Method and transmitter for non-orthogonal multiple access communication system

A transmitting method of a transmitter for a non-orthogonal multiple access communication system, including: storing rules for calculating transmission rate combinations for simultaneously transmitting a first and a second application data; receiving a transmission grant for transmitting the first application data from a receiver; determining whether to transmit the second application data simultaneously; if yes, calculating multiple transmission rate combinations for simultaneously transmitting the first and the second application data based on the rules to calculate a transmission rate combination table, or generating the transmission rate combination table according to a pre-stored transmission rate combination table; selecting a transmission rate combination from the transmission rate combinations in the transmission rate combination table based on a transmission rate requirement of the second application data; and transmitting the first and the second application data simultaneously based on the selected transmission rate combination.