Alternative Signal Generation for PAPR Reduction by Using Shift Value Set for CSS

U Himavarsha

Abstract


The recent studies under LTE (long term evolution) will give us the knowledge about how to increase the performance of the transmission systems as well as how to increase the data rate. OFDM (Orthogonal Frequency Division Multiplexing) is recent technology which is studied under the LTE. The main advantages of OFDM systems are their ability of providing high data rate as well as low complexity as compared with previous techniques such as TDMA, FDMA and CDMA. The primary advantage of OFDM is its high data rate. But, as we require more and more data rate there is problem with transmission of data i.e. nonlinear distortions are present. This nonlinear distortion famously known as PAPR (peak to average power ratio) another drawbacks like bit error rate, ICI, etc. Several methods are implemented to overcome the drawback of PAPR. Traditional techniques like SLM and PTS, but they are having some drawbacks so there is need to develop the system which will work effectively compared to state of art techniques. Among the available techniques we used here improved PTS technique by applying CSS (cyclic shifted sequence),which will shift OFDM sequence cyclically and after that cyclically shifted sequence is used to generate alternative signal sequence by combining it for PAPR reduction. Execution results in MATLAB shows that the selected SV sets proposed system is giving enhanced output. To get optimized output we applied piecewise linear companding. Piecewise linear Companding is a novel technique which can be integrated with CSS by proper selecting the SV-set. Piecewise linear companding is a signal distortion technique, which will directly applied for publishing.


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