PAPR Reduction Methods in OFDM Systems
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Abstract
For the wireless communication, orthogonal frequency division multiplexing is an attractive technique, due to its several attributes. However, the potentially large peak-to-average power ratio (PAPR) of the transmitting signals has limited its application. This high PAPR causes interference when the OFDM signals are passed through an amplifier which does not have enough linear range. In this paper, methods for PAPR reduction are investigated. There are different methods to reduce the high PAPR like coding, clipping, phase rotation etc. In the paper, four methods: Clipping & Filtering, Selected Mapping, Clipping based Active Constellation Extension and Adaptive Active Constellation are studied. In Clipping & filtering method, as the clipping level is increasing, while in SLM method on increasing the number of OFDM signal frames U, PAPR decreases. In the CB ACE method, PAPR decreases as iteration increases but it results in degradation of BER. While in Adaptive ACE method, PAPR decreases and it causes less error in bits, but complexity increases.
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Keywords: PAPR, Clipping & Filtering, SLM, ACE, OFDM.
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