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Subtractive CDMA system with simultaneous subtraction in code space and direction-of-arrival space

  • US 5,831,977 A
  • Filed: 09/04/1996
  • Issued: 11/03/1998
  • Est. Priority Date: 09/04/1996
  • Status: Expired due to Term
First Claim
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1. A communications system comprising a plurality of mobile stations and an improved base station for receiving signals from said mobile stations and decoding information-bearing signals transmitted therefrom, comprising:

  • antenna means comprising antenna elements disposed around a support structure for receiving signals transmitted from said plurality of mobile stations and generating output signals from each antenna element;

    conversion means for amplifying, filtering and converting signals from each of said antenna elements into a corresponding number of converted signals for processing;

    storage means for temporarily storing a number of samples of said converted signals; and

    processing means for iteratively processing and reprocessing said stored samples successively to decode said information from each of said mobile stations in turn, wherein the processing provided by said processing means identifies from said stored samples an information symbol transmitted by one of said mobile stations thereby decoding said information-bearing signal and subtracts values dependent on said identified information symbol from said stored samples thereby reducing interference between the just-decoded signal and the signal to be decoded at a subsequent iteration.

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