Method and apparatus for downlink beam forming in TD-CDMA system
First Claim
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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Abstract
The present invention discloses a method and an apparatus for downlink beam forming in a TD-CDMA system. The method includes: acquiring the spatial covariance matrixes of all uplink slot interference user signals and the downlink slots in which the interference user signals locate; obtaining the interference spatial covariance matrixes 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; determining the beam forming weight coefficient of downlink expected user signals based on the interference spatial covariance matrixes of each downlink slot and the spatial covariance matrixes of the downlink expected user signals; implementing beam forming based on the beam forming weight coefficient of downlink expected user signals.
9 Citations
6 Claims
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1. A downlink beam forming method in a Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system, comprising:
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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, - View Dependent Claims (2, 3)
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4. A downlink beam forming apparatus in a Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system, comprising:
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an interference user information acquiring module, for acquiring spatial covariance matrixes of all uplink slot interference user signals by the following formula to obtain M spatial covariance matrixes and determining the 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); a spatial covariance matrix acquiring module, for obtaining interference spatial covariance matrixes of the downlink slots based on the downlink slots in which the uplink interference user signals locate, and acquiring spatial covariance matrixes of downlink expected user signals by the following formula to calculate the interference spatial covariance matrix of each downlink slot, - View Dependent Claims (5, 6)
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Specification