Patent ID: 7463601

Claim:
A method of transmitting feedback information for data scheduling in a user terminal accessing a base station (BS) that services a plurality of user terminals each using a plurality of receive antennas via a plurality of transmit antennas, comprising the steps of: estimating channel characteristics from the transmit antennas to the user terminal; decomposing the estimated channel characteristics into receive channel characteristics and transmit channel characteristics; calculating a principal eigen vector representing a largest value of the transmit channel characteristics; and feeding back the transmit principal eigen vector to the BS; wherein the channel characteristics are decomposed by H k = U k ⁢ Λ k ⁢ V k H = [ μ k , 1 , μ k , 2 , … ⁢ , μ k , M ] ⁡ [ λ k , 1 , λ k , 2 , … ⁢ , λ k , M ] ⁡ [ v k , 1 , v k , 2 , … ⁢ , v k , M ] H where H k is a channel matrix representing channel characteristics for a kth user, U k is a matrix representing receive channel characteristics for the kth user, μ k,i is a vector representing the receive channel characteristic of an ith sub-channel, Λ k is a diagonal matrix representing channel gains for the kth user, λ k,i is a constant representing the channel gain of the ith sub-channel, V k is a matrix representing transmit channel characteristics for the kth user, and v k,i is a vector representing the transmit channel characteristic of the ith sub-channel.