3 April 2008 OFDM LDPC performance comparison on an HF multipath fading channel
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Abstract
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, short block length block length (9e+3) Low Density Parity Check (LDPC) forward error correction codes used in conjunction with Orthogonal Frequency Division Multiplexing (OFDM) will be shown to provide excellent communication performance across the HF channel. Average bit error rate performance results will be shown for a 2ms, 1Hz and 2Hz Watterson HF channel model for both regular and irregular LDPC parity check matrices. Some results will also be shown for imperfect channel estimation and its effects upon the performance of the LDPC decoder.
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Fred C. Kellerman, Fred C. Kellerman, } "OFDM LDPC performance comparison on an HF multipath fading channel", Proc. SPIE 6980, Wireless Sensing and Processing III, 698006 (3 April 2008); doi: 10.1117/12.785331; https://doi.org/10.1117/12.785331
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