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| Spectrum Line Feature Analysis for Digital Communication Signals |
| Yang Lin①; Xu Xiao-dong①; Lu You-rong②; Dai Xu-chu①; Xu Pei-xia① |
①Department of EEIS, University of Science and Technology of China, Hefei 230027, China;
②Southwest Institute of Electronic and Telecommunication Technology, Chengdu 610041, China |
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Abstract Digital communication signals of different modulation schemes, with the nonlinearities applied to the complex envelope, always manifest themselves in spectrum line feature. In this paper, a complete theoretical analysis for the square and quartic spectrum line feature is carried out. The spectrum line’s existence, position and amplitude are deduced, which can server as a robust feature for potential application. Computer simulation results indicate that the spectrum line can be extracted even in the serious noisy and multi-path fading environment.
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Received: 27 February 2008
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2009, Vol. 31 
