A design of code-aided channel estimation in two-way relay networks

In this paper, the channel estimation problem at the relay node in TWRN is investigated. We propose a turbo receiver at the relay where it jointly combines a nonbinary decoder and an EM estimator. By passing soft value between the decoder and estimator in an iterative manner, our approach outperforms the method of separate decoding and estimation in terms of mean square error (MSE) and bit error rates (BER).