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。
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.
出处
《机电工程》
CAS
2010年第3期117-119,共3页
Journal of Mechanical & Electrical Engineering
基金
浙江省研究生创新科研资助项目(YK2008057)
关键词
宽带码分多址信号
四阶矩切片
信号检测
低信噪比
wideband code-division multiple access（WCDMA） signal
fourth-order moment chip
signal detection
lower signal to noise ratio （ SNR ）
