Design scheme based on software radio IF receiving system
This paper introduces a design scheme based on software radio IF receiving system. This scheme combines sampling theory, multi-rate signal processing, high-efficiency digital filtering and other theories to complete the design of analog-to-digital conversion (A/D) modules and digital down-conversion (DDC) modules in the system. The correctness of this scheme is verified theoretically by MATLAB software simulation.
1 Introduction
Software Radio proposes a new idea of ​​designing, manufacturing, and using wireless communication systems and devices. It is free of traditional radio design ideas that are completely hardware-dependent for use, and is provided by a modular, universal hardware platform. The business is freed from the long-term dependence on fixed circuits, taking advantage of software programmable, easy to modify and low cost (less hardware investment) to raise the level of wireless communication technology to a new level. In this paper, a scheme based on software radio IF receiving system is designed and verified by MATLAB software.
2. Software radio basic structure
The structure of software radio can be basically divided into three types: RF low-pass sampling digital structure, RF band-pass sampling digital structure and broadband mid-band pass sampling digital structure. This paper does not elaborate on its structure. In view of its shortcomings, combined with two mathematical models of software radio receiver, a block diagram structure of software-based radio IF receiving system is proposed, as shown in Figure 1.1. . The modules in the dashed box in the figure, namely the analog-to-digital conversion (A/D) module and the digital down-conversion (DDC) module, are the main design parts of this paper.
3. MATLAB program design of software radio IF receiving system
The working process of the analog-to-digital converter can be roughly divided into three parts: sampling, quantization, and encoding. Figure 3.1 is the flow chart of the A/D conversion module programming, and Figure 3.2 is the flow chart of the digital down conversion module programming.
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