BER PERFORMANCE ANALYSIS OF M-QAM IN WAVELET-BASED OFDM WITH COMBINED PAPR REDUCTION TECHNIQUE THROUGH AWGN RAYLEIGH CHANNEL

Abstract

The usage of Orthogonal Frequency Division Multiplexing (OFDM) is common in wireless communication, due to the fact that it provides a way to utilizes less bandwidth to send more information compared to single carrier. The implementation can be further improved by combining it with Quadrature Amplitude Modulation (QAM). Normally, the OFDM is implemented by using FFT and IFFT for the signal. However, it has a relatively high PAPR, which is not efficient for the power usage. To overcome this problem, there are several techniques that can be implemented. The first one is the wavelet-based OFDM to replace the FFT-based OFDM. The second one is the Partial Transmit Sequence (PTS) technique. The third one is the clipping technique. Several researchers have done the performance analysis of each technique independently. In this research, a simulation is performed to do the analysis of BER and PAPR for the combined PAPR reduction techniques. The simulation has been successfully conducted in 16, 64, 256, and 1024 QAM. The combined techniques provide a lower PAPR compared to previous works by a value that is ranging from 2 dB to 7 dB lower. As for the BER performance, the best combination is not constant, thus vary with the QAM used. A trade-off between BER and PAPR performance is also found in this work, where the best BER performance may be achieved while worsen the PAPR performance, or otherwise.