Implementation of Software Defined Radio (SDR) in Baseband

Abstract

The ability to support multiple communication protocol is a fundamental feature of Software Defined Radio (SDR). This feature allows SDR to communicate with different radios without need for hardware change. The aim of this thesis is to design and implement a SDR in baseband to realize multiple modulation techniques (waveforms). The designed SDR baseband board consists of a Digital Signal Processor (DSP) and digital to analog and analog to digital convertors (ADC, DAC) to realize multiple waveforms, furthermore, a microcontroller is used as user interface to control the SDR baseband board. In this thesis, different Software Defined Radio architectures are discussed. The different baseband board hardware specifications are explained and the appropriate parts are selected for design, also multiple modulation techniques (analog and digital) are discussed and simulated using Matlab as well as C using Code Composer Studio. Finally, the DSP C program is modified and downloaded into SDR baseband board and tested using real time signal. The performance of the design is investigated by comparing the simulation with those results and results obtained from real time implementation. It is concluded that the simulation results and implementation results are nearly similar.