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| A Non-coherent Composite Trellis Demodulation Algorithm of Continuous Phase Modulation |
| Zhou Jia-xi; Li Hui; Dai Xu-chu; Xu Pei-xia |
| Dept. of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei 230027, China |
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Abstract A non-coherent demodulation algorithm of CPM signal based on composite trellis processing is proposed in this paper. This algorithm figures out composite trellis diagram by combining root trellis diagram and multiple component trellis diagrams which are each a phase-displaced version of a root trellis diagram. It takes advantage of trellis coupling transitions between component trellis diagrams, which helps to trace the original phase of CPM signal and frequency offset effectively. Simulation results show the performance of the proposed algorithm approximates coherent demodulation perfectly when the number of component trellis diagram is greater than four. It is more appropriate to the situation of blind demodulation when carrier recovery is difficult.
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Received: 01 September 2008
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Corresponding Authors:
Xu Pei-xia
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2009, Vol. 31 
