Patent US3879581A successfully refreshed from Google Patents.
US3879581A
Expired / Lapsed
US
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Processing repeater for TDMA communication system
Assignee: Raytheon Co
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Filing: 1972-11-24
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Granted: 1975-04-22
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Expires: 1992-11-24
Abstract
Abstract The present invention relates to a processing repeater for use in a TDMA communication system which is capable of providing the individual data terminals with synchronization error measurements and other control data. In the particular embodiment disclosed, the processing repeater is also capable of receiving a narrowband coarse synchronization signal from an inactive data terminal in response to an interrogation command, thereby permitting rapid initial synchronization to be achieved. The disclosed processing repeater is also capable of controlling the demand assignment process for the allocation; of time slots in response to either narrowband or wideband call requests from inactive or active data terminals respectively.
Inventors
- 👤 Leslie H Schlosser
- 👤 James B Reeves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:09
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/204; H04B7/212; H04B7/2125
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
200 words
In a time division multiple access communication system having a plurality of data terminals, each terminal capable of transmitting an uplink burst of data within an assigned time slot, and all capable of receiving an essentially continuous stream of downlink data, a processing repeater for receiving a burst transmission from one of said data terminals and for transmitting it within a frame of said stream of data to another of said terminals, said processing repeater comprising: means for generating a common timing standard; means for receiving and demodulating uplink transmission bursts within assigned time slots; means for detecting a predetermined unique word within each of said bursts; means for measuring the synchronization error of the detected unique word within an uplink transmission burst from a particular one of said plurality of data terminals with respect to said common timing standard; and means for encoding the measured synchronization error as digital data within a synchronization and control field provided as part of said stream of data, whereby said particular data terminal is provided an indication of the timing correction required to maintain synchronization between the data bursts transmitted by said terminal and said common timing standard generated by said processing repeater.
Claim 2
Dependent Claim
200 words
In a time division multiple access communication system having a plurality of data terminals, each terminal capable of transmitting an uplink burst of data within an assigned time slot, and all capable of receiving an essentially continuous stream of downlink data, a processing repeater for receiving a burst transmission from one of said data terminals and for transmitting it within a frame of said stream of data to another of said terminals, said processing repeater comprising: means for generating a common timing standard; means for receiving and demodulating uplink transmission bursts within assigned time slots; means for detecting a predetermined unique word within each of said bursts; means for measuring the synchronization error of the detected unique word within an uplink transmission burst from a particular one of said plurality of data terminals with respect to said common timing standard; and means for encoding the measured synchronization error as digital data within a synchronization and control field provided as part of said stream of data, whereby said particular data terminal is provided an indication of the timing correction required to maintain synchronization between the data bursts transmitted by said terminal and said common timing standard generated by said processing repeater.
Claim 3
Dependent Claim
200 words
In a time division multiple access communication system having a plurality of data terminals, each terminal capable of transmitting an uplink burst of data within an assigned time slot, and all capable of receiving an essentially continuous stream of downlink data, a processing repeater for receiving a burst transmission from one of said data terminals and for transmitting it within a frame of said stream of data to another of said terminals, said processing repeater comprising: means for generating a common timing standard; means for receiving and demodulating uplink transmission bursts within assigned time slots; means for detecting a predetermined unique word within each of said bursts; means for measuring the synchronization error of the detected unique word within an uplink transmission burst from a particular one of said plurality of data terminals with respect to said common timing standard; and means for encoding the measured synchronization error as digital data within a synchronization and control field provided as part of said stream of data, whereby said particular data terminal is provided an indication of the timing correction required to maintain synchronization between the data bursts transmitted by said terminal and said common timing standard generated by said processing repeater.
Claim 4
Dependent Claim
200 words
In a time division multiple access communication system having a plurality of data terminals, each terminal capable of transmitting an uplink burst of data within an assigned time slot, and all capable of receiving an essentially continuous stream of downlink data, a processing repeater for receiving a burst transmission from one of said data terminals and for transmitting it within a frame of said stream of data to another of said terminals, said processing repeater comprising: means for generating a common timing standard; means for receiving and demodulating uplink transmission bursts within assigned time slots; means for detecting a predetermined unique word within each of said bursts; means for measuring the synchronization error of the detected unique word within an uplink transmission burst from a particular one of said plurality of data terminals with respect to said common timing standard; and means for encoding the measured synchronization error as digital data within a synchronization and control field provided as part of said stream of data, whereby said particular data terminal is provided an indication of the timing correction required to maintain synchronization between the data bursts transmitted by said terminal and said common timing standard generated by said processing repeater.
Claim 5
Dependent Claim
50 words
The processing relay of claim 1 further comprising means for selecting which of successive ones of said data terminals is to have its uplink transmission burst synchronization error measured by said measuring means, whereby uplink transmission interference between said successive data terminals actively transmitting bursts of data may be avoided.
Claim 6
Dependent Claim
50 words
The processing relay of claim 2 further comprising: means for assigning a second time slot to a data terminal already transmitting data bursts in a first assigned time slot; and means for encoding a digital representation of the second assigned time slot as part of said stream of downlink data.
Claim 7
Dependent Claim
49 words
The processing relay of claim 2 further comprising: means for assigning an initial time slot to a data terminal not already transmitting data bursts in an assigned time slot; means for encoding a digital representation of the initial time slot assignment as part of said stream of downlink data.
Claim 8
Dependent Claim
101 words
In a communications satellite adapted for use in a time division multiple access communications system, the combination comprising: means for receiving and demodulating wideband uplink data bursts; means for establishing synchronization between various ones of said data bursts originating from different data terminals such that they are received by said satellite sequentially in a non-overlapping fashion separated by a guard time; means for buffering and encoding said data bursts as part of a downlink stream of free from any guard time intervals having a narrower bandwidth than that of said data bursts; and means for transmitting said downlink stream of data.
Claim 9
Dependent Claim
101 words
In a communications satellite adapted for use in a time division multiple access communications system, the combination comprising: means for receiving and demodulating wideband uplink data bursts; means for establishing synchronization between various ones of said data bursts originating from different data terminals such that they are received by said satellite sequentially in a non-overlapping fashion separated by a guard time; means for buffering and encoding said data bursts as part of a downlink stream of free from any guard time intervals having a narrower bandwidth than that of said data bursts; and means for transmitting said downlink stream of data.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |