WCDMA系统中一种前导检测门限算法研究

Study on the threshold algorithm about preamble detection in WCDMA system

在WCDMA系统的前导检测门限算法中,干扰值的估计成为算法的一个关键环节。对工程上常用的一种前导检测门限算法进行了深入的研究,针对算法在小区干扰值较大时,对应的干扰估计值偏小,从而导致前导检测虚警概率较高的问题,将各签名的幅度时延函数(amplitude delay profile,ADP)值的方差引入到干扰值的估计算法中,提出一种改进的前导检测门限算法。实验结果表明,改进算法有效地解决了干扰估计值偏小的问题,降低了前导检测虚警概率。

The estimation of interference value is the key of preamble detection threshold algorithm in the WCDMA system. This paper researched a preamble detection threshold algorithm that was widely used in Engineering in depth. When the cell interference is large, the corresponding interference value estimated was small, and the false alarm probability of preamble detection was higher. To solve this problem we imported the variance of the signed ADP value into algorithm of interference value estimation, and proposed improved preamble detection threshold algorithm. Experimental results show that the improved algorithm has effectively solved the problem that the interference value estimated is small, and reduces false alarm probability of preamble detection.