Study of Tranmission Characteristics of 2x2 Mimo System for Different Digital Modulation Using Ofdm and Stbc Multiplexing Techniques and Zf Equalizer Receiver
نویسنده
چکیده
A detailed analysis of the performance of 2×2 Multiple Input Multiple Output (MIMO) antenna system has been carried out by determining the transmit diversity using Orthogonal Frequency Division Multiplexing (OFDM) techniques. The transmission characteristics are determined for BPSK, QPSK and 16-QAM modulation. Additive White Gaussian Noise (AWGN) has been used presuming flat fading Rayleigh channel. On the receiver side, linear equalization techniques such as Zero Forcing (ZF) were employed for computing the BER performance. The simulation results show that for BER of ~10, the SNR achieved are found to be significantly high. The results indicate SNR ~32dB for BPSK modulation, the SNR ~37dB for QPSK modulation and the SNR ~40dB for 16-QAM modulation over OFDM transmission. The MIMO OFDM multiplexing schemes show a overall improvement of ~ 8 dB for BER values of 10 between 16-QAM modulation and BPSK modulation. Further a detailed comparison of the performance of OFDM multiplexing with STBC multiplexing for MIMO transmission shows large improvement in BER performance for OFDM with digital modulation. The simulations results are presented and discussed in the paper.
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