摘要
提出数字通信接收机中,由2DPSK调制信号还原基带信号,解决好收发载波同步的一种算法.对中频信号(2DPSK)直接采样后,在DSP(数字信号处理器)中用软件完成正交数字下变频,并从产生的信号中估计出收发载波的频差,并经卡尔曼滤波后再结合数字锁相环可还原基带信号,较好地解决载波同步问题,达到载频捕获范围宽、同步跟踪速度快、环路噪声小的特点.
In this paper, base-band signal is returned by 2DPSK modulation signal. The algorithms of receiving and sending carrier frequency synchronization in digital communication receiver are suggested. The sampled midfrequency signal（2DPSK） done with is Pseudo-orthogonal digital downconversion in DSP, and frequency difference of receiving and sending carrier by occurred signal. Though Kalman filter and digital phase-locked loop, base, band signal can be returned,can better solve carrier synchronization problem with the features of wide capture carrier range, fast synchronization track and little loop noise.
出处
《湖南工程学院学报（自然科学版）》
2006年第1期23-26,共4页
Journal of Hunan Institute of Engineering(Natural Science Edition)
关键词
数字通信
接收机
载波同步
数字锁相环
算法
digital communication
receiver
carrier synchronization
digital phase-locked loop
algorithm
