ISSN : 1796-2021
Volume : 4    Issue : 1    Date : February 2009

Multi-Antenna Techniques for Evolved 3G Wireless Communication Networks: An Overview
Michael Mao Wang, Andy Wang, Alexei Gorokhov, Tamer Kadous, and Min Dong
Page(s): 61-69
Full Text:
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Multi-antenna techniques offers 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. This paper uses MIMO in various forms to suit the deployment scenario. Although we use
UMB as a design paradigm in this paper, most of the results apply to OFDM systems in general.

Index Terms
OFDMA, Multi-antenna transmission, MIMO, spatial multiplexing, rank predication, SDMA, precoding,
MMSE receiver, MMSE-SIC receiver, Ultra Mobile Broadband (UMB).