable to a wider variety of channels, including those with multipath and interference. Furthermore, we show the metric to be robust within sub-optimal, lower complexity receiver architectures.
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Dossongui, Itie Serge Kone, and Peter Taiwo. "CMA Equalization of Measured SOQPSK-TG Data Transmitted Using iNET Packet Structure." International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596400.
Full textAbstract:
ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NV<br>In this work we consider the problem of recovering shaped offset quadrature-phase shift keying (SOQPSK)-TG modulated data, which has been transmitted over an unknown channel, using the iNET data packet structure. Previous work has shown the effectiveness of a block processing CMA equalizer which uses the known data bits contained in the iNET packet structure (i.e. the preamble and ASM bits) to provide an alternative method of initialization. In this research we apply a CMA equalizer, which has been initialized by the minimum mean square error (MMSE) equalizer to measure data that was transmitted using the iNET packet structure in a laboratory experiment. Since the CMA equalizer does not determine the correct phase shift for each data packet, the known data bits contained in each iNET packet will be used to determine the phase correction. The total number of bit errors will be used as a basis to evaluate the performance of our MMSE-initialized CMA equalizer for this experimental data.
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Syed, Afzal. "COMPARISON OF NONCOHERENT DETECTORS FOR SOQPSK AND GMSK IN PHASE NOISE CHANNELS." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604544.
Full textAbstract:
ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>SOQPSK and GMSK are highly bandwidth efficient continuous phase modulation (CPM) schemes with several desirable qualities. In both cases, coherent detectors are available with good performance in AWGN. In this paper, we develop reduced complexity noncoherent detectors for SOQPSK and GMSK; and discuss a phase noise model. This is followed by a performance comparison of both the noncoherent detectors in channels with phase noise.
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Rea, Gino. "A System-Level Description of a SOQPSK-TG Demodulator for FEC Applications." International Foundation for Telemetering, 2009. http://hdl.handle.net/10150/606131.
Full textAbstract:
ITC/USA 2009 Conference Proceedings / The Forty-Fifth Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2009 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>In this paper we present a system-level description of a demodulator for shaped offset quadrature phase shift keying, telemetry group version (SOQPSK-TG) for use in forward error correction (FEC) applications. We describe the system in block-diagram form and provide implementation details for data sequence detection, symbol timing synchronization, carrier phase synchronization, and block recovery. This decision-directed demodulator is based on maximum likelihood principles, and is efficiently implemented by the soft output Viterbi algorithm (SOVA). We also provide results of the demodulator's performance in the additive white Gaussian noise channel, based on the observed bit error rate at different signal-to-noise ratio levels.
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Law, Eugene. "RECOMMENDED MINIMUM TELEMETRY FREQUENCY SPACING WITH CPFSK, CPM, SOQPSK, AND FQPSK SIGNALS." International Foundation for Telemetering, 2003. http://hdl.handle.net/10150/606726.
Full textAbstract:
International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>This paper will present equations for calculating the minimum recommended frequency separation of two digital telemetry signals. The signals can be filtered continuous phase frequency shift keying (CPFSK), multi-h continuous phase modulation (CPM) [1], shaped offset quadrature phase shift keying-Telemetry Group (SOQPSK-TG, aka SOQPSK-A*) [2], or Feher’s patented quadrature phase shift keying FQPSK-B (or FQPSK-JR [3]). The equations are based on measured data in an adjacent channel interference (ACI) environment for filtered CPFSK (aka PCM/FM), multi-h CPM (or CPM for short), SOQPSK-TG, FQPSK-JR, and FQPSK-B. This paper is an extension of my 2001 and 2002 International Telemetering Conference papers on this topic [4, 5]. The quantity measured was bit error probability (BEP) versus frequency separation at a given signal energy per bit to noise power spectral density ratio (Eb/No). The interferers were CPFSK, CPM, SOQPSK-TG or FQPSK-B (-JR) signals. The results presented in this paper will be for a desired signal bit rate of 1 to 20 Mb/s, one interferer 20 dB larger than the desired signal (a few tests included two interferers), and various center frequency spacings, interfering signals, receivers, and demodulators. The overall ACI test effort has collected data sets at several bit rates and with one and two interferers. The results will be useful to system designers and range operators as they attempt to maximize the number of Mb/s that can be simultaneously transmitted with minimal interference in the telemetry bands.
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Bozarth, Don, and Greg Horcher. "BENEFITS AND TECHNIQUES FOR INCREASED POWER EFFICIENCY IN MODERN TELEMETRY TRANSMITTERS." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604585.
Full textAbstract:
ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>With recent developments in telemetry transmitter technologies, significantly greater DC to RF
power efficiencies can be achieved. These new high efficiency transmitter designs may impact
overall system design trade-offs by reducing the system size and weight requirements for
batteries, heat sinks, and cabling. Furthermore, these fully DC isolated, next generation ARTM
Tier 0, I and II enabled devices offer unique options to the platform designer in EMI/EMC
control and system design. Advanced manufacturing techniques coupled with adaptive
microprocessor control promises enhanced functionality, improved performance and reduced
unit costs.
The paper presents the performance of a new, high efficiency, telemetry transmitter topology and
the possible system benefits involved with the application of this advanced transmitter
technology within modern and legacy telemetry platforms. Specific sub-assembly circuit design
techniques will be discussed and compared with prior design approaches.
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Dang, Xiaoyu. "Performance Analysis of FQPSK and SOQPSK in Aeronautical Telemetry Frequency Selective Multipath Channel." International Foundation for Telemetering, 2004. http://hdl.handle.net/10150/605801.
Full textAbstract:
International Telemetering Conference Proceedings / October 18-21, 2004 / Town & Country Resort, San Diego, California<br>The impact of frequency selective multipath fading on the bit error rate performance of ARTM Tier-1 waveforms (FQPSK and SOQPSK) is derived and analyzed. In the presence of a strong specular reflection with relative magnitude |Γ1|, the ARTM Tier-1 waveforms suffer a loss in performance of (1 - |Γ1)^(-4√(|Γ1|)) for |Γ1| < 0:5 and a relatively high error floor at approximately 10^(-2) for |Γ1| ≥ 0.5. The ARTM Tier-1 waveforms possess twice the spectral efficiency of PCM/FM, but exhibit a greater loss and higher error floors than PCM/FM for the same multipath conditions and signal-to-noise ratio.
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Wegener, John A., and Michael C. Roche. "THE DESIGN OF A 21st CENTURY TELEMTRY SYSTEM WITH SOQPSK MODULATION AND INTEGRATED CONTROL." International Foundation for Telemetering, 2005. http://hdl.handle.net/10150/604875.
Full textAbstract:
ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>This paper describes a telemetry system developed for the EA-18G Flight Test program. The
program requires transmission of a number of data streams, in IRIG-106 Chapter 4 PCM, Chapter 8
Mux-All 1553, Ethernet, and Fibre Channel formats. The initial requested data rate was in excess of
30 Mbits/sec. The telemetry system must operate at a range up to about 120 miles, at several test
ranges, and with several different aircraft maneuvering configurations. To achieve these
requirements, the Flight Test Instrumentation group at Boeing Integrated Defense Systems in Saint
Louis, developed a telemetry system in conjunction with industry partners and test range customers.
The system transmits two telemetry streams with a total aggregate rate on the order of 20 Mbits/sec.
Each telemetry stream consists of up to four PCM streams, combined in a Teletronics Technology
Corporation (TTC) Miniature Adaptable Real-Time Multiplexer Unit (MARM) data combiner. It
uses Nova Engineering multi-mode transmitters capable of transmitting PCM-FM or Shaped Offset
Quadrature Phase Shift Keying (SOQPSK). The transmitter also provides Turbo-Product Code
(TPC) Forward Error Correction (FEC) to enhance range and improve link performance. Data
collection units purchased from outside vendors or developed by Saint Louis Flight Test
Instrumentation, translate Ethernet and Fibre Channel information into traditional PCM streams. A
Boeing Flight Test Instrumentation developed control system provides flexible selection of streams
to be combined into each telemetry stream, and functional control of antenna selection and
transmitter operation.
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Hill, Terrance J. "ANALYTICAL AND EXPERIMENTAL CHARACTERIZATION OF SOQPSK AND MULTI-H CPM IN A MULTIPATH CHANNEL." International Foundation for Telemetering, 2001. http://hdl.handle.net/10150/606446.
Full textAbstract:
International Telemetering Conference Proceedings / October 22-25, 2001 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>Shaped Offset QPSK (SOQPSK) has been shown to be nearly identical in performance to Feher-patented
FQPSK, which is the Advanced Range Telemetry (ATRM) program's Tier I waveform.
Multi-h CPM has been selected as the ARTM Tier II waveform, because it offers 50% better spectral
efficiency than the Tier I waveform. Both the Tier I and Tier II waveforms must operate in a
multipath channel in order to meet the range community's telemetry requirements. This paper
presents an analytical and experimental characterization of SOQPSK and Multi-h CPM in the
presence of multipath. Quantitative results are presented which demonstrate the relative robustness
of the ARTM Tier I and Tier II waveforms, in channels representative of a typical range
environment.
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Hill, Terrance J. "PERFORMANCE OF SOQPSK AND MULTI-H CPM IN THE PRESENCE OF ADJACENT CHANNEL INTERFERENCE." International Foundation for Telemetering, 2001. http://hdl.handle.net/10150/606448.
Full textAbstract:
International Telemetering Conference Proceedings / October 22-25, 2001 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>Multi-h CPM has been selected as the Tier II waveform for the Advanced Range Telemetry (ARTM)
program, because it offers 50% better spectral efficiency than Feher-patented FQPSK, which is the
Tier I waveform. Shaped Offset QPSK has been shown to be nearly identical in performance to
Feher-patented FQPSK. Both the Tier I and Tier II waveforms must operate in the presence of
adjacent channel interference in order to meet the range community's telemetry requirements. This
paper presents an experimental characterization of SOQPSK and Multi-h CPM in the presence of
adjacent channel interference, over a range of channel spacings and differential signal amplitudes.
Quantitative results are presented which demonstrate the relative robustness of the ARTM Tier I and
Tier II waveforms, with adjacent channel interference representative of a typical range environment.
48
Hill, Terrance J. "AN ENHANCED, CONSTANT ENVELOPE, INTEROPERABLE SHAPED OFFSET QPSK (SOQPSK) WAVEFORM FOR IMPROVED SPECTRAL EFFICIENCY." International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/606498.
Full textAbstract:
International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California<br>Shaped BPSK (SBPSK) and Shaped Offset QPSK (SOQPSK), as defined in various MIL standards, are
widely employed on SATCOM links because they offer an attractive combination of good spectral
efficiency, constant envelope characteristics, and interoperability with legacy equipments. More
recently, numerous terrestrial applications of OQPSK and similar waveforms (Feher-patented FQPSK)
have been proposed. The present paper describes a simple non-proprietary modification of the MIL-STD
SOQPSK waveform which offers spectral containment and detection efficiency comparable to or better
than FQPSK-B (Revision A1), while preserving a constant envelope characteristic and backward
compatibility with existing equipment.
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Berard, Alfredo, Paul Cook, and John Roach. "The Performance Evaluation of an OFDM-Based IP Transceiver at Eglin AFB." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/604286.
Full textAbstract:
ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, California<br>The 46th Test Wing, 846th Test Support Squadron (846 TSS/TSI) at Eglin AFB is currently evaluating their airspace for the use of SOQPSK transmitters and receivers for telemetry. The Squadron will incorporate an IP-compatible OFDM transceiver from Teletronics Technology Corporation (TTC) that will provide a two-way communication channel for controlling configuration settings of the airborne SOQPSK transmitter and receiver. This provides an opportunity to evaluate the effectiveness of an airborne network instrumentation system and measure some critical parameters, with an opportunity to assess the performance and reliability of streaming telemetry and OFDM-based IP communication systems. This paper describes the experimental test setup created for this evaluation and summarizes the measurement and evaluation process.
50
Franz, Russell. "HIGH-RATE WIRELESS AIRBORNE NETWORK DEMONSTRATION (HiWAND) FLIGHT TEST RESULTS." International Foundation for Telemetering, 2007. http://hdl.handle.net/10150/604590.
Full textAbstract:
ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>An increasing number of flight research and airborne science experiments now contain network-ready
systems that could benefit from a high-rate bidirectional air-to-ground network link. A
prototype system, the High-Rate Wireless Airborne Network Demonstration, was developed
from commercial off-the-shelf components while leveraging the existing telemetry infrastructure
on the Western Aeronautical Test Range. This approach resulted in a cost-effective, long-range,
line-of-sight network link over the S and the L frequency bands using both frequency modulation
and shaped-offset quadrature phase-shift keying modulation. This paper discusses system
configuration and the flight test results.