A Novel Alternative Signal Generation for PAPR Reduction in OFDM using Shift Value Set for CSS
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2017, Vol 5, Issue 7
Abstract
The implementation of the orthogonal frequency division multiplexing (OFDM) in a wireless communications domain has introduced the world a new communication model which can offer 100 Mbps speed with minimum disadvantages. The transmit signals in an orthogonal frequency-division multiplexing (OFDM) system can have high peak values in the time domain since many subcarrier components are added via an inverse fast Fourier transformation (IFFT) operation. As a result, OFDM systems are known to have a high peak-to-average power ratio (PAPR) when compared to single-carrier systems. In fact, the high PAPR is one of the most detrimental aspects in an OFDM system as it decreases the signal-to-quantization noise ratio (SQNR) of the analog-digital convertor (ADC) and digital-analog convertor (DAC) while degrading the efficiency of the power amplifier in the transmitter. The PTS scheme is considered as the best PAPR reduction technique and the cyclic shifted sequences (CSSs) scheme evolved from it has achieved the significant. The concept of CSS is to cyclically shifted the OFDm sequences to and then combined to generate the alternative signal sequences and the accuracy of the CSS scheme les in the careful selection of the shift value (SV) sets which directly related to PAPR reduction. In simulation results, the SV sets are carefully selected and its validation is approved by performing the simulations on the Selected SV sets.
Authors and Affiliations
B. Nagababu, J. Ravindranadh
Keywords
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