| Summary: | 碩士 === 國立中央大學 === 電機工程研究所 === 91 ===
Block coded approaches for differentially coherent MPSK modulative signals
in AWGN channel
Advisor：Dr. Char-Dir Chung Student: Kai-Lei Hsu
ABSTRACT
Block coded modulation (BCM) is a bandwidth efficient scheme which can increase the reliability of digital communications. This system results from the combination of block coding and modulation. It is mostly applied to the additive white Gaussian noise (AWGN) channel, maximizing its minimum squared Euclidean distance (MSED).
The thesis studies the use of differentially coherent detection in block coded modulation systems, using block-by-block and symbol-by-symbol approaches. To further improve the error performance of considered systems, two ways of decision feedback differential detection (DFDD)─the multiple-symbol differential detection techniques, have been also considered.
Anther topic concentrated in channels that introduce into the carrier a random frequency shift, classical differentially coherent detection for BCM system is not suitable in use. Therefore, we propose double differential detection scheme to overcome this situation and gain good performance without frequency interference.
Keywords:
BCM, differentially coherent detection, double differential detection, frequency shift, decision feedback differential detection.
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