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- W2797773448 abstract "Spectrally efficient partial response continuous phase modulation (CPM)for wireless links is considered. Continuous phase modulation defines constantenvelope phase codes, which are advantageous when using non-linear amplifiers.The channel is an additive white Gaussian noise (AWGN) channel and thespectrum requirement is a mask, which puts stringent requirements on thespectral main lobe and the spectral side lobes.The thesis consist of three papers. In the first paper, a simplifiedreceiver is evaluated for high-complexity partial response CPM on the AWGNchannel. The simplified receiver consists of an approximate filter bank,using simple integrate-and-dump filters, and a reduced state sequence detector(RSSD). The complexity reduction is significant with a very small degradationfor the AWGN channel, with and without co-channel interference, comparedto the optimum maximum likelihood (ML) detector. The simplified receiveris more sensitive to adjacent channel interference, than the maximum likelihood(ML) detector, but a large complexity reduction is still possible witha small performance degradation.In the second paper, convolutionally encoded partial response CPM isevaluated. A search for serially concatenated convolutional codes has beenperformed. The somewhat surprising result is that no coding gain is obtainedcompared to the best uncoded CPM schemes.In the last paper, a numerical optimization of the minimum Euclideandistance with the spectrum mask as constraint and the phase pulse shapeand modulation index as free parameters, has been performed. A small gainin minimum Euclidean distance and an interesting property for some optimizedphase pulses, that could be useful for simplified receivers, were obtained.There seems to be a saturation effect in CPM when using long phase pulses,thus restricting the possibilities to define more powerful constant envelopephase codes within CPM.In addition, complementary simulation results for the 'best' optimizedCPM scheme, taking complexity into account, are provided in an appendix.The advantageous property for the optimized phase pulse over a standardphase pulse, when using a simplified receiver, is demonstrated." @default.
- W2797773448 created "2018-04-24" @default.
- W2797773448 creator A5086726797 @default.
- W2797773448 date "2000-01-01" @default.
- W2797773448 modified "2023-09-27" @default.
- W2797773448 title "On Spectrally Efficient Continuous Phase Modulation" @default.
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