Communication devices and methods with hybrid beamforming

A communication device for Radio Frequency (RF)-based communication with another communication device using single carrier transmission, said communication device comprising:

• analog beamforming circuitry configured to perform analog beamforming training with the other communication device for determining analog beams for use in receiving said RF data streams,
• digital beamforming computation circuitry configured to perform digital beamforming based on digital beamforming information, and
• antenna circuitry configured to transmit or receive a decision indicator indicating if computation of the digital beamforming information is to be made by the communication device or the other communication device and to use the computed digital beamforming information for performing the digital beamforming, wherein the digital beamforming information is computed and used as time domain information.

A communication method for Radio Frequency (RF)-based communication between communication devices using single carrier transmission, said communication method comprising:

• performing analog beamforming training between the communication devices for determining analog beams for use in receiving said RF data streams,
• computing digital beamforming information corresponding to one or more combinations of analog beams used in said analog beamforming training, and
• transmitting the computed digital beamforming information from a first communication device of the communication devices computing the digital beamforming information to a second communication device of the communication devices to perform digital beamforming based on the digital beamforming information, wherein the digital beamforming information is computed and used as time domain information.

A communication device for Radio Frequency (RF)-based communication with another communication device using single carrier transmission, said communication device comprising:

• digital beamforming circuitry configured to perform digital beamforming based on digital beamforming information to obtain RF data streams, and
• analog beamforming circuitry configured to perform analog beamforming for the obtained RF data stream, and
• antenna circuitry configured to transmit a digital beamforming indicator indicating that digital beamforming can be performed by the communication device and/or a digital beamforming indicator indicating that digital beamforming should be performed during and/or after analog beamforming training in addition to analog beamforming and/or to receive a digital beamforming indicator indicating that digital beamforming can be performed by the other communication device and/or a digital beamforming indicator indicating that digital beamforming should be performed during analog beamforming training in addition to analog beamforming, wherein the digital beamforming information is computed and used as time domain information.