A radio base station for a radio communications system that conducts radio communications over a radio interface using basic physical channels, where each basic physical channel defines a time slot and a radio frequency for transmission, the radio base station comprising: circuitry configured to establish radio communication between the radio base station and multiple user equipments, UEs, over same basic physical channel among the basic physical channels, where at least three subchannels are provided in the same basic physical channel that can simultaneously support three full rate UE baseband communications, the circuitry including: a first baseband transmitter chain configured such that it can map full rate data corresponding to first and second full rate UE baseband communications as adaptive quadrature phase shift keying, AQPSK, symbols onto a first and a second of the three subchannels, characterized in that the circuitry further includes: a second baseband transmitter chain configured such that it can map full rate data corresponding to a third full rate UE baseband communication as binary phase shift keying, BPSK, or as Gaussian minimum shift keying, GMSK, symbols onto a third of the three subchannels, wherein the first and second baseband transmitter chains are configured to apply a scaling factor based on a first angle, β, associated with a dual-channel subchannel power imbalance to the AQPSK symbols generated by the first baseband transmitter chain and to the BPSK or GMSK symbols generated by the second baseband transmitter chain, wherein the AQPSK symbols are scaled by cos(β) and the BPSK or GMSK symbols are scaled by sin(β), and wherein the second baseband transmitter chain comprises a first phase shifting circuitry configured to apply a first phase shift angle to the scaled BPSK or GMSK symbols, and a summer configured to sum the AQPSK symbols from the first baseband transmitter chain and the phase shifted symbols from the second baseband transmitter chain. circuitry configured to establish radio communication between the radio base station and multiple user equipments, UEs, over same basic physical channel among the basic physical channels, where at least three subchannels are provided in the same basic physical channel that can simultaneously support three full rate UE baseband communications, the circuitry including: a first baseband transmitter chain configured such that it can map full rate data corresponding to first and second full rate UE baseband communications as adaptive quadrature phase shift keying, AQPSK, symbols onto a first and a second of the three subchannels, characterized in that the circuitry further includes: a second baseband transmitter chain configured such that it can map full rate data corresponding to a third full rate UE baseband communication as binary phase shift keying, BPSK, or as Gaussian minimum shift keying, GMSK, symbols onto a third of the three subchannels, wherein the first and second baseband transmitter chains are configured to apply a scaling factor based on a first angle, β, associated with a dual-channel subchannel power imbalance to the AQPSK symbols generated by the first baseband transmitter chain and to the BPSK or GMSK symbols generated by the second baseband transmitter chain, wherein the AQPSK symbols are scaled by cos(β) and the BPSK or GMSK symbols are scaled by sin(β), and wherein the second baseband transmitter chain comprises a first phase shifting circuitry configured to apply a first phase shift angle to the scaled BPSK or GMSK symbols, and a second baseband transmitter chain configured such that it can map full rate data corresponding to a third full rate UE baseband communication as binary phase shift keying, BPSK, or as Gaussian minimum shift keying, GMSK, symbols onto a third of the three subchannels, wherein the first and second baseband transmitter chains are configured to apply a scaling factor based on a first angle, β, associated with a dual-channel subchannel power imbalance to the AQPSK symbols generated by the first baseband transmitter chain and to the BPSK or GMSK symbols generated by the second baseband transmitter chain, wherein the AQPSK symbols are scaled by cos(β) and the BPSK or GMSK symbols are scaled by sin(β), and wherein the second baseband transmitter chain comprises a first phase shifting circuitry configured to apply a first phase shift angle to the scaled BPSK or GMSK symbols, and a summer configured to sum the AQPSK symbols from the first baseband transmitter chain and the phase shifted symbols from the second baseband transmitter chain.