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 affected by the presence of both multi-access interference (MAI) and inter-symbol interference (ISI) 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.

[1]  H. Vincent Poor,et al.  Iterative (turbo) soft interference cancellation and decoding for coded CDMA , 1999, IEEE Trans. Commun..

[2]  Philip Schniter,et al.  Low-complexity equalization of OFDM in doubly selective channels , 2004, IEEE Transactions on Signal Processing.

[3]  A.B. Sesay,et al.  An iterative MMSE-decision feedback multiuser detector for space-time coded multicarrier CDMA system , 2004, Canadian Conference on Electrical and Computer Engineering 2004 (IEEE Cat. No.04CH37513).

[4]  Arumugam Nallanathan,et al.  Space-time coded MIMO-OFDM for high capacity and high data-rate wireless communication over frequency selective fading channels , 2002, 4th International Workshop on Mobile and Wireless Communications Network.

[5]  Siavash M. Alamouti,et al.  A simple transmit diversity technique for wireless communications , 1998, IEEE J. Sel. Areas Commun..

[6]  Mahesh K. Varanasi,et al.  Diversity order gain for narrow-band multiuser communications with pre-combining group detection , 2000, IEEE Trans. Commun..

[7]  Gregory E. Bottomley,et al.  Jakes fading model revisited , 1993 .

[8]  A.R. Calderbank,et al.  Applications of space-time block codes and interference suppression for high capacity and high data rate wireless systems , 1998, Conference Record of Thirty-Second Asilomar Conference on Signals, Systems and Computers (Cat. No.98CH36284).