Zero-forcing linear beamforming for coordinated cellular networks with distributed antennas
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsDennis Hui, Kambiz Zangi
Life of this patent
Estimating the term…
Abstract
In a distributed antenna system that includes a plurality of transmitters and a controller, a method, performed by the controller, may be characterized by performing dirty-paper coding on downlink transmissions to users based on an order of the users, calculating beamforming vectors to provide that each of the downlink transmissions associated with each of the users does not interfere with other users, and maximizing, based on the calculated beamforming vectors, a data rate subject to a power constraint of the distributed antenna system.
Claims37
In a distributed antenna system that includes a plurality of transmitters and a controller, a method, performed by the controller, comprising:
- performing dirty-paper coding on downlink transmissions to users based on an order of the users;
- calculating beamforming vectors to provide that each of the downlink transmissions associated with each of the users does not interfere with other users;
- distributing power among user streams based on a total transmit power;
- and
- maximizing, based on the calculated beamforming vectors, a data rate subject to a power constraint of the distributed antenna system.
A controller for coordinating data transmissions by antennas of a distributed antenna system, the controller comprising:
- a memory to store instructions;
- and
- a processor to execute the instructions to:
- select beamforming vectors associated with the distributed antenna system for transmission of data to users, where the beamforming vectors do not cause data transmissions to interfere with each other;
- and
- maximize, based on the selection of beamforming vectors, a data rate,
- wherein power is distributed among user streams based on a total transmit power.
A non-transitory computer-readable medium containing instructions executable by a controller associated with base stations of a distributed antenna system, the computer-readable medium comprises:
- one or more instructions for calculating beamforming vectors relating to downlink transmissions to users located in a plurality of cells based on an order of the users;
- and
- one or more instructions for maximizing a data rate subject to a transmit power constraint of the distributed antenna system,
- wherein power is distributed among user streams based on a total transmit power.
Dependencies are inferred from the claim text.