The performance study of BER by using different techniques of channel estimation for MIMO-OFDM / Mohd Hazwan Mat Ali

The high transmission data rate, spectral efficiency and reliability are necessary in the future of mobile communications wireless systems. However, there are several problem on the inference that had been faced among the signals, complexity of transmission system and effected the spectral efficiency. The way that used to prevent these problem is by using Orthogonal frequency division multiplexing (OFDM) is another common technique in eliminating the inter symbol interference (ISI) which give the efficient high speed transmission for the best performance. To get a better performance of OFDM, the techniques that were applied to the systems are Discrete Fourier Transform (DFT) based channel estimation and Least Mean Square (LMS) channel estimation. They reduced the noise and help increasing the efficiency in the systems. To get the different performance, the comparison has been made by applying the Multiple Input Multiple Output (MEMO) OFDM with DFT channel estimation and LMS channel estimation. By applying the channel estimation with the multiple antenna system at transmitter and receiver, there will be a better performance of the OFDM system. The result of the performance will be presented with Bit Error Rate (BER) against Energy Bit per Noise Density (Eb/No) that has been done using simulations software MATLAB. The result will shows the BER against Eb/No become lower.