低信噪比下WCDMA信号的盲检测与降耗研究*

作者：赵知劲，濮俊杰，尚俊娜 日期：2010-06-21/span> 浏览：3700 查看PDF文档

低信噪比下WCDMA信号的盲检测与降耗研究*
赵知劲，濮俊杰，尚俊娜
（杭州电子科技大学 通信工程学院，浙江 杭州310018）

摘要：宽带码分多址信号是非周期性信号，由于非周期性扩频码打破了伪码的周期和相关特性，使它淹没在噪声中难以检测。针对宽带码分多址信号的盲检测，利用四阶矩切片对高斯白噪声的良好抑制效果，以及将混噪信号四阶矩切片的时延零点除去后的更优抑噪性能，提出了基于二次四阶矩切片的检测法，使得原本被噪声掩盖的扩频信号凸显出来，并利用一种快速计算方法降低了计算量。研究结果表明，当信噪比为-21 dB时，检测概率仍可达到90%以上，使得在相同噪声影响下，信号发射功率更低。
关键词：宽带码分多址信号；四阶矩切片；信号检测；低信噪比
中图分类号：TN914文献标识码：A文章编号：1001-4551(2010)03-0117-03

Research on the reducing power consumption and the blind
detection of WCDMA signal at lower SNR

ZHAO Zhijin, PU Junjie, SHANG Junna
(School of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310018, China)

Abstract: Wideband code division multiple access signal is nonperiodic signal, which always is flooded in the background noise and breaks the related characteristic and period of the pseudorandom code, bringing difficulties to the signals reconnaissance. In order to detecting this signal, because of the good performance on depressing Gauss noise and the improvement after removing the zero point time delay of the fourthorder moment chip of mixed signal, the detection method based on the quadratic fourthorder moment chip of WCDMA was proposed, and the amount of calculation was reduced by using rapid calculation method about fourthorder moment chip. The result shows that the signal is so obvious to be detected, and the detection probability of presented methods reaches above 90% at signal to noise ratio(-21 dB) and the signal transmitting power is lower under the same noise.
Key words: wideband codedivision multiple access(WCDMA) signal; fourthorder moment chip; signal detection; lower signal to noise ratio(SNR)