Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmitter device may obtain a first channel matrix associated with communications between a transmitter device transmission antenna and a transmitter device reception antenna and a second channel matrix associated with communications between the transmitter device transmission antenna and a receiver device reception antenna associated with a receiver device. The transmitter device may generate a combined channel matrix based at least in part on the first channel matrix and the second channel matrix. The transmitter device may reduce interference between the transmitter device transmission antenna and the transmitter device reception antenna based at least in part on multiplying the combined channel matrix by a precoding matrix. Numerous other aspects are described.