Performance analysis of spectrum efficiency of cognitive radio

Abstract

Spectrum is getting more and scarcer with ever expanding wireless application technology. The new generation technologies such as 3G and 4G are causing more spectrum congestion. The solution for this may lie with use of Cognitive Radio (CR) for communication. In this paper, the performance of a new method is analysed. This method increases the channel efficiency and capacity by allowing both the licensed and unlicensed users to share the spectrum band. Spectral encoded signals are used for the transmission of data and parity bits. OFDMA is analysed for unused and underused bandwidths. This method is analysed by using MATLAB simulation tools. Performance analysis results of OFDMA waveforms are studied and analysed for comparison with the CDMA technology.