Patent ID: 7769390

Claim:
A multiuser Multiple-Input Multiple-Output (MIMO) system for transmitting and receiving data, the system comprising: a plurality of user equipments, wherein each of the plurality of user equipments calculates a set of channel capacity information using a linear reception scheme and a set of channel capacity information using a nonlinear reception scheme, and the sets of channel capacity information are fed back from the plurality of user equipments; and a base station for receiving the sets of channel capacity information fed back from the plurality of user equipments, separately calculating system capacities using at least two different antenna scheduling schemes based on the sets of channel capacity information, wherein at least one antenna scheduling scheme is based on channel capacity information calculated using the linear reception scheme and at least one other antenna scheduling scheme is based on channel capacity information calculated using the nonlinear reception scheme, selecting an antenna scheduling scheme, from the at least two antenna scheduling schemes, having a higher system capacity, and allocating transmission antennas to the plurality of user equipments using the selected antenna scheduling scheme; wherein the base station calculates a first system capacity using a Max Link Technique (MLT) scheme when the MLT scheme is used as one of the at least two antenna scheduling schemes, calculates a second system capacity using an Independent Stream Technique (IST) scheme when the IST scheme is used as one of the at least two antenna scheduling schemes, and selects the antenna scheduling scheme corresponding to a larger system capacity value, and wherein the first system capacity is calculated by C M ⁡ ( t ) = max k ⁢ ∑ m ⁢ ⁢ c f ⁡ ( γ k , m ⁡ ( t ) ) , ⁢ and the second system capacity is calculated by C I ⁡ ( t ) = ∑ m ⁢ ⁢ max k ⁢ c f ⁡ ( γ k , m ⁡ ( t ) ) , where C M (t) denotes the first system capacity, C I (t) denotes the second system capacity, c f (γ k,m (t)) denotes a system capacity calculated using a signal-to-noise ratio (SNR) of a channel established from an m-th transmission antenna to a k-th user equipment.