电波科学学报2016，Vol.31Issue(6)：1113-1123,11.DOI:10.13443/j.cjors.2016030201
基于最小二乘的同步多用户非周期长码直扩信号扩频序列估计
Estimation of the spread spectrum sequence for synchronous multi-user aperiodic long-code DSSS signals based on least squares
摘要
Abstract
This paper studies the problem of estimation of the spread-spectrum sequence for low SNR synchronous multi-user long-code direct sequence spread spectrum (DSSS) signals.An estimation approach of spread-spectrum sequence based on a nested iterative least squares with projection (NILSP) algorithm is presented.First,The synchronous multi-user long-code DSSS signals is constructed as the shortcode ones with missing data.Then the mathematical analysis for the short-code ones with missing data is done based on the theory of maximum likelihood estimation (MLE) to establish a mathematical model of spread-spectrum sequence.After that,the spread-spectrum sequence is estimated by a NILSP algorithm.The theoretical analysis and simulations show that,the proposed algorithm always has a good performance for estimation of multi-users' (more than 10 users) spread-spectrum sequence in low-SNR (lower than-10 dB) scenarios,and under the same conditions,the longer the data size,the better the performance.关键词
长码直扩信号/缺失数据模型/最大似然估计/嵌套迭代最小二乘投影算法Key words
long-code direct sequence spread spectrum (DSSS) signals/missing data model/maximum likelihood estimation(MLE)/nested iterative least squares with projection (NILSP)分类
信息技术与安全科学引用本文复制引用
张天骐,强幸子,马宝泽,王俊霞..基于最小二乘的同步多用户非周期长码直扩信号扩频序列估计[J].电波科学学报,2016,31(6):1113-1123,11.基金项目
国家自然科学基金(61671095,61371164,61275099) （61671095,61371164,61275099）
信号与信息处理重庆市市级重点实验室建设项目(CSTC2009CA2003) （CSTC2009CA2003）
重庆市教育委员会科研项目(KJ130524,KJ1600427,KJ1600429) （KJ130524,KJ1600427,KJ1600429）
