认知网络中的多用户MIMO线性协作频谱感知问题研究  

Research on the multiuser MIMO linear cooperative spectrum sensing in cognitive radio networks

作　　者：黑永强[1] 李晓辉[1] 李文涛[2] 

机构地区：[1]西安电子科技大学综合业务国家重点实验室,陕西西安710071 [2]西安电子科技大学天线与微波技术国家重点实验室,陕西西安710071

出　　处：《通信学报》2012年第2期45-52,共8页Journal on Communications

基　　金：国家自然科学基金资助项目(61101069);中央高校基本科研业务费专项基金资助项目(K50511010016);高等学校学科创新引智计划基金资助项目(B08038);国家重点实验室专项基金资助项目(ISN03080005);下一代宽带无线移动通信网络国家重大专项基金资助项目(2009ZX03003-005)~~

摘　　要：研究了多用户MIMO的线性协作频谱感知问题以提高频谱检测的可靠性,推导了多用户MIMO线性协作感知系统的局部检测和全局检测策略,建立了在给定误警概率的情况下控制中心通过优化给各个用户的信号所分配的权值来最大化全局检测概率的优化模型。进一步,引入了遗传算法来求解上述全局检测优化问题的最优权值,期望能够有效降低算法在频谱感知过程中检测时间。仿真结果表明,多入多出能够明显提高协作频谱感知系统频谱检测可靠性,而遗传算法高效且稳定,相比较其他算法能够有效改善系统的检测性能。The multiuser MIMO based linear cooperative spectrum sensing problem was investigated in cognitive radio system to improve the reliability of spectrum sensing. Both the local spectrum detecting strategy and global spectrum de- tecting strategy for multiuser MIMO based linear cooperative spectrum sensing system were derived. Then the optimiza- tion model that the different weights assigned on the receive signals of each user at the fusion center for global decision were optimized to maximize the detection probability given a targeted probability of false alarm is established. Further- more, genetic algorithm （GA） was introduced to find the optimal weight vector of the above-mentioned cooperative spec- trum sensing problem, with the purpose of reducing the sensing time in the spectrum sensing process. The simulation re- suits show that, the reliability of spectrum sensing in cooperative spectrum sensing system can be efficiently enhanced with multiple antennas. Besides, the proposed GA method is efficient and stable, and achieves better detection performance when compared with the existing methods.

关 键 词：多入多出 认知无线电 协作 频谱感知 

分 类 号：TP929.5[自动化与计算机技术]