EBPSK载波同步中的相位误差分析
doi: 10.3724/SP.J.1146.2008.00282
Phase Error Analysis on EBPSK Carrier Synchronization
-
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/4，输入信噪比小于6 dB时，恢复出的载波要比BPSK更加精确。Abstract: Carrier synchronization is one of the most important parts in communications. This paper makes analysis on PLLs 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 of /4, and SNR lower than 6dB performs better than BPSK in carrier recovery.
-
吴乐南, 张士凯. 统一的二元相位调制和解调方法. 中国发明公开号: CN 1889550A, 2007.[2]Qi Chen-hao, Feng Man, and Wu Le-nan. Analysis oftransmission system based on phase locked loop[J].The ThirdInternational Conference on Natural Computation(ICNC07), Hainan, China.2007, 2:415-419[3]McCune E W. Extended Phase-Shift Keying. [Ph.D.dissertation], Electrical and Computer Engineering,University of California, August 1998.[4]McCune E W and Soderstand M A. Digital signal processingfor extended phase-shift keying (EPSK)-a new modulationscheme. 42nd Midwest Symposium on Circuits and Systems,Las Cruces, NM, USA, 1999, 2: 817-820.[5]戚晨皓, 陈国强, 吴乐南. 二阶锁相环的EBPSK 信号解调分析[J].电子与信息学报.2009, 31(2):418-421浏览[6]张厥盛, 郑继禹, 万心平. 锁相技术. 西安: 西安电子科技大学出版社, 2004: 60-64.[7]樊昌信等. 通信原理(第五版). 北京: 国防工业出版社, 2002:95-96.[8]Proakis J G. Digital Communications. Third Edition, NewYork: McGraw-Hill, 1999: 40-41.[9]屈强等. 软件锁相环的设计与应用. 遥测遥控, 2007, 28(1):10-14. -
计量
- 文章访问数: 3215
- HTML全文浏览量: 81
- PDF下载量: 920
- 被引次数: 0
下载:
