BER Analysis for Quadrature Amplitude Modulation in MIMO-OFDM System

Electronics and Communication Engineering

The transmitter is a 4x4 MIMO antenna mode with Quadrature Amplitude Modulation (QAM) scheme is used to increase the SNR and to decrease the BER of the system. Here channel coefficient is evaluated and BER, PER, FER and capacity of the channel is improved. Here 10000 bits are given as input. As this whole system operates under Orthogonal Frequency Division Multiplexing (OFDM) scheme, various sub-carriers are allocated in the range of 8, 16 or 32. Also here, the relays are used perform the switching operation. The two types of relaying schemes used here are Amplify-and- Forward relay and Decode-and- Forward relay. Then the channel used here is Rayleigh fading channel and Additive White Gaussian Noise (AWGN) is added to the channel to minimize the effect of random processes that occur naturally. The channel coefficient and also the channel capacity is analyzed to illustrate the growth of the individual channels. Based on the relaying schemes the outputs from different channels are combined using Maximal Ratio Combining (MRC) or Equal Ratio Combining (ERC). At last proper demodulation is performed and the signal reaches the destination where proper PDFs and CDFs are used to analyze BER and SNR. The system runs under an algorithm called Water-Filling algorithm which is a method of power optimization algorithm to obtain high throughput and to improve the performance.

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