Efficient rank extraction method in MIMO receiver and apparatus therefor
AssigneeGCT Research, Inc.
InventorsJi Ho Jang, In Seok Hwang, Tae Won Park
Life of this patent
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Abstract
The present invention relate to a method of extracting an optimum rank without considering a precoding matrix indicator (PMI) in a multiple-input multiple-output (MIMO) receiver, the method including calculating a correlation matrix from a MIMO channel matrix between a base station antenna and an MIMO receiver antenna; obtaining an eigenvalue from the correlation matrix; calculating channel capacity for each rank on the basis of the obtained eigenvalue; and selecting a rank corresponding to a channel capacity having a maximum value among the calculated channel capacities for each rank as an optimum rank.
Claims17
A method of extracting a rank without considering a precoding matrix indicator (PMI) in a multiple-input multiple-output (MIMO) receiver, the method comprising:
- calculating a plurality of correlation matrices from a plurality of MIMO channel matrices between a base station antenna and a MIMO receiver antenna;
- obtaining a plurality of eigenvalues from the plurality of correlation matrices;
- calculating a plurality of channel capacities for a plurality of rank candidate values on the basis of the plurality of eigenvalues;
- and
- selecting a rank candidate value corresponding to a maximum channel capacity among the plurality of channel capacities as the rank,
- wherein the calculating of the plurality of channel capacities comprises:
- calculating an upper limit of a channel capacity for each of the plurality of rank candidate values by mapping the eigenvalues differently for each layer;
- and
- approximating each of the plurality of channel capacities using the upper limit.
A non-transitory computer-readable recording medium having recorded thereon program for executing a method extracting a rank without considering a precoding matrix indicator (PMI) in a multiple-input multiple-output (MIMO) receiver, the method including:
- calculating a plurality of correlation matrices from a plurality of MIMO channel matrices between a base station antenna and a MIMO receiver antenna;
- obtaining a plurality of eigenvalues from the plurality of correlation matrices;
- calculating a plurality of channel capacities for a plurality of rank candidate values on the basis of the plurality of eigenvalues;
- and
- selecting a rank candidate value corresponding to a maximum channel capacity among the plurality of channel capacities as the rank,
- wherein the calculating of the plurality of channel capacities comprises:
- calculating an upper limit of a channel capacity for each of the plurality of rank candidate values by mapping the eigenvalues differently for each layer;
- and
- approximating each of the plurality of channel capacities using the upper limit.
A MIMO receiver for extracting a rank without considering a PMI, the receiver comprising:
- a plurality of antennas configured to receive a reference signal;
- a rank extractor configured to:
- obtain a plurality of correlation matrices from a plurality of MIMO channel matrices between a base station antenna of a base station and the antennas using the reference signal;
- obtain a plurality of eigenvalues from the plurality of correlation matrices;
- calculate a plurality of channel capacities for a plurality of rank candidate values on the plurality of eigenvalues;
- and
- select a rank candidate value corresponding to a maximum channel capacity among the plurality of channel capacities as the rank,
- wherein MIMO channel state information including the rank is generated and reported to the base station in uplink, and
- wherein the rank extractor is configured to:
- calculate an upper limit of a channel capacity for each of the plurality of rank candidate values by mapping the eigenvalues differently for each layer;
- and
- approximate each of the plurality of channel capacities using the upper limit.
Dependencies are inferred from the claim text.