On strategies of multiuser MIMO transmit signal processing

• Published in: IEEE transactions on wireless communications Vol. 3; no. 6; pp. 1936 - 1941
• Main Authors: Choi, R.L.-U., Ivrlac, M.T., Murch, R.D., Utschick, W.
• Format: Journal Article
• Language: English
• Published: Piscataway, NJ IEEE 01.11.2004; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Antennas; Applied sciences; Channels; Correlation; Decomposition; Downlink; Exact sciences and technology; MIMO; Multiple-input multiple-output (MIMO) systems; multiuser decomposition; multiuser MIMO; Mutual information; Power system modeling; Receiving antennas; Signal processing; Signal processing algorithms; Strategy; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Throughput; Transmission and modulation (techniques and equipments); transmit single processing; Transmitters; Transmitting antennas; Wireless communication; MIMO system; Time division multiple access; Simulation; Wireless telecommunication; Signal processing; Performance analysis; Multiuser channels; System decomposition
• ISSN: 1536-1276; 1558-2248
• DOI: 10.1109/TWC.2004.837636

In this letter, we introduce five different strategies of linear transmit signal processing for multiuser multiple-input multiple-output (MIMO) systems and provide performance comparisons in terms of maximum throughput in both uncorrelated and correlated channels when the number of transmit antennas is much larger than the number of receive antennas. It is shown that the multiuser MIMO schemes are preferable to time-division multiple-access (TDMA)-based MIMO schemes, hence demonstrating the power of multiuser MIMO signal processing. Our work also indicates possibilities for future research in finding efficient suboptimal algorithms. As an example, we show that our multiuser MIMO decomposition scheme can improve the maximum throughput compared to TDMA-based MIMO schemes for large number of transmit antennas or high transmit power.