长码直扩信号的伪码参数及序列的估计方法

针对长码直扩信号的盲估计问题，将相关函数二阶矩方法、最大范数法和特征值分解方法应用于扩频周期、同步偏移、符号周期和PN码序列的估计中。根据长码直扩信号的特点，对各种估计方法进行了分析，得出了与短码直扩信号不同的结论，并提出了长码直扩信号的参数估计和PN码序列估计方法。计算机仿真实验验证了所提出的方法的有效性。

Algorithms for parameters and sequence estimation of the PN code in long code DS-SS signals

To investigate the parameters and sequence estimation of the PN code in long code direct sequence spread spectrum (DS-SS) signals, the algorithms including the second order moment of the autocorrelation estimator, the maximum norm approach and matrix eigenvalue decomposition are introduced. New results are deduced for long code DS-SS signals in contrast to short code ones. The methods for estimation of the PN code period, timing offset, symbol period and spread spectrum sequence are proposed. Simulation results show the efficiency of the proposed methods.