全数字接收机中插值滤波器的设计——全响应线性调制信号的插值问题

DESIGN OF INTERPOLATION FILTER FOR ALL DIGITAL RECEIVER-ON THE INTERPOLATION PROBLEM OF FULL RESPONSE MODULATION SIGNALS

接收机的全数字化实现是近年数字通信研究的一重要课题。插值滤波器的设计问题是接收机全数字化实现的核心问题之一。本文对全响应线性调制信号,给出了一个插值准则。对带限传输的情况给出了一插值公式。以系统脉冲响应为升余弦滚降函数为例,利用理论分析和数值分析的方法验证了插值公式的可行性和有效性,并给出了16-QAM信号的计算机仿真结果。

All digital implementation of receiver is a main topic on digital communication recently. The design of interpolation filter is one of the important problems for all digital implementation of receiver. In this paper, for full response linear modulation signal, an interpolation criterion has been proposed. An interpolation formula is presented on bandwidth-limited transmission signal. For example, using the raised consine roll off function as the system pulse response, the feasibility and effectiveness on the interpolation formula has been certified by theoretical and numerical analysis. The computer simulation result on 16-QAM signal is given.