US5564076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable digital signal transceiver providing communication via a terrestrial network and via a satellite network
Assignee: Alcatel CIT SA
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Filing: 1994-06-21
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Granted: 1996-10-08
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Expires: 2014-06-21
Abstract
Abstract A dual mode portable digital radio transceiver for communicating via a terrestrial network (first mode) and via a satellite network (second mode) synthesizes a modulation first frequency for modulation of signals transmitted in both modes and a conversion second frequency for demodulation of signals received in the two modes. It divides the conversion second frequency supplying a conversion third frequency for demodulation of signals received in one of the modes using a signal receive frequency band far away from the other frequency bands used. It is therefore possible, using a single synthesized pure carrier, to carry out direct conversion in a first mode and intermediate frequency conversion followed by the same direct conversion in the second mode.
Inventors
- 👤 Gerard Auvray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:38
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/005; H04B1/0053; H04B1/0057; H04B1/0096; H04B7/00; H04B7/14; H04B7/15; H04B7/185; H04B7/1853; H04B7/18563
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
196 words
A dual mode portable digital signal transceiver providing communication in a terrestrial mode and a satellite mode, said transceiver providing communication in said terrestrial mode via a terrestrial network using a terrestrial transmit frequency band and a terrestrial receive frequency band, said transceiver providing communication in said satellite mode via a satellite network using a satellite transmit frequency band and a satellite receive frequency band, said terrestrial transmit frequency band and said satellite transmit frequency band being substantially adjoining, and defining transmit bands of said transceiver, and said terrestrial receive frequency band and said satellite receive frequency band being far apart, and defining receive bands of said transceiver, said transceiver comprising: synthesizer means for synthesizing a first frequency for modulation and a second frequency for demodulation; and divider means for dividing said second frequency to supply a third frequency for demodulation; wherein signals transmitted in any of said transmit bands of said transceiver are modulated using said first frequency, wherein signals received in one of said receive bands of said transceiver are demodulated using said second frequency, and wherein signals received in another of said receive bands of said transceiver are demodulated using said third frequency.
Claim 2
Dependent Claim
196 words
A dual mode portable digital signal transceiver providing communication in a terrestrial mode and a satellite mode, said transceiver providing communication in said terrestrial mode via a terrestrial network using a terrestrial transmit frequency band and a terrestrial receive frequency band, said transceiver providing communication in said satellite mode via a satellite network using a satellite transmit frequency band and a satellite receive frequency band, said terrestrial transmit frequency band and said satellite transmit frequency band being substantially adjoining, and defining transmit bands of said transceiver, and said terrestrial receive frequency band and said satellite receive frequency band being far apart, and defining receive bands of said transceiver, said transceiver comprising: synthesizer means for synthesizing a first frequency for modulation and a second frequency for demodulation; and divider means for dividing said second frequency to supply a third frequency for demodulation; wherein signals transmitted in any of said transmit bands of said transceiver are modulated using said first frequency, wherein signals received in one of said receive bands of said transceiver are demodulated using said second frequency, and wherein signals received in another of said receive bands of said transceiver are demodulated using said third frequency.
Claim 3
Dependent Claim
100 words
The transceiver according to claim 1, further comprising: modulation means on two paths in phase quadrature, controlled by said first frequency, for carrying out direct conversion modulation of signals transmitted in said transmit bands; first conversion means on two paths in phase quadrature, controlled by said second frequency, for carrying out direct conversion demodulation of signals received in said one of said receive bands; and second conversion means, controlled by said third frequency, for mixing said third frequency with signals received in said another of said receive bands to supply intermediate frequency signals for demodulation by said first conversion means.
Claim 4
Dependent Claim
92 words
The transceiver according to claim 2, further comprising: first coding and decoding means for coding digital signals to be transmitted in said terrestrial mode according to a first type of coding, and second coding and decoding means for coding digital signals to be transmitted in said satellite mode according to a second type of coding; wherein said modulation means and said first conversion means are selectively connected to either said first or said second coding and decoding means depending upon which one of said terrestrial mode and said satellite mode is used.
Claim 5
Dependent Claim
61 words
The transceiver according to claim 2, further comprising: a first antenna for receiving signals in said one of said receive bands, for transmitting signals in said terrestrial transmit frequency band, and for transmitting signals in said satellite transmit frequency band, wherein said one of said receive bands, said terrestrial transmit frequency band, and said satellite transmit frequency band are substantially adjoining.
Claim 6
Dependent Claim
49 words
The transceiver according to claim 4, further comprising: a second antenna for receiving signals in said another of said receive bands; wherein said first antenna is directly associated with said first conversion means and said modulation means, and wherein said second antenna is associated with said second conversion means.
Claim 7
Dependent Claim
33 words
The transceiver according to claim 5, further comprising: means for selecting one of said first or said second antenna depending upon which one of said terrestrial mode and said satellite mode is used.
Claim 8
Dependent Claim
72 words
The transceiver according to claim 1, wherein: said divider means divides by N, where N is a integer substantially equal to ±f r1 /(f r2 -f r1 ), and where either (1) f r1 corresponds to said terrestrial receive frequency band and f r2 corresponds to said satellite receive frequency band, or (2) f r1 corresponds to said satellite receive frequency band and f r2 corresponds to said terrestrial receive frequency band.
Claim 9
Dependent Claim
61 words
The transceiver according to claim 1, further comprising: a first antenna for receiving signals in said one of said receive bands, for transmitting signals in said terrestrial transmit frequency band, and for transmitting signals in said satellite transmit frequency band, wherein said one of said receive bands, said terrestrial transmit frequency band, and said satellite transmit frequency band are substantially adjoining.
Claim 10
Dependent Claim
21 words
The transceiver according to claim 8, further comprising: a second antenna for receiving signals in said another of said receive bands.
Claim 11
Dependent Claim
33 words
The transceiver according to claim 9, further comprising: means for selecting one of said first or said second antenna depending upon which one of said terrestrial mode and said satellite mode is used.
Claim 12
Dependent Claim
31 words
The transceiver according to claim 1, further comprising: one dual resonance antenna for sending signals in any of said transmit bands and for receiving signals in any of said receive bands.
Claim 13
Dependent Claim
109 words
The transceiver according to claim 1, further comprising: oscillator means for supplying a fixed fourth frequency for demodulation; first conversion means on two paths in phase quadrature, controlled by said fourth frequency, for carrying out direct conversion demodulation of output signals; second conversion means, controlled by said third frequency, for mixing said third frequency with signals received in said another one of said receive bands to supply intermediate frequency signals for demodulation; and third conversion means, controlled by said second frequency, for mixing said second frequency with signals received in said one of said receive bands to supply intermediate frequency signals to be applied to said first conversion means.
Claim 14
Dependent Claim
56 words
The transceiver according to claim 1, wherein: said terrestrial transmit frequency band is between 1710 MHz and 1785 MHz; said terrestrial receive frequency band is between 1805 MHz and 1880 MHz; said satellite transmit frequency band is between 1610 MHz and 1625.5 MHz; and said satellite receive frequency band is between 2483.5 MHz and 2500 MHz.
Claim 15
Dependent Claim
13 words
The transceiver according to claim 13, wherein: said divider means divides by three.
Claim 16
Dependent Claim
196 words
A dual mode portable digital signal transceiver providing communication in a terrestrial mode and a satellite mode, said transceiver providing communication in said terrestrial mode via a terrestrial network using a terrestrial transmit frequency band and a terrestrial receive frequency band, said transceiver providing communication in said satellite mode via a satellite network using a satellite transmit frequency band and a satellite receive frequency band, said terrestrial receive frequency band and said satellite receive frequency band being substantially adjoining, and defining receive bands of said transceiver, and said terrestrial transmit frequency band and said satellite transmit frequency band being far apart, and defining transmit bands of said transceiver, said transceiver comprising: synthesizer means for synthesizing a first frequency for demodulation and a second frequency for modulation; and divider means for dividing said second frequency to supply a third frequency for modulation; wherein signals received in any of said receive bands of said transceiver are demodulated using said first frequency, wherein signals transmitted in one of said transmit bands of said transceiver are modulated using said second frequency, and wherein signals transmitted in another of said transmit bands of said transceiver are modulated using said third frequency.
Claim 17
Dependent Claim
196 words
A dual mode portable digital signal transceiver providing communication in a terrestrial mode and a satellite mode, said transceiver providing communication in said terrestrial mode via a terrestrial network using a terrestrial transmit frequency band and a terrestrial receive frequency band, said transceiver providing communication in said satellite mode via a satellite network using a satellite transmit frequency band and a satellite receive frequency band, said terrestrial receive frequency band and said satellite receive frequency band being substantially adjoining, and defining receive bands of said transceiver, and said terrestrial transmit frequency band and said satellite transmit frequency band being far apart, and defining transmit bands of said transceiver, said transceiver comprising: synthesizer means for synthesizing a first frequency for demodulation and a second frequency for modulation; and divider means for dividing said second frequency to supply a third frequency for modulation; wherein signals received in any of said receive bands of said transceiver are demodulated using said first frequency, wherein signals transmitted in one of said transmit bands of said transceiver are modulated using said second frequency, and wherein signals transmitted in another of said transmit bands of said transceiver are modulated using said third frequency.
Claim 18
Dependent Claim
98 words
The transceiver according to claim 15, further comprising: conversion means on two paths in phase quadrature, controlled by said first frequency, for carrying out direct conversion demodulation of signals received in said receive bands; first modulation means on two paths in phase quadrature, controlled by said second frequency, for carrying out direct conversion modulation of signals transmitted in said one of said transmit bands, and second modulation means, controlled by said third frequency, for mixing said third frequency with intermediate frequency signals supplied by said first modulation means for transmission in said another one of said transmit bands.
Claim 19
Dependent Claim
72 words
The transceiver according to claim 15, wherein: said divider means divides by N, where N is a integer substantially equal to ±f r1 /(f r2 -f r1 ), and where either (1) f r1 corresponds to said terrestrial transmit frequency band and f r2 corresponds to said satellite transmit frequency band, or (2) f r1 corresponds to said satellite transmit frequency band and f r2 corresponds to said terrestrial transmit frequency band.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-10-08 | 2000-04-08 | 2000-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-08 | 2004-04-08 | 2004-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-08 | 2008-04-08 | 2008-10-08 | $7700.00 | Window Closed / Lapsed |