Adaptive Array Beamforming Diversity/Equalization and Cochannel Interference Cancellation for Sectored Wireless Communication Systems

• Main Authors: Ming-Hung Kao, 高銘鴻
• Other Authors: Ta-Sung Lee
• Format: Others
• Language: en_US
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/11624427263815293301

碩士 === 國立交通大學 === 電信工程系 === 87 === A beamspace-time processor is proposed for cochannel interference (CCI) suppression and channel equalization in a sectored wireless communication environment. The scheme involves two stages. Firstly, a set of adaptive beamformers encompassing a prescribed sector is constructed on an antenna array, each providing effective suppression of out-of-sector CCI and reception of in-sector desired signals. Secondly, blind channel equalization is performed to eliminate the inter-symbol-interference (ISI) with a space-time joint processor operating on the output from the set of beamformers. By selecting a few receive beams in the sector, the dimension of the space-time data is greatly reduced, rendering advanced algorithms of channel estimation a feasible solution. For well separated multipath scenarios, a space-only processor is proposed for nulling out the ISI. Through simulation examples, it is shown that the proposed low complexity processor provides an effective joint suppression of ISI and CCI, and exhibits robustness against environmental variations.