h=1/M的M-CPFSK信号定时-频偏联合估计算法  

Joint Timing and Frequency Estimation Algorithm for M-CPFSK Signals with h=1/M

作　　者：刘晓明[1] 汪梦柔[1] 解志强[1] 王潇瀛[1] 

机构地区：[1]重庆大学通信工程学院,重庆400030

出　　处：《世界科技研究与发展》2011年第3期457-460,共4页World Sci-Tech R&D

摘　　要：提出了一种针对突发模式的h=1/M的M-CPFSK信号定时-频偏联合估计算法。在每个数据包前嵌入一段特定的训练序列,接收端将信号做K级差分,计算每级差分信号自相关的J次方,再进行离散傅里叶变换DFT提取定时和载波频偏信息。适用于h=1/M的全响应或部分响应、矩形或升余弦滤波器M-CPFSK信号。Matlab仿真结果表明,在加性白高斯噪声信道以及Ray-leigh平坦衰落信道上,该算法能快速准确的估计定时和载波频率偏差。A Joint Timing and Frequency estimation algorithm is proposed for M-CPFSK signals with h = 1/M in burst mode. A Training sequence is embedded before transmission of each packet. The autocorrelation of the K - thorder differential signals is calculated by the receiver. The power of J is raised. Then the timing and carrier frequency offset estimation can be estimated from the phase of DFT outputs. The proposed algorithm is suited for M-ary continuous phase frequency shift keying（M-CPFSK） with h = l/M, full or partial response and rectangular or raised cosine filter. Simulation by Matlab shows that the timing and carrier frequency offset can be estimated by this algorithm rapidly and accurately in the additive white Gaussian noise（AWGN） and the Rayleigh flat fading channels.

关 键 词：M-CPFSK 定时恢复 频偏估计 自相关 

分 类 号：TN911.23[电子电信—通信与信息系统]