数字接收机正交基带信号提取方案的研究

The Study of Extraction of Digital Orwthogonal Baseband Signal in Digital Receiver

数字正交基带信号提取技术是数字中频接收机的一项关键技术。当前的经典实现方法有:正交数字混频法和多相滤波正交变换法。软件无线电的数字接收机正交基带信号提取方案多采用多相滤波法,数字信号处理器使用软件编程的方法来实现。介绍了采用软硬件联合实现数字正交基带信号提取的方案,用硬件电路设计降低软件实现复杂度。

Extraction of digital Orthogonal baseband signal is one key techinique i n digital IF receiv-er and there are two classical algorithms to realize it:orthogonal digital mixing and polyphase filtering.T he latter is applied more extensively i n digital receiver based on the concept of software defined radio.In this paper,one method combining software and hardware to extract digital orthogonal baseband signal is present-ed,in which hardware design is appli ed to reduce the complexity of softwa re implementation.