低复杂度的TDMA开环载波相位同步算法

研究了一种实用的开环载波相位估计算法。首先，应用QLBAR算法对QPSK信号进行相位估计，然后采用双ROM算法消除相位模糊抖动，经过算法改进后，系统的误比特率性能得到提高，并大大降低了运算复杂度，从而得到一种实用的开环载波相位估计算法。对改进前后的算法进行了性能仿真，在误码率为5×10-2时，信噪比比改进前降低了约1.5 dB。对于具有低复杂度和开环结构要求的星上解调来说，具有重要的实用价值。

Low-complexity open loop carrier phase synchronization algorithm for TDMA

This paper makes a search on an applied algorithm for open loop carrier phase estimation. First, it makes a phase estimation to QPSK signal by using QLBAR algorithm, then adopts double ROM to eliminate phase equivocation. It can get a better performance of bit error rate and reduce the complexities depending on this improved algorithm. So, it is an applied algorithm for open loop carrier phase estimation. This paper gives the emulation to the algorithm improved and unimproved. As the result show, if the bit error rate is 5×10-2, the SNR can be lower than the one unimproved at about 1.5 dB. It has important applied value to the demodulation on board, which requires a low complexities and open configuration.