A progress report on communications digital signal processing : theory and performance of frequency domain differentially encoded multi-frequency modulation
Moose, Paul H.
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Multi-frequency modulation is a highly bandwidth efficient signalling technique for digital communications. In order to make the technique as insensitive as possible to unknown or fluctuating phase and amplitude changes in the channel transfer function between the transmitter and receiver, frequency domain differential encoding techniques have been developed and their error performance calculated. It is shown that in the range of 2 to 8 bits/Hz of channel bandwidth efficiencies, differential encoding results in a penalty of 3 to 5 db in required Eb /N when compared to fully coherent multi-frequency modulation. Design procedures are presented that provide near optimum QAM constellations for fully differential coding and for the hybrid scheme of differential phase coding and absolute coding of amplitudes.
NPS Report NumberNPS-62-90-012
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