COMPARISON OF VARIOUS NOISE MITIGATION TECHNIQUE USED WITH CLIPPING FOR REDUCTION OF PAPR IN OFDM

Hemant Choubey, Aparna Singh, Amit Shukla

Abstract: A simple technique used to reduce the PAPR of OFDM signals is to clip the signal to a maximum allowed value, at the cost of BER degradation and out-of-band radiation. Clipping does not add extra information to the signal and high peaks occur with low probability so the signal is seldom distorted. Out-of-band radiation can be reduced by filtering at the transmitter, the filter used in this project consists on a FFT-IFFT pair which is easier to implement than traditional FIR filters and allows the implementation of the clip & filter set several times in order to reduce the peak re growth that filtering introduces. The BER degradation can be mitigated by reconstructing the signal at the receiver. We analyzed the performance of the decision-aided reconstruction (DAR) and improved DAR (IDAR) techniques that iteratively try to guess the original symbols and proposed an improvement for one of those techniques.

Keywords: Complementary cumulative distribution function (CCDF),high power amplifier (HPA), Orthogonal Frequency Division Multiplexing (OFDM), Peak-to-Average Power Ratio (PAPR), inter-symbol interference (ISI)

DOI: https://doi.org/10.15623/ijret.2013.0209041