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

  • US 20030108084A1
  • Filed: 10/31/2002
  • Published: 06/12/2003
  • Est. Priority Date: 11/02/2001
  • Status: Active Grant
First Claim
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1. A null beam technique wherein only one of at least two remote users, all of whom employ a same or a correlated spreading code within a given cell or sector, is enabled to receive a communication from a base station transmitting to the at least two remote users, said base station transmitting to said remote users over an antenna array having a plurality of antennas, comprising:

  • a) said base station modulating data di, for i=1, . . . , N, intended for one of N (N>

    1) remote users with N+1 complex weights wi (for i=1, . . . , N, each is a N+1 complex vector), each modulated signal being directed to one of said N+1 antennas;

    wherein each element of the vectors w1 and w2 is a function of the channel impulse responses from the antenna array to locations of the remote users;

    b) summing the modulated data signals d1, d2, . . . dN and c) transmitting the summed signals.

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