Specular component estimation in a wireless communication network

A multi-antenna device, comprising:

• an antenna array,
• wherein the antenna array comprises a plurality of antennas,
• wherein the antenna array is arranged to receive a multi-carrier signal,
• wherein the multi-carrier signal is received from a second multi-antenna device,
• wherein the multi-carrier signal is received over a radio channel,
• wherein the multi-carrier signal comprises at least two subcarriers,
• wherein each of the at least two subcarriers is mapped at the second multi-antenna device to a respective subcarrier-beamformer, and
• a processor circuit,
• wherein the processor circuit configured to identify at least one communication direction,
• wherein the at least one communication direction is for a radio signal communication,
• wherein the radio signal communication is between the multi-antenna device and the second multi-antenna device,
• wherein the at least communication direction is identified based on at least one specular path component of the radio channel,
• wherein the at least one specular path component is related to one of the subcarrier-beamformers,
• wherein the processor circuit is arranged to:
• detect a signal energy of the at least one specular path component of the radio channel on each of the subcarriers, and
• when the detected signal energy is greater than or equal to a first threshold on a first subcarrier among the subcarriers, identify as the at least one communication direction for the radio signal communication a direction into which the subcarrier-beamformer of the first subcarrier points its signal energy, and
• wherein the processor circuit is arranged to:
• signal to the second multi-antenna device the identified communication direction, wherein signaling the at least one communication direction to the second multi-antenna device allows the second multi-antenna device to calculate a radio signal beamformer according to the at least one communication direction, or
• calculate the radio signal beamformer according to the at least one communication direction.