| 存在信道相关及估计误差时V-BLAST系统的功率分配算法 |
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| 引用本文： | 谭伟,陈小敏,朱益民,朱秋明,党小宇. 存在信道相关及估计误差时V-BLAST系统的功率分配算法[J]. 数据采集与处理, 2015, 30(3): 571-577 |
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| 作者姓名： | 谭伟 陈小敏 朱益民 朱秋明 党小宇 |
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| 作者单位： | 南京航空航天大学电子信息工程学院；南京航空航天大学电子信息工程学院；南京航空航天大学电子信息工程学院；南京航空航天大学电子信息工程学院；南京航空航天大学电子信息工程学院 |
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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,V-BLAST)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。
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| 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 |
Power Allocation Algorithm for Correlated V-BLAST System with Channel Estimation Error |
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| Tan Wei,Chen Xiaomin,Zhu Yimin,Zhu Qiuming,Dang Xiaoyu. Power Allocation Algorithm for Correlated V-BLAST System with Channel Estimation Error[J]. Journal of Data Acquisition & Processing, 2015, 30(3): 571-577 |
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| Authors: | Tan Wei Chen Xiaomin Zhu Yimin Zhu Qiuming Dang Xiaoyu |
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| Affiliation: | College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics;College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics;College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics;College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics;College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics |
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| Abstract: | An adaptive transmit power allocation (TPA) scheme to minimize bit error rate (BER) is investigated in a vertical bell labs layered space-time (V-BLAST) system with channel correlation and estimation error. The closed expression for average BER can be derived according to the instantaneous signal-to-interference-plus-noise ratio (SINR) of each sub-stream by system modeling and performance analysis. 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. |
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| Keywords: | channel correlation V-BLAST estimation error bit error rate (BER) adaptive power allocation |
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