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US 8,897,725 B2Granted
Beamforming
AssigneeNEC Laboratories America, Inc.
InventorsNarayan Prasad, Kishore Ramachandran, Sampath Rangarajan
Life of this patent
Estimating the term…
Abstract
A method implemented in a wireless communications system is disclosed. The method includes: transmitting, from a wireless transmitter having a transmit antenna array, a first signal on each of a plurality of different transmit beams in transmitter (TX) sector level sweep (SLS), receiving, at a wireless receiver having a receive antenna array, the first signal, and determining, at the wireless receiver, quality of the first signal. Other methods, systems, and apparatuses also are disclosed.
Claims11
A method implemented in a wireless communications system, the method comprising:
- transmitting, from a wireless transmitter having a transmit antenna array, a first signal on each of a plurality of different transmit beams in transmitter (TX) sector level sweep (SLS);
- receiving, at a wireless receiver having a receive antenna array, the first signal;
- determining, at the wireless receiver, quality of the first signal;
- transmitting, from the wireless transmitter, a second signal to allow the wireless receiver to sweep a plurality of receive beams;
- receiving, at the wireless receiver, the second signal on each of the plurality of receive beams;
- determining, at the wireless receiver, quality of the second signal;
- transmitting, from the wireless transmitter, an indication of direction of departure (DoD) for each of the plurality of different transmit beams;
- and
- receiving, at the wireless receiver, the indication of DoD,
- wherein the indication of DoD comprises an identifier (ID) of said each of the plurality of different transmit beams,
- wherein the first signal is received at the wireless receiver on an omni-directional receive beam or a quasi-omni directional receive beam, and
- wherein the second signal is transmitted from the wireless transmitter on an omni-directional transmit beam or a quasi-omni directional transmit beam.
9 more elements
A method implemented in a wireless transmitter having a transmit antenna array, the method comprising:
- transmitting a first signal on each of a plurality of different transmit beams in transmitter (TX) sector level sweep (SLS);
- transmitting a second signal to allow a wireless receiver having a receive antenna array to sweep a plurality of receive beams;
- and
- transmitting an indication of direction of departure (DoD) for each of the plurality of different transmit beams,
- wherein the wireless receiver receives the first signal and
- determines quality of the first signal,
- wherein the wireless receiver receives the second signal on each of the plurality of receive beams and determines quality of the second signal,
- wherein the wireless receiver receives the indication of DoD,
- wherein the indication of DoD comprises an identifier (ID) of said each of the plurality of different transmit beams,
- wherein the first signal is received at the wireless receiver on an omni-directional receive beam or a quasi-omni directional receive beam, and
- wherein the second signal is transmitted from the wireless transmitter on an omni-directional transmit beam or a quasi-omni directional transmit beam.
8 more elements
A method implemented in a wireless receiver having a receive antenna array, the method comprising:
- receiving a first signal;
- determining quality of the first signal;
- receiving a second signal on each of a plurality of receive beams;
- determining quality of the second signal;
- and
- receiving an indication of direction of departure (DoD),
- wherein a wireless transmitter having a transmit antenna array transmits the first signal on each of a plurality of different transmit beams in transmitter (TX) sector level sweep (SLS),
- wherein the wireless transmitter transmits the second signal to allow the wireless receiver to sweep the plurality of receive beams,
- wherein the wireless transmitter transmits the indication of DoD for each of the plurality of different transmit beams,
- wherein the indication of DoD comprises an identifier (ID) of said each of the plurality of different transmit beams,
- wherein the first signal is received at the wireless receiver on an omni-directional receive beam or a quasi-omni directional receive beam, and
- wherein the second signal is transmitted from the wireless transmitter on an omni-directional transmit beam or a quasi-omni directional transmit beam.
9 more elements
A wireless communications system comprising:
- a wireless transmitter having a transmit antenna array to transmit a first signal on each of a plurality of different transmit beams in transmitter (TX) sector level sweep (SLS);
- and
- a wireless receiver having a receive antenna array to receive the first signal and
- determine quality of the first signal;
- wherein the wireless transmitter transmits a second signal to allow the wireless receiver to sweep a plurality of receive beams,
- wherein the wireless receiver receives the second signal on each of the plurality of receive beams and determines quality of the second signal,
- wherein the wireless transmitter transmits an indication of direction of departure (DoD) for each of the plurality of different transmit beams,
- wherein the wireless receiver receives the indication of DoD,
- wherein the indication of DoD comprises an identifier (ID) of said each of the plurality of different transmit beams,
- wherein the first signal is received at the wireless receiver on an omni-directional receive beam or a quasi-omni directional receive beam, and
- wherein the second signal is transmitted from the wireless transmitter on an omni-directional transmit beam or a quasi-omni directional transmit beam.
8 more elements
A transmitter circuit for a wireless transmitter having a transmit antenna array, the transmitter circuit comprising:
- a transmitting unit to transmit
- a first signal on each of a plurality of different transmit beams in transmitter (TX) sector level sweep (SLS),
- a second signal to allow a wireless receiver having a receive antenna array to sweep a plurality of receive beams, and
- an indication of direction of departure (DoD) for each of the plurality of different transmit beams,
- wherein the wireless receiver receives the first signal and
- determines quality of the first signal;
- wherein the wireless receiver receives the second signal on each of the plurality of receive beams and determines quality of the second signal,
- wherein the wireless receiver receives the indication of DoD,
- wherein the indication of DoD comprises an identifier (ID) of said each of the plurality of different transmit beams,
- wherein the first signal is received at the wireless receiver on an omni-directional receive beam or a quasi-omni directional receive beam, and
- wherein the second signal is transmitted from the wireless transmitter on an omni-directional transmit beam or a quasi-omni directional transmit beam.
8 more elements
A receiver circuit for a wireless receiver having a receive antenna array, the receiver circuit comprising:
- a receiving unit to receive
- a first signal,
- a second signal on each of a plurality of receive beams, and
- an indication of direction of departure (DoD);
- and
- a determination unit to determine quality of the first signal and quality of the second signal,
- wherein a wireless transmitter having a transmit antenna array transmits the first signal on each of a plurality of different transmit beams in transmitter (TX) sector level sweep (SLS),
- wherein the wireless transmitter transmits the second signal to allow the wireless receiver to sweep the plurality of receive beams,
- wherein the wireless transmitter transmits the indication of DoD for each of the plurality of different transmit beams,
- wherein the indication of DoD comprises an identifier (ID) of said each of the plurality of different transmit beams,
- wherein the first signal is received at the wireless receiver on an omni-directional receive beam or a quasi-omni directional receive beam, and
- wherein the second signal is transmitted from the wireless transmitter on an omni-directional transmit beam or a quasi-omni directional transmit beam.
9 more elements
Dependencies are inferred from the claim text.