Optimization of pilot placement in adaptive M-PSK modulation systems in Rayleigh fading channel

Performance of constant-power variable-rate M-PSK schemes over Rayleigh fading channels in the presence of Imperfect Channel State Information is investigated for a single frame decoding and prediction. Negligible time delay between channel estimation and signal set adaptation was assumed. The optimization of frame duration, conditioned on the target BER is investigated. An analytical expression for the desired threshold is derived. Its dépendance on the targeted BER and quality of the feedback is investigated.