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System and method for multiple access short message communications

  • US 5,862,132 A
  • Filed: 04/22/1996
  • Issued: 01/19/1999
  • Est. Priority Date: 04/22/1996
  • Status: Expired due to Term
First Claim
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1. A communications system utilizing time division multiple access (TDMA) and code division multiple access (CDMA) techniques for efficiently transmitting bursts of data from a plurality of users at different data rates to one or more receivers within the system, comprising:

  • a timing reference for generating a precise timing signal and a corresponding precise time reference;

    a plurality of transmitters, coupled to the timing reference for providing synchronization between the plurality of transmitters, for transmitting the bursts of data at precise times and time intervals and at a predetermined frequency within a TDMA superframe wherein synchronization between said plurality of transmitters and the one or more receivers is not needed; and

    wherein the bursts of data is modulated with a carrier and is multiplied with a spreading sequence thereby permitting more than one of the plurality of transmitters to transmit at a same time and at the predetermined frequency.

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