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The method of LDPC coded rotational modulation in OFDM systems is presented in this paper. This method obtains more coding gain modulation compared to traditional coded modulation techniques in fading channels. The results of simulation show that coded modulation gain of rotation modulation is more apparent than that of non-rotation modulation, and it is more apparent with high bit-rate. In addition,...
This article introduces two typical means of spectrum sensing in CR: energy detection and cyclostationary detection. Two methods are used to verify the feasibility and detect authorized user in CR-OFDM system. It illustrates that how to choose parameters when detect the OFDM signals by MATLAB. It compares the superiorities and deficiencies of the two ways, then puts forward the improved solution.
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