AG Kommunikationstheorie


PAPR reduction in OFDM systems


High peak-to-average power ratio (PAPR) is an important disadvantage of OFDM systems. High PAPR degrades performance of OFDM signals by forcing the analog amplifier to work in nonlinear region. A simple technique to reduce high signal peaks is to clip them to a maximum allowed value, at the cost of BER degradation and out-of-band transmission. Out-of-band transmission can be reduced by filtering at transmitter and BER degradation can be mitigated by reconstructing the signal at the receiver. We analyzed the performance of commonly used techniques for the reduction of the degradation effects of clipping and proposed an improvement for one of those techniques.

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