认知信号在多径信道中频谱成形的优化方法  

Scheme of optimizing cognitive signal by using spectrum shaping in multipath fading communication channels

作　　者：李滔[1] 徐家品[1] 

机构地区：[1]四川大学电子信息学院,四川成都610064

出　　处：《信息与电子工程》2012年第2期178-183,共6页information and electronic engineering

摘　　要：针对认知信号在多径衰落信道中发生畸变而导致通信质量急剧降低的问题,本文根据信息论和通信原理知识,提出了一种对认知信号采用频谱成形技术实现优化的新方法,使认知信号的传输速率与通信质量得以提高。最后通过仿真实验与无频谱成形情况对比,证实了该优化方法确实能够减小多径衰落信道对认知信号的影响,提高了认知信号传输速率和质量。Signals transmitting in the multipath channels are usually disturbed by multipath interference.Therefore,the signal received in the receiver deforms,and the communication quality in the channel slumps dramatically.In this paper,one kind of optimization method involving in spectrum shaping of cognitive signal is proposed by comparison with the signal without spectrum shaping,according to the related knowledge of information theory.It can be justified theoretically that the new approach improves the information transmission rate and communication quality significantly in the practical communication channels.Besides,the simulation result further confirms that the method of spectrum shaping plays an important role in improving the quality and transmission rate of cognitive signal in the multipath channel.

关 键 词：认知信号 多径干扰 频谱成形 优化方法 

分 类 号：TN925[电子电信—通信与信息系统]