A joint coded two-step multiuser detection scheme for MIMO OFDM system

Multiple-input, multiple-output (MIMO) communication is an effective scheme to improve wireless communication performance of multiuser applications. However, reliable communication, in multiuser systems is affeeted by the presence of both multi-access interference (MAI) and inter-symbol interference (ISl) in, multi-path channels. In this paper, we therefore investigate a transceiver design for a wideband multiuser-MIMO communication system, where the co-channel users are equipped with, multiple transmit and multiple receive antennas. In particular, We propose a two-step interference cancellation scheme with an error correction coding technique for the receiver of a multiuser uplink system. The scheme employs orthogonal frequency division multiplexing (OFDM) modulation and space-time block codes (STBC). The receiver performs as a soft output multiuser detector based on minimum mean-squared error (MMSE) interference suppression at the first stage, and then, MAI cancellation is implemented with a bank of single-user channel decoders. The paper also includes computer simulations which help to improve the understanding of specific issues involved in the design of multiuser STBC OFDM systems, and confirm the utility of the proposed approach.