The Research Of Modulation And Demodulation Based On Software Radio

This topic come from chongqing municipal education commission,the research of multi-mode modem based on software radio.The main work that carry on is as follows:①studied many modes within the software wirelesses to make the solution to adjust the basic principle, mainly include the quadrature basedband signal to take and the calculate way of digital up conversion. To the AM, SSB( LSB, USB), DSB,2PSK,2FSK these five kinds of digital signal make the discussion of the calculate way.②studied the demodem solution based on the software radio.Based on the numerical signal of the quadrature transformation theories, get the general quadrature model for demodem, at the same time, this text makes the discussion about five kinds of signals to digital.③studies the problem to make the signal in the software wireless receiver of identify automatically above-mentioned several kinds.This text make the analysis of identify the calculate way according to the characteristic parameter, to the AM, LSB, USB, DSB,2PSK,ASK, 2FSK,4FSK,make the analysis to the style signal to identified automatically, and design the frame diagram for it, at the same time putting forward other characteristics parameter exaltation the rate of identify.