SOVA-based iterative decoding of turbo coded OOK and turbo coded BPPM

Infrared wireless communication and optical communication usually adopt on-off keying (OOK) and pulse position modulation (PPM). Previously (see Yamamoto, N. and Ohtsuki, T., Proc. IEEE GLOBECOM'01, vol.3, p.1913-17, 2001), we presented the iterative maximum a posteriori (MAP) probability decoding of turbo coded OOK and turbo coded binary PPM (BPPM). We now present a soft-output Viterbi algorithm (SOVA) based iterative decoding of turbo coded OOK and turbo coded BPPM. We show that the BER of both turbo coded OOK and turbo coded BPPM are almost identical and improve as the number of iterations is increased.

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