Software radio simulation of QPSK transciever 

Abstract

Software radio is an emerging technology, thought to build flexible radio systems, multiuser, multistandard, multiband, reconfigurable and reprogrammable by software. In fact the term software radio stands for the radio functionalities defined by software, meaning the possibility to define by software the typical functionality of a radio, usually implemented in transmitter and receiver equipment by dedicated hardware. The presence of software defining the radio necessarily implies the use of DSPs to replace dedicated hardware, to execute, in real time, the necessary software. Software radio will provide the means to realize signal processing tasks of communication transceiver by means of software .The replacement of ASIC technology with DSP technology opens the road to new horizons. Software implementation of baseband functions such as coding, modulation, equalization and pulse shaping. An approach towards this project required adequate knowledge of Digital Signal Processing and Digital Communications to implement the communication functions in software . We have designed a complete all digital communication transceiver in Matlab which is capable of the modulation, pulse shaping, phase synchronization, timing synchronization, equalization, channel coding etc. The wireless channel effects like multipath delay spread and mobility are created in software and the performance of the transceiver is evaluated for such channel.