MSK波形伪码码片跟踪环性能分析

Performance analysis of CTL used for MSK waveform PN code

针对小码片信噪比条件下数据转换跟踪环进行MSK波形伪码时钟恢复时的跟踪性能问题,采用了新型的码片跟踪环用于伪码时钟恢复。分析了不同码片信噪比条件下,数据转换跟踪环和码片跟踪环均方时序抖动性能。仿真结果表明:在大信噪比条件下,数据转换跟踪环与码片跟踪环性能一致;在小信噪比条件下,后者性能明显好于前者。

The data transition tracking loop （DTTL） can not obtain good performance pseudo-noise （PN） timing recovery under the condition of small symbol signal-to-noise ratio （SNR）. To overcome this shortcoming, a novel chip tracking loop （CTL） was adopted. The mean square timing jitter performance of the CTI. and the DTTL for MSK waveform PN code was analyzed in a wide range of symbol SNR. The simulation results show that the same performance can be obtained by the DTTL and the CTL at large symbol SNR environment, while in small symbol SNR environment the performance of the CTL is better than that of the DTTL.