中文摘要：

针对短突发信号的载波同步问题，该文提出联合旋转平均周期图和解调软信息的载波估计算法。该算法首先对导频信息旋转不同频偏，利用平均周期图法进行载波粗估计，然后以解调软信息的最大均方软输出为准则，采用分步式搜索进一步进行载波细估计。仿真结果表明该联合算法在导频开销较小的条件下，误码性能接近最佳相干解调性能，且复杂度较低，频偏估计范围可以达到士50％的符号速率。当误比特率为10-2-10-4时，信噪比损失在0．3dB内。

英文摘要：

For the carrier synchronization in short burst communication system, a joint Rotational Periodogram Averaging （RPA） and demodulation soft information carrier estimation algorithm is proposed. First, the pilot sequence is rotated with different frequency offsets, and the coarse carrier estimation is carried out with periodogram averaging method. Then, further fine estimation is done by stepwise search. The precise carrier synchronization parameters are obtained based on the criterion of Maximum-Mean-Square Soft Output （M2S20）. Simulation results show that the proposed algorithm with short pilots and lower complexity can achieve a BER performance which is very near that of the optimal coherent demodulation and eliminate large carrier offsets as much as plus and minus half of the data rate. When Bit Error Rate （BER） is in the region of 10 2 N 10.4 , the Signal-to-Noise Ratio （SNR） degradation is within 0.3 dB.