Back to results
US 9,806,774 B2Granted
CSI feedback reduction for MIMO interference alignment
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorsVincent Kin Nang Lau, Xiongbin Rao, Liangzhong Ruan
Life of this patent
Estimating the term…
Abstract
Channel state information (CSI) is reduced for a multi input multi output (MIMO) channel, in which feeding back a part of the CSI matrix is sufficient to align interference in a MIMO network. A feedback dimension quantifies a cost of the CSI feedback of the interference in the MIMO network. A feedback profile is determined that achieves a tradeoff between degrees of freedom, antenna resources and the cost of the feedback. The feedback profile parameterizes a feedback function, which determines how the CSI matrices are fed back to the transmitter. The precoders of the network are adaptive to only the partial CSI knowledge at the transmitter.
Claims31
A system, comprising:
- a memory storing executable components;
- and
- a processor, communicatively coupled to the memory, that facilitates execution of the executable components comprising:
- a feedback processor configured to receive a set of partial channel state information as feedback of an interference network comprising a number of data streams in a multiple input multiple output (MIMO) channel, and to facilitate interference alignment of the number of data streams in the MIMO channel, wherein the partial channel state information comprises channel data representing channel fading matrix coefficients associated with transmissions from a transmitter device to a receiver device;
- a feedback dimension processor configured to determine a feedback cost by determining a feedback dimension defined as a sum of dimensions of Grassmanian manifolds applied to the number of data streams in the MIMO channel, the feedback cost being a cost of communicating the set of partial channel state information as the feedback, wherein the feedback is determined according to the feedback cost;
- and
- a precoder processor configured to encode a signal in a data stream of the number of data streams as a function of the set of partial channel state information.
4 more elements
A device, comprising:
- a memory storing executable components;
- and
- a processor, communicatively coupled to the memory, that facilitates execution of the executable components comprising:
- a feedback component configured to communicate a portion of channel state information as feedback of an interference network comprising a number of data streams in a multiple input multiple output (MIMO) channel, and to achieve interference alignment of the number of data streams in the MIMO channel, wherein the portion of the channel state information comprises channel data representing channel fading matrix coefficients associated with transmissions from a transmitter device to a receiver device;
- a feedback dimension component configured to determine a feedback cost by determining a feedback dimension defined as a sum of dimensions of Grassmanian manifolds applied to the number of data streams in the MIMO channel, the feedback cost being a cost of communicating the portion of channel state information as the feedback, wherein the feedback is determined according to the feedback cost;
- and
- a decorrelator component configured to decode a signal in a data stream as a function of the portion of channel state information.
4 more elements
A method comprising:
- selecting, by a device comprising a processor, a portion of channel state information from among an aggregate of channel state information in a multiple input multiple output (MIMO) channel;
- determining a feedback cost of feedback that comprises the portion of channel state information, by determining a feedback dimension defined as a sum of dimensions of Grassmanian manifolds applied to a number of data streams in the MIMO channel, the feedback cost being a cost of communicating the portion of partial channel state information as the feedback, wherein the feedback is determined according to the feedback cost;
- communicating, by the device, the feedback for interference alignment of the number of data streams in the MIMO channel, wherein the portion of channel state information comprises channel data representing channel fading matrix coefficients associated with transmissions from a transmitter device to a receiver device;
- and
- decoding, by the device, a signal in a data stream of the number of data streams as a function of the portion of channel state information.
2 more elements
A method, comprising:
- receiving, by a device comprising a processor in a multiple input multiple output (MIMO) channel, a portion of channel state information from among an aggregate of channel state information;
- analyzing, by the device, the portion of channel state information as feedback of an interference network based on a feedback process defined to achieve interference alignment of a number of data streams in the MIMO channel, wherein the portion of the channel state information comprises channel data representing a matrix of channel fading coefficients associated with transmission from a transmission device to a receiver device;
- determining, by the device, a feedback cost by determining a feedback dimension defined as a sum of dimensions of Grassmanian manifolds applied to the number of data streams in the MIMO channel, the feedback cost being a cost of communicating the portion of channel state information as the feedback, wherein the feedback is determined according to the feedback cost;
- and
- encoding, by the device, a signal in a data stream of the number of data streams as a function of the portion of channel state information.
2 more elements
Dependencies are inferred from the claim text.