An iterative receiver for turbo-coded pilot-assisted modulation in fading channels

In this letter, we introduce an iterative joint channel and data estimation receiver that exploits both the power of pilot-symbol assisted modulation (PSAM) and turbo coding for fading channels. The key innovation is a low-co mplexity soft channel estimator which divides a processing block into overl apped cells and performs maximum a posteriori (MAP) sequence estimation and MMSE filtering based on the received signal and extrinsic information deli vered by the soft channel decoder. Simulation results show that for turbo-c oded PSAM systems under time-variant fading the proposed receiver offers si gnificant performance gains over a noniterative receiver and two other canc ellation schemes.