Patent ID: 8355340

Claim:
A method for obtaining Channel Quality Indicator (CQI) information, comprising: receiving, by a base station, quantized channel information, quantization error, Inter-Cell Interference (ICI) power and noise power fed back by each User Equipment (UE) after channel estimation; and estimating, by the base station, a CQI corresponding to each UE to obtain an estimated CQI value corresponding to the UE according to the quantized channel information, the quantization error, the ICI power and the noise power which are fed back by the UE as well as an instantaneous precoding vector of each UE; wherein the quantized channel information is a quantized channel vector or a quantized channel matrix; the base station estimates the CQI corresponding to the UE according to an equation of: CQI k =  h ^ k · w k  2 ICI + σ 2 +  h ^ k  2 ⁢ ∑ i ≠ k K ⁢  w i  2 ⁢ sin 2 ⁢ θ k wherein CQI k denotes an estimated CQI value corresponding to a k th UE; ĥ k denotes a quantized channel vector of the k th UE; w k denotes a precoding vector or a precoding matrix of the k th UE; ICI denotes inter-cell interference power fed back by the k th UE; σ 2 denotes noise power fed back by the k th UE; θ k denotes a channel quantization error angle fed back by the k th UE; and K denotes the total number of UEs.