Ofdm System Simulation And Performance Analysis

Based on comprehension of the theory and realization of OFDM system, this paper mainly researches and discusses baseband system with OFDM modulation and demodulation. Then it studies several key techniques of OFDM and discusses the applications of OFDM on IEEE802.11a. At the same time, the system simulation and performance analysis are done by System View and Matlab according to above.Based on detailed theoretical analysis and research on OFDM, the influence of OFDM system caused by the excess of multiplied paths over guard interval is simulated by System View. On the technique of windowing, the spectrum of different sub-carriers and windowing are compared by each other by Matlab simulation. On the key techniques of OFDM , by consulting some literature, the Peak-to-Average power ratio, synchronization and channel estimation which are found in application of OFDM system are discussed and studied with some personal views put forward. The figure of unitary frequency excursion and CIR is shown by Matlab. The OFDM system performance is studied and analysed by the BER figures on different transmitted channels. Because of the invisibility of OFDM modulation and demodulation tokens and the realization by hardware in future, personal tokens are made by M-Link. The 64QAM+OFDM modulated baseband simulation is done according to the regulation of OFDM parameters chosen, whereas the feasibility of a project in practice and the feasibility of 3.75bit/s/Hz is validated. Finally, it simulates and studies the application of OFDM on the physical layer of baseband system of IEEE802.11a by System View.