Simulation And Research Of OFDM Based On System View And Matlab

Data transmission in wireless channels with high speed and reliability is required in future wireless systems.OFDM,with the antvantage of high spectrum efficiency and easy realization, can strongly combat multi-path and dispersive channel interference, so its application is remarkable and it will be the key technology of 4G without question. At the same time, software simulation system is especially important for obtaining the best performance and playing a helpful and directive effort, because of the complexity and levity of wireless channel.Firstly, in this paper, development and application of OFDM is brief analyzed. The advantage, disadvantage and hotspots of OFDM is analyzed. The main point that is the academic foundation to the simulation of OFDM is put on the awane speciality, model of wireless channel, the principles of OFDM and it's modulation/demodulation.Secondly, the three key technology of OFDM that is the estimation of channel, reducing PAPR and synchronization of OFDM system is analyzed and studied, especially the arithmetics of baseing on guiding frequency in simulation of OFDM of the paper.Finally, based on the research, the OFDM system fully simulated by System view and MATLAB softwares, it separately accomplished the modulation and demodulation of OFDM under the multipath Rayleigh channel and AWGN channel. It declared that the bit error rate can greatly reduced by OFDM and the OFDM in multipath Rayleigh channel is more adapted to AWGN channel. The simulation not only approved the academic result, but also could remove the shortages, optimize the capability of real system, and also is valuable for project.