Pulse or digital communications – Receivers – Angle modulation
Patent
1994-05-24
1996-12-17
Chin, Stephen
Pulse or digital communications
Receivers
Angle modulation
375334, 329304, H04L 2714
Patent
active
055861474
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method for demodulating pulse messages, which have been converted into modulated signals, by using quadrature modulation.
When transmitting digitized signals in a wireless manner, as is normal for example in the case of cordless telephones, a miniaturization of the devices for reasons of ease of handling is aimed at, which at the present state of the art can be realized predominantly by an increased application of integrated circuits, that is to say by avoiding analog components.
A radio signal receiver has already been disclosed in GB-A-2 189 114 which, for demodulation of an FSK-signal, has a demodulation arrangement having quadrature modulation means, comparator/conversion means and a coincidence gate for digitally assembling the quadrature components.
SUMMARY OF THE INVENTION
The object on which the invention is based is to specify a demodulation method or a demodulation arrangement wherein a miniaturization of devices used for wireless signal transmission (for example cordless telephones) and integrability of the components used in this case can be achieved in particular by an appropriate embodiment of the demodulators.
In one embodiment of the present invention the method is for demodulating pulse messages, which have been converted into modulated signals, by using quadrature modulation, quadrature components of the modulated signals in the form of analog signals being converted from analog to digital with reference to a threshold value and subsequently assembled digitally by means of coincidence gate logic. The two quadrature components are obtained from the quadrature modulation in the form of analog signals. One quadrature component is differentiated prior to the analog to digital conversion, and the quadrature components, that have been converted from analog to digital, are digitally assembled by means of coincidence gate logic to form the pulse message.
In another embodiment of the present invention the method is for demodulating pulse messages, which have been converted into modulated signals, by using quadrature modulation, quadrature components of the modulated signals in the form of analog signals being converted from analog to digital with reference to a threshold value and subsequently assembled digitally by means of coincidence gate logic. The two quadrature components are obtained from the quadrature modulation in the form of analog signals. One quadrature component is integrated prior to the analog to digital conversion, and the quadrature components, that have been converted from analog to digital, are digitally assembled by means of coincidence gate logic to form the pulse message.
The demodulation method according to the invention is distinguished in that for its application only a single analog component is required, specifically one for carrying out the differentiation or the integration. All other components serve the digital signal processing and can accordingly be produced in integrated circuit technology and are easy to use in terms of circuitry. Therefore, the method according to the invention combines a digitally conditioned signal in the AF range with digital signal processing in the RF range by means of a single analog component.
Advantageous demodulation arrangements for carrying out the methods are as follows.
In one embodiment of the present invention the demodulation arrangement is for demodulating pulse messages, which have been converted into modulated signals, by using quadrature modulation, the quadrature components of the modulated signals in the form of analog signals being converted from analog to digital with reference to a threshold value and subsequently assembled digitally by means of an coincidence gate logic. Of the two quadrature components which have been obtained from the quadrature modulation in the form of analog signals, one quadrature component is differentiated prior to the analog to digital conversion, and the quadrature components that have been converted from analog to digital are assembl
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patent: 5197085 (1993-03-01), Luff et al.
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Kreuzgruber Peter
Schladofsky Werner
Schlager Peter
Chin Stephen
Ghebretinsae T.
Siemens Aktiengesellschaft Osterreich
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