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23 July 2003 LDPC OFDM space-time multipath fading channel results
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High Frequency (HF) radio communication channels provide unique challenges to digital communication systems. Typical HF communication systems propagate electromagnetic energy in the 2-30MHz radio spectrum using the earth’s ionosphere and surface as both refractors and reflectors for non line of sight communications. Constantly changing ionosphere conditions result in multipath and severe fading channel characteristics. Through numerical simulation, small block length (520) Low Density Parity Check (LDPC) forward error correction codes used in conjunction with Orthogonal Frequency Division Multiplexing (OFDM) and Space-Time (ST) channel coding are shown to provide excellent communication performance across the HF channel. Average bit error rate performance results will be shown for a 2ms, 2Hz Watterson HF channel model as well as results for the independent Rayleigh fading channel. The space-time simulation parameters were chosen to model an Alamouti dual antenna transmit, single antenna receive communication system utilizing practical data and sampling rates.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Fred C. Kellerman "LDPC OFDM space-time multipath fading channel results", Proc. SPIE 5100, Digital Wireless Communications V, (23 July 2003);

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