Bit Error Rate (BER) improvement of Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system using bit level scrambling

The work in the field of wireless communication these days is directed towards the efficient usage of the available spectrum as the spectrum scarcity keeps haunting people in general and communication engineers in particular. This puts an upper limit on the development of new spectrum hungry applications. Spectral efficiency has thus given new direction to the researchers to look for the available option for better utilization of spectrum and to develop techniques that will be compatible with the existing technology. The work presented in this paper is also an attempt towards this direction. The idea is to use the Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) for transmission of image data with improved Bit Error Rate (BER) and Pixel Error Rate (PER) as the performance of most of the communication systems developed is measured, in the most common parlance, in terms of BER. The bit error has been improved using bit level scrambling in addition to the convolutional coding. A MATLAB program has been developed to model the MIMO-OFDM system. The model under consideration prompts the user for various inputs and then produces the results in terms of various plots and graphs. The results confirm the significant improvement in the BER and PER of the system.