Abstract
In this paper, Discrete Wavelet Transform (DWT) Orthogonal Frequency Division Multiplexing (OFDM) system is compared with Discrete Cosine Transform (DCT) and Discrete Fourier Transform (DFT) OFDM systems. The channel noise is modelled with A white Gaussian Model (AWGN), the fading is the impairment in the channel and modelled by Rayleigh fading which is frequency selective fading channel and flat fading channel. The comparisons of Peak to Average Power Ratio (PAPR) and Bit Error Rate (BER) are made using modulation techniques such as Differential Amplitude and Phase Modulation (DAPM), Quadrature Amplitude Modulation (QAM) and Pulse Amplitude Modulation (PAM). Simulation results shows that PAPR is 4.497 dB for DWT-DAPM combination, 4.684 dB for DWT-QAM combination and 6.211 dB for DWT- PAM combination at 10-3 Complementary Cumulative Distributive Function (CCDF).The performance Analysis with the combination of DFT, DCT with DAPM, QAM and PAM are also compared. The BER is 0.01816, 0.01806 at 20 dB SNR in frequency selective channel, flat fading channel for DWT-DAPM and for DWT- QAM, AWGN channel BER is 0.01765 at 20dB SNR.
Highlights
In this communication era, Orthogonal Frequency Division Multiplexing (OFDM) is a modulation technique which is multi-carrier in nature which provides a powerful means to carry high speed data streams on a multipath fading, the path that causes Intersymbol interference (ISI) [1]
The OFDM signal is composed by large peak amplitudes which results in increased amount of inter carrier modulation caused by the linear power amplifiers (LPA)[2], this results in large Peak to Average Power Ratio (PAPR) and Bit Error Rate (BER)
The performance evaluation for PAPR and BER is done for the proposed system with conventional methods such as Discrete Fourier Transform (DFT), Discrete Cosine Transform (DCT) and modulation techniques like Quadrature Amplitude Modulation (QAM) and Pulse Amplitude Modulation (PAM) in the A white Gaussian Model (AWGN) channel, frequency selective fading and flat fading channel
Summary
OFDM is a modulation technique which is multi-carrier in nature which provides a powerful means to carry high speed data streams on a multipath fading, the path that causes Intersymbol interference (ISI) [1]. In reference 10, the effect of different wavelet families such as Haar, Daubechies, Symlets, coiflets and Biorthogonal are analysed, the difference between the better PAPR value and less PAPR value is approximately about 4.5dB for bior 2.4 and coif 1 wavelets [10]. From this literature, Wavelet is a promising technique that will reduce the PAPR better than the other techniques but still there are avenues that PAPR can be reduced by using the combination of different modulation techniques with wavelets. The performance evaluation for PAPR and BER is done for the proposed system with conventional methods such as DFT, DCT and modulation techniques like QAM and PAM in the AWGN channel, frequency selective fading and flat fading channel
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