Real time implementation of software radio on DSP

Abstract

Since early 80s the exponential blowup of the cellular mobile systems has produced a plethora of analog and digital standards. The competition between the telecommunication giants and the strive for excellence has hindered the development of a unique standard worldwide. This obstacle has denied the users many facilities especially global roaming for many years. In early 90s the Software Radio Concept came to the rescue with the qualities like multistandard, multiband, multiservice, reconfigurable and reprogrammable by software. It has therefore emerged as the hottest technology in the field of communication. An assay to implement the software for a user terminal which is able to dynamically adapt to the radio environment, is made in our project. Our design uses three techniques namely Binary Phase Shift Keying, Quadrature Phase Shift Keying and Pi / 4 Quadrature Phase Shift Keying. Hence the processing of different modulation techniques is achieved successfully, realizing the property of reconfigurability which is the essence of the Software Radio. An algorithm for the symbol timing recovery was designed which is capable of synchronizing with two samples per symbols. It was compared with the Gardner algorithm and performance analysis of both the algorithms was given. Source Coding was done using ADPCM technique which All the blocks were designed and tested in Matlab and implemented on TMS320C6711 Digital Signal Processor (DSP). Architecture of the DSP was fully understood and programming was done using the C Language. C Language programs were converted into the Common Object Oriented Format (COFF) using the Integrated Development Environment, “Code Composer Studio” provided by Texas Instruments. Future work has been recommended in the implementation chapter of this dissertation.