π/4-DQPSK调制的快速位同步捕获和位同步跟踪  

Symbol Timing Rapid Acquisition and Tracking for π/4 DQPSK Signals

作　　者：赵杭生[1] 甘仲民[1] 屈德新[1] 

机构地区：[1]南京通信工程学院

出　　处：《电子学报》1999年第4期24-27,38,共5页Acta Electronica Sinica

摘　　要：低速率数字移动突发通信中，存在着较大的多普勒频移．本文根据π／４ＤＱＰＳＫ本身的特点，提出了一种与信号能量检测、频移初捕并行处理的位定时捕获算法，与先信号能量检测，再估计多普勒频移，然后进行位定时捕获的串行处理相比，有较明显的优越性，同时本文还给出了一种很简捷的位定时跟踪算法，并对此作了计算机仿真．This paper presents a new algorithm of symbol timing rapid acquisition for π/4 DQPSK with Doppler frequency offset in low rate digital mobile burst signal.This algorithm can be done in parallel with signal acquisition and frequency offset acquisition.It has advantages over serial systems.That detect signal energy,then estimate Doppler frequency offset,and finely acquire symbol timing.A very simple symbol timing tracking algorithm is also presented in the paper.Finally,the results of computer simulations are given.

关 键 词：移动通信 Π/4-DQPSK 位定时恢复 位同步捕获 

分 类 号：TN929.5[电子电信—通信与信息系统]