Research And Application Of Ofdm System

This paper concentrates on the orthogonal frequency division multiplexing(OFDM) technique and some techniques to resist multipath fading. Eliminate ISI through use of a cyclic prefix. Diversity techniques.Using adequate OFDM combined with channel coding(COFDM) can enhance the ability to lower the effect of multipath fading. Frequency-domain equalization .At the same time discusses some key problems in OFDM: high ratio of Peak-to-Average power of output signals, problem of synchronization, channel estimation,adaptive bit, power and subcarrier allocation. Emphasize on channel estimation,and present a new algorithm which can filtering more interpolation errors and noise. For the sake of improve the performance of resist narrowband noise and make efficient use of the spectrum apply Malvar wavelet division. Other than above, this paper also compare the methods of OFDM combine CDMA,emphase on the study of the exam technique of MC-CDMA .In the end gives the baseband computer simulation by Systemview.