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应用科学学报 ›› 2001, Vol. 19 ›› Issue (3): 214-217.

• 论文 • 上一篇    下一篇

IIR滤波反馈差分检测在π/4DQPSK中的应用

郭道省, 甘仲民, 张邦宁, 刘爱军   

  1. 解放军理工大学通信工程学院卫星通信系, 江苏南京 210016
  • 收稿日期:2000-06-17 出版日期:2001-09-30 发布日期:2001-09-30
  • 作者简介:郭道省(1973-),男,河南南阳人,博士生;甘仲民(1937-),男,广西南宁人,教授,博导.

Application of IIR Filter Feedback Differential Detection in π/4 DQPSK

HJGUO Dao-sheng, GAN Zhong-min, ZHANG Bang-ning, LIU Ai-jun   

  1. Department of Satellite Communication of ICE, PLAU ST, Nangjing 210016, China
  • Received:2000-06-17 Online:2001-09-30 Published:2001-09-30

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摘要： 着重研究ⅡR滤波反馈差分检测用于π/4 DQPSK解调时的原理,给出了具体系统实现时的硬件框图和软件流程图.用计算机仿真了该算法在加性白高斯噪声(AWGN)信道中的性能.仿真表明,相对于传统的差分解调,该算法在误比特率为10-4时在AWGN信道中有1.2dB的性能改善.考虑到实现损耗,实际系统的测试结果与仿真结果相一致.这使得该算法能够在广泛采用π/4 DQPSK差分解调的卫星通信系统中应用,从而改善了π/4 DQPSK传统差分检测的性能,提高了功率受限的卫星通信系统容量和通信质量.

关键词: 卫星通信系统, IIR滤波反馈差分检测, π/4DQPSK解调

Abstract: In this paper, we emphasize on analyzing the application of ⅡR filter feedback differential detection in differential demodulation of π/4DQPSK. The practical implementation scheme is presented. The BER performance and its correction capability are investigated by computer simulation in AWGN channel. The simulation results show that the improved performance of proposed algorithm is superior to conventional differential demodulation by 1.2dB at a BER of 10-4 in AWGN channel. Considering that the loss of implementation and the test result of practical system agree with the simulation result, the algorithm can be widely applied in practical satellite communication system, thereby improving the system's traditional differential detection and the capacity and communication quality of a satellite communication system with limited power.

Key words: IIR filter feedback differential detection, π/4 DQPSK demodulation, satellite communication system

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