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存在信道相关及估计误差时V-BLAST系统的功率分配算法 被引量：4

Power Allocation Algorithm for Correlated V-BLAST System with Channel Estimation Error
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摘要 针对信道相关及存在信道估计误差的垂直分层空时(Vertical bell lab layered space-time,VBLAST)系统,提出以最小化误比特率(Bit error rate,BER)为优化目标的自适应功率分配算法。通过系统建模和性能分析,由接收信号子流的瞬时信干噪比(Signal-to-interference-plus-noise ratio,SINR),推导出系统子流的平均BER闭式表达式。发送端在总功率约束条件下,以瞬时BER为优化目标,利用拉格朗日极值法得到自适应功率分配矩阵。仿真结果表明,信道相关及估计误差对V-BLAST系统的BER性能有极大影响,采用所提算法可显著改善系统的BER性能并更具实用性。 An adaptive transmit power allocation （TPA） scheme to minimize bit error rate （BER） is in- vestigated in a vertical bell labs layered space-time （V-BLAST） system with channel correlation and esti- mation error. The closed expression for average BER can he derived according to the instantaneous sig- nal-to-interference-plus-noise ratio （SINR） of each sub-stream by system modeling and performance anal- ysis. At the transmitter, with the total TPA constraint condition, TPA matrix is calculated through the Lagrange multiplier method. Numerical results demonstrate that the correlation structure and channel estimation error have a profound effect on the performance of V-BLAST system. The proposed TPA scheme can improve the BER performance effectively and be practical for the actual communication system.
作者 谭伟 陈小敏 朱益民 朱秋明 党小宇
机构地区 南京航空航天大学电子信息工程学院 雷达成像与微波光子技术教育部重点实验室
出处 《数据采集与处理》 CSCD 北大核心 2015年第3期571-577,共7页 Journal of Data Acquisition and Processing
基金 中国博士后科学基金(2013M541661)资助项目 航空科学基金(20120152001)资助项目 国家自然科学基金(61172078)资助项目 江苏高校优势学科建设工程资助项目
关键词 信道相关 垂直分层空时 估计误差 误比特率 自适应功率分配 channel correlation V-BLAST estimation error bit error rate （BER） adaptive power allo-cation
分类号 TN911 [电子电信—通信与信息系统]
  • 相关文献

参考文献12

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二级参考文献10

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共引文献2

同被引文献45

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数据采集与处理
2015年 第3期

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