Abstract
Multicarrier transmission, also known as (OFDM) Orthogonal Frequency Division multiplexing, in wireless communications, it has been proven to be an essential technique for countering multipath fading. It has been used successfully for HF radio applications and has been selected as the interface for digital audio transmission, digital terrestrial TV broadcasting, and high-speed wireless local area networks in Europe. In this paper, we suggested a new design for modeling multipath fading channels, such as the Laplace fading channel, in order to discover new simulation results and effects. Furthermore, the variance of the Laplace fading channel has been computed and the new Bit Error Rate (BER) derivation is established, and the performance of (M-QAM), M-ary Quadrature Amplitude Modulation (with M=4 over OFDM system under Laplace fading channels in Additive White Gaussian Noise (AWGN) is discussed and compared to the conventional M-QAM/OFDM system Rayleigh fading channel in AWGN. All the simulation results are examined using the optimum signal detection based on the Euclidean distance and evaluated using Monte-Carlo simulation.
Highlights
In wireless communications, the efficiency of the transmission and receiving systems is critical
OFDM is essential in systems of wireless and mobile communication because OFDM systems can deal with the impact of channel environment[1]
This paper evaluates the BER performance of 4QAM/OFDM over different scenarios of Laplace fading channel in additive white Gaussian noise (AWGN) by using an optimal detector based on the closest signal to the received signal (Euclidean distance)
Summary
The efficiency of the transmission and receiving systems is critical. This paper evaluates the BER performance of 4QAM/OFDM over different scenarios of Laplace fading channel in AWGN by using an optimal detector based on the closest signal to the received signal (Euclidean distance). The major contributions of this paper are related to BER Performance analysis of 4QAM/OFDM over different scenarios of Laplace fading channel are as follows: The effective probability distribution and the effective SNR distribution of the Laplace fading channel in the frequency domain at the OFDM demodulator output are derived with the help of the central limit theorem (CLT). We detect the received signal by using an optimum detector based on the Euclidean distance depending on the derived effective probability distribution at the OFDM demodulator output.
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