Abstract
The performance of convolutionally coded On-Off Keying (OOK) and M-ary Pulse Position Modulation (M-PPM) systems is evaluated for avalanche photodetection receiver. Results are presented in terms of bit error probability and achievable coding gains for both hard decision and soft decision Viterbi decoding. The computed results predict that for the soft decision Viterbi decoding with code constraint length K=6, binary PPM, 4-ary PPM, 8-ary PPM and OOK achieve coding gain of 5.34 dB, 8.11 dB, 9.83 dB and 7.83 dB respectively relative to the uncoded binary PPM. The results of hard decision decoding are approximately 2.5–3.0 dB less than those for the soft decision case.
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