Forward and backward RLS-DDCE processing in MIMO-OFDM spatial multiplexing receivers

[摘要] In this paper we present a novel approach in frequency domain channelestimation technique. Our proposal is based on the recursive least squares (RLS)algorithm combined with the decision making process called decisiondirected channel estimation (RLS-DDCE). The novelty and key concept of thistechnique is the block-wise causal and anti-causal RLS processing that yieldstwo independent processing of RLS along with the associateddecisions. Due to the implemented low density parity check (LDPC) code thereceiver operates with soft information, which enables us to introduce a newmodification of the Turbo principle as well as simple addition of thea-posteriori log-likelihood ratios (LLRs). Although the computationalcomplexity is increased by both of our approaches, the latter is relativelyless complex than the earlier. Simulation results show that theseimplementations outperform the simple RLS-DDCE algorithm and yield lower biterror rates (BER) and more accurate channel information.

[学科分类] 电子、光学、磁材料