Programming design of Digital-Down Converter based on software radio

In this paper, three projects of the Digital-Down Converter software radio receivers are discussed. On this basis, efficient and optimized concrete implementation methods about Digital-Down Converter are put forward. It replaces the specialized Digital-Down Converter hardware integrated circuits, it strengthened flexibility and adaptability in IF system. To reduce calculation, in this paper, author adopts the project of integrating abstracting with filtrating. That multiphase-decompose the filter and memorize different phases. Tests show that this project is feasible and available.

I. Introduction

The final purpose of software radio is to reach the programmable characteristic of the system. On the universal hardware platform of programmable control, digital signal processing technology is adopted. It make use of software to define how to realize every partial functions of software radio including programming of wireless wave band, channel modulate, inputting mode, data speed and so on. Controlling and operating by program is the most prominent characteristic. Software radio system demands signals to be processed in real time [1]–[3]. So that arithmetic time and space complexity, they have to meet the demands of the system. This article puts forward a project of software arithmetic as Digital-Down Converter is concerned. Then optimize the project [4].