International Journal of Emerging Technology and Advanced Engineering (IJETAE)
In this paper, various channel estimation techniques for iterative receivers are compared for OFDMIDMA system. Pilot - assisted based, semi-blind estimation, blind estimation and Decision - directed channel estimations techniques are considered and there comparisons are presented. The considered estimation techniques differ in terms of complexity, as well as performance. The main contribution of this paper is to give an overview of different channel estimation techniques OFDM-IDMA systems. There is no single channel estimator providing the best tradeoff and the authors' comparison shows the system load and SNR influence the estimator choice.