US3879580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data terminal for use with TDMA processing repeater
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 data terminals for use in a TDMA communication system which provides the individual data terminals with synchronization error measurements and other commands. Each individual data terminal is capable of transmitting a narrowband coarse synchronization signal in response to a system command, thereby permitting rapid initial synchronization to be achieved. The disclosed data terminals transmit data in burst fashion at one uplink bandwidth, and receive downlink data at a second, narrower bandwidth.
Inventors
- 👤 Leslie H Schlosser
- 👤 Frank J Moreno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:15
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/204; H04B7/212; H04B7/2125
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
182 words
In a data terminal adapted for use in a time division multiple access communication system, the combination comprising: means for converting incoming user signals into respective digital words; means for multiplexing each of said digital words into respective time slot data at respective pre-assigned time slot times; means for transmitting said respective time slot data as a burst of data having a preamble comprising a data-free guard time interval, fixed digital data for permitting a processing repeater to acquire bit and word synchronization with said data burst, and variable digital call request data for use by said processing repeater, as an uplink burst transmission at a first given data rate during said pre-assigned time slot times; means for receiving, demodulating and maintaining synchronization with an essentially continuous downlink transmission free from said guard time intervals at a second data rate slower than said given data rate; means for identifying pre-assigned channels within said downlink transmission; means for demultiplexing data in each of said pre-assigned channels into a respective digital word; and means for converting said digital word into an outgoing user signal.
Claim 2
Dependent Claim
182 words
In a data terminal adapted for use in a time division multiple access communication system, the combination comprising: means for converting incoming user signals into respective digital words; means for multiplexing each of said digital words into respective time slot data at respective pre-assigned time slot times; means for transmitting said respective time slot data as a burst of data having a preamble comprising a data-free guard time interval, fixed digital data for permitting a processing repeater to acquire bit and word synchronization with said data burst, and variable digital call request data for use by said processing repeater, as an uplink burst transmission at a first given data rate during said pre-assigned time slot times; means for receiving, demodulating and maintaining synchronization with an essentially continuous downlink transmission free from said guard time intervals at a second data rate slower than said given data rate; means for identifying pre-assigned channels within said downlink transmission; means for demultiplexing data in each of said pre-assigned channels into a respective digital word; and means for converting said digital word into an outgoing user signal.
Claim 3
Dependent Claim
182 words
In a data terminal adapted for use in a time division multiple access communication system, the combination comprising: means for converting incoming user signals into respective digital words; means for multiplexing each of said digital words into respective time slot data at respective pre-assigned time slot times; means for transmitting said respective time slot data as a burst of data having a preamble comprising a data-free guard time interval, fixed digital data for permitting a processing repeater to acquire bit and word synchronization with said data burst, and variable digital call request data for use by said processing repeater, as an uplink burst transmission at a first given data rate during said pre-assigned time slot times; means for receiving, demodulating and maintaining synchronization with an essentially continuous downlink transmission free from said guard time intervals at a second data rate slower than said given data rate; means for identifying pre-assigned channels within said downlink transmission; means for demultiplexing data in each of said pre-assigned channels into a respective digital word; and means for converting said digital word into an outgoing user signal.
Claim 4
Dependent Claim
182 words
In a data terminal adapted for use in a time division multiple access communication system, the combination comprising: means for converting incoming user signals into respective digital words; means for multiplexing each of said digital words into respective time slot data at respective pre-assigned time slot times; means for transmitting said respective time slot data as a burst of data having a preamble comprising a data-free guard time interval, fixed digital data for permitting a processing repeater to acquire bit and word synchronization with said data burst, and variable digital call request data for use by said processing repeater, as an uplink burst transmission at a first given data rate during said pre-assigned time slot times; means for receiving, demodulating and maintaining synchronization with an essentially continuous downlink transmission free from said guard time intervals at a second data rate slower than said given data rate; means for identifying pre-assigned channels within said downlink transmission; means for demultiplexing data in each of said pre-assigned channels into a respective digital word; and means for converting said digital word into an outgoing user signal.
References Cited (Backward Citations)
US3534264A
Cited
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 |