Abstract
The invention provides a joint user grouping and power distribution method and a base station using the method, applicable to a collaborative non-orthogonal multiple access system. The method providedby the invention comprises the following steps of sorting user devices according to K channel gains between the base station and the K user devices, and building a strong user candidate group including K/2 user devices and a weak user candidate group including K/2 user devices; pairing each one in the strong user candidate group with the one in the weak user candidate group, and meanwhile computing power distribution coefficients corresponding to the two user devices in each paired combination to divide the K user devices into K/2 groups; and according to the power distribution coefficients corresponding to the K/2 groups, transmitting messages to the K user devices.