A Non-coherent Composite Trellis Demodulation Algorithm of Continuous Phase Modulation

Zhou Jia-xi; Li Hui; Dai Xu-chu; Xu Pei-xia

doi:10.3724/SP.J.1146.2008.01075

Volume 31 Issue 9

Dec. 2010

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Article Navigation > Journal of Electronics & Information Technology > 2009 > 31(9): 2137-2142

Zhou Jia-xi, Li Hui, Dai Xu-chu, Xu Pei-xia. A Non-coherent Composite Trellis Demodulation Algorithm of Continuous Phase Modulation[J]. Journal of Electronics & Information Technology, 2009, 31(9): 2137-2142. doi: 10.3724/SP.J.1146.2008.01075

Citation:

Zhou Jia-xi, Li Hui, Dai Xu-chu, Xu Pei-xia. A Non-coherent Composite Trellis Demodulation Algorithm of Continuous Phase Modulation[J]. Journal of Electronics & Information Technology, 2009, 31(9): 2137-2142. doi: 10.3724/SP.J.1146.2008.01075

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A Non-coherent Composite Trellis Demodulation Algorithm of Continuous Phase Modulation

doi: 10.3724/SP.J.1146.2008.01075

Received Date: 2008-09-01
Rev Recd Date: 2009-05-21
Publish Date: 2009-09-19

Abstract

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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References

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