CAJ | 학술논문

　　编码辅助载波同步算法充分利用译码软信息，可获得较理想的同步性能，但是目前这类算法存在复杂度高、处理时间长的问题。首先在推导迭代载波同步中后验均值与译码软信息关系的基础之上，通过选择性地进行译码判决反馈来减少不必要的计算点数，再根据前两次的迭代结果自适应地减小频率搜索区间长度，从而大幅降低同步参数估计的运算量。仿真结果表明，该算法能够有效工作在低信噪比环境下，可获得接近理想同步条件下的译码性能。
　　편마보조재파동보산법충분이용역마연신식，가획득교이상적동보성능，단시목전저류산법존재복잡도고、처리시간장적문제。수선재추도질대재파동보중후험균치여역마연신식관계적기출지상，통과선택성지진행역마판결반궤래감소불필요적계산점수，재근거전량차적질대결과자괄응지감소빈솔수색구간장도，종이대폭강저동보삼수고계적운산량。방진결과표명，해산법능구유효공작재저신조비배경하，가획득접근이상동보조건하적역마성능。
The code-aided(CA)carrier synchronization algorithm exploits soft decoding information introduced by the decoder to gain the ideal synchronization performance. But the algorithm performs high complexity and long delay. In this paper,the relation between posterior average values and soft decoding information in iterative car-rier synchronization is derived and unnecessary calculating points are reduced by using selective soft decision feedback. Then the length of frequency search interval is decreased adaptively according to the previous two iter-ative results. So the computational complexity of the estimation of synchronization parameters is reduced greatly. The simulation results demonstrate that this algorithm can work efficiently at low signal to noise ratio (SNR), and almost perfect synchronization decoding performance is achieved.