短突发传输系统的联合导频和迭代译码载波同步

doi:10.3969/j.issn.1001-2400.2014.01.005

J4 ›› 2014, Vol. 41 ›› Issue (1): 23-28+63.doi: 10.3969/j.issn.1001-2400.2014.01.005

短突发传输系统的联合导频和迭代译码载波同步

孙锦华¹;王雪梅¹;吴小钧²

(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. 长安大学信息工程学院，陕西西安 710064)

收稿日期:2012-10-18 出版日期:2014-02-20 发布日期:2014-04-02
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 and iterative decoding carrier synchronization for the short burst transmission system

SUN Jinhua¹;WANG Xuemei¹;WU Xiaojun²

(1. State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an 710071， China;
2. School of Information Engineering, Chang'an Univ., Xi'an 710064， China)

Received:2012-10-18 Online:2014-02-20 Published:2014-04-02
Contact: SUN Jinhua

摘要/Abstract

摘要：

针对短突发通信在低信噪比条件下的载波同步算法存在估计精度低和同步范围小的问题，提出了联合导频和迭代译码的载波同步算法．首先对导频序列的去调制信息进行互相关，并利用互相关之和对载波参数进行粗估计；然后再重新利用导频序列和扩展Turbo译码器输出的信息位和校验位的软信息进行载波参数的细估计，进而实现有效的载波同步．理论分析和仿真结果表明，粗估计算法能够兼顾频率估计范围和估计精度的要求，针对一定长度的数据序列，Preamble-Middle结构是最优的帧结构;当归一化频偏小于1.5×10^-3时，通过粗同步，使得Turbo码在剩余频偏范围内输出软信息比较可靠，再结合译码器输出的软信息进行细估计，使得Turbo码能够达到理想的误码率性能．

关键词: 同步, 导频, Turbo码, 软输出

Abstract:

Considering the low estimation accuracy and small synchronization range of carrier synchronization algorithms in low signal to noise ratio (SNR) for short burst communication systems, a joint pilot and iterative decoding soft-output carrier synchronization algorithm is proposed. Firstly, the received pilot sequence is extracted and modulation is removed, with the modulation-removed signals made cross-correlated. Then the summation of all the correlation values is used to perform initial carrier parameters estimation. Secondly, the pilot sequence is reused with the soft-output information based on the extended Turbo decoder to obtain fine frequency and phase estimation values. Theoretical analysis and simulation results show that the coarse estimation algorithm can satisfy the requirements of the frequency estimation range and estimation accuracy, and preamble-middle pilot placement is optimal for a certain length of the data frame; The turbo decoder can obtain more reliable soft-output information with small residual frequency offset after initial coarse synchronization when the normalized frequency offset is less than 1.5×10^-3, with the joint pilot and soft-output of the decoder used to estimate fine carrier parameters, which can make the turbo code achieve optimal BER performance.

Key words: synchronization, pilot, Turbo code, soft-output

中图分类号:

TN911.22

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.

SUN Jinhua;WANG Xuemei;WU Xiaojun. Joint pilot and iterative decoding carrier synchronization for the short burst transmission system[J]. J4, 2014, 41(1): 23-28+63.

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短突发传输系统的联合导频和迭代译码载波同步

Joint pilot and iterative decoding carrier synchronization for the short burst transmission system

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