一种基于子空间分解的认知MIMO传输机制

doi:10.3969/j.issn.1000-3428.2012.20.001

计算机工程 ›› 2012, Vol. 38 ›› Issue (20): 1-3. doi: 10.3969/j.issn.1000-3428.2012.20.001

一种基于子空间分解的认知MIMO传输机制

朱世磊，任丙印，王大鸣，仵国锋

(解放军信息工程大学信息工程学院，郑州 450002)

收稿日期:2012-03-06 修回日期:2012-03-27 出版日期:2012-10-20 发布日期:2012-10-17
作者简介:朱世磊(1987－)，男，硕士研究生，主研方向：无线与移动通信，认知MIMO技术；任丙印，硕士研究生；王大鸣，副教授、博士；仵国锋，讲师、博士
基金资助:
国家“863”计划基金资助项目(2009AA011504)；国家科技重大专项基金资助项目(2011ZX03003-003-02, 2009ZX03003-008-02)

A Transmission Mechanism in Cognitive MIMO Based on Subspace Decomposition

ZHU Shi-lei, REN Bing-yin, WANG Da-ming, WU Guo-feng

(Institute of Information Engineering, PLA Information Engineering University, Zhengzhou 450002, China)

Received:2012-03-06 Revised:2012-03-27 Online:2012-10-20 Published:2012-10-17

摘要/Abstract

摘要：

针对传统认知无线电中检测-避免机制无法保证认知用户通信质量的问题，利用多输入多输出(MIMO)在空域处理上的优势，提出一种基于子空间分解的认知MIMO传输机制。在信道检测阶段，通过对协方差矩阵进行子空间分解得到噪声空间，在数据传输阶段，结合预编码将发送信号投影到噪声空间上，并采用功率注水以优化系统性能。仿真结果表明，该算法可以实现认知用户与主用户的空间复用，有效地提高系统的频谱利用率。

关键词: 认知多输入多输出(MIMO), 子空间分解, 传输机制, 预编码, 注水定理, 最小描述长度估计

Abstract:

Aiming at the problem that the Cognitive User(CU) communication quality can not be ensured in the detect-avoid transmission mechanism of traditional Cognitive Radio(CR) system, a subspace decomposition based transmission mechanism is proposed, in which the advantage of Multiple Input Multiple Output(MIMO) about spatial processing is utilized. The noise space is calculated by using subspace decomposition of covariance matrix during the channel detection. The transmit signal is projected into the noise space combining precoding and the system performance is optimized by power waterfilling during the data transmitting. Simulation result shows that the proposed algorithm can realize the spatial multiplexing between the CU and Primary User(PU), in which the frequency spectrum utilization is enhanced effectively.

Key words: cognitive Multiple Input Multiple Output(MIMO), subspace decomposition, transmission mechanism, precoding, waterfilling theory, Minimum Description Length(MDL) estimation

中图分类号:

TN925

朱世磊, 任丙印, 王大鸣, 仵国锋. 一种基于子空间分解的认知MIMO传输机制[J]. 计算机工程, 2012, 38(20): 1-3.

SHU Shi-Lei-?, LIN Bing-Yi, WANG Da-Ming, WU Guo-Feng. A Transmission Mechanism in Cognitive MIMO Based on Subspace Decomposition[J]. Computer Engineering, 2012, 38(20): 1-3.

http://www.ecice06.com/CN/Y2012/V38/I20/1

参考文献

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