Novel Design of a Low Cost Flexible Transceiver Based on Multistate Digitally Modulated Signals Using Wi-Fi Protocol for Software Defined Radio

Abstract

This paper relates to development of a novel generic transceiver module for software defined radio (SDR) built using graphical user interface language LabVIEW. The main advantage of the module is that it is built entirely on the user input interface where the users get the flexibility to change any parameters according to their needs and the generic module supports there digital modulation schemes with two forward error correction coding techniques where the user has the flexibility to decide about the same. The SDR module has been fully implemented and it has the ability to navigate over a wide range of frequencies with programmable channel bandwidth and modulation characteristics. The module has been tested on real time data, text and image transmissions using the test jig for Wi-Fi module. With the help of the Wi-Fi hardware test jig it has been proved that the signal transmitted has been recovered with very low probability of error at the destination. A plot between bit error rate (BER) and the signal to noise ratio shows that a low BER has been achieved using this design. The novelty of this design is that the module auto identifies the best available digital multistate modulation scheme i.e. M-ary quadrature amplitude modulation, M-ary frequency-shift keying, M-ary phase-shift keying for the selected input.