Transmission concept using multi-user superposition coding

A receiver for receiving data signals from a plurality of transmitters using multi-user superposition coding, the receiver configured to

• estimate a phase shift between channels via which the receiver receives the data signals to acquire a phase shift information between the channels;
• send a phase shift compensation signal to at least one of the plurality of transmitters, the phase shift compensation signal depending on the phase shift information;
• and
• demap the data signals by performing demappinq on a superposition of the data signals to acquire information data per data signal,
• wherein the receiver is configured to receive the data signals via spectrally collocated subcarriers of orthogonal frequency division multiplex (OFDM) signals from the plurality of transmitters, wherein physical resource blocks of first OFDM signals from a first transmitter, in units of which subcarrier allocation is performed, are spectrally subdivided into sub-bands corresponding to physical resource blocks of second OFDM signals sent from a second transmitter,
• wherein the receiver is configured to receive the first and second data signals using multi-user superposition, wherein the receiver is configured to send the phase shift compensation signal to the first transmitter so that the phase shift compensation signal comprises a phase shift value per spectral subband of the spectral subbands into which physical resource blocks of a spectrum of subcarriers of the first OFDM signals are spectrally subdivided.

A receiver for receiving data signals from a plurality of transmitters using multi-user superposition coding, the receiver configured to

• estimate a phase shift between channels via which the receiver receives the data signals to acquire a phase shift information between the channels;
• send a phase shift compensation signal to at least one of the plurality of transmitters, the phase shift compensation signal depending on the phase shift information;
• and
• demap the data signals by performing demappinq on a superposition of the data signals to acquire information data per data signal,
• wherein the receiver is configured to send to the first transmitter a blanking scheduling signal instructing the first transmitter as to when to blank orthogonal frequency division multiplex (OFDM) transmission in order not to interfere with at least a subset of second channel estimation reference signals sent by the second transmitter for channel estimation purposes, wherein the receiver is configured to perform channel estimation on the basis of second channel estimation reference signals sent by the second transmitter.

A receiver for receiving data signals from a plurality of transmitters using multi-user superposition coding, the receiver configured to

• estimate a phase shift between channels via which the receiver receives the data signals to acquire a phase shift information between the channels;
• send a phase shift compensation signal to at least one of the plurality of transmitters, the phase shift compensation signal depending on the phase shift information;
• and
• demap the data signals by performing demappinq on a superposition of the data signals to acquire information data per data signal,
• wherein the receiver is a base station of, and the plurality of transmitters are mobile terminals of, an OFDM/SC-FDM (OFDM=orthogonal frequency division multiplex;
• SC-FDM=Single Carrier Frequency Division Multiplexing) or an OFDMA/SC-FDMA (OFDMA=Orthogonal Frequency-Division Multiple Access;
• SC-FDMA=Single Carrier Frequency Division Multiple Access wireless communication system, wherein the data signals are received on frequency-overlapping subcarriers of temporally overlapping OFDM symbols provided by the plurality of transmitters in uplink direction.

A transmitter for transmitting a data signal with superposition with a further data signal of a further transmitter at a receiver seeking to receive at least the further data signal using multi-user superposition coding, the transmitter configured to

• send a phase shift estimation reference signal to the receiver;
• receive a phase shift compensation signal responsive to the phase shift estimation reference signal;
• and
• map data using a constellation in a manner phase shift compensated according to the phase shift compensation signal to acquire the data signal.

A receiver for receiving a wanted data signal from a served transmitter, the receiver configured to

• estimate a phase shift between channels via which the receiver receives the wanted data signal and an interfering data signal sent from a transmitter served by a further receiver in a manner superpositioned with the wanted data signal to acquire a phase shift information between the channels;
• send a phase shift compensation signal to the further receiver so as to be forwarded to the further transmitter, the phase shift compensation signal depending on the phase shift information;
• and
• demap the wanted data signal by performing demapping on a superposition of the wanted and interfering data signals using multi-user superposition decoding to acquire an information data for the wanted data signal.