MIMO channel equalization using set-membership affine projection algorithm

A multiple-input multiple-output (MIMO) channel equalization scheme for time-varying wireless channels is proposed. The proposed equalization technique uses set-membership affine projection (SM-AP) algorithm for updating filter weights of a decision feedback equalizer (DFE). The performance of the proposed scheme is investigated through simulations using wireless channel models recommended by International Telecommunication Union for Radiocommunication Sector (ITU-R). The results show that the proposed scheme achieves a fast convergence speed. The convergence performance of this scheme has also been studied for different projection order and compared with the convergence performance of set-membership normalized least mean-square (SM-NLMS) algorithm based MIMO-DFE. The proposed equalizer has low complexity and works well even in frequency-selective channels.