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Method and apparatus for downlink beam forming in TD-CDMA system

  • US 8,811,904 B2
  • Filed: 01/09/2007
  • Issued: 08/19/2014
  • Est. Priority Date: 01/18/2006
  • Status: Active Grant
First Claim
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1. A downlink beam forming method in a Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system, comprising:

  • acquiring spatial covariance matrixes of all uplink slot interference user signals by the following formula to obtain M spatial covariance matrixes and determining downlink slots in which the interference user signals locate, RI(m)=E{HI(m)HI(m)H}, m=1, . . . , M, where E{HI(m)HI(m)H} represents an operation to solve a mathematical expectation of a random variable, M is the number of the interference user signals, HI(m) represents multiple antenna channel estimation of the mth interference user, and HI(m)H represents a conjugate transpose operation of matrix HI(m);

    obtaining an interference spatial covariance matrix of each downlink slot based on the downlink slots in which the interference user signals locate and the spatial covariance matrixes of the interference user signals by the following formula to calculate the interference spatial covariance matrix of each downlink slot,

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