混合多址中一种伪码捕获算法的性能分析

提出了一种混合多址系统伪码捕获的实现结构,并且与几种经典结果进行了性能比较,结果表明这种方法具有一定优越性.该结构主要是采用频域并行处理作为伪码相关器,通过控制载波NCO频率消除载波频偏对伪码捕获的影响,并且根据自适应门限准则基本消除了输入信号波动对检测性能的影响,又根据恒虚警概率准则满足了对输入信噪比的大动态范围要求.文中提供了详细的推导公式,推导出了该结构下各性能指标较为简约的计算公式,方便读者理解和应用.另外还给出了这种混合多址系统伪码捕获实现结构仿真结果并通过了Monte Carlo实验验证.

A PN-Code Acquisition Method in Mixed Multiple Access System and Its Performance Analysis

This paper introduces the realization of a PN acquisition scheme in burst DSSS communication,which is compared with traditional classical methods and attains a better result.This design uses a parallel-processing in frequency domain as the PN-Code correlator.The influence of carrier wave offset on the PN-Code acquisition is eliminated through controlling the carrier wave NCO frequency,and the influence of input signal fluctuation on the acquisition performance is removed by auto adaptive threshold criterion.It uses the constant false-alarm time criterion to meet the requirement of large range of the input SNR.This paper gives mathematics calculation in detail and the contracted mathematic expression of performance index is also deduced from this scheme for readers' understanding and applying.In addition this paper also introduces the simulation result and it is testified through Monte Carlo method.