摘要
为解决极值点抖动和假同步问题,首先在分析AWGN信道下小波多速率调制最佳接收的基础上,应用单子带上的最大似然估计方法,提出了改进的同步时钟提取算法,不仅能准确估计小波相位延时,而且可以校正收发时钟的频率偏差。在此基础上,对相位误差函数进行了重新定义,并分析了它在抗假同步和提高稳定性上所作的改进。仿真结果表明,该算法具有快速、稳定的收敛性能和随尺度增大而逐级优化的误码性能。
In order to selve the problem of position jitter of extremums and false synchronization, this paper analyzed the optimum reception of wavelet-based multirate modulation in AWGN channels, based on which an improved algorithm for clock acquisition was proposed by maximum-likelihood （ML-） estimation in a single subband. The algorithm can not only estimate the phase delay of wavelet carrier accurately, but can also correct the frequency bias between transmitter clock and receiver clock. And then, the phase-error function wais re-defined and its improvements on stability and false synchronization prevention were also analyzed. The simulation indicates that the algorithm can achieve fast and stable convergence, and a stepwise lower BER as scale increases.
出处
《信阳农业高等专科学校学报》
2009年第1期132-134,共3页
Journal of Xinyang Agricultural College
关键词
时钟提取
小波多速率调制
最佳接收
相位误差函数
clock acquisition
wavelet-based multirate modulation
optimum reception
phase-error function
