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Method for Prediction of Channel State Information in Multi-Antenna Communication Systems

Project ID: 1737-AP
Available for licensing

Background

In a multiple-input, multiple-output (MIMO) communication system, a significant improvement in capacity and link quality can be achieved if the transmitter has full or partial knowledge of the propagation channel state information (CSI) observed at the receiver side. Unfortunately, communicating the high-precision CSI from the receiver back to the transmitter takes away the available uplink bandwidth. A limited feedback technique, where the quantized CSI is communicated as the index of a codeword in a codebook of quantized CSI, is now widely used in standards such as IEEE 802.16e and 3GPP LTE. Prior art in codebook-based feedback used periodic feedback to adapt to changing propagation channel.

Invention Description

This invention is a method and apparatus for feedback and prediction of CSI for limited-feedback MIMO communication systems. A method for feedback is described where the quantized CSI and quantized prediction parameter is fed back. Using the quantized CSI and quantized prediction parameter, a method and apparatus for deriving a predicted CSI is disclosed. No feedback is needed during the prediction state, thus reducing the overall feedback requirement significantly. Furthermore, since the predicted CSI is derived, rather than being from a codebook, higher resolution CSI is obtained.

Benefits

Feedback is required only during initialization.
No feedback is necessary during prediction (prior art used periodic feedback of codebook index to track the changes in the propagation channel).
Higher resolution CSI that results in higher capacity and lower bit error rate performance in MIMO communication systems.

Features

The invention uses initial condition to predict the future CSI sequence.
Periodic feedback is not needed to track the changes in the propagation channel.
The predicted CSI is derived, rather than taken from a codebook.

Market Potential/Applications

Present and future MIMO communication equipment such as in IEEE 802.11n, IEE 802.16e/m, 3GPP LTE, 3GPP LTE-Advanced, 3GPP2 UMB, and future wireless standards which may employ multi-user multiple antenna technologies.

UT Researcher

Robert W. Heath, Jr., Ph.D., Electrical and Computer Engineering, The University of Texas at Austin
Takao Inoue, Electrical and Computer Engineering, The University of Texas at Austin

OTC Contact Information

Jitendra Jain, Licensing Specialist
jjain@otc.utexas.edu
512-471-9055