SOQPSK信号位定时与载波联合估计算法

SOQPSK Timing Signal and Carrier Joint Estimation Algorithm

针对在极低信噪比、大多普勒频偏环境,研究了SOQPSK信号的位定时、载波频率和相位联合估计算法。该算法运用了Laurent分解原理以减少匹配滤波器个数,位同步信息的提取与接收译码均可共用前端的匹配滤波器,进一步降低接收端复杂度。同时,该算法的同步信息的提取方法也是低复杂度的。计算机仿真结果表明,该算法能够在低信噪比、大频偏条件下,以较低的低复杂度实现同步信息提取,且同步性能良好。

Aiming at the environment with very low signal-to-noise ratio and big Doppler frequency offset, the bit timing, carrier frequency and phase joint estimation algorithm of SOQPSK signal are discussed in this paper. Laurent decomposition principle is used in the estimation algorithm for reducing the number of matched filters, and both the extraction of bit synchronous information and the receiving decode could com- monly share the front-end matching filters, thus to further decrease the receiver complexity. Additionally, the synchronous information extraction method of this algorithm is also of low complexity. Simulation results show that this algorithm could implement the extraction of synchronization information under the condition of low SNR and large frequency with a relatively low complexity, and also maintain a fairly good performance.