QQ客服 官方微博 反馈留言

	低信噪比直扩信号扩频码的盲估计方法
	张天骐 ; 林孝康 ; 周正中 ; ZHANG Tianqi ; LIN Xiaokang ; ZHOU Zhengzhong
	2010-06-07 ; 2010-06-07
关键词	无线通信 卡洛(K-L)变换 直接序列扩频(DS/SS或DS)信号 扩频码(伪噪声码或PN码)序列 盲解扩 wireless communication Karhunen-Lo鑦e (K-L) transformation direct sequence spread spectrum (DS/SS) signal pseudo noise (PN) sequence spread-spectrum despreading without the code TN914.4
其他题名	Approach to blind estimation of PN spreading sequence in lower SNR DS/SS signals
中文摘要	为了解决低信噪比直扩信号扩频码的盲估计问题,提出了一种直扩信号的协方差矩阵累加平均和离散卡洛(Karhunen-Loève,K-L)变换的方法。该方法是在已知直扩信号的扩频码周期、码速率等参数的前提下,将接收到的直扩信号以一随机确定值为起点进行周期分段以形成连续多个观察向量,求协方差矩阵并累加平均,实施离散K-L变换以得到信号所含主成分,由主成分特征向量估计观察信号的扩频码。而后对观察信号进行解扩处理,从而实现直序扩频信号的盲解扩处理。理论分析和数值结果表明了该方法非常鲁棒不易受噪声影响,在通常情况下可以工作于低于-20dB信噪比的环境下。; An approach was developed using covariance matrix accumulation and the Karhunen-Lo鑦e (K-L) transformation for DS/SS signals to blindly estimate the pseudo noise (PN) sequence in low signal to noise ratio (SNR) DS/SS signals. The parameters of the DS/SS signals (such as the period and chip interval of the PN sequence) need to be known. The received signals were divided into vectors based on the PN sequence period with the starting point of the division being randomized points uniformly distributed in a PN sequence period. Then the covariance matrix of the signal vectors was analyzed using the K-L transformation. The PN sequence of the DS/SS signals was then blindly estimated from the main component eigenvector. The estimated PN sequence can be used to calculate the DS/SS signal despreading without the PN sequence. Theoretical analyses and test results show that the approach is very robust, working well on SNR below -20 dB in normal circumstances.; 清华大学深圳研究生院博士后基金资助项目(023100012)
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/45628]
专题	清华大学
推荐引用方式 GB/T 7714	张天骐,林孝康,周正中,等. 低信噪比直扩信号扩频码的盲估计方法[J],2010, 2010.
APA	张天骐,林孝康,周正中,ZHANG Tianqi,LIN Xiaokang,&ZHOU Zhengzhong.(2010).低信噪比直扩信号扩频码的盲估计方法..
MLA	张天骐,et al."低信噪比直扩信号扩频码的盲估计方法".(2010).

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。