编码GMSK的一种新的迭代检测方法

北京邮电大学学报 ›› 2004, Vol. 27 ›› Issue (3): 58-62.

编码GMSK的一种新的迭代检测方法

郭文彬, 杨鸿文, 杨大成

北京邮电大学电信工程学院, 北京 100876

收稿日期:2003-04-22 出版日期:2004-03-28
作者简介: 郭文彬(1971—), 男, 讲师, E-mail:gwb@bupt.edu.cn.
杨大成(1951—), 男, 教授, 博士生导师, E-mail:yangdc@bupt.edu.cn.
基金资助:
国家“863计划”项目(2001AA123045)

A New Iterative Detection for Coded GMSK

GUO Wen-bin, YANG Hong-wen, YANG Da-cheng

Telecommunication Engineering School, Beijing University of Posts andTelecommunications, Beijing 100876, China

Received:2003-04-22 Online:2004-03-28

摘要/Abstract

摘要： 本文给出了BT为0.3的高斯最小移频键控信号(GMSK)的一种新的简化等效模型,即在抽样点上信号可以近似等效成一个四状态的递归型卷积码和四相键控(QPSK)调制信号。结合此简化模型给出了编码GMSK系统的一种联合解调迭代检测方法,将译码后的软信息反馈给解调端形成迭代。在加性高斯白噪声(AWGN)信道下,通过计算机仿真比较了联合迭代解调和非联合解调迭代的性能,仿真表明联合解调迭代具有明显的增益。

关键词: 高斯最小移频键控, 串行级联, 联合解调

Abstract: A simplified model equivalent to Gaussian minimum shift keying (GMSK) signal with BT equaling 0.3 was expressed. In other words, the signal could be approximately equivalent to a four-state recursively convolutional code concatenated with quadrature phase shift keying (QPSK) modulation at sampling time. So that an iterative detection with joint demodulation was proposed for coded GMSK. The decoded soft information was then fed back to the demodulation for iterations. A comparison between joint demodulation and non-joint demodulation under additive white Gaussian noise (AWGN) channel was given by computer simulations. The simulation shows that an obvious improvement is obtained by joint demodulation.

Key words: coded Gaussian minimum shift keying, serial concatenated convolu-tional code, continuous phase modulation

中图分类号:

TN919.3

郭文彬, 杨鸿文, 杨大成. 编码GMSK的一种新的迭代检测方法[J]. 北京邮电大学学报, 2004, 27(3): 58-62.

GUO Wen-bin, YANG Hong-wen, YANG Da-cheng. A New Iterative Detection for Coded GMSK[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2004, 27(3): 58-62.