Wireless communication apparatus and method, base station, user equipment and communication system

Provided is a wireless communication apparatus for a non-orthogonal multiple access communication system. The apparatus comprises: a power adjustment unit which is used to, for at least some of part equipment included in the communication system, dynamically adjust the sending power of each of the at least part of the user equipment for each sub-carrier according to channel state information about the communication system, so that the at least part of the user equipment performs uplink data transmission on corresponding sub-carriers with the adjusted sending power. According to the disclosed apparatus, method and system, at least one of the following technical benefits could be obtained: increasing the channel capacity of the communication system; reducing the bit error rate during the communication; and reducing the interference between corresponding user equipment in the communication system.