Data terminal for use with TDMA processing repeater
First Claim
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1. 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.
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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.
27 Citations
1 Claim
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1. 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.
- means for converting incoming user signals into respective digital words;
Specification
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Current AssigneeFrank J. Moreno, Leslie H. Schlosser
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Original AssigneeFrank J. Moreno, Leslie H. Schlosser
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InventorsSchlosser, Leslie H., Moreno, Frank J.
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Primary Examiner(s)Blakeslee, Ralph D.
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Application NumberUS05/309,325Time in Patent Office879 DaysField of Search325/4 179/15BV,15BA,15BS,15BWUS Class Current370/324CPC Class CodesH04B 7/2125 Synchronisation
