| Summary: | 碩士 === 國立高雄第一科技大學 === 電腦與通訊工程研究所 === 102 === In this paper, we analysis and research the feasibility for a continuous phase modulation with a time-limited phase shaping pulse (Continuous Phase Modulation Time-Limited, CPM-TL) using differential phase detection (Differential Phase Detection, DPD) . Instead of using a maximum likelihood sequence (MLSE) receiver for optimal CPM signal is demodulated, the best receiver requires complex coherent technology, the receiver of the differential demodulate is very simple and can be performed symbol-by-symbol demodulation, which can effectively reduce the cost of the receiver. Hhowever, CPM-TL is different from conventional CPM structure, the conventional is on the feedback structure by itself. So, there is no external precoder, but the CPM-TL need. In this paper, we focused on two kinds of CPM-TL Modulation: 2REC-TL and 3REC-TL analysis phase pulse shaping its coding structure to construct the corresponding precoder, so as to satisfy the required difference demodulation phase, whereby deduced difference demodulators.
To find out of the method of differential demodulation, We have different modulation error rate coefficients in the white noise simulation results show that the proposed receiver can differ symbol-by-symbol demodulation and error rate with the best receivers in only about 1.0dB to 7.5dB loss, however, the relative complexity simplify many. This thesis has not yet considered fading channels.
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