联合导频辅助和解扩软输出的突发直扩载波同步

doi:10.3969/j.issn.1001-2400.2013.05.008

J4 ›› 2013, Vol. 40 ›› Issue (5): 44-50.doi: 10.3969/j.issn.1001-2400.2013.05.008

联合导频辅助和解扩软输出的突发直扩载波同步

孙锦华^1,2;李梦良¹;吴小钧³

(1. 西安电子科技大学综合业务网理论及关键技术国家重点实验室，陕西西安 710071；
2. 中国电子科技集团公司第54研究所通信网信息传输与分发技术重点实验室，河北石家庄 050081;
3. 长安大学信息工程学院，陕西西安 710064)

收稿日期:2012-05-10 出版日期:2013-10-20 发布日期:2013-11-27
通讯作者: 孙锦华
作者简介:孙锦华(1979-)，女，副教授，博士，E-mail：jhsun@xidian.edu.cn．
基金资助:
国家自然科学基金资助项目(60902039, 61271175)；中央高校基本科研业务费专项资金资助项目(K50511010014，K5051201043,CHD2011JC088)；长安大学基础研究支持计划资助项目

Joint pilot assisted and despread soft-output carrier synchronization for the burst DSSS system

SUN Jinhua^1,2;LI Mengliang¹;WU Xiaojun³

(1. State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an 710071， China;
2. Sci. and Tech. on Info. Transmission and Dissemination in Communication Networks Lab., Shijiazhuang 050081， China;
3. School of Information Engineering, Chang'an Univ., Xi'an 710064， China)

Received:2012-05-10 Online:2013-10-20 Published:2013-11-27
Contact: SUN Jinhua

摘要/Abstract

摘要：

针对突发直扩系统在极低信噪比下载波估计精度和范围不能兼顾的问题，提出了一种联合导频辅助和解扩软输出的载波同步算法．基于导频和数据分插的帧结构，首先利用导频信息采用平均周期图法对载波频偏进行粗估计，通过最大似然算法得到相偏粗估计值，并对接收信号进行分段相位补偿;然后利用解扩软输出进行频偏细估计，进而得到相偏的细估值．理论分析和仿真结果表明:在极低信噪比和导频数目一定的条件下，算法的估计性能接近修正克拉美罗界，具有较高的频偏估计精度，且频偏和相偏估计范围大，能达到理想同步的误比特率性能．

关键词: 载波同步, 直接序列扩频, 导频, 解扩软输出

Abstract:

Current carrier synchronization algorithms at extremely low signal to noise ratios (SNRs) for burst direct sequence spread spectrum communication systems are not very good at achieving a high estimation precision and wide estimation range at the same time. A joint pilot assisted and despread soft-output carrier synchronization algorithm is proposed in this paper. Based on a frame structure in which the pilot symbols are separated with data symbols, a coarse frequency offset estimation is first performed based on the averaging periodogram method with the help of pilot symbols, and a coarse phase offset estimation is obtained with the maximum likelihood algorithm, and then the phase of the received signals is compensated for each segment of pilot and data symbols. Next, a fine frequency offset estimation is carried out using the despread soft output; then the fine phase offset estimation is obtained. Simulation results show that at extremely low SNRs and with a fixed number of pilots, the performance of the algorithm is near the modified Cramer-Rao bound with high frequency offset estimation precision and wide frequency offset and phase offset estimation ranges. The bit error rate of the algorithm is close to the ideal performance.

Key words: carrier synchronization, direct sequence spread spectrum, pilot, despread soft output

中图分类号:

TN914.42

孙锦华;李梦良;吴小钧. 联合导频辅助和解扩软输出的突发直扩载波同步[J]. J4, 2013, 40(5): 44-50.

SUN Jinhua;LI Mengliang;WU Xiaojun. Joint pilot assisted and despread soft-output carrier synchronization for the burst DSSS system[J]. J4, 2013, 40(5): 44-50.

参考文献

［1］ Kumar J, Mehra R. Costas Loop Implementation for Synchronous Detection of Carrier in Radio Receiver ［C］//International Conference on Advanced Computing, Communication and Networks'11(ICACCN 2011). Chandigarh: IEEE, 2011: 975-980.
［2］ Huang Liechao, Zhang Tianqi, Bai Juan, et al. Study of Carrier Tracking for High Dynamic M-ary Spread Spectrum Signals ［C］//Proceedings of 4th International Congress on Image and Signal Processing: 1. Piscataway: IEEE, 2011: 261-265.
［3］王俊, 李加琪, 吴嗣亮. 锁频环辅助下锁相环的跟踪误差分析［J］. 北京理工大学学报, 2011, 31(7): 838-843.
Wang Jun, Li Jiaqi, Wu Siliang. Tracking Error Analysis of FLL-Assisted-PLL［J］. Transactions of Beijing Institute of Technology, 2011, 31(7): 838-843.
［4］ Mengali U, D'Andrea A N. Synchronization Techniques for Digital Receivers［M］. New York: Plenum Press, 1997.
［5］ Hong D K, Kim D J, Lee Y J, et al. A Simple Interpolation Technique for the DFT for Joint System Parameters Estimation in Burst MPSK Transmission［J］. IEEE Transactions on Communications, 2003, 51(7): 1051-1056.
［6］崔艳鹏, 胡建伟, 杨绍全, 等. 一种低信噪比下MPSK信号频率估计方法［J］. 西安电子科技大学学报, 2011, 38(5): 90-94.
Cui Yanpeng, Hu Jianwei, Yang Shaoquan, et al. Novel Frequency Estimation of MPSK Signals in Low SNR Environment［J］. Journal of Xidian University, 2011, 38(5): 90-94.
［7］李赞, 张智翼, 裴昌幸, 等. 流星余迹极低信噪比信号同步和补偿技术［J］. 电波科学学报, 2007, 22(6): 918-922.
Li Zan, Zhang Zhiyi, Pei Changxin, et al. Signal Synchronization and Compensation of Meter for Extremely Low SNR［J］. Chinese Journal of Radio Science, 2007, 22(6): 918-922.
［8］龚超, 张邦宁, 郭道省. 基于FFT的快速高精度载波参数联合估计算法［J］. 电子学报, 2010, 38(4): 766-770.
Gong Chao, Zhang Bangning, Guo Daoxing. A Quick and Accurate Union Carrier Parameter Estimation Algorithm Based on FFT［J］. Acta Electronica Sinica, 2010, 38(4): 766-770.
［9］ Freedman A, Rahamim Y, Reichman A. Maximum-Mean-Square Soft-Output (M2S2O): a Method for Carrier Synchronization of Short Burst Turbo Coded Signals［J］. IEE Proceedings-Communications, 2006,153(2): 245-255.
［10］包建荣, 詹亚锋, 陆建华. 基于LDPC 译码软信息的迭代载波恢复［J］. 电子与信息学报, 2010, 31(10): 2416-2420.
Bao Jianrong, Zhang Yafeng, Lu Jianhua. Iterative Carrier Recovery Based on Soft Decision Metrics of LDPC decoding ［J］. Journal of Electronics ＆ Information Technology, 2009, 31(10): 2416-2420.
［11］史治平, 唐发建, 晏辉, 等. 编码辅助载波同步算法的优化设计［J］. 电子科技大学学报, 2012, 41(3): 342-347.
Shi Zhiping, Tang Fajian, Yan Hui, et al. Optimization of Code Aided Carrier Synchronization Algorithm［J］. Journal of Univercity of Electronic Science and Technology of China, 2012, 41(3): 342-347.
［12］ Rahamim Y, Freedman A, Reichman A. ML Iterative Soft-Decision-Directed(ML-ISDD): a Carrier Synchronization System for Short Packet Turbo Coded Communication［J］. IEEE Transcations on Communications, 2008, 56(7):1169-1177.
［13］晏辉, 唐发建, 张忠培. 一种基于低码率LDPC码的编码与导频联合辅助载波同步算法［J］. 电子与信息学报, 2011, 33(2): 470-474.
Yan Hui, Tang Fajian, Zhang Zhongpei. A Jointed Assisted Carrier Synchronization Algorithm with Code and Pilot Based on Low Rate LDPC Code［J］. Journal of Electronics ＆ Information Technology, 2011, 33(2): 470-474.
［14］ Godtmann S, Hadaschik N, Steinert W, et al. A Concept for Data-Aided Carrier Frequency Estimation at Low Signal-to-Noise Ratio ［C］//IEEE International Conference on Communications. Piscataway: IEEE, 2008: 463-467.
［15］丁玉美, 阔永红, 高新波. 数字信号处理——时域离散随机信号处理［M］. 西安: 西安电子科技大学出版社, 2002.

[1]	周佳鑫,沈炳声,周正春,范平志,骆喆. 结构化导频序列设计及低复杂度检测算法[J]. 西安电子科技大学学报, 2020, 47(6): 45-49.
[2]	赵清华,马天鸣,王星. 一种辅助导频幅度可调的FBMC信道估计方案[J]. 西安电子科技大学学报, 2020, 47(6): 91-98.
[3]	刘灿,李勇朝,张锐,李涛. 三维大规模多进多出系统中导频污染抑制方案[J]. 西安电子科技大学学报, 2019, 46(4): 9-15.
[4]	李文刚;胡爱丽;孙珑心;王屹伟. LOS环境下零导频Massive MIMO通信方法[J]. 西安电子科技大学学报, 2018, 45(4): 1-5+85.
[5]	孙锦华;王昊;余忠洋. 联合频相估计中的对称化解耦合技术[J]. 西安电子科技大学学报, 2018, 45(2): 1-6.
[6]	李晓洁;李颖;韩会梅. 大规模MIMO系统下的导频随机接入方案[J]. 西安电子科技大学学报, 2018, 45(1): 55-59.
[7]	孙锦华;王雪梅;吴小钧. 短突发传输系统的联合导频和迭代译码载波同步[J]. J4, 2014, 41(1): 23-28+63.
[8]	孙锦华;朱吉利;吴小钧. 导频和软信息联合辅助的短突发SOQPSK载波同步[J]. J4, 2013, 40(4): 14-20+101.
[9]	刘立程;胡瑞. 利用沃尔什码扩频的MC-CDMA系统频偏估计算法[J]. J4, 2012, 39(1): 135-140.
[10]	李丹;冯穗力;叶梧;庄宏成. 快变信道环境下OFDMA系统的信道估计算法[J]. J4, 2010, 37(4): 758-763.
[11]	郭里婷. 含导频的OFDM信号的周期平稳特性分析[J]. J4, 2010, 37(1): 169-173.
[12]	郭漪;刘刚;葛建华. 一种新的OFDMA上行链路定时偏移估计算法 [J]. J4, 2008, 35(6): 963-967.
[13]	郭漪;刘刚;葛建华. MIMO-OFDM系统中一种干扰抑制迭代信道估计算法 [J]. J4, 2008, 35(2): 196-200.
[14]	任光亮;行江涛;常义林. 信噪比辅助的OFDM系统剩余载波频偏估计算法 [J]. J4, 2008, 35(2): 201-205.
[15]	曾志斌1;庄奕琪1;向新2. 一种准正交混合扩频通信算法 [J]. J4, 2007, 34(4): 538-542.

联合导频辅助和解扩软输出的突发直扩载波同步

Joint pilot assisted and despread soft-output carrier synchronization for the burst DSSS system

PDF (PC)

赞

可视化

被引次数

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

Metrics

本文评价

推荐阅读 10