Controllable single accumulated state-sequential acquisition with low signal noise ratio

作     者：JI Jiang HUANG KaiZhi JIN Liang ZHANG LiZhi ZHANG Meng 

作者机构：National Digital Switching System Engineering & Technological Research Center Zhengzhou 450002 China 

出 版 物：《Science in China(Series F)》 (中国科学（F辑英文版）)

年 卷 期：2009年第52卷第5期

页      面：858-866页

核心收录：

学科分类：0810[工学-信息与通信工程] 081801[工学-矿产普查与勘探] 081802[工学-地球探测与信息技术] 08[工学] 0818[工学-地质资源与地质工程] 081001[工学-通信与信息系统] 

基　　金：Supported by the Program for New Centery Excellent Talents in University and the National High-Tech Research and Development Program of China (Grant No. 2007AA01Z434) 

主　　题：pseudo-noise (PN) sequence single accumulated state sequential acquisition control state 

摘      要：The sequential estimation （SE） algorithm has a poor performance in the environment with a low signalto-noise ratio （SNR） and a high bit error rate （BER）, especially for unknown initial acquisition sequence. This paper summarizes the conventional sequence acquisition model, and discovers its several problems, which are caused by accumulating sequence innovation to all of the received sequences dispersedly. To solve these problems, the paper presents a new algorithm, CSAS-SA （controllable single accumulated state-sequential acquisition）. This algorithm accumulates the sequence innovation to a single appointed sequence state and makes the useful information accumulated effectively. Through simulation, CSAS-SA has a higher probability of success acquisition. When SNR equals -3 dB, the performance can be improved by 70%.