Low Complexity Beamforming Scheme
AssigneeFuturewei Technologies, Inc.
InventorYoung Hoon Kwon
Life of this patent
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Abstract
Beamforming can be simplified by selecting beamforming parameters without relying on channel state information (CSI). More specifically, beamforming parameters may be selected without CSI by applying different beamforming weight vectors to different subcarriers of a reference packet, and thereafter identifying which subcarrier had the highest signal quality upon reception of the reference packet by the user equipment (UE). The reference packet may be any packet, including a beacon packet, a null data packet, and other packets that are communicated periodically by an access point (AP). One or multiple codebooks may be used, and different codewords (or sets of codewords) may be applied in a time division multiplying (TDM) fashion.
Claims20
A method for selecting beamforming parameters, the method comprising:
- applying a plurality of beamforming weight vectors to a reference packet;
- and
- communicating the reference packet over a plurality of sub-carriers, wherein the plurality of beamforming weight vectors are applied to the reference packet such that different beamforming weight vectors are applied to different sub-carriers.
A transmitting device comprising:
- a processor;
- and
- a computer readable storage medium storing programming for execution by the processor, the programming including instructions to:
- apply a plurality of beamforming weight vectors to a reference packet;
- and
- communicate the reference packet over a plurality of sub-carriers, wherein the instructions to apply the plurality of beamforming weight vectors to the reference packet include instructions to apply the plurality of beamforming weight vectors such that different beamforming weight vectors are applied to different sub-carriers.
A method for selecting beamforming weights, the method comprising:
- receiving, by a station (STA), a reference packet from a transmitter, wherein the reference packet is received over a plurality of sub-carriers, and wherein the transmitter applies different beamforming weight vectors to different ones of the plurality of sub-carriers when transmitting the reference packet;
- identifying a sub-carrier in the plurality of sub-carriers having a highest signal quality;
- and
- transmitting an index to the transmitter, the index identifying the sub-carrier having the highest signal quality.
A receiving device comprising:
- a processor;
- and
- a computer readable storage medium storing programming for execution by the processor, the programming including instructions to:
- receive a reference packet from a transmitter, wherein the reference packet is received over a plurality of sub-carriers, and wherein the transmitter applies different beamforming weight vectors to different ones of the plurality of sub-carriers when transmitting the reference packet;
- identify a sub-carrier in the plurality of sub-carriers having a highest signal quality;
- and
- transmit an index to the transmitter, the index identifying the sub-carrier having the highest signal quality.
Dependencies are inferred from the claim text.