US5581554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple access telecommunication network
Assignee: US Philips Corp
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Filing: 1994-12-20
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Granted: 1996-12-03
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Expires: 2014-12-20
Abstract
Abstract In a multiple access network, signals transmitted by a plurality of secondary stations to a primary station are to be distinguished by the primary station. One method for realizing this is by the use of Sub-Carrier Multiple Access (SCMA). According to the method of SCMA, a transmit signal is modulated on a subcarrier having its own frequency and then amplitude modulated on a main carrier in each secondary station. To reduce a mutual disturbance by the secondary stations in SCMA, according to the present invention, a transmit signal is converted into high-speed bursts of a transmit signal. As a result, fewer secondary stations on average are active, so that the mutual disturbance by the secondary stations will diminish.
Inventors
- 👤 Carel J. L. Van Driel
- 👤 Atul N. Sinha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:16
CPC Classifications
H; H04; H04J; H04J14/00; H04J14/02; H04J14/0298
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
162 words
A telecommunication network comprising: a primary station; and a plurality of secondary stations coupled to said primary station via a common channel, said secondary stations each having a modulator, wherein the modulator comprises burst generator means for converting an input signal into a digital transmit signal containing data bursts, the digital transmit signal further having an average transmission rate corresponding to a repetition rate of the data bursts with time; and auxiliary modulator means for generating and supplying to the channel a carrier modulated with an auxiliary signal, the auxiliary signal comprising the digital transmit signal modulated on a subcarrier, the frequency of the subcarrier being different for different secondary stations, further wherein an instantaneous transmission rate of the digital transmit signal during the data bursts is higher than the average transmission rate of the digital transmit signal, and wherein said primary station comprises a demodulator for deriving at least a reconstituted digital transmit signal from a signal received from the channel.
Claim 2
Dependent Claim
162 words
A telecommunication network comprising: a primary station; and a plurality of secondary stations coupled to said primary station via a common channel, said secondary stations each having a modulator, wherein the modulator comprises burst generator means for converting an input signal into a digital transmit signal containing data bursts, the digital transmit signal further having an average transmission rate corresponding to a repetition rate of the data bursts with time; and auxiliary modulator means for generating and supplying to the channel a carrier modulated with an auxiliary signal, the auxiliary signal comprising the digital transmit signal modulated on a subcarrier, the frequency of the subcarrier being different for different secondary stations, further wherein an instantaneous transmission rate of the digital transmit signal during the data bursts is higher than the average transmission rate of the digital transmit signal, and wherein said primary station comprises a demodulator for deriving at least a reconstituted digital transmit signal from a signal received from the channel.
Claim 3
Dependent Claim
48 words
The telecommunication network as claimed in claim 1, further wherein the average transmission rate of the digital transmit signal is different for a number of said secondary stations and wherein the instantaneous transmission rate for the number of said secondary stations is the same during the data bursts.
Claim 4
Dependent Claim
42 words
The telecommunication network as claimed in claim 2, still further wherein the data bursts from different secondary stations last equally long and wherein the repetition rate of the data bursts is proportional to an average transmission rate of a particular secondary station.
Claim 5
Dependent Claim
50 words
The telecommunication network as claimed in claim 2, still further wherein the data bursts from different secondary stations each have a similar repetition rate and wherein a time duration of the data bursts of a particular secondary station is proportional to an average transmission rate of the particular secondary station.
Claim 6
Dependent Claim
97 words
A telecommunication station having a modulator, said modulator comprising: burst generator means for converting an input signal into a digital transmit signal containing data bursts, the digital transmit signal further having an average transmission rate corresponding to a repetition rate of the data bursts with time; and auxiliary modulator means for generating a carrier modulated with an auxiliary signal, the auxiliary signal comprising the digital transmit signal modulated on a subcarrier, wherein an instantaneous transmission rate of the digital transmit signal during the data bursts is higher than the average transmission rate of the digital transmit signal.
Claim 7
Dependent Claim
97 words
A telecommunication station having a modulator, said modulator comprising: burst generator means for converting an input signal into a digital transmit signal containing data bursts, the digital transmit signal further having an average transmission rate corresponding to a repetition rate of the data bursts with time; and auxiliary modulator means for generating a carrier modulated with an auxiliary signal, the auxiliary signal comprising the digital transmit signal modulated on a subcarrier, wherein an instantaneous transmission rate of the digital transmit signal during the data bursts is higher than the average transmission rate of the digital transmit signal.
Claim 8
Dependent Claim
36 words
The telecommunication station as claimed in claim 5, wherein the data bursts have a fixed duration and wherein the repetition rate of the data bursts is proportional to an average transmission rate of said telecommunication station.
Claim 9
Dependent Claim
37 words
The telecommunication station as claimed in claim 5, wherein the data bursts have a fixed repetition rate and further wherein a duration of the data bursts is proportional to an average transmission rate of said telecommunication station.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-03 | 2000-06-03 | 2000-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-03 | 2004-06-03 | 2004-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-03 | 2008-06-03 | 2008-12-03 | $7700.00 | Window Closed / Lapsed |