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Method and system for code reuse and capacity enhancement using null steering

  • US 8,553,746 B2
  • Filed: 04/03/2012
  • Issued: 10/08/2013
  • Est. Priority Date: 11/02/2001
  • Status: Active Grant
First Claim
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1. A base station employing null beam steering of wireless communication signals to a plurality of users, comprising:

  • an antenna array having a plurality of antennas;

    a spreading code generator for selecting spreading codes for the plurality of users that correlate to spreading codes already being used with the same cell;

    a plurality of weight modulators for modulating data di, for i=1, . . . , N, intended for one of N users with N+1 complex weights wi, for i=1, . . . , N+1, each modulated signal being directed to one of the N+1 antennas;

    wherein the complex weights are selected to create a null at one of the plurality of users, such that a gain of a composite channel from the base station to the nulled user is zero and a gain of a composite channel from the base station to another user is maximized;

    wherein each element of the complex weights is a function of the channel impulse responses from the antenna array to locations of the users; and

    a summer for summing the weight modulated data signals.

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