Communication devices for shaping symbol constellations
First and second communication devices shape symbol constellation in wireless transmissions. The first communication device obtains a second symbol constellation based on the first symbol constellation and the set of weights, where the first symbol constellation is based on a radiating pattern in a set of radiating patterns for the first communication device and the weights are derived based on the first symbol constellation. Thereafter, the set of antenna elements are controlled according to the radiating pattern for transmitting a set of information bits mapped onto the second symbol constellation. Thereby, the second symbol constellation is customized to the radio environment to enable smart radio that enjoys improved signal design and thereby better performance.
1. A first communication device comprising:
a set of antenna elements configured to operate in a set of radiating patterns; and
a processor configured to:
obtain a first symbol constellation based on a radiating pattern in the set of radiating patterns,
obtain a set of weights associated with the first symbol constellation,
obtain a second symbol constellation based on the first symbol constellation and the set of weights, and
control 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.
2. The first communication device according to claim 1 , wherein each antenna element in the set of antenna elements is configured by the processor to operate in multiple radiating states so that the set of antenna elements operates in the set of radiating patterns.
3. The first communication device according to claim 2 , wherein the processor arranges the set of antenna elements within a range of an emitting element configured to emit a radio wave, and wherein the set of antenna elements is a set of radio frequency mirrors.
4. The first communication device according to claim 1 , wherein the processor obtains the first symbol constellation by
receiving a set of channel estimations from a second communication device, wherein a channel estimation from the set of channel estimations corresponds to the radiating pattern in the set of radiating patterns, and
computing the first symbol constellation based on the channel estimation in the set of channel estimations.
5. The first communication device according to claim 4 , wherein processor computes the first symbol constellation by:
computing the first symbol constellation based on the channel estimation in the set of channel estimations and source based modulation.
6. The first communication device according to claim 1 , wherein the processor obtains the set of weights by:
receiving a set of channel estimations from a second communication device, wherein a channel estimation from the set of channel estimations corresponds to the radiating pattern in the set of radiating patterns, and
computing the set of weights based on the channel estimation [from the set of channel estimations] in the set of channel estimations and the first symbol constellation.
7. The first communication device according to claim 1 , wherein the processor obtains the second symbol constellation by:
mapping the first symbol constellation onto the set of weights to obtain the second symbol constellation.
8. The first communication device according to claim 7 , wherein the processor obtains the second symbol constellation by:
after mapping the first symbol constellation onto the set of weights, performing power control and phase shift to obtain the second symbol constellation.
9. The first communication device according to claim 7 , wherein the second symbol constellation is any of M-PSK (M-ary Phase Shift Keying) or M-QAM (M-ary Quadrature Amplitude Modulation).
10. 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.
11. 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.
12. The method of claim 11 , further comprising:
configuring each antenna element in the set of antenna elements to operate in multiple radiating states so that the set of antenna elements operates in the set of radiating patterns; and
arranging the set of antenna elements within a range of an emitting element configured to emit a radio wave, and wherein the set of antenna elements is a set of radio frequency mirrors.
13. The method of claim 11 , wherein the obtaining the first symbol constellation includes:
receiving a set of channel estimations from a second communication device, wherein a channel estimation from the set of channel estimations corresponds to the radiating pattern in the set of radiating patterns, and
computing the first symbol constellation based on the channel estimation in the set of channel estimations.
14. The method of claim 11 , wherein the obtaining the set of weights includes:
receiving a set of channel estimations from a second communication device, wherein a channel estimation from the set of channel estimations corresponds to the radiating pattern in the set of radiating patterns, and
computing the set of weights based on the channel estimation in the set of channel estimations and the first symbol constellation.
15. The method of claim 11 , wherein the obtaining the second symbol constellation includes:
mapping the first symbol constellation onto the set of weights to obtain the second symbol constellation; and
after mapping the first symbol constellation onto the set of weights, performing power control and phase shift to obtain the second symbol constellation.
16. 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.