MIMO systems with adaptive modulation

被引：123

作者：

Zhou, ZD ^{[1
]}

Vucetic, B

Dohler, M

Li, YH

机构：

[1] Univ Sydney, Sch Elect & Informat Engn, Sydney, NSW 2006, Australia

[2] Kings Coll London, Ctr Telecommun Res, London WC2R 2LS, England

来源：

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY | 2005年 / 54卷 / 05期

基金：

澳大利亚研究理事会;

关键词：

adaptive modulation (AM); channel state information (CSI); multiple input multiple output (MIMO) systems;

D O I：

10.1109/TVT.2005.853886

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Adaptive modulation (AM) schemes in multiple input multiple output (MIMO) systems with a perfect or imperfect channel state information (CSI) at both the transmitter and receiver were investigated. Under an average transmit power and instantaneous bit error rate (BER) constraint, the transmit parameters including the subchannel transmit power and/or spectral efficiency are optimally adapted in the spatial and/or temporal domain to maximize the average spectral efficiency (ASE). Two categories, the continuous rate and discrete rate, of adaptive systems were considered, where the derived asymptotic closed form expressions for the former provided much insight into the latter. Analytical and numerical results showed that a full multiplexing gain was achieved in variable rate variable power (VRVP) systems and variable rate (VR) systems. Variable power (VP) systems with unequal numbers of transmit and receive antennas also achieved the full multiplexing gain, unlike VP systems with equal number of transmit and receive antennas. The effect of CSI imperfection on the ASE and BER was evaluated for VR systems and closed form expressions for the ASE and BER were obtained. They prove to be a useful tool to assess the system performance without taking time consuming AM MIMO system simulations.

引用

页码：1828 / 1842

页数：15

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