运用多速率处理技术实现软件无线电接收机的数字解调

Implementation of Digital Demodutation Radio Receiver Using Multi-speed Processing Technique

软件无线电接收机是基于一个通用可编程硬件平台,通过软件来实现各种通信标准。对软件无线电中的关键技术———高速数据采集技术、多速率数字信号处理技术进行了探讨,结合目前器件水平,设计出基于多速率处理技术宽带信号的软件无线电解决方案,即专用可编程器件结合通用DSP处理器完成对中频数字信号解调功能。以AM信号为例进行仿真分析表明:对于宽带中频信号,用低于其信号最高频率的速率采样,数字解调后,完全能够恢复出原始的信号,能较好地完成AM信号的接收解调,满足设计要求。

Software radio receiver is based on a versatile programmable platform, which can realize differ-ent molds. High-speed data acquisitions and muhi-speed processing are discussed which are the key tech-niques of the software radio. Then, on the basis of these, IF digitalization project based on multi-speed processing model was adopted according the present chip level, which completes the demodulation of IF digital signals by specific programmable chip and common DSP. Finally, taking the AM signal as an ex-ample, the feasibility and implementation of the proposal were verified.