计算机工程

• 移动互联与通信技术 • 上一篇    下一篇

存在信道相关时V-BLAST OFDM系统的功率分配算法

陈小敏a,b,苏君煦a,谭伟a,朱益民a,朱秋明a,b   

  1. (南京航空航天大学 a.电子信息工程学院; b.江苏省物联网与控制技术重点实验室 南京210016)
  • 收稿日期:2015-06-16 出版日期:2016-09-15 发布日期:2016-09-15
  • 作者简介:陈小敏(1979-),女,副教授、博士,主研方向为无线通信、空时编码信号检测、链路自适应技术;苏君煦、谭伟、朱益民,硕士研究生;朱秋明,副教授、博士。
  • 基金项目:
    国家自然科学基金资助面上项目(61172078);中国博士后科学基金资助项目 (2013M541661);航空科学基金资助项目(20120152001)。

Power Allocation Algorithm for V-BLAST OFDM Systems with Channel Correlation

CHEN Xiaomin  a,b,SU Junxu  a,TAN Wei  a,ZHU Yimin  a,ZHU Qiuming  a,b   

  1. (a.College of Electronic and Information Engineering; b.Jiangsu Key Laboratory of Internet of Things and Control Technologies,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
  • Received:2015-06-16 Online:2016-09-15 Published:2016-09-15

摘要: 针对存在信道相关及信道估计误差的V-BLAST OFDM系统,提出一种以误比特率为优化目标的自适应功率分配算法。采用基于波束成形的去相关方法降低系统相关性以提升系统性能。发送端在总功率约束条件下,以瞬时误比特率(BER)为优化目标,采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,该算法结合去相关方法可提升V-BLAST OFDM系统的BER性能,且随着信噪比的增大,性能提升明显。

关键词: 自适应功率分配, 信道相关, 估计误差, 误比特率, 正交频分复用

Abstract: For Vertical-Bell Labs layered Space-time Orthogonal Frequency Division Multiplexing (V-BLAST) system with channel correlation and channel estimation error,this paper proposes an adaptive Transmit Power Allocation(TPA) algorithm to minimize Bit Error Rate(BER).A decorrelation method based on beam-forming technique is employed in the presence of deteriorative correlation.At the transmitter,the power allocation matrix is calculated by using the Lagrange multiplier method with the total TPA constraint condition.Simulation results show that the proposed TPA algorithm combined with the decorrelation method can improve the BER performance effectively for the actual communication system.With the increase of the signal to noise ratio,the improvement of the performance is more obvious.

Key words: adaptive power allocation, channel correlation, estimation error, Bit Error Rate(BER), Orthogonal Frequency Division Multiplexing(OFDM)

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