Bonfring International Journal of Research in Communication Engineering
Online ISSN: 2277-5080 | Print ISSN: 2250-110X | Frequency: 4 Issues/Year
Impact Factor: 0.528 | International Scientific Indexing(ISI) calculate based on International Citation Report(ICR)
PAPR Reduction by Hybriding PTS-APPR Method to Improve the QoS in OFDM Systems
Dr.M.G. Sumithra, A.K. Devika and M. Sarumathi
Abstract:
OFDM (Orthogonal Frequency Division Multiplexing) technique has been widely adopted in many wireless communication systems due to its high data-rate transmission ability and robustness to the multipath fading channel. One major drawback of the OFDM signal is the high peak-to-average power ratio (PAPR) problem. The high PAPR results in the in-band distortion and out-of-band radiation when the OFDM signal is fed into a nonlinear power amplifier (PA).Large fluctuations of OFDM signal amplitude represents a major drawback for amplification in mobile communication systems. OFDM has many orthogonally modulated subcarriers which unexpectedly produce a peak to average power ratio (PAPR) and it leads to reduce the power efficiency of a RF amplifier. This Paper proposed a novel cascaded approach of peak to average power reduction by cascading Conventional Partial transmit sequence(PTS) method with Adaptive peak power reduction (APPR) method. A sequence of input data is rearranged by PTS for the reduction of PAPR and then fed into the APPR process in the proposed system. The APPR method controls the peak levels of the modulation signal by an adaptive algorithm. It reduces the probability of occurrence of peak in OFDM signal. Simulation results have shown that the proposed cascaded method introduces better PAPR reduction compared to the conventional PTS and the conventional APPR method.
Keywords: OFDM, PAPR, CCDF, PTS, APPR, SNR, BER
Volume: 2 | Issue: Special Issue on Communication Technology Interventions for Rural and Social Development
Pages: 15-20
Issue Date: February , 2012
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