BOC(10,5)与BPSK(10)信号的同步性能研究

Research on Synchronization Performance of BOC(10,5) and BPSK(10) Signal

BOC调制方式在卫星通信中的应用已十分普遍,文章以在GPS上应用的BOC(10,5)与BPSK(10)信号为例,首先判定了把CRB(克拉美罗界)作为同步精度标准的原因,用修改的MCRB代替CRB,来去除扩频序列对CRB的影响。从理论上得到了BOC的同步方差下限小于BPSK的方差下限。通过仿真,得出了其方差在不同信噪比下的表现。搭建了通信仿真系统,得出了在不同信噪比下BOC和BPSK的捕获概率和同步精度,证明了BOC拥有更好的同步性能。

Binary-offset-carrier technology has been widely applied in the satellite communication. This paper focuses attention on BOC(10,5) and BPSK(10), which has been adopted in GPS. First, the reason why CRB is considered the measurement of synchronous precision has been confirmed. CRB has been replaced by MCRB to discard the effect of the spread spectrum sequence. The result has been concluded which the low band of BOC's synchronous variance is lower than BPSK's in theory.Second, the performance of variance can be educed in different SNR due to simulation contribution. Finally, the simulation system of communication has been established to try to compared the capture probability and synchronous precision of BOC and BPSK, and to prove a better performance of BOC.