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Multi-antenna techniques offer significant capacity benefits. But realizing these gains in practical wireless systems remains a very challenging problem. MIMO-OFDM has been used in wireless LAN systems with great success. However, due to the largely varying spatial profiles and velocity patterns of the access terminals, integrating MIMO techniques in a wireless WAN system has been a difficult design problem. This paper overviews the multi-antenna techniques used in evolved 3G wireless communications systems, such as 3GPP2 Ultra-Mobile Broadband (UMB), IEEE Mobile Broadband Wireless Access (MBWA) and 3GPP LTE, which are poised to become the successor of 3G systems, e.g., 3GPP2 1xEVDO and WCDMA, as the next generation of high speed wireless system.
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