Beamforming in MIMO Systems
First Claim
Patent Images
1. A beamforming method between a first transceiver and a second transceiver, the method comprising:
- acquiring channel state information (CSI) by transmitting a signal employing at least a subset of a beamforming codebook from the first transceiver to the second transceiver and configuring the second transceiver to employ at least a subset of a combining codebook to acquire the CSI,estimating an optimal beamforming vector and an optimal combining vector from the CSI to produce an estimated optimal beamforming vector and an estimated optimal combining vector, andsending at least one of the estimated optimal beamforming vector and the estimated optimal combining vector to the first transceiver.
1 Assignment
0 Petitions
Accused Products
Abstract
A beamforming method comprises transmitting a training sequence from a transmitter array employing a set of beamforming vectors from a beamforming codebook. A receive array employs a combining codebook to acquire channel state information from the received transmissions, and estimates a preferred beamforming vector and a preferred combining vector. At least the preferred beamforming vector (and, optionally, the preferred combining vector) is transmitted back to the transmitter array.
-
Citations
25 Claims
-
1. A beamforming method between a first transceiver and a second transceiver, the method comprising:
-
acquiring channel state information (CSI) by transmitting a signal employing at least a subset of a beamforming codebook from the first transceiver to the second transceiver and configuring the second transceiver to employ at least a subset of a combining codebook to acquire the CSI, estimating an optimal beamforming vector and an optimal combining vector from the CSI to produce an estimated optimal beamforming vector and an estimated optimal combining vector, and sending at least one of the estimated optimal beamforming vector and the estimated optimal combining vector to the first transceiver. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method for employing a frame format for signaling between a first transceiver and at least a second transceiver to select beamforming and combining weights, the method comprising:
-
transmitting a signal from the first transceiver to the second transceiver, the signal comprising a plurality of transmission segments, wherein each of the plurality of transmission segments is transmitted with a different beam pattern from a predetermined beamforming codebook, listening for feedback from the at least second transceiver, and selecting at least one vector of a set based on feedback from the at least second transceiver, the set comprising at least one of beamforming weights and combining weights. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
-
-
16. A method for selecting beamforming and combining weights for at least a first transceiver comprising an antenna array communicatively coupled to a second transceiver comprising an antenna array, the method comprising:
-
receiving a signal at the second transceiver transmitted by the first wireless transceiver, the signal comprising a plurality of transmission segments wherein each of the plurality of transmission segments is transmitted with a different beam pattern from a predetermined beamforming codebook, estimating a preferred beamforming vector for the first transceiver from at least a subset of the plurality of transmission segments, estimating a preferred combining vector for the second transceiver, and sending at least one of the preferred beamforming vector and the preferred combining vector to the first transceiver during a listening period. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
-
Specification