酉变换在准闭环发射分集系统中的应用

Conference Record of the Thirty-Fourth Asilomar Conference on Signals, Systems and Computers (Cat. No.00CH37154) Pub Date : 2000-10-29 DOI:10.1109/ACSSC.2000.910924

G. Mandyam

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引用次数: 1

摘要

移动无线通信系统以前的工作集中在使用闭环发射分集来提高衰落信道的性能。闭环发射分集方法利用最优加权向量的反馈对多天线的发射信号进行预加权，存在两个问题:(1)在高移动速度下，由于反馈速率有限而导致信号退化;(2)随着发射天线数量的增加，反馈信息率不断增加。基于对发射机分集使用酉变换，提出了一种解决上述两个问题的闭环发射分集方法。

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Application of unitary transforms to quasi-closed-loop transmit diversity systems

Previous work in mobile wireless communications systems has centered on the use of closed-loop transmit diversity to increase performance in fading channels. Closed-loop transmit diversity methods, which employ feedback of optimal weighting vectors so as to pre-weight transmitted symbols from multiple antennas, suffer from two problems: (1) degradation at high mobile velocities due to limited-rate feedback, and (2) increasing feedback information rate with increasing number of transmit antennas. A method of closed-loop transmit diversity which addresses both of the problems listed above is presented based on the use of unitary transformations for transmitter diversity.

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Conference Record of the Thirty-Fourth Asilomar Conference on Signals, Systems and Computers (Cat. No.00CH37154)

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