一种CDMA2000系统的PN码初始捕获算法

A PN Acquisition Scheme in CDMA2000 Spread Spectrum Systems

文中依据CDMA2000物理层标准,提出了一种针对移动台下行同步的伪噪声(PN)码相位捕获算法。本算法利用部分匹配滤波(PMF)后进行快速傅里叶变换(FFT)实现对PN码相位的可靠捕获,可以应用于有较大的频率偏移和较低的接收信号导频信噪比(Pilot Ec/N 0)的环境下。并进一步对算法进行了性能仿真验证,仿真结果证明了本文算法相对传统差分算法有更好的捕获性能。

This paper proposes a new type of pseudonoise （PN） code acquisition algorithm, which is based on physical layer standard of CDMA2000. The PN acquisition is successfully achieved by partial martch filtering （PMF） followed by Fast Fourier Transform （FFT）. Analysis and simulation indicate that this algorithm could be applied in an environment of frequency offset caused by carrier offset or the Doppler shift, especially when the Pilot Ec/N0 is low, and is of better acquisition performance as compared with the traditional difference algorithms.