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MIMO Link Adaptation in Mobile WiMAX Systems

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3 Author(s)
Muquet, B. ; Sequans Commun., Paris ; Biglieri, Ezio ; Sari, H.

Mobile WiMAX systems are based on the IEEE 802.16e specifications, which include two mandatory MIMO profiles for the downlink. One of these is Alamouti's space-time code (STC) for transmit diversity, and the other is a 2times2 spatial multiplexing MIMO scheme. In this paper, we compare the two schemes assuming that the latter employs maximum-likelihood detection. The analysis shows that at the same spectral efficiency, Alamouti's STC combined with maximum-ratio combining (MRC) at the receiver significantly outperforms the 2times2 spatial multiplexing scheme at high values of the signal-to-noise ratio (SNR). Next, selection of a MIMO option is included in link adaptation to maximize network capacity, and operating SNR regions are determined for different modulation, coding and MIMO combinations.

Published in:

Wireless Communications and Networking Conference, 2007.WCNC 2007. IEEE

Date of Conference:

11-15 March 2007