Transmitter, receiver, communication system and communication method for mimo communication enabling mitigation of an interfering transmitter

A communication system comprising:

• one or more transmitters being configured to:
• generate an embedded signal by embedding a transmit signal with a linear time-domain transformation onto a secret subspace based on a secret unitary matrix which is accessible to the transmitter and the receiver, and
• transmit the embedded signal via MIMO communication having a legitimate channel matrix to the receiver;
• and
• one or more receivers being configured to:
• receive a receive signal which includes an embedded signal transmitted by the one or more transmitters-via MIMO communication having a legitimate channel matrix to the receiver, the embedded signal being the result of embedding a transmit signal with a linear time-domain transformation onto a secret subspace based on a secret unitary matrix which is accessible to the one or more transmitters and the receiver, and
• process the receive signal for determining an estimate of the transmit signal, or a variable related to the transmit signal, by extracting the transmit signal from the secret subspace using the secret unitary matrix.

A communication method for MIMO communication of one or more transmitters with a receiver the method comprising the steps of:

• at the one or more transmitters
• generating an embedded signal by embedding a transmit signal onto a secret subspace based on a secret unitary matrix which is accessible to the one or more transmitters and the receiver, and
• transmitting the embedded signalvia MIMO communication having a legitimate channel matrix to the receiver, and at the receiver
• receiving a receive signal which includes the embedded signal,
• processing the receive signal for determining an estimate of the transmit signal, or a variable related to the transmit signal, by extracting the transmit signal from the secret subspace using the secret unitary matrix.