Communication device and method

A communication method for communicating with a communication device over a link that is utilized at the substantially same time and with the substantially same frequency resource by a pair of further communication devices, the method comprising:

• applying beamformers by a control unit to one or more antenna arrays to perform beamforming,
• determining whether at least one of the beamformers satisfies an interference condition such that a level of interference leaked to the further communication devices by the first communication device is below a defined threshold,
• and if available selecting the at least one beamformer for communicating with the second communication device,
• wherein the interference condition is based on channel characteristics between the first communication device and at least one of the further communication devices and non-reciprocity mismatch.

A communication system comprising a first and a second communication device and a pair of further communication devices, the first communication device is configured to communicate with the second communication device over a link that is utilized at the substantially same time and with the substantially same frequency resource by a pair of further communication devices,

• wherein the first communication device comprises:
• one or more antenna arrays with which beamforming can be performed;
• and
• an control circuitry configured to apply beamformers to control beamforming by the one or more antenna arrays;
• and
• an interference alignment circuitry configured to determine whether at least one of the beamformers satisfies an interference condition such that a level of interference leaked to the further communication devices by the first communication device is below a defined threshold, and if available, select the at least one beamformer for communicating with the second communication device, the interference condition being based on channel characteristics between the first communication device and at least one of the further communication devices and non-reciprocity mismatch,
• wherein at least one of the pair of further communication devices comprises:
• one or more antenna arrays having different transmission and reception antenna patterns, and
• circuitry configured to
• evaluate a non-reciprocity mismatch between the transmission and reception antenna patterns, and
• transmit a value indicative of a level of non-reciprocity of the transmission and reception antenna patterns to a further communication device.