Tone Reservation Technique Based Clipping and Filtering Method for PAPR Reduction by Scaling Residual noise
Journal Title: International Journal of Research in Computer and Communication Technology - Year 2016, Vol 5, Issue 4
Abstract
OFDM is an extinguishly used next-generation wireless transmission technique because of its easy equalization. OFDM can send over hundreds of parallel data streams via multiple carriers which makes the possibility of large data transfer. OFDM has two major drawbacks namely inter-symbol interference (ISI) problem and peak-to-average power ratio (PAPR). Coherent addition of independently modulated carriers, of an OFDM signal can give a large peak-to-average power ratio. Among those PAPR reduction methods, clipping method is the simplest method to use. However, using Clipping causes both in-band distortion and out-of-band distortion which are undesirable but this can be reduce by using filtering after Clipping. Another Possibility of PAPR reduction can be reserving several tones to generate a peak-cancelling signal (PCS). However, this method suffers from high computational complexity. To address this problem, this paper proposes a simple algorithm using residual noise reduction which is left after clipping and Filtering to satisfy tone reservation (TR) constraints and scaling with a scaling factor determined to minimize the out-of-range power generates the PCS. Our Simulations show a significant reduction in PAPR and Error rates.
Authors and Affiliations
Siva Prasad Valluri, Prashant K Shah
Keywords
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