Design Of Digital Filter Based On FRM In Multi-Carreier Communication

In the bandwidth wireless digital communication system , the most type of interference which influences the information high speed transmission is the decline of the frequency selectivity caused by multipath effects of letter way. Currently, it is widely concerned that the representative as Orthogonal Frequency Division Multiplexing (OFDM) carries wave technique with its high utilization of the frequency chart and strong ability of the anti-multipath interference. By the development of the integrated circuit the multi-carrier modulation implemented by digital filter becomes new important research topic.Different from the general filter set, the design of a filter set is simply. It only needs to design an efficiently low prototype filter, other filters are immediately produced by modulating the prototype filter. This thesis mainly designs the efficient prototype filter and modulation filter set using the method of Frequency-Response Masking(FRM) and simulates them using MATLAB software.This paper firstly introduces the knowledge of multi-carries modulation foundation technique and the design method of the digital filter, then based on this the paper provides the new design which uses the method of Frequency-Response Masking(FRM) and the digital filter set from design the efficient filter.