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Dissertations / Theses on the topic 'Coded orthogonal frequencydivision multiplexing'

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Published: 5 June 2025
Last updated: 15 July 2025

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1

Welling, Kenneth. "Coded Orthogonal Frequency Division Multiplexing for the Multipath Fading Channel." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/608525.

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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>This paper presents a mathematical model for Coded Orthogonal Frequency Division Multiplexing (COFDM) in frequency selective multipath encountered in aeronautical telemetry. The use of the fast Fourier transform (FFT) for modulation and demodulation is reviewed. Error control coding with interleaving in frequency is able to provide reliable data communications during frequency selective multipath fade events. Simulations demonstrate QPSK mapped COFDM performs well
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2

Rende, Deniz. "Bit-interleaved space-frequency coded modulation for orthogonal frequency-division multiplexing systems." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0006420.

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3

Lee, King F. "Space-time and space-frequency coded orthogonal frequency division multiplexing transmitter diversity techniques." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/14981.

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4

Rice, Michael, and Kenneth Welling. "CODED OFDM FOR AERONAUTICAL TELEMETRY." International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/606496.

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International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California<br>Three Quadrature Phase Shift Keying (QPSK) mapped COFDM systems demonstrating a continuum of complexity levels are simulated over an evolving three ray model of the multipath fading channel with parameters interpolated from actual channel sounding experiments. The first COFDM system uses coherent QPSK and convolutional coding with interleaving in frequency, channel equalization and soft decision decoding; the second uses convolutional coding with in
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5

Ilunga, Lou. "Adaptive, Turbo-coded OFDM." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/34578.

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Wireless technologies, such as satellite, cellular, and wireless internet are now commercially driven by ever more demanding consumers, who are ready for seamless integration of communication networks from the home to the car, and into the office. There is a growing need to quickly transmit information wirelessly and accurately. Engineers have already combine techniques such as orthogonal frequency division multiplexing (OFDM) suitable for high data rate transmission with forward error correction (FEC) methods over wireless channels. <p> In this thesis, we enhance the system throughput of a w
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6

Saldanha, Nancy. "Modeling, design and fabrication of orthogonal and psuedo-orthogonal frequency coded SAW wireless spread spectrum RFID sensor tags." Doctoral diss., University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5025.

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Surface acoustic wave (SAW) sensors offer a wireless, passive sensor solution for use in numerous environments where wired sensing can be expensive and infeasible. Single carrier frequency SAW sensor embodiments such as delay lines, and resonators have been used in single sensor environments where sensor identification is not a necessity. The orthogonal frequency coded (OFC) SAW sensor tag embodiment developed at UCF uses a spread spectrum approach that allows interrogation in a multi-sensor environment and provides simultaneous sensing and sensor identification. The SAW device is encoded via
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7

Zou, Ding, and Ding Zou. "FPGA-Based LDPC Coded Modulations for Optical Transport Networks." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/622985.

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Current coherent optical transmission systems focus on single carrier solutions for 400Gb/s serial transmission to support traffic growth in fiber-optics communications, together with a few subcarriers multiplexed solutions for the 1 Tb/s serial data rates and beyond. With the advancement of analog-to-digital converter technologies, high order modulation formats up to 64-QAM with symbol rate up to 72Gbaud have been demonstrated experimentally with Raman amplification. To enable such high serial data rates, it is highly desirable to implement in hardware low complexity digital signal processi
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8

Roderick, David V. "A coded orthogonal frequency division multiplexing simulation of a high data rate, line-of-sight, digital radio for mobile maritime communications." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA333326.

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9

Oluwafemi, Ilesanmi Banjo. "Super-orthogonal space-time turbo coded OFDM systems." Thesis, 2012. http://hdl.handle.net/10413/8505.

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The ever increasing demand for fast and efficient broadband wireless communication services requires future broadband communication systems to provide a high data rate, robust performance and low complexity within the limited available electromagnetic spectrum. One of the identified, most-promising techniques to support high performance and high data rate communication for future wireless broadband services is the deployment of multi-input multi-output (MIMO) antenna systems with orthogonal frequency division multiplexing (OFDM). The combination of MIMO and OFDM techniques guarantees a
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10

Tsung-Yen, Tsai, and 蔡宗延. "Channel Estimation Technique for Space-Time Block Coded Orthogonal Frequency Division Multiplexing System." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/35634526574522357090.

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碩士<br>國立交通大學<br>電子工程系<br>91<br>Bandwidth is a very important resource in the wireless communication system. Improving the reliability of the wireless communication system without bandwidth expansion is always an interesting research topic. In 1998, space-time block code (STBC) is proposed to solve this problem. The basic concept of STBC is equipping multiple transmit antennas and/or receive antennas in the system to improve the performance. For simplicity, we only consider the system equipped with one receive antenna and two transmit antennas in this thesis. The performance of STBC
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11

Chih-Yuan, Yang. "Low-Density Parity-Check Coded Orthogonal Frequency Division Multiplexing Modulation System Design for Wireless Communication Applications." 2005. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2907200501524900.

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12

Yang, Chih-Yuan, and 楊智淵. "Low-Density Parity-Check Coded Orthogonal Frequency Division Multiplexing Modulation System Design for Wireless Communication Applications." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/01868796288249391246.

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碩士<br>國立臺灣大學<br>資訊工程學研究所<br>93<br>Trellis coded modulation (TCM) invented by G. Ungerboeck (1976) combined coding and modulation using constellation expansion and mapping by set partitioning to achieve substantial coding gains. Low-Density Parity-Check (LDPC) code invented by Gallager (1962) and rediscovered by Mackay and Neal recently (1996) are shown to have near-Shannon-limit performance. Combining with orthogonal frequency division multiplexing (OFDM) modulation technique using efficient coded modulation scheme, performance of LDPC coded OFDM modulation can be better than traditional conca
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13

Anoh, Kelvin O. O., Rameez Asif, Raed A. Abd-Alhameed, et al. "Multi-Antenna OFDM System Using Coded Wavelet with Weighted Beamforming." 2014. http://hdl.handle.net/10454/8423.

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yes<br>A major drawback in deploying beamforming scheme in orthogonal frequency division multiplexing (OFDM) is to obtain the optimal weights that are associated with information beams. Two beam weighting methods, namely co-phasing and singular vector decomposition (SVD), are considered to maximize the signal beams for such beamforming scheme. Initially the system performance with and without interleaving is investigated using coded fast Fourier transform (FFT)-OFDM and wavelet-based OFDM. The two beamforming schemes are applied to the wavelet-based OFDM as confirmed to perform better than t
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14

Sreedhar, Dheeraj. "Interference Cancelling Detectors In OFDMA/MIMO/Cooperative Communications." Thesis, 2007. https://etd.iisc.ac.in/handle/2005/604.

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In this thesis, we focus on interference cancelling (IC) detectors for advanced communication systems. The contents of this thesis is divided into the following four parts: 1. Multiuser interference (MUI) cancellation in uplink orthogonal frequency division multiple access (OFDMA). 2. Inter-carrier interference (ICI) and inter-symbol interference (ISI) cancellation in space-frequency block coded OFDM (SFBC-OFDM). 3. Single-symbol decodability (SSD) of distributed space-time block codes (DSTBC) in partially-coherent cooperative networks with amplify-and-forward protocol at the relays 4. Int
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15

Sreedhar, Dheeraj. "Interference Cancelling Detectors In OFDMA/MIMO/Cooperative Communications." Thesis, 2007. http://hdl.handle.net/2005/604.

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In this thesis, we focus on interference cancelling (IC) detectors for advanced communication systems. The contents of this thesis is divided into the following four parts: 1. Multiuser interference (MUI) cancellation in uplink orthogonal frequency division multiple access (OFDMA). 2. Inter-carrier interference (ICI) and inter-symbol interference (ISI) cancellation in space-frequency block coded OFDM (SFBC-OFDM). 3. Single-symbol decodability (SSD) of distributed space-time block codes (DSTBC) in partially-coherent cooperative networks with amplify-and-forward protocol at the relays 4. Interfe
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