Hybrid hard and soft decision decoding of Reed-Solomon codes for M-ARY frequency-shift keying
Robertson, R. Clark
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All modern communication systems use some form of forward error correction coding. Generally, coding gain is improved when soft decision decoding is used instead of hard decision decoding. While soft decision decoding is a mature technology for convolutional codes, practical soft decision decoding for the commonly used Reed-Solomon (RS) non-binary block code has only recently been developed and is currently limited to use with bandwidth efficient modulation schemes such as M-ary phase-shift keying. Since JTIDS/Link-16 uses quasi-orthogonal, cyclic code-shift keying (CCSK), in this thesis, soft decision decoding of RS encoded symbols is extended to M-ary frequency-shift keying, a power efficient modulation scheme. In addition, the soft decision decoding scheme recently developed, actually a hybrid hard decision-soft decision (HD SD) decoding scheme, is improved for both bandwidth efficient and power efficient modulation schemes. Finally, the effect of the hybrid HD SD decoding technique on signals corrupted by additive white Gaussian noise (AWGN) and other interference, including Pulse Noise Interference (PNI), is examined. The performances of various systems using the hybrid HD SD decoding technique were investigated using both analysis and simulation. It was found that HD SD decoding is generally effective in minimizing the degradation in system performance due to PNI but has only a small benefit when only AWGN is present.
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Performance analysis of a Link-16 compatible waveform using errors-and-erasures decoding when corrupted by pulse-noise interference Lekkakos, Dimitrios; Kragh, Frank; Robertson, Clark (IEEE, 2009);The Link-16 is the tactical data link utilized by the Joint Tactical Information Distribution System (JTIDS). The JTIDS system is important due to its wide use by U.S. armed forces, NATO, and other allied militaries. Link-16 ...
Performance analysis of the Link-16/JTIDS waveform with concatenated coding, soft decision Reed Solomon decoding and noise-normalization Katsaros, Charalampos (Monterey, California. Naval Postgraduate School, 2010-09);The Joint Tactical Information Distribution System (JTIDS) is a hybrid frequencyhopped, direct sequence spread spectrum system that employs a (31, 15) Reed-Solomon (RS) code for forward error correction coding. In this ...
Caldwell, James (2013-06-25);Embodiments in accordance with the invention utilize Reed Solomon (RS) forward error correction (FEC) in conjunction with M-ary Bandwidth Efficient Modulation (BEM) schemes and soft decision decoding to improve the robustness ...