EP0065764B1
Expired / Lapsed
EP
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Digital radio system
Assignee: Siemens AG
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Filing: 1982-05-19
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Granted: 1986-03-26
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Expires: 2002-05-19
Abstract
No abstract record available.
Inventors
- 👤 Wolfram Dipl.-Ing. Schwarz
- 👤 Theodor Dipl.-Ing. Schwierz
- 👤 Bernd Dipl.-Ing. Sommer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 12:23
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/12; H04L; H04L1/00; H04L1/02; H04L1/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
164 words
A digital radio system, in particular for troposcatter- and short wave connections, wherein at the transmitting end the digital useful signal is fed to the input of the frequency modulator (M) in order that it be supported on a frequency raster comprising at least three radio frequencies together with at least one additional oscillation, and in fact an additional fundamental oscillation which determines the frequency (fz0) of the raster spacing in the radio-frequency frequency raster, and wherein at the receiving end the radio-frequency carriers of the frequency raster, each modulated with the useful signal, are combined via a combiner (K) to form a sum signal which exhibits an optimum signal-to-noise ratio, characterised in that the radio-frequency, useful-signal- modulated carriers of the frequency raster are determined, taking into account the Bessel functions and the phase thereof, for at least approximately equal amplitudes, in that the additional fundamental oscillation and further additional harmonics are adjustable in amplitude and the additional harmonics are additionally adjustable in phase.
Claim 2
Dependent Claim
164 words
A digital radio system, in particular for troposcatter- and short wave connections, wherein at the transmitting end the digital useful signal is fed to the input of the frequency modulator (M) in order that it be supported on a frequency raster comprising at least three radio frequencies together with at least one additional oscillation, and in fact an additional fundamental oscillation which determines the frequency (fz0) of the raster spacing in the radio-frequency frequency raster, and wherein at the receiving end the radio-frequency carriers of the frequency raster, each modulated with the useful signal, are combined via a combiner (K) to form a sum signal which exhibits an optimum signal-to-noise ratio, characterised in that the radio-frequency, useful-signal- modulated carriers of the frequency raster are determined, taking into account the Bessel functions and the phase thereof, for at least approximately equal amplitudes, in that the additional fundamental oscillation and further additional harmonics are adjustable in amplitude and the additional harmonics are additionally adjustable in phase.
Claim 3
Dependent Claim
58 words
A digital radio system as claimed in claim 1, characterised in that the useful-signal-modulated, radio-frequency carriers of the frequency raster incoming at the receiving end are firstly all converted in a converter oscillator arrangement (OA) into the same frequency position, and then, prior to their demodulation, are combined via the combiner (K) to form the desired sum signal.
Claim 4
Dependent Claim
33 words
A digital radio system as claimed in claim 1 or 2, characterised in that at least one additional harmonic is provided for the compensation of undesired secondary lines of the radio-frequency frequency raster.
Claim 5
Dependent Claim
30 words
A digital radio system as claimed in one of the preceding claims, characterised in that the radio-frequency transmission spectrum is approximately equal in breadth to half the occurring coherence bandwidth.
References Cited (Backward Citations)
No citation records indexed.
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