Patent ID: 7876851

Claim:
An apparatus for controlling an amount of channel information to be fed back in a multiple antenna system in a multi-user environment, the apparatus comprising: a channel estimator which estimates channel values by using an input signal; a Singular Value Decomposition (SVD) operator which decomposes singular values from the estimated channel values; and a feedback determining unit which uses the singular values to compute channel capacity that can be obtained according to the amount of channel information to be fed back, and selects the channel information to be fed back by using the channel capacity, wherein the feedback determining unit compares a greatest of the singular values with an average of the singular values of a specific period of time to determine whether to perform feedback, and wherein the feedback determining unit uses the singular values to compute the channel capacity that can be obtained according to the amount of channel information to be fed back, and selects the channel information to be fed back by using the channel capacity when feedback is determined to be performed.