Wireless communication system and method of joint beamforming wireless communication
View Patent ↗A wireless communication system and joint beamforming method across multiple base stations for communicating with mobile stations. The wireless communication system communication system includes base stations and mobile stations. At least one of the base stations includes a joint beamformer controlling beamforming for the base stations. Each of the mobile stations receive information from the base stations, maintain a multiple-input and multiple-output active set (MAS) of base stations, and provide precoder weights to each of the base stations included in the MAS. The joint beamformer calculates joint beamforming weights for controlling communications between the base stations and mobile stations.
1. A method for wireless communications comprising:
receiving precoder weights associated with at least two mobile stations;
calculating a matrix based on the received precoder weights; and
controlling beamforming for antennas of multiple base stations used to communicate to the at least two mobile stations based on the calculated matrix.
2. The method of claim 1 , wherein each entry of the calculated matrix is a complex Gaussian representing the channel between a q th base station transmit antenna and a p th mobile station receive antenna, q representing one of a plurality of base station transmit antennas transmitting to the mobile station and p representing one of a plurality of receive antennas of the mobile station.
3. The method of claim 1 , wherein receiving the precoder weights receives at least one of the precoder weights directly from at least one of the mobile stations.
4. The method of claim 1 , wherein receiving the precoder weights receives at least one of the precoder weights from a base station.
5. The method of claim 1 , further comprising:
performing a mapping function on the calculated matrix to obtain a joint beamforming weight for each of the multiple base stations.
6. The method of claim 5 , further comprising:
transmitting the joint beamforming weight to a corresponding base station, the transmitted beamforming weight being used by the corresponding base stations to control communications between the corresponding base station and at least one of the mobile stations.
7. The method of claim 1 , wherein receiving precoder weights receives multiple precoder weights simultaneously.
8. The method of claim 1 , wherein receiving precoder weights receives a signal including multiple precoder weights being one of superimposed with each other and orthogonally arranged with each other.
9. The method of claim 1 , wherein receiving precoder weights receives at least two of the precoder weights that are associated with different antenna configurations of a base station.
10. A method of claim 1 , wherein at least one of the at last least two mobile stations is not served by a base station controlling the beamforming.
11. A method for wireless communications comprising:
receiving at least one precoder weight from a mobile station, the precoder weight representing a communication channel with a mobile station;
transmitting the received at least one precoder weight to a joint beamformer for multiple base stations;
receiving at least a portion of a joint beamforming weight; and
communicating with the mobile station based on the received joint beamforming weight.
12. The method of claim 11 , wherein receiving at least one precoder weight receives multiple precoder weights from different mobile stations.
13. The method of claim 11 , wherein receiving at least one precoder weight receives multiple precoder weights simultaneously.
14. The method of claim 11 , wherein receiving at least one precoder weight receives a signal including multiple precoder weights being one of superimposed with each other and orthogonally arranged with each other.
15. The method of claim 11 , wherein receiving at least one precoder weight receives at least two of the precoder weights that are associated with different antenna configurations of a base station.
16. A method for wireless communications comprising:
maintaining a multiple-input and multiple-output active set (MAS) of base stations;
calculating multiple precoder weights based on information received from base stations included in the MAS; and
sending the calculated precoder weights to the base stations included in the MAS.
17. The method of claim 16 , wherein calculating multiple precoder weights calculates different precoder weights associated that are associated with different antenna configurations of the base stations.
18. The method of claim 16 , wherein sending the calculated precoder weights sends multiple the multiple precoder weights simultaneously.
19. The method of claim 16 , wherein sending the calculated precoder weights are sent in a signal including the precoder weights being one of superimposed with each other and orthogonally arranged with each other.
20. A wireless communication system comprising:
a plurality of base stations, at least one of the base stations including a joint beamformer controlling beamforming for the base stations; and
a plurality of mobile stations, each of the mobile stations receiving information from the base stations, a multiple-input and multiple-output active set (MAS) of base stations; and providing precoder weights to each of the base stations included in the MAS.
21. The wireless communication system of claim 20 , wherein the joint beamformer calculates joint beamforming weights for controlling communications between the base stations and mobile stations.