Abstract
MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) uses multiple antennas at transmitter and receiver side to facilitate high throughput performance without needing additional bandwidth or transmission power. But frequency synchronization, Inter Carrier Interference (ICI) minimization and antenna diversity are the main challenges for MIMO-OFDM wireless technology. In this paper, a MIMO-OFDM hybrid model is designed with proper frequency synchronization and antenna diversity that minimizes ICI with improved signal strength. Using the model a comprehensive analysis in terms of Bit Error Rate (BER) performance with respect to Signal to Noise Ratio (SNR) and Bit Rate for different M-ary QAM modulation schemes and different MIMO configurations are presented over Rayleigh fading and AWGN channel. After an extensive analysis, it is found that the propose OFDM scheme shows better Bit Error rate (BER) performance for 64-QAM than any other M-ary QAM modulation schemes and the optimum MIMO configuration for this good quality performance is found to be 3×2 configuration.
Highlights
The demand for a high speed wireless communication, which is spectrally efficient as well as reliable, is getting higher and higher by the explosive growth of wireless communication over the recent years
We have proposed a Multiple Input Multiple Output (MIMO)-orthogonal frequency division multiplexing (OFDM) model over Rayleigh fading and Additive White Gaussian Noise (AWGN) channel with limited bandwidth spectrum
Filling up the guard intervals with the zeroes is known as zero padding, whereas if the last samples are copied to the starting of the OFDM symbol or first samples are copied to the ending of the OFDM symbol it is known as cyclic prefix or cyclic suffix respectively
Summary
The demand for a high speed wireless communication, which is spectrally efficient as well as reliable, is getting higher and higher by the explosive growth of wireless communication over the recent years. Using the developed MIMO-OFDM model a comprehensive comparative analysis is carried out among different M-ary QAM modulation schemes and different MIMO configurations in order to find out the combination of best modulation scheme and best MIMO configuration providing lowest Bit error rate (BER). This analysis will be extremely useful for the researchers to have a complete overview of the performance of MIMO-OFDM technology that uses M-ary QAM modulation schemes over Rayleigh fading and Additive White Gaussian Noise (AWGN) channel
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