摘要
载波同步是通信中的重要环节。该文分析了EBPSK载波同步中的相位误差。首先在包含窄带高斯噪声的条件下,通过建立锁相环线性化模型,推导了EBPSK载波恢复中的输出相位噪声方差;其次在相同的参数条件下,与BPSK的平方环和Costas环输出相位噪声方差进行对比,给出了不同输入信噪比和环路带宽下的仿真结果。研究表明,在EBPSK占空比1:9,相位跳变π/4,输入信噪比小于6 dB时,恢复出的载波要比BPSK更加精确。
Carrier synchronization is one of the most important parts in communications. This paper makes analysis on PLL＇s phase error during EBPSK carrier recovery. Firstly, under the narrow band Gauss noise condition, PLL linear model is established and output phase noise variance is figured out. Then, comparisons are made with the squiring loop and Costas loop of BPSK. Some simulations are carried out with different input SNR and loop Bandwidth. The results demonstrate that EPBSK signal with duty ratio of 1：9, phase shift ofπ/4, and SNR lower than 6dB performs better than BPSK in carrier recovery.
出处
《电子与信息学报》
EI
CSCD
北大核心
2009年第9期2166-2170,共5页
Journal of Electronics & Information Technology
基金
国家自然科学基金(60472054)资助课题
关键词
扩展的二元相移键控
锁相环
相位噪声方差
环路滤波器
EBPSK（Extended Binary Phase Shift Keying）
PLL（Phase Locked Loop）
Phase noise variance
LF（Loop Filter）
