Abstract
Orthogonal Frequency Division Multiplexing (OFDM) offers a high spectral efficiency, smooth operation and effectiveness against multipath fading as its modulation technique. This modulation technique advancement is to increase the number of subcarriers to enhance efficiency. Despite of the number of subcarriers increases, certain time domain OFDM coefficients are likely to acquire unwanted high magnitudes of PAPR. This high PAPR cause the limit of the transmitter power efficiency. Therefore, cause spectral to spread and reduce the bit-error-rate (BER) performance. In order to allay these potential performance problems, a computationally efficient and low cost PAPR reduction method were proposed. The new method presents a combination of Statistical Redistribution Method (SRM) with Selected Mapping Method (SLM). The proposed scheme takes advantage of Selected Mapping (SLM) followed by the companding SRM technique to amplify the reduction of the PAPR of the OFDM signal. Simulation results indicate that about 5 dB reduction in PAPR is achieved compared with the conventional SLM algorithm.
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