摘要
针对高动态低信噪比下通信的载波恢复困难问题,研究了基于最大似然估计的编码辅助联合接收技术,提出了一种译码软信息迭代的码辅助载波同步方法。该方法将译码器和解调器通过译码软信息连接,通过设置软信息门限,确保用于同步的软信息是可靠的,并经过解调和译码间的不断迭代,对载波的相差进行估计,对每个码字的相差分别进行补偿。仿真表明,高动态低信噪比下,该算法能较好地完成载波同步,获得接近理想同步的接收性能。
A code-aided iterative carrier synchronization algorithm based on maximum likelihood estimation is proposed and explored, thus to solve the problem of the carrier recovery in high dynamic and low signal- to-noise ratio. This method, by connecting the decoder and demodulator via decoding soft information, and also by setting up the soft information threshold ensures that the soft information for synchronization is reliable, and after the continuous iteration between demodulation and decoding estimates the carrier phase difference and compensates respectively the phase difference of each code word. Simulation results indicate that under high dynamic and low signal-to-noise ratio, this algorithm can fairly realize carrier synchronization and acquire receiving performance near ideal synchronization.
作者
汪绍骏
郭文彬
戎帅
王飞飞
WANG Shao-jun;GUO Wen-bin;RONG Shuai;WANG Fei-fei(Beijing University of Posts and Telecommunications,Beijing 100876,China;Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory,Shijiazhuang Hebei 050000,China;Beijing Institute of Information Technology,Beijing 100094,China)
出处
《通信技术》
2018年第8期1771-1775,共5页
Communications Technology
基金
国家自然科学基金项目(No.61271181
No.61571054)
通信网信息传输与分发技术重点实验室基金项目(No.9140C170203140C17001)~~
关键词
高动态
载波同步
码辅助
迭代译码
软信息门限
high dynamic
carrier synchronization
code aided
iterative decoding
soft information threshold
