Communication devices for shaping symbol constellations

A second communication device for a communication system, the second communication device being configured to:

• receive a set of reference signals from a first communication device, wherein the set of reference signals is associated with a set of radiating patterns of a set of antenna elements;
• determine a set of channel estimations based on the set of reference signals, wherein a channel estimation corresponds to a radiating pattern in the set of radiating patterns;
• compute a first symbol constellation based on the channel estimation in the set of channel estimations;
• compute a set of weights based on the channel estimation in the set of channel estimations and the first symbol constellation;
• transmit the set of weights to the first communication device;
• and
• transmit the first symbol constellation to the first communication device.

A method for a first communication device comprising a set of antenna elements configured to operate in a set of radiating patterns;

• the method comprising:
• obtaining a first symbol constellation based on a radiating pattern in the set of radiating patterns;
• obtaining a set of weights associated with the first symbol constellation;
• obtaining a second symbol constellation based on the first symbol constellation and the set of weights;
• and
• controlling the set of antenna elements according to the radiating pattern in the set of radiating patterns for transmitting a set of information bits mapped onto the second symbol constellation.

A method for a second communication device, the method comprising:

• receiving a set of reference signals from a first communication device, wherein the set of reference signals is associated with a set of radiating patterns of a set of antenna elements;
• determining a set of channel estimations based on the set of reference signals, wherein a channel estimation corresponds to a radiating pattern in the set of radiating patterns;
• computing a first symbol constellation based on the channel estimation in the set of channel estimations;
• computing a set of weights based on the channel estimation in the set of channel estimations and the first symbol constellation;
• transmitting the set of weights to the first communication device;
• and
• transmitting the first symbol constellation to the first communication device.