Differential modulation and demodulation of multi-frequency digital communications signals - IEEE Conference Publication
`2/20/2018
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`Differential modulation and demodulation of multi-frequency
`digital communications signals
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` P.H. Moose
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`Abstract:
`Multiple-frequency modulation (MFM) is a bandwidth-efficient digital communication signaling technique that may be used effectively in mobile
`satellite communications links. Algorithms for generating and demodulating differentially encoded multifrequency quadrature phase shift keyed
`(MFQPSK) signals using discrete Fourier transform (DFT) techniques are discussed. The theory and a prototype system for differentially encoding
`and decoding MFQPSK in the frequency domain are developed. By using long baud intervals and corresponding small spacing of the carrier tones,
`problems associated with channel fading are greatly relieved with respect to the previous method of differentially encoding the multiple carrier tones
`from baud to baud. An MFM system has been configured to transmit MFQPSK over a 4-kHz bandpass channel. Tone spacings, or baud rates, of
`15, 30, 60, 120, and 240 Hz were tested. Output signal-to-noise ratios were estimated by computing sample means and variances of the real and
`imaginary parts of X/sub a/. Experimental results are presented showing good agreement with the theory.
`
`Published in: Military Communications Conference, 1990. MILCOM '90, Conference Record, A New Era. 1990 IEEE
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`Date of Conference: 30 Sept.-3 Oct. 1990
`
` INSPEC Accession Number: 3916303
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`Date Added to IEEE Xplore: 06 August 2002
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`DOI: 10.1109/MILCOM.1990.117428
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`Publisher: IEEE
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`Conference Location: Monterey, CA, USA, USA
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`IEEE Keywords
`Digital modulation, Demodulation, Magnetic force microscopy, Discrete Fourier transforms, Digital
`communication, Satellite communication, Signal generators, Prototypes, Decoding, Frequency
`domain analysis
`
`INSPEC: Controlled Indexing
`satellite relay systems, decoding, demodulation, digital radio systems, digital signals, encoding,
`mobile radio systems, phase shift keying
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`INSPEC: Non-Controlled Indexing
`4 kHz, multifrequency signals, differentially encoded MFQPSK, output SNR, tone spacings,
`differential modulation, differential demodulation, bandwidth, digital communication signaling,
`mobile satellite communications links, multifrequency quadrature phase shift keyed, discrete
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`2/20/2018
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`Differential modulation and demodulation of multi-frequency digital communications signals - IEEE Conference Publication
`Back to Top
`Fourier transform, encoding, decoding, frequency domain, carrier tones, channel fading, bandpass
`channel, baud rates, 15 Hz, 30 Hz, 60 Hz, 120 Hz, 240 Hz
`
`Authors
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`P.H. Moose
`US Naval Postgraduate Sch., Monterey, CA, USA
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`Petitioner Sirius XM Radio Inc. - Ex. 1008, p. 2
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