Iterative channel estimation and turbo decoding in OFDM systems

Iterative channel estimation and decoding (ICED) technique is widely used to improve the performance of the receiver in wireless communication systems. In this paper, we first consider a direct Minimum Mean Square Error (MMSE) channel estimation with turbo channel decoding for Orthogonal Frequency Division Multiplexing (OFDM) systems under a timevarying channel environment. The soft-information from turbo decoder can be efficiently incorporated into the channel estimator which consequently results in a better performance within the iterative receiver. Then, we propose a new simple and effective time-domain MMSE channel estimation method which even provides a better performance with a low complexity.