Method of updating transmission channel information based on eaves-dropping of beamformed signals
AssigneeBroadcom Corporation
InventorsBertrand Hochwald, Harold Artes
Life of this patent
Estimating the term…
Abstract
A method and apparatus of providing a base station with updated transmission channel information is disclosed. The method includes the base station transmitting beamformed signals to a first terminal. A second terminal receives the transmitted beamformed signals, and measures a signal quality. The second terminal conveys back to the base station the measured signal quality, and a transmission identifier of the beamformed data signal.
Claims24
A method of aiding downlink transmission between a base station and a first wireless terminal, comprising:
- beamforming, by the base station, a wireless signal to a second wireless terminal;
- receiving, by the base station, from the first wireless terminal, a measurement of the wireless signal beamformed by the base station to the second wireless terminal, wherein the measurement is performed by the first wireless terminal by eaves-dropping on the wireless signal;
- and
- estimating, by the base station, downlink channel information based on the measurement, the downlink channel information comprising a channel estimation of a downlink channel from the base station to the first wireless terminal.
A method of aiding downlink transmission between a base station and a first wireless terminal, comprising:
- measuring a wireless signal of a plurality of wireless signals directed to a plurality of wireless terminals, using the first wireless terminal, wherein the wireless signal is cyclically-delayed by the base station and is beamformed to a second wireless terminal of the plurality of wireless terminals, the wireless signal being spatially orthogonal to other wireless signals of the plurality of wireless signals, wherein the measuring of the wireless signal comprises eaves-dropping on the wireless signal;
- and
- estimating, by the first wireless terminal, downlink channel information based on the measured wireless signal;
- conveying, from the first wireless terminal to the base station, the downlink channel information;
- and
- selecting, by the first wireless terminal, frequency sub-carriers of the wireless signal for reception, wherein the selecting comprises selecting based on a frequency dependency of the frequency sub-carriers of the cyclically-delayed wireless signal.
A method of aiding downlink transmission between a base station and a first wireless terminal, comprising:
- beamforming, by the base station, a first wireless signal to a second wireless terminal;
- receiving, by the base station from the first wireless terminal, a measurement of the first wireless signal beamformed by the base station to the second wireless terminal, wherein the measurement is performed by the first wireless terminal by eaves-dropping on the first wireless signal;
- estimating, by the base station, downlink channel information based on the measurement, the downlink channel information comprising a channel estimation of a downlink channel from the base station to the first wireless terminal;
- and
- beamforming, by the base station, a second wireless signal to the first wireless terminal, using the channel estimation.
Dependencies are inferred from the claim text.