CDMA系统序列捕捉中的双截断序贯似然比检测

Double Truncated Sequential Probability Ratio Test for Sequence Acquisition in CDMA Systems

本文研究ＤＳ／ＣＤＭＡ系统中的序列捕捉问题，介绍了一种双截断序贯似然比检测判决（ＤＴＳＰＲＴ）算法及一种基于状态图的ＤＴＳＰＲＴ性能分析方法。文中给出了ＤＴＳＰＲＴ算法各主要参数的计算公式和参考取值范围。理论分析和计算机仿真结果均表明，ＤＴＳＰＲＴ应用于ＤＳ／ＣＤ－ＭＡ系统可节省平均捕捉时间，提高捕捉性能。

This paper presents a detection algorithm,named double truncated sequential probability ratio test (DTSPRT),for the sequence acquisition in DS/CDMA systems,and proposes a method for evaluating DTSPRT performance using the state transition diagram.Equations and proposed ranges of values for the major parameters of DTSPRT are developed and computer simulations are performed.The results show that DTSPRT,when used in DS/CDMA systems,can reduce the mean acquisition time and improve the performance with moderate complexity of implementation.