Method, apparatus and communication unit
AssigneeIntel Mobile Communications GmbH
InventorFrank Dietrich
Life of this patent
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Abstract
A method, an apparatus and a communication unit for generating precoding feedback information in a multiple frequency radio transmission system are disclosed. A rank for precoding matrices, wherein the rank is constant over the multiple frequencies, is selected and a plurality of precoding matrices having the selected rank are selected. A different precoding matrix is selected for each frequency subset of the multiple frequencies.
Claims12
A method for generating precoding feedback information in a multiple frequency radio transmission system, comprising:
- selecting a wideband precoding matrix that corresponds to a frequency band comprising at least one frequency;
- and
- selecting a plurality of narrow band precoding matrices each having a rank corresponding to a rank of the selected wideband precoding matrix, wherein each of the plurality of narrow band precoding matrices is selected for a given frequency band,
- wherein selecting the plurality of narrow band precoding matrices comprises selecting at least one of the plurality of narrow band precoding matrices based on a maximum likelihood estimate of a transmit correlation matrix over a respective narrow band.
A method for generating precoding feedback information in a multiple frequency radio transmission system, comprising:
- selecting a wideband precoding matrix that corresponds to a frequency band comprising at least one frequency;
- and
- selecting a plurality of narrow band precoding matrices each having a rank corresponding to a rank of the selected wideband precoding matrix, wherein each of the plurality of narrow band precoding matrices is selected for a given frequency band,
- wherein selecting the wideband precoding matrix comprises selecting the wideband precoding matrix based on an optimization of a data rate in the multiple frequency radio transmission system.
An apparatus for generating precoding feedback information in a multiple frequency radio transmission system, comprising:
- a first device configured to select a wideband precoding matrix that corresponds to a frequency band comprising a plurality of frequencies;
- and
- a second device configured to select a plurality of narrow band precoding matrices, each having a rank corresponding to a rank of the selected wideband precoding matrix, wherein each of the plurality of narrow band precoding matrices is selected for a given frequency band,
- wherein the wideband precoding matrix is selected by maximizing a cost function as defined by
- Fc(M)=log2 det(I+Mσn−2) wherein
- M=PHRTxP wherein
- P being the wideband precoding matrix, RTx the maximum likelihood estimate of the transmit correlation matrix, I the identity matrix, σn the strength of the additive spatially white Gaussian noise.
An apparatus for generating precoding feedback information in a multiple frequency radio transmission system, comprising:
- a first device configured to select a wideband precoding matrix that corresponds to a frequency band comprising a plurality of frequencies;
- and
- a second device configured to select a plurality of narrow band precoding matrices, each having a rank corresponding to a rank of the selected wideband precoding matrix, wherein each of the plurality of narrow band precoding matrices is selected for a given frequency band,
- wherein the transmission signal is received by a receiver comprising a linear minimum mean square error (MMSE) equalizer evaluating the signal-to-interference-plus-noise ratios for the given frequency band.
An apparatus for generating precoding feedback information in a multiple frequency radio transmission system, comprising:
- a first device configured to select a wideband precoding matrix that corresponds to a frequency band comprising a plurality of frequencies;
- and
- a second device configured to select a plurality of narrow band precoding matrices, each having a rank corresponding to a rank of the selected wideband precoding matrix, wherein each of the plurality of narrow band precoding matrices is selected for a given frequency band,
- wherein the first device and the second device comprise optimization units configured to optimize the data rate in the multiple frequency radio transmission system.
Dependencies are inferred from the claim text.