Receiver, transmitter and radio communication method

Abstract

Provided are a receiver, a transmitter and a radio communication method capable of using non-orthogonal multiple access while suppressing cost increase and processing delay. A mobile station [ 200 A] includes a physical channel segmentation unit [ 210 ] and data modulating/decoding units [ 220 ]. A radio resource block allocated to non-orthogonal signals is defined in a frequency domain, a time domain and a non-orthogonal multiplex domain. The non-orthogonal multiplex domain has multiple levels corresponding to the number of interference cancellations by the data demodulating/decoding units [ 220 ]. Interference canceller of the mobile station [ 200 A] cancels a non-orthogonal signal whose allocated radio resource block is at a lower level than that of the mobile station [ 200 A].

1 . (canceled) 
     
     
         2 : A receiver comprising:
 a radio signal reception unit configured to receive radio signals including a plurality of non-orthogonal signals which are not orthogonal to each other;   an interference cancellation unit configured to extract the non-orthogonal signal addressed to the receiver from the plurality of non-orthogonal signals received by the radio signal reception unit, by demodulating and cancelling the radio signal addressed to another receiver; and   a demodulation unit configured to demodulate the signal extracted by the interference cancellation unit and addressed to the receiver, wherein   a radio resource block allocated to the non-orthogonal signals is defined in a frequency domain, a time domain and a non-orthogonal multiplex domain,   the non-orthogonal multiplex domain has a plurality of levels, and   the interference cancellation unit cancels the non-orthogonal signal whose allocated radio resource block is at a lower level than that of the receiver within a radio resource block in the frequency domain or the time domain to which the receiver itself is assigned.   
     
     
         3 : A receiver comprising:
 a radio signal reception unit configured to receive radio signals including a plurality of non-orthogonal signals which are not orthogonal to each other;   an interference cancellation unit configured to extract the non-orthogonal signal addressed to the receiver from the plurality of non-orthogonal signals received by the radio signal reception unit, by demodulating and cancelling the radio signal addressed to another receiver; and   a demodulation unit configured to demodulate the signal extracted by the interference cancellation unit and addressed to the receiver, wherein   a radio resource block allocated to the non-orthogonal signals is defined in a frequency domain, a time domain and a non-orthogonal multiplex domain,   the non-orthogonal multiplex domain has a plurality of levels, and   the interference cancellation unit applies a joint coding to a high level, the joint coding being a method of coding in the radio resource blocks collectively.   
     
     
         4 : The receiver according to  claim 3 , the interference cancellation unit applies a separate coding to a low level, the separate coding being a method of coding in the radio resource blocks independently. 
     
     
         5 : A transmitter comprising:
 a radio signal transmission unit configured to transmit radio signals to a plurality of receivers located within a cell, the radio signals including a plurality of non-orthogonal signals which are not orthogonal to each other; and   an allocation unit configured to allocate a radio resource block to the non-orthogonal signals, wherein   the allocation unit allocates, to the non-orthogonal signals, the radio resource block defined in a frequency domain, a time domain, and a non-orthogonal multiplex domain having a plurality of levels corresponding to the number of interference cancellations in the receivers, and   the allocation unit allows concurrent allocation of radio resource blocks in two or more frequency/time domains and does not allow allocation of two or more levels in the non-orthogonal multiplex domain when allocating multiple radio resource blocks to a single transmission destination.