Abstract:

A low complexity iterative precoding algorithm is proposed for multiuser multipl einput multipleoutput (MIMO) downlink systems where a single data stream is allocated to each user. In the algorithm, precoders are designed according to th e zero forcing (ZF) criterion, and receive filters are updated via maximum ratio combining. Assuming one data stream per user, the algorithm has almost no perfo rmance loss compared with the iterative NuSVD algorithm, and the magnitude of co mplexity per iteration is one Kth that of the published one (K denotes t he number of users, K≥2), thus saving more than 50% total complexity costs. Simulations verify the effectiveness of the proposed algorithm.

Key words: multiuser multipleinput multipleoutput, precoding, sum capacity, complexity