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Journal articles on the topic 'OQPSK'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 June 2025

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1

Stanley, Alphyn, and R. K. Sharma. "Very Large Scale Integrated-Circuit Architecture for Offset Quadrature Phase Shift Keying Modulation Using Offset Generator." Sensor Letters 17, no. 11 (2019): 884–87. http://dx.doi.org/10.1166/sl.2019.4142.

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This work presents an architecture for Offset Quadrature Phase Shift Keying (OQPSK) using an Offset generator. The Offset generator generates symbol patterns such that there is a maximum phase shift of ±90° only between the symbols, unlike the Quadrature Phase Shift Keying (QPSK) modulator which has a maximum of ±180° phase shift. Here the effort of designing an Offset generator, which can be embedded onto QPSK modulator to generate OQPSK with minimum combinational logic, has been discussed. Whenever the input symbols to the Offset generator varies in phase with a ±180° in constellation, it generates an intermediate symbol which differs only in ±90° with the previous one. Then it continues to give out the original symbol to be transmitted. This follows the exact OQPSK technology while it doesn't follow the conventional generation method of OQPSK modulation which provides an offset between the even and odd bit patterns of the symbols to be transmitted. The architecture is modelled using Verilog HDL and the functionality is validated from the simulation result.
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2

Zhou, Xiao, Chengyou Wang, and Ruiguang Tang. "Channel Estimation Based on IOTA Filter in OFDM/OQPSK and OFDM/OQAM Systems." Applied Sciences 9, no. 7 (2019): 1454. http://dx.doi.org/10.3390/app9071454.

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In this paper, we present a study of bit error rate (BER) for orthogonal frequency division multiplexing/offset quadrature phase shift keying (OFDM/OQPSK) and OFDM/offset quadrature amplitude modulation (OQAM) systems with an isotropic orthogonal transfer algorithm (IOTA) filter. The novel noise suppression method based on an IOTA filter is proposed to reduce the error of channel estimation caused by additive white Gaussian noise (AWGN). The OFDM/OQPSK and OFDM/OQAM systems do not insert the guard interval (GI) and pilots in the signal frames, thus they possess transmission efficiency. An analysis was carried out for convolutional coded OFDM/OQPSK and OFDM/OQAM systems in Rayleigh fading channels with generator polynomials and constraint lengths. Compared with conventional OFDM/QPSK and OFDM/QAM systems with the insertion of comb-type pilots, the proposed IOTA filter-based channel estimation method can provide significant energy per bit to time-varying noise power spectral density ratio gains over time and frequency-selective propagation Rayleigh fading channels in OFDM/OQPSK and OFDM/OQAM systems.
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3

Kumari, Pooja, Khaparkar Shailesh, and Sahu Pankaj. "Implementation of MSK Modulation Scheme for Zigbee System IEEE 802.15.4 Physical Layer." International Journal of Trend in Scientific Research and Development 2, no. 4 (2019): 2510–15. https://doi.org/10.31142/ijtsrd14609.

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In this work physical layer simulation of IEEE 802.15.4 ZigBee protocol has been done. The proposed work is the implementation of ZigBee system according to the protocol description. In this work we have simulated ZigBee system first with conventional OQPSK modulation technique, then the simulations are performed for MSK modulation, which is through OQPSK modulation. Simulation results for BER showing the average 79.43 improvement in BER for Proposed MSK compared with OQPSK modulation scheme. For a target BER of 10 2 the SNR required is 4 dB for this work i.e. for MSK, as compared to 10 dB for conventional OQPSK. Hence, an improvement of 6 dB less SNR. For a target BER of 10 2 the SNR required is 4 dB for this work i.e. for MSK, as compared to 5.2 dB with 1 . Hence, an improvement of 1.2 dB less SNR. Kumari Pooja | Shailesh Khaparkar | Pankaj Sahu "Implementation of MSK Modulation Scheme for Zigbee System / IEEE 802.15.4 Physical Layer" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-4 , June 2018, URL: https://www.ijtsrd.com/papers/ijtsrd14609.pdf
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4

Du, Qiao Ling, Zhi Rui Wang, Yu Pei, and Yi Ding Wang. "Performance Analysis of OQPSK Signals with Bi-Kappa Noise for Wireless Sensor Networks." Applied Mechanics and Materials 330 (June 2013): 957–60. http://dx.doi.org/10.4028/www.scientific.net/amm.330.957.

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This paper investigates the performance analysis of OQPSK in HF band for wireless sensor networks. An analytical model for getting symbol error rate (SER) is given in presence of Bi-Kappa noise in HF band. And the SER of OQPSK is given in AWGN and Rayleigh fading channel. Simulation results HF noise as Bi-Kappa noise should be investigated in HF band for WSN.
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5

Nugroho, Prapto. "Design of a 20 Mbps OQPSK Modulator Based on Multiplexers." JURNAL INFOTEL 16, no. 4 (2024): 855–70. https://doi.org/10.20895/infotel.v16i4.1237.

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This paper aims to delve into the design and implementation aspects of an OQPSK (Offset Quadrature Phase Shift Keying) modulator within the context of modem technology, underscoring its pivotal role in contemporary information technology infrastructure. The research primarily focuses on elucidating the theoretical foundations of OQPSK modulation, which represents an enhancement of QPSK modulation techniques. Central to the design is the utilization of a multiplexer to select one carrier signal out of four, which is subsequently modulated by data bits. Furthermore, the modulator employs two square wave signals phased 90 degrees apart, which are transformed into differential sinusoidal signals to constitute the carrier signal. Operating frequencies encompass a 5 MHz streaming data bits frequency and a 10 MHz clock frequency. Simulation results validate the efficacy of the OQPSK modulator by demonstrating its capability to generate modulated signals at a robust data transfer rate of 20 Mbps. This underscores the modulator's effectiveness in transmitting digital data over analog communication channels. In conclusion, the designed OQPSK modulator exemplifies its proficiency in efficiently modulating and demodulating signals, thereby bolstering connectivity and communication across diverse societal sectors. This research contributes significantly to the advancement of modem technology, which is indispensable for the expansion and maintenance of modern communication networks, ensuring robust connectivity in the digital age.
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6

Parkash, Sooraj, Amita Banga, and Dinesh Kumar. "PERFORMANCE ENHANCEMENT OF DWDMFSO SYSTEM UNDER DIVERSE WEATHER CONDITIONS WITH OPTIMIZED MODULATION FORMAT." International Journal of Engineering Applied Sciences and Technology 7, no. 9 (2023): 147–55. http://dx.doi.org/10.33564/ijeast.2023.v07i09.022.

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This paper is successfully demonstrating simulating comparison and investigation of 48 channels of dense wavelength division multiplexing free space optical (DWDM−FSO) network with a 10 GB/s data rate on each channel separated by 100 GHz frequency spacing under a clear sky, haze and light rain climate conditions. Apart from this, comparison of a series of modulation formats such as non−return to zero (NRZ), return to zero (RZ), carrier suppressed return to zero (CSRZ), Soliton pulse, and offset quadrature phase shift keying (OQPSK) have been performed and optimized the performance of the designed system with best suited modulated system. The performance of the proposed work has been evaluated in terms of bit error rate (BER), quality factor (Q), signal−to−noise ratio (SNR), received signal power and eye diagrams. It has been observed that OQPSK modulated system has shown more robust performance as compared to other line encoding techniques. The minimum simulation work reports for OQPSK modulated system have been recorded with the acceptable performance BER ≤ 10−10, Q ≥ 6 dB at the 2000 meters FSO link range.
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7

Li, Zhong Wei, and Rui He Wang. "Comparative Analysis on OQPSK and QDPSK of Continuous Pressure Wave System in Drilling Fluid Channel." Applied Mechanics and Materials 130-134 (October 2011): 3607–15. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.3607.

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Based on the urgent needs for high transmission speed and high reliability of wireless MWD, the OQPSK modulation of the drilling fluid continuous wave signal is proposed in this article. The Principle of delay orthogonal modulation and coherent demodulation of OQPSK are studied, and the changes in the phase vector of the inputted bit sequence are analyzed; according to the principle of continuous wave generation, the phase adjustment mechanism of rotary value are analyzed and the relationship between the signal waveform, as well as the rotational speed when adjusting the phase, is studied; the information transmission rate, band efficiency and bit error rate of the OQPSK and QDPSK continuous wave communication systems are comparatively analyzed and simulated. The results show that OQPSK eliminates the phase transition of π, which belongs to constant envelope modulation, is suitable for the transmission under low SNR drilling fluid channel, meanwhile simplifies the phase adjustment and reduces generator design. QDPSK can simplify the computational complexity of phase adjustment, and reduces the design difficulty of the continuous-wave generator’s control circuit. The rotary valve forms of "slow down - speed up" and " speed up - slow down " are suitable for π / 2 and 3π / 2 phase jump respectively; the motor control modes which combine closed loop position and closed loop velocity can achieve phase stable signal and reduce the dynamic torque of the motor; in the same carrier frequency and SNR, the information rate and bandwidth efficiency of both OQPSK’s and QDPSK’s are twice as those of the two-phase shift keying system’s, and they can improve the wireless transmission performance of MWD system.
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8

Raphaeli, Dan. "A Reduced Complexity Equalizer for OQPSK." IEEE Transactions on Communications 58, no. 1 (2010): 46–51. http://dx.doi.org/10.1109/tcomm.2010.01.0801922.

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9

Alatwi, Aadel M., and Ahmed Nabih Zaki Rashed. "Hybrid CPFSK/OQPSK modulation transmission techniques' performance efficiency with RZ line coding based fiber systems in passive optical networks." Indonesian Journal of Electrical Engineering and Computer Science 21, no. 1 (2021): 263–70. https://doi.org/10.11591/ijeecs.v21.i1.pp263-270.

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This study shows hybrid continuous-phase frequency shift keying (CPFSK)/optical quadrature-phase shift keying (OQPSK) modulation transmission techniques’ performance efficiency with return-to-zero (RZ) line coding scheme based fiber systems in passive optical networks. Max. Q factor/min. bit error rate variations versus modulation frequency and fiber length are studied in detail for various bits/symbol, based on hybrid proposed modulation transmission techniques. Also, optical power and received electrical power variations are simulated with fiber-length variations at a specified modulation frequency of 300GHz. Max. Q Factor, min. BER, max. signal power, and min. noise power variations are based on hybrid modulation techniques for CPFSK/OQPSK of 32 bits/symbol and a modulation frequency of 500GHz through a fiber length of 30km.
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10

Al- Azzawi, Fatima faydhe, Faeza Abas Abid, and Zainab faydhe Al-Azzawi. "Performance Comparison between DPSK and OQPSK modulation approaches in multi environments channels with Matlab Simulink models." Wasit Journal of Engineering Sciences 7, no. 1 (2019): 30–39. http://dx.doi.org/10.31185/ejuow.vol7.iss1.112.

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Phase shift keying modulation approaches are widely used in the communication industry. Differential phase shift keying (DPSK) and Offset Quadrature phase shift keying (OQPSK) schemes are chosen to be investigated is multi environment channels, where both systems are designed using MATLAB Simulink and tested. Cross talk and unity of signals generated from DPSK and OQPSK are examined using Cross-correlation and auto-correlation, respectively. In this research a proposed system included improvement in bit error rate (BER) of both systems in the additive white Gaussian Noise (AWGN) channel, by using the convolutional and block codes, by increasing the ratio of energy in the specular component to the energy in the diffuse component (k) and the diversity order BER in the fading channels will be improved in both systems.
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11

M. Alatwi, Aadel, and Ahmed Nabih Zaki Rashed. "Hybrid CPFSK/OQPSK modulation transmission techniques’ performance efficiency with RZ line coding–based fiber systems in passive optical networks." Indonesian Journal of Electrical Engineering and Computer Science 21, no. 1 (2021): 263. http://dx.doi.org/10.11591/ijeecs.v21.i1.pp263-270.

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<p><span>This study shows hybrid continuous-phase frequency shift keying (CPFSK)/optical quadrature-phase shift keying (OQPSK) modulation transmission techniques’ performance efficiency with return-to-zero (RZ) line coding scheme–based fiber systems in passive optical networks. Max. Q factor/min. bit error rate variations versus modulation frequency and fiber length are studied in detail for various bits/symbol, based on hybrid proposed modulation transmission techniques. Also, optical power and received electrical power variations are simulated with fiber-length variations at a specified modulation frequency of 300 GHz. Max. Q Factor, min. BER, max. signal power, and min. noise power variations are based on hybrid modulation techniques for CPFSK/OQPSK of 32 bits/symbol and a modulation frequency of 500 GHz through a fiber length of 30 km.</span></p>
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12

Gusmão Correia, A., V. Gonçalves, and N. Esteves. "Transmission modelling of ENCAP-OQPSK radio links." IEE Proceedings - Communications 145, no. 6 (1998): 419. http://dx.doi.org/10.1049/ip-com:19982447.

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13

Dai, Shengchen, Hua Qian, Kai Kang, and Weidong Xiang. "A Robust Demodulator for OQPSK–DSSS System." Circuits, Systems, and Signal Processing 34, no. 1 (2014): 231–47. http://dx.doi.org/10.1007/s00034-014-9844-z.

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14

Hamza, Ekhlas K., and Russul H. Hadi. "Implementation of Transmitter Zigbee System based on Wireless Sensor Network of IEEE 802.15.4 Standard." Al-Khwarizmi Engineering Journal 13, no. 3 (2017): 38–45. http://dx.doi.org/10.22153/kej.2017.03.002.

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Abstract
 
 Zigbee is considered to be one of the wireless sensor networks (WSNs) designed for short-range communications applications. It follows IEEE 802.15.4 specifications that aim to design networks with lowest cost and power consuming in addition to the minimum possible data rate. In this paper, a transmitter Zigbee system is designed based on PHY layer specifications of this standard. The modulation technique applied in this design is the offset quadrature phase shift keying (OQPSK) with half sine pulse-shaping for achieving a minimum possible amount of phase transitions. In addition, the applied spreading technique is direct sequence spread spectrum (DSSS) technique, which has the effect in getting better performance for the transmitter system in multipath environments. The system is developed through the use of MATLAB/Simulink to show the performance of the proposed system in response to the appliy modulation technique.
 
 Keywords: DSSS technique, IEEE 802.15.4, MSK, OQPSK, Zigbee.
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15

Tuset-Peiró, Pere, Francisco Vázquez-Gallego, Jonathan Muñoz, Thomas Watteyne, Jesus Alonso-Zarate, and Xavier Vilajosana. "Experimental Interference Robustness Evaluation of IEEE 802.15.4-2015 OQPSK-DSSS and SUN-OFDM Physical Layers for Industrial Communications." Electronics 8, no. 9 (2019): 1045. http://dx.doi.org/10.3390/electronics8091045.

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In this paper, we experimentally evaluate and compare the robustness against interference of the OQPSK-DSSS (Offset Quadrature Phase Shift Keying-Direct Sequence Spread Spectrum) and the SUN-OFDM (Smart Utility Network-Orthogonal Frequency Division Multiplexing) physical layers, as defined in the IEEE 802.15.4-2015 standard. The objective of this study is to provide a comprehensive analysis of the impact that different levels of interference produce on these modulations, in terms of the resulting PDR (Packet Delivery Ratio) and depending on the length of the packet being transmitted. The results show that the SUN-OFDM physical layer provides significant benefits compared to the ubiquitous OQPSK-DSSS in terms of interference robustness, regardless of the interference type and the packet length. Overall, this demonstrates the suitability of choosing the SUN-OFDM physical layer when deploying low-power wireless networks in industrial scenarios, especially taking into consideration the possibility of trading-off robustness and spectrum efficiency depending on the application requirements.
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16

Studański, Ryszard. "Digital Receiving of OQPSK Signals Dedicated for Maritime Mechatronic Systems." Solid State Phenomena 180 (November 2011): 366–71. http://dx.doi.org/10.4028/www.scientific.net/ssp.180.366.

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In this paper authors present a possible way to receive a narrowband digital signal that was previously registered in a wide spectrum. To begin with a scheme of receiving equipment is shown. Next, the digital signal processing leading to extraction information from narrowband OQPSK signal is described.
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17

Makarov, Sergey B., Mingxin Liu, Anna S. Ovsyannikova, et al. "A Reduction of Peak-to-Average Power Ratio Based Faster-Than-Nyquist Quadrature Signals for Satellite Communication." Symmetry 13, no. 2 (2021): 346. http://dx.doi.org/10.3390/sym13020346.

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The increase in the throughput of digital television and radio broadcasting (DVB) channels can be achieved due to application of signals with a compact spectrum and a relatively small peak-to-average power ratio (PAPR). The reason is the usage of traveling wave tubes (TWT) for amplifying and transmitting signals from a satellite repeater in DVB-S2X systems. At the same time, given that the bandwidth allocated for transmission should be used as efficiently as possible, a high reduction rate of out-of-band emissions level is required. The most effective solution in this direction is the transition to spectrum-economic signals, such as optimal Faster-Than-Nyquist (FTN) signals, which can provide a certain reduction rate of the out-of-band emissions level and minimum acceptable PAPR. This article proposes a method for obtaining optimal FTN pulses, which have symmetry in time domain, with specified PAPR and reduction rate of out-of-band emissions for the quadrature phase shift keying (QPSK) and offset quadrature phase shift keying (OQPSK). The possibility of synthesizing signals with OQPSK modulation is presented theoretically for the first time. Optimal FTN signals can provide PAPR reduction by at most 3 dB and outperform known root raised cosine (RRC) pulses. The simulation model adopts an architecture for quadrature generation of optimal FTN signals with OQPSK modulation with blocks for adjustable pre-amplification, clipping, and power amplification. The proposed signals can be used to increase the spectral and energy efficiencies of satellite broadcasting systems, such as DVB-S2/S2X, as well as low-rate return channels of interactive broadcasting systems with a frequency resource shortage.
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18

Dwivedi, Yash. "Telemetry Ranging System using OQPSK for Space Application." International Journal for Research in Applied Science and Engineering Technology 6, no. 6 (2018): 1416–19. http://dx.doi.org/10.22214/ijraset.2018.6207.

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19

Ahmad, J., T. G. Jeans, and B. G. Evans. "Digital frequency error detectors for OQPSK satellite modems." Electronics Letters 27, no. 20 (1991): 1821. http://dx.doi.org/10.1049/el:19911131.

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20

Ritu, Namdeo and Dr. Swapnil Nema. "Evaluation and Implementation of Different Digital Schemes for FSO Channel." International Journal of Emerging Technology and Advanced Engineering 11, no. 12 (2021): 985–90. https://doi.org/10.5281/zenodo.5806679.

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<strong>Free space optical communication is becoming an increasingly important technology for the wireless market since it introduces a higher data transmission rate and large bandwidth. In this work, we have compared DPSK and OQPSK systems. Several measurements were performed including Bit Error Rate (BER) curves for optimum reception, eye diagram with the variation of input signal and distance of medium for each of the systems. Recent digital fiber optic communication systems address modulation and detection techniques for high spectral efficiency and robustness against transmission impairments. The proposed objective of this project is to design studies and analyze the simulation model of a Digital fiber Communication System using Opti system 7.0. The main objective of this work is to analyze different approaches to mitigate the FSO channel impairments influencing the transmission limitations in Optical Communication. Two modulation formats viz., Differential Phase Shift Keying (DPSK) and Offset Quadrature Phase Shift Keying (OQPSK) have been considered in the present analysis focusing on theoretical considerations, mathematical modelling and computer simulations. The major focus is to analyze, evaluate and characterize different types of optimal encoding schemes to infer the system design parameters in order to achieve an optimum performance.</strong>
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21

Pooja, Gupta, and Khaparkar Shailesh. "Evaluation and Implementation of Different Digital Schemes for FSO Channel." International Journal of Emerging Technology and Advanced Engineering 12, no. 7 (2022): 621–26. https://doi.org/10.5281/zenodo.6970016.

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<strong>Free space optical communication is becoming an increasingly important technology for the wireless market since it introduces a higher data transmission rate and large bandwidth. In this work, we have compared DPSK and OQPSK systems. Several measurements were performed including Bit Error Rate (BER) curves for optimum reception, eye diagram with the variation of input signal and distance of medium for each of the systems. Recent digital fiber optic communication systems address modulation and detection techniques for high spectral efficiency and robustness against transmission impairments. The proposed objective of this project is to design studies and analyze the simulation model of a Digital fiber Communication System using Opti system 7.0. The main objective of this work is to analyze different approaches to mitigate the FSO channel impairments influencing the transmission limitations in Optical Communication. Two modulation formats viz., Differential Phase Shift Keying (DPSK) and Offset Quadrature Phase Shift Keying (OQPSK) have been considered in the present analysis focusing on theoretical considerations, mathematical modelling and computer simulations. The major focus is to analyze, evaluate and characterize different types of optimal encoding schemes to infer the system design parameters in order to achieve an optimum performance.</strong>
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22

Pooja, Gupta, and Khaparkar Shailesh. "Evaluation and Implementation of Different Digital Schemes for FSO Channel." International Journal of Emerging Technology and Advanced Engineering 12, no. 7 (2022): 621–26. https://doi.org/10.5281/zenodo.6972720.

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<strong>Free space optical communication is becoming an increasingly important technology for the wireless market since it introduces a higher data transmission rate and large bandwidth. In this work, we have compared DPSK and OQPSK systems. Several measurements were performed including Bit Error Rate (BER) curves for optimum reception, eye diagram with the variation of input signal and distance of medium for each of the systems. Recent digital fiber optic communication systems address modulation and detection techniques for high spectral efficiency and robustness against transmission impairments. The proposed objective of this project is to design studies and analyze the simulation model of a Digital fiber Communication System using Opti system 7.0. The main objective of this work is to analyze different approaches to mitigate the FSO channel impairments influencing the transmission limitations in Optical Communication. Two modulation formats viz., Differential Phase Shift Keying (DPSK) and Offset Quadrature Phase Shift Keying (OQPSK) have been considered in the present analysis focusing on theoretical considerations, mathematical modelling and computer simulations. The major focus is to analyze, evaluate and characterize different types of optimal encoding schemes to infer the system design parameters in order to achieve an optimum performance.</strong>
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23

Liu, Zilong, Kexian Gong, Peng Sun, Jicai Deng, Kunheng Zou, and Linlin Duan. "OQPSK Synchronization Parameter Estimation Based on Burst Signal Detection." Electronics 10, no. 1 (2021): 69. http://dx.doi.org/10.3390/electronics10010069.

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The fast estimation of synchronization parameters plays an extremely important role in the demodulation of burst signals. In order to solve the problem of high computational complexity in the implementation of traditional algorithms, a synchronization parameter (frequency offset, phase offset, and timing error) estimation algorithm based on Offset Quadrature Phase Shift Keying (OQPSK) burst signal detection is proposed in this article. We first use the Data-Aided (DA) method to detect where the burst signal begins by taking the segment correlation between the receiving signals and the known local Unique Word (UW). In the sequel, the above results are adopted directly to estimate the synchronization parameters, which is obviously different from the conventional algorithms. In this way, the complexity of the proposed algorithm is greatly reduced, and it is more convenient for hardware implementation. The simulation results show that the proposed algorithm has high accuracy and can track the Modified Cramer–Rao Bound (MCRB) closely.
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24

Waldhorst, Andreas, Rolf Weber, and Johann F. Böhme. "Blind multichannel decision‐feedback equalization of precoded OQPSK signals." Journal of the Acoustical Society of America 109, no. 5 (2001): 2477. http://dx.doi.org/10.1121/1.4744803.

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25

D'Amico, A. A., A. N. D'Andrea, and U. Mengali. "Feedforward joint phase and timing estimation with OQPSK modulation." IEEE Transactions on Vehicular Technology 48, no. 3 (1999): 824–32. http://dx.doi.org/10.1109/25.764999.

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26

Beaulieu, N. C., and C. C. Climie. "Optimization of offset for OQPSK with time limited pulses." IEEE Transactions on Communications 40, no. 12 (1992): 1793–95. http://dx.doi.org/10.1109/26.192401.

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27

Mirbagheri, A., K. N. Plataniotis, and S. Pasupathy. "An enhanced widely linear CDMA receiver with OQPSK modulation." IEEE Transactions on Communications 54, no. 2 (2006): 261–72. http://dx.doi.org/10.1109/tcomm.2005.863766.

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28

Peng, Hua, Jun-jie Wang, Hai-feng Ding, and Xin Yang. "An Algorithm of OQPSK Carrier Synchronization Based on Quadratic Spectrum." Journal of Electronics & Information Technology 33, no. 4 (2011): 997–1001. http://dx.doi.org/10.3724/sp.j.1146.2010.00471.

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29

Gusmão, A. M., and N. L. Esteves. "ENCAP-4: an OQPSK-type modulation technique for digital radio." IEE Proceedings F Communications, Radar and Signal Processing 135, no. 1 (1988): 105. http://dx.doi.org/10.1049/ip-f-1.1988.0014.

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30

Landolsi, Mohamed A., and Wayne E. Stark. "Optimal chip waveforms for DS-CDMA with generalized OQPSK modulation." European Transactions on Telecommunications 8, no. 5 (1997): 527–36. http://dx.doi.org/10.1002/ett.4460080510.

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31

Adhiguna, Mohammad Hakim, Prapto Nugroho, and Sigit Basuki Wibowo. "Optimize BER Offset QPSK Baseband Modulation-Demodulation featuring AWGN and OFDM." Journal of Electrical, Electronic, Information, and Communication Technology 4, no. 2 (2022): 56. http://dx.doi.org/10.20961/jeeict.4.2.65820.

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&lt;p class="Abstract"&gt;In communication system, being fastest not always the best option because of much great error probabilities. Complex architecture also cost high for the component maintenances. An optimal OQPSK modem is provide for friendly use and affordable model in academic purposes. The proposed method is moderate way with twice data size than the conventional method, but error calculation is exactly constant. Good and optimal BER measurements from simulated binary data useful for academic learning purpose. &lt;em&gt;&lt;/em&gt;&lt;/p&gt;
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32

Yan, Xiao, Qian Wang, and Kaiyu Qin. "Joint timing synchronization algorithm for OQPSK real-time multi-domain analysis." JOURNAL OF ELECTRONIC MEASUREMENT AND INSTRUMENT 2009, no. 10 (2009): 48–54. http://dx.doi.org/10.3724/sp.j.1187.2009.10048.

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33

Faulkner, Evan, Zelin Yun, Shengli Zhou, Zhijie J. Shi, Song Han, and Georgios B. Giannakis. "An Advanced GNU Radio Receiver of IEEE 802.15.4 OQPSK Physical Layer." IEEE Internet of Things Journal 8, no. 11 (2021): 9206–18. http://dx.doi.org/10.1109/jiot.2021.3057472.

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34

Li, L., and M. K. Simon. "Performance of Coded OQPSK and MIL-STD SOQPSK With Iterative Decoding." IEEE Transactions on Communications 52, no. 11 (2004): 1890–900. http://dx.doi.org/10.1109/tcomm.2004.836557.

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35

I. El-Nahal, Fady, and Mamoun A. Salha. "Comparison between OQPSK and DPSK Bidirectional Radio over Fiber Transmission Systems." Universal Journal of Electrical and Electronic Engineering 1, no. 4 (2013): 129–33. http://dx.doi.org/10.13189/ujeee.2013.010405.

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36

D'Amico, Antonio A. "Efficient Maximum-Likelihood Based Clock and Phase Estimators for OQPSK Signals." IEEE Transactions on Communications 63, no. 7 (2015): 2647–57. http://dx.doi.org/10.1109/tcomm.2015.2431678.

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37

YANG Yi, 杨祎, 雷佳园 LEI Jiayuan, 王晓波 WANG Xiaobo, 贺锋涛 HE Fengtao, 刘妍 LIU Yan та 聂欢 NIE Huan. "复合海水信道偏移四相相移键控调制系统性能研究". ACTA PHOTONICA SINICA 51, № 10 (2022): 1006006. http://dx.doi.org/10.3788/gzxb20225110.1006006.

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38

Gusmão, A., and P. Montezuma. "Highly power∕bandwidth efficient digital transmission with selected ENCAP-OQPSK modulation schemes." Electronics Letters 38, no. 5 (2002): 231. http://dx.doi.org/10.1049/el:20020179.

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39

Ji Won Jung and Myung Sup Kim. "Performance analysis of extended OQPSK carrier phase recovery algorithm in satellite channel." IEEE Transactions on Consumer Electronics 46, no. 1 (2000): 52–57. http://dx.doi.org/10.1109/30.826381.

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40

Montezuma, P., and A. Gusmão. "Design of TC-OQAM schemes using a generalised nonlinear OQPSK-type format." Electronics Letters 35, no. 11 (1999): 860. http://dx.doi.org/10.1049/el:19990616.

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41

Yonis, A. Z. "Influence of low power consumption on IEEE 802.15.4 in wireless networks performance." Bulletin of Electrical Engineering and Informatics 9, no. 1 (2020): 205–11. http://dx.doi.org/10.11591/eei.v9i1.1678.

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IEEE 802.15.4 standard defines both media access control (MAC) and physical (PHY) layer protocols for low power consumption, low peak data rate, and low cost applications. Nowadays the most important feature of IEEE 802.15.4 is maximizing battery life. This paper is focusing how to achieve low average power consumption through assuming that the amount of data transmitted is short and that it is transmitted infrequently so as to keep a low duty cycle. The outcomes demonstrate that the phase shift estimation of Offset quadrature phase-shift keying (OQPSK) modulation has no impact on bit error rate (BER) if it is identical in the transmitter as same as in the receiver.
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42

A., Z. Yonis. "Influence of low power consumption on IEEE 802.15.4 in wireless networks performance." Bulletin of Electrical Engineering and Informatics 9, no. 1 (2020): 205–11. https://doi.org/10.11591/eei.v9i1.1678.

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IEEE 802.15.4 standard defines both media access control (MAC) and physical (PHY) layer protocols for low power consumption, low peak data rate, and low cost applications. Nowadays the most important feature of IEEE 802.15.4 is maximizing battery life. This paper is focusing how to achieve low average power consumption through assuming that the amount of data transmitted is short and that it is transmitted infrequently so as to keep a low duty cycle. The outcomes demonstrate that the phase shift estimation of Offset quadrature phase-shift keying (OQPSK) modulation has no impact on bit error rate (BER) if it is identical in the transmitter as same as in the receiver.
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43

Escobar-Molero, Antonio. "Improving reliability and latency of Wireless Sensor Networks using Concurrent Transmissions." at - Automatisierungstechnik 67, no. 1 (2019): 42–50. http://dx.doi.org/10.1515/auto-2018-0064.

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Abstract Concurrent Transmissions (CT) based flooding appears as a highly reliable and low latency mechanism to achieve source-to-sink communication of packets within a Wireless Sensor Network (WSN). CT are usually misunderstood, since they are mainly analyzed in the baseband domain. A comprehensive analysis, including the effects of the carrier, demonstrates that they cannot work in simple phase-modulated communication systems due to the beating effect. In contrast, non-coherent frequency receivers offer a very robust behavior. CT applicability in IEEE 802.15.4 is mainly because of two factors: transmissions are usually demodulated as non-coherent MSK (as opposed to coherent OQPSK) and the Direct Sequence Spread Spectrum (DSSS), that helps minimizing the error rate.
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44

Zicari, Paolo, Emanuele Sciagura, Stefania Perri, and Pasquale Corsonello. "A programmable carrier phase independent symbol timing recovery circuit for QPSK/OQPSK signals." Microprocessors and Microsystems 32, no. 8 (2008): 437–46. http://dx.doi.org/10.1016/j.micpro.2008.06.001.

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45

Simard, Guillaume, Mohamad Sawan, and Daniel Massicotte. "High-Speed OQPSK and Efficient Power Transfer Through Inductive Link for Biomedical Implants." IEEE Transactions on Biomedical Circuits and Systems 4, no. 3 (2010): 192–200. http://dx.doi.org/10.1109/tbcas.2009.2039212.

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46

Oka, Ikuo. "Intersymbol and CW Interference in QPSK, OQPSK, and MSK Hard-Limiting Satellite Systems." IEEE Transactions on Aerospace and Electronic Systems AES-22, no. 1 (1986): 91–97. http://dx.doi.org/10.1109/taes.1986.310697.

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47

Afonso, Daniel, Francisco Cercas, Rui Dinis, Rui Rodrigues, and Ângelo Luz. "Analytical computation of the correlation of spreading sequences for nonlinear OQPSK-type modulations." Transactions on Emerging Telecommunications Technologies 23, no. 7 (2012): 678–87. http://dx.doi.org/10.1002/ett.2524.

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48

Kadhum, Ekhlas, and Russul Haitham. "Performance Analysis of IEEE 802.15.4 Transceiver System under Adaptive White Gaussian Channel." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 6 (2018): 4184. http://dx.doi.org/10.11591/ijece.v8i6.pp4184-4196.

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Zigbee technology has been developed for short range wireless sensor networks and it follows IEEE 802.15.4 standard. For such sensors, several considerations should be taken including; low data rate and less design complexity in order to achieve efficient performance considering to the transceiver systems. This research focuses on implementing a digital transceiver system for Zigbee sensor based on IEEE 802.15.4. The system is implemented using offset quadrature phase shift keying (OQPSK) modulation technique with half sine pulse-shaping method. Direct conversion scheme has been used in the design of Zigbee receiver in order to fulfill the requirements mentioned above. System performance is analyzed considering to BER when it encountered adaptive white Gaussian noise (AWGN), besides showing the effect of using direct sequence spread spectrum (DSSS) technique.
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49

Spalvieri, Arnaldo, and Maurizio Magarini. "Wiener's Loop Filter for PLL-Based Carrier Recovery of OQPSK and MSK-Type Modulations." Research Letters in Communications 2008 (2008): 1–4. http://dx.doi.org/10.1155/2008/235761.

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This letter considers carrier recovery for offset quadrature phase shift keying (OQPSK) and minimum shift keying-type (MSK-type) modulations based on phase-lock loop (PLL). The concern of the letter is the optimization of the loop filter of the PLL. The optimization is worked out in the light of Wiener's theory taking into account the phase noise affecting the incoming carrier, the additive white Gaussian noise that is present on the channel, and the self-noise produced by the phase detector. Delay in the loop, which may affect the numerical implementation of the PLL, is also considered. Closed-form expressions for the loop filter and for the mean-square error are given for the case where the phase noise is characterized as a first-order process.
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50

Kadhum, Ekhlas, and Russul Haitham. "Performance Analysis of IEEE 802.15.4 Transceiver System under Adaptive White Gaussian Channel." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 6 (2018): 4184–96. https://doi.org/10.11591/ijece.v8i6.pp4184-4196.

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Abstract:
Zigbee technology has been developed for short range wireless sensor networks and it follows IEEE 802.15.4 standard. For such sensors, several considerations should be taken including; low data rate and less design complexity in order to achieve efficient performance considering to the transceiver systems. This research focuses on implementing a digital transceiver system for Zigbee sensor based on IEEE 802.15.4. The system is implemented using offset quadrature phase shift keying (OQPSK) modulation technique with half sine pulse-shaping method. Direct conversion scheme has been used in the design of Zigbee receiver in order to fulfill the requirements mentioned above. System performance is analyzed considering to BER when it encountered adaptive white Gaussian noise (AWGN), besides showing the effect of using direct sequence spread spectrum (DSSS) technique.
APA, Harvard, Vancouver, ISO, and other styles
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