CAJ | 학술논문

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±50%的符号速率。当误比特率为10-2：10-4时，信噪比损失在0.3 dB内。
침대단돌발신호적재파동보문제，해문제출연합선전평균주기도화해조연신식적재파고계산법。해산법수선대도빈신식선전불동빈편，이용평균주기도법진행재파조고계，연후이해조연신식적최대균방연수출위준칙，채용분보식수색진일보진행재파세고계。방진결과표명해연합산법재도빈개소교소적조건하，오마성능접근최가상간해조성능，차복잡도교저，빈편고계범위가이체도±50%적부호속솔。당오비특솔위10-2：10-4시，신조비손실재0.3 dB내。
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 (M2S2O). 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 10-2:10-4 , the Signal-to-Noise Ratio (SNR) degradation is within 0.3 dB.