摘要
本文研究了MIMO系统中的功率分配技术.针对基于ZF/MMSE检测的MIMO系统,提出了一种简单的自适应功率分配方案.该方案在不使用预编码技术对MIMO信道进行对角化的前提下,遵循最小化系统BER的准则,为发送数据流分配发射功率.与采用SVD预编码的功率分配方案相比,本文提出的方法减少了系统需要的反馈信息量.仿真表明该方法能够有效地提高系统的BER性能,而且基于MMSE检测的系统性能接近于采用SVD预编码的功率分配性能.
This paper investigates the power allocation schemes for MIMO systems. An effective power allocation method for ZF/MMSE detected MIMO systems is then proposed. The method is designed to minimize the overall systems BER performance without pre-diagnalizing the MIMO channels using precoding. Compared with conventional power allocation schemes using SVD, the proposed method reduces the required feedback information. Simulation results show that this method effectively improves the BER performance. Moreover, the performance of this new method is also close to that of conventional precoded MIMO systems.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2008年第10期1891-1896,共6页
Acta Electronica Sinica
基金
国家973重点基础研究发展规划(No.2007CB310603)
国家863高技术研究发展计划(No.2006AA01Z263)
关键词
MIMO
自适应功率分配
最小均方误差检测
最小化误码率
multiple input and multiple output(MIMO)
adaptive power allocation
minimum mean square error(MMSE) detection
minimum bit error rate(BER)