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CDMA communications method and system

  • US 5,586,113 A
  • Filed: 11/07/1994
  • Issued: 12/17/1996
  • Est. Priority Date: 11/08/1993
  • Status: Expired due to Term
First Claim
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1. A CDMA (Code Division Multiple Access) communications method for transmitting transmission data through one or more channels between base stations and mobile stations, said method comprising the steps of:

  • generating a frame including at least a part of said transmission data and a vacant portion when a transmission rate of said transmission data is lower than a predetermined rate, said vacant portion having no data to be transmitted;

    performing a primary modulation of said frame to produce a primary modulation signal;

    performing a secondary modulation of said primary modulation signal using a spreading code, to produce a secondary modulated wideband signal, said spreading code being different for each of said channels;

    transmitting said wideband signal using a carrier,wherein said step of generating a frame comprises the step of time-compressing said transmission data by a factor of N at every time period T where N is an integer greater than one, and T is the length of a frame at said predetermined transmission rate when the transmission rate of said transmission data is 1/N of said predetermined transmission rate, thereby providing said frame with said vacant portion.

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