Modulation Recognition Of OFDM Signals In Satellite Communication

The technology of modulation recognition makes an important fact in none collaboration communications and software radio, which is the key step in signal processing or intelligentized analysis. this paper discussed some method of modulation recognition of OFDM signals in satellite communications, achieved the outcome of modulation blind detection of OFDM signals: The recognition of ofdm signal in satellite communications mainly contains signal sampling, prepreament, character pick_up, set the detection threshold and get the results.Firstly, the transmit system chart of OFDM signals in satellite communications was givn, and the emulation of the system by the software of Simulink was realized.Secondly, analyzing the model of the satellite channel. the CMA arithmetic was used in blind channel equalization so as to wipe off the infection of the satellite channel.Finally, using the method of 4th cumulation, we recognized the OFDM signals from the other single carrier signals. Through the eigenvector and geometrical distance, we realized the blind detection of sub-carrier of OFDM signals. These were all simulated in Matlab.In engineering practice, the algorithms in this paper were simulated in Matlab. Both theoretical analysis and engineering practice justify the capability of the algorithms.