P-SCDMA系统扩频序列的捕捉方案及理论分析

Parameter Analysis of Spread-Spectrum Sequence Acquisition in P-SCDMA System

提出了包交换同步码分多址 P- SCDMA(Packet- Switch- Synchronous Code Division Multiple Ac-cess)系统的扩频序列的捕捉方案 ,该方案采用 I- Q匹配滤波器实现扩频码的同步 ,并从理论上对捕捉方案进行了分析 ,得出了系统捕捉总概率和捕捉时间低限。仿真结果表明最坏分布情况下 ,捕捉时间对单元捕捉概率敏感程度较均匀分布情况下大 ;均匀分布情况下的最终捕捉概率较最坏分布情况下大。 I- Q匹配滤波器捕捉结构的分析同样适用于其他直接扩频通信系统 ,比如 IS-

Based on the spread spectrum code acquisition scheme of P SCDMA (Packet Switch Synchronous Code Division Multiple Access), the paper sets up a signal model by adopting I Q matched filter and theoretically analyzes parameters of the acquisition system with the statistical result of general acquisition probability and minimum acquisition time in the system. Figures of false alarm probability versus EC/NO and detection probability versus EC/NO are presented and the results under different conditions are obtained. This method of analysis on I Q matched filter can also be used in any other fast acquisition system, such as in IS 95.