Research Of Multichannel Software Radio Receiver

The basis idea of software radio (SRD) is to place the A/D and D/A close up the antenna as possible as and use software to realize all the function of any radio based on an opening and blocking currency hardware platform.Above all in this paper the technique of sample, sampling rate conversion, modulation and demodulation is discussed. Based on upper discuss the application of the down digital converter and the sampling of bandpass is researched. The project utilizing cascaded integrator comb filter,half band filter and finity impulse filter to design the down digital converter is put forward and system simulation is accomplished and simulated. Then the model of the real signal receiver is established after investigating the application of polyphase filter in channelized receiver. Giving the formula of the center frequency and bandwidth of real channel, analyzing the complexity of the arithmetic and finishing the system simulation of four channels software receiver based on the model.All the system simulation platforms can offer convenience for the future . research. We can use them to replant any communication system and test its performance, so they are very useful.