Techniques to Tackle High Peak- To-mean Envelope Power Ratio

I certify that the work submitted is my own and that any material derived or quoted from the published or unpublished work of other persons has been duly acknowledged (ref. UPR AS/C/6.1, Appendix I, Section 2 – section on cheating and plagiarism) Abstract Emerging wireless systems envisage properties of; power and bandwidth efficiency, low cost transceivers (to encourage more users) and increased data rate. Multi-carrier modulation (MCM) techniques have posed a suitable candidate to meet these requirements, their spectral effectiveness and robustness against multipath fading channels has made them promising applications for future wireless systems. Orthogonal Frequency Division Multiplexing (OFDM) has emerged one of the main modem schemes of MCM for its high data rate and bandwidth efficient properties. However a limiting factor to the adoption of OFDM is its high peak-to-mean envelope power ratio (PMEPR). The PMEPR problem requires analog devices operating in large linear regions resulting in undesirable cost and power implications. Consequently research has focused on PMEPR reduction via various distortion-less and distortion techniques. These techniques achieve PMEPR reduction at the expense other performance parameters. Thus no specific PMEPR reduction technique offers the best solution for all OFDM systems, rather the performance of PMEPR reduction techniques should be investigated such that they are carefully selected to meet specific application requirements. This report analyzes the operation of OFDM systems and the implementation of various PMEPR reduction techniques. The behaviour of the PMEPR relative to system parameters and the performance of the clipping algorithm for PMEPR reduction are analyzed via simulations.