MIMO transmission with rank adaptation for multi-gigabit 60 GHz wireless
AssigneeNEC Laboratories America, Inc.
InventorsMeilong Jiang, Guosen Yue
Life of this patent
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Abstract
A wireless system includes a transmitter with a baseband processor responsive to groups of transmitter antenna arrays for communicating over directional beams; and a receiver with a baseband processor responsive to groups of receiver antenna rays for communicating with the transmitter over the directional beams, the receiver including both a rank adaptation providing a transmit mode feedback to the transmitter and a blind beamforming providing a transmit beamformer index feedback to the transmitter and receiver groups of antenna arrays.
Claims17
A wireless system comprising:
- a transmitter with a baseband processor responsive to groups of transmitter antenna arrays for communicating over directional beams;
- and a receiver with a baseband processor responsive to groups of receiver antenna arrays for communicating with said transmitter over said directional beams, said receiver including both a rank adaptation providing a transmit mode feedback to said transmitter and a blind beamforming providing a transmit beamformer index feedback to said transmitter and receiver groups of antenna arrays;
- wherein said blind beamforming comprises generating enhanced perturbation vectors, an iteration to generate new beamformers responsive to said perturbation vectors and a current beam beamformer, and determining a received power for all combination of transmitter and receiver antenna beamformers responsive to said new beamformers.
A method for wireless communication comprising the steps of:
- communicating over directional beams by a transmitter with a baseband processor responsive to groups of transmitter antenna arrays for;
- and
- communicating with said transmitter over said directional beams by a receiver with a baseband processor responsive to groups of receiver antenna arrays, said receiver including both a rank adaptation providing a transmit mode feedback to said transmitter and a blind beamforming providing a transmit beamformer index feedback to said transmitter and receiver groups of antenna arrays;
- wherein said blind beamforming comprises generating enhanced perturbation vectors, an iteration to generate new beamformers responsive to said perturbation vectors and a current beam beamformer, and determining a received power for all combination of transmitter and receiver antenna beamformers responsive to said new beamformers.
A wireless system comprising:
- a transmitter with a baseband processor responsive to groups of transmitter antenna arrays for communicating over directional beams;
- and
- a receiver with a baseband processor responsive to groups of receiver antenna arrays for communicating with said transmitter over said directional beams, said receiver including both a rank adaptation providing a transmit mode feedback to said transmitter and a blind beamforming providing a transmit beamformer index feedback to said transmitter and receiver groups of antenna arrays;
- wherein said rank adaptation comprises a capacity evaluation responsive to at least one of composite channel gain and capacity prediction obtained at said receiver, said transmission being adaptively chosen from one of a high rank spatial multiplexing and a rank-1 beamforming whichever gives higher throughput;
- and where said capacity for said high rank spatial multiplexing and said rank1 beamforming is respectively given by
- C
- rankM
- =
- log
- 2
-
- (
- det
-
- (
- I
- +
- P
- M
-
- H
- ~
-
- H
- ~
- ′
- )
- )
- and Crank1=log2(1+P|ũ{tilde over (H)}{tilde over (w)}|2)), where {tilde over (H)} is a composite channel gain, P is the total transmit power, M is number of subarrays of antenna arrays.
Dependencies are inferred from the claim text.