变采样多相滤波器组信道化接收机的实现

Implementation of a Channelized Receiver Using Polyphase Filter Bank Based on Embedded Resampling

针对多相滤波器组信道化接收机的通道采样率在数值上等于通道带宽,因此无法兼顾最优信道带宽和最优采样率的问题,提出一种基于嵌入式变采样多相滤波器组的信道化接收机。该信道化接收机根据要求的变采样率改变数据的输入速率,并依据数学推导对原有系统的结构进行变形,可有效解决多相滤波器组通道采样率和通道带宽的耦合问题,从而实现嵌入式变采样的目的。本接收机设计方法在兼顾系统最优采样和最小信道带宽要求的前提下,能有效避免频道浪费或复杂的插值算法。仿真结果表明,该接收机在不增加计算量的基础上能有效改变采样率,提高系统实时处理能力。

Because of the fact that the channel sampling rate of polyphase filter bank is equal to the channel bandwidth,it is hard to give attention to both the optimal sampling rate and the minimum channel bandwidth.In this paper,a channelized receiver using polyphase filter bank based on embedded resampling is proposed.By adjusting the input data rate and reorienting the system structure,the coupling between the channel sampling rate and the bandwidth can be effectively removed.The proposed design can give consideration to both the optimal sampling rate and the minimum channel bandwidth.Therefore,both the wastage of channel resources and the complicated interpolation algorithm can be avoided.Simulation results show that the receiver can change sampling rate without increasing additional calculation complexity,which improves the real-time processing capability.