Soft decision demodulation to reduce the effect of transmission errors in logarithmic PCM transmitted over Rayleigh fading channels.
01 January 1984
Soft decision demodulation applied to mu-law PCM encoded signals transmitted over Rayleigh fading channels by means of coherent phase shift keying (CPSK) modulation is investigated. Each bit in the mu-law PCM word is assigned its own soft decision demodulation erasure threshold. These thresholds are theoretically determined as a function of the input power level, channel S/N, and the relative mean square error power delta that occurs due to the replacement by interpolation or prediction of those samples discarded in the soft decision demodulation process.