电子学报 ›› 2001, Vol. 29 ›› Issue (4): 471-474.

• 论文 • 上一篇    下一篇

IS-95ACDMA通信系统中一种新的信号多速率检测算法

樊平毅1, 夏香根2   

  1. 1. 清华大学电子工程系微波与数字通信国家重点实验室,北京 100084;2. 美国特拉华大学电机与计算机工程系,美国
  • 收稿日期:1999-12-16 修回日期:2000-04-16 出版日期:2001-04-25 发布日期:2001-04-25

A New Multi-Rate Detection Algorithm for IS-95A CDMA System

FAN Ping-yi1, XIA Xiang-gen2   

  1. 1. The State Key Lab.on Microwave and Digital Communication,Department of Electronic Engineering,Tsinghua University,Beijing 100084,China;2. Department of Electrical and Computer Engineering,University of Delaware U.S.A.,U.S.A.
  • Received:1999-12-16 Revised:2000-04-16 Online:2001-04-25 Published:2001-04-25

摘要: 信息多速率传输和检测是现代和未来数字通信系统设计的主要特征之一.在IS-95 A系统中,采用了四种不同的速率传输话音信息,速率的选择采用话音激活方式.在接收端,为了简化设备复杂度,降低能耗,需要确定信息的传输速率,以便可以正确的译码.最近,文 提出一种有效的多速率检测算法.本文提出一种新的多速率检测算法,与文 的算法相比,计算复杂度相当,但在低信噪比的情况下,速率误检概率的整体性能有较大的提高.

关键词: 多速率检测, IS-95, 码分多址, 信噪比

Abstract: Information transmission and detection with different rates are one of the main characteristics in the current and future digital communication systems.In IS-95 A CDMA system,the speech encoder has four different rates depending on the speech activities of the speaker.At the receiver,in order to reduce the complexity of the decoder and save the energy,it needs to detect which rate is used,so that it can select one matched decoder to deal with the transmitted signals.In [3],an effective multi-rate detection algorithm was presented recently.In this paper,a new multi-rate detection algorithm is proposed.Compared with that in [3],the proposed algorithm in this paper has comparable computation complexity and a considerable improvement on the total performance of the error rate detection probability under relatively low signal to noise ratios.

Key words: multi-rate detection, IS-95, CDMA, signal to noise ratio

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