论文部分内容阅读
针对软件无线电系统中接收信号采样时钟独立于发送信号时钟的特点,提出了在抽取操作过程中实现符号同步,避免了在基带阶段进行内插操作,以得到多相位信息的做法,利用过抽样信号固有的多相位信息,通过最大似然相位误差检测算法,调整延时机构,使信号传输延时匹配于延时分枝索引值,实现后续信号抽取输出为最佳采样值,利用级联积分梳状(CIC)滤波器和半带滤波器(HBF)作为抽取滤波器,应用滤波器多相分解算法,降低了系统实现的复杂性和运算量。仿真结果表明,当信号传输延时匹配于延时分枝索引值时,相位误差和延时分枝索引值将趋于稳定。
Aiming at the characteristic that the receiving signal sampling clock is independent of the sending signal clock in software radio system, this paper proposes to realize the symbol synchronization during the extracting operation and avoid the interpolation operation in the baseband stage to obtain the multi-phase information. The over-sampling signal The inherent multi-phase information, through the maximum likelihood phase error detection algorithm, adjusts the delay mechanism so that the signal transmission delay matches the delay branch index value to achieve the subsequent signal extraction and output as the best sampling value, (CIC) filter and half-band filter (HBF) as the decimation filter, the application of the filter polyphase decomposition algorithm, reducing the complexity of the system and the amount of computation. Simulation results show that the phase error and delay branch index tend to be stable when the signal propagation delay matches the delay branch index.