Reporting of channel quality indicators for a non-linear detector

A method for wireless communication, comprising:

• determining at least one parameter based on at least one constellation constrained capacity function;
• and
• determining channel quantity indicators (CQIs) for multiple streams for a non-linear detector based on the at least one parameter,
• wherein the multiple streams comprise a first stream and a second stream,
• wherein the determining the at least one parameter comprises determining at least one first threshold for the first stream and at least one second threshold for the second stream based on the at least one constellation constrained capacity function, each first threshold corresponding to a different modulation order for the second stream, and each second threshold corresponding to a different modulation order for the first stream,
• wherein the determining the at least one first threshold and the at least one second threshold comprises
• determining a first constellation constrained capacity of a channel for the second stream with a particular modulation order being used for the second stream, Gaussian noise due to the first stream, and Gaussian channel noise,
• determining a second constellation constrained capacity of the channel for the second stream with the particular modulation order being used for the second stream and Gaussian channel noise,
• determining a first capacity of a channel for the first stream with Gaussian channel noise,
• determining a second capacity of the channel for the first stream with discrete interference from the second stream based on the first and second constellation constrained capacities and the first capacity, and
• determining a first threshold for the first stream with the particular modulation order being used for the second stream based on the second capacity.

A method for wireless communication, comprising:

• determining at least one parameter based on at least one constellation constrained capacity function;
• and
• determining channel quantity indicators (CQIs) for multiple streams for a non-linear detector based on the at least one parameter,
• wherein the multiple streams comprise a first stream and a second stream,
• wherein the determining the at least one parameter comprises determining at least one first threshold for the first stream and at least one second threshold for the second stream based on the at least one constellation constrained capacity function, each first threshold corresponding to a different modulation order for the second stream, and each second threshold corresponding to a different modulation order for the first stream,
• wherein the determining the CQIs for the multiple streams comprises
• determining a plurality of vertices of a graph formed based on the at least one first threshold on a horizontal axis and the at least one second threshold on a vertical axis,
• determining an overall throughput for the first and second streams at each of the plurality of vertices,
• determining a vertex associated with a highest overall throughput among the plurality of vertices, and
• determining CQIs for the first and second streams based on a first threshold and a second threshold corresponding to the vertex associated with the highest overall throughput.

An apparatus for wireless communication, comprising:

• means for determining at least one parameter based on at least one constellation constrained capacity function;
• and
• means for determining channel quantity indicators (CQIs) for multiple streams for a non-linear detector based on the at least one parameter,
• wherein the multiple streams comprise a first stream and a second stream,
• wherein the means for determining the at least one parameter comprises means for determining at least one first threshold for the first stream and at least one second threshold for the second stream based on the at least one constellation constrained capacity function, each first threshold corresponding to a different modulation order for the second stream, and each second threshold corresponding to a different modulation order for the first stream,
• wherein the means for determining the at least one first threshold and the at least one second threshold comprises means for determining the at least one first threshold and the at least one second threshold based further on a precoding matrix and a channel matrix, and
• wherein the means for determining the CQIs for the multiple streams comprises
• means for evaluating each of a plurality of precoding matrices,
• means for selecting a precoding matrix associated with a highest overall throughput among the plurality of precoding matrices, and
• means for determining CQIs for the first and second streams based on a first threshold and a second threshold corresponding to the highest overall throughput for the selected precoding matrix.

An apparatus for wireless communication, comprising:

• means for determining at least one parameter based on at least one constellation constrained capacity function;
• and
• means for determining channel quantity indicators (CQIs) for multiple streams for a non-linear detector based on the at least one parameter,
• wherein the multiple streams comprise a first stream and a second stream,
• wherein the means for determining the at least one parameter comprises means for determining at least one first threshold for the first stream and at least one second threshold for the second stream based on the at least one constellation constrained capacity function, each first threshold corresponding to a different modulation order for the second stream, and each second threshold corresponding to a different modulation order for the first stream,
• wherein the means for determining the at least one first threshold and the at least one second threshold comprises
• means for determining a first constellation constrained capacity of a channel for the second stream with a particular modulation order being used for the second stream, Gaussian noise due to the first stream, and Gaussian channel noise,
• means for determining a second constellation constrained capacity of the channel for the second stream with the particular modulation order being used for the second stream and Gaussian channel noise,
• means for determining a first capacity of a channel for the first stream with Gaussian channel noise,
• means for determining a second capacity of the channel for the first stream with discrete interference from the second stream based on the first and second constellation constrained capacities and the first capacity, and
• means for determining a first threshold for the first stream with the particular modulation order being used for the second stream based on the second capacity.

An apparatus for wireless communication, comprising:

• means for determining at least one parameter based on at least one constellation constrained capacity function;
• and
• means for determining channel quantity indicators (CQIs) for multiple streams for a non-linear detector based on the at least one parameter,
• wherein the multiple streams comprise a first stream and a second stream,
• wherein the means for determining the at least one parameter comprises means for determining at least one first threshold for the first stream and at least one second threshold for the second stream based on the at least one constellation constrained capacity function, each first threshold corresponding to a different modulation order for the second stream, and each second threshold corresponding to a different modulation order for the first stream,
• wherein the means for determining the CQIs for the multiple streams comprises
• means for determining a plurality of vertices of a graph formed based on the at least one first threshold on a horizontal axis and the at least one second threshold on a vertical axis,
• means for determining an overall throughput for the first and second streams at each of the plurality of vertices,
• means for determining a vertex associated with a highest overall throughput among the plurality of vertices, and
• means for determining CQIs for the first and second streams based on a first threshold and a second threshold corresponding to the vertex associated with the highest overall throughput.

An apparatus for wireless communication, comprising:

• at least one processor configured to determine at least one parameter based on at least one constellation constrained capacity function, and to determine channel quantity indicators (CQIs) for multiple streams for a non-linear detector based on the at least one parameter,
• wherein the multiple streams comprise a first stream and a second stream,
• wherein the at least one processor is configured to determine at least one first threshold for the first stream and at least one second threshold for the second stream based on the at least one constellation constrained capacity function, each first threshold corresponding to a different modulation order for the second stream, and each second threshold corresponding to a different modulation order for the first stream,
• wherein the at least one processor is configured to determine the at least one first threshold and the at least one second threshold based further on a precoding matrix and a channel matrix, and
• wherein the at least one processor is configured to evaluate each of a plurality of precoding matrices, to select a precoding matrix associated with a highest overall throughput among the plurality of precoding matrices, and to determine CQIs for the first and second streams based on a first threshold and a second threshold corresponding to the highest overall throughput for the selected precoding matrix.

An apparatus for wireless communication, comprising:

• at least one processor configured to determine at least one parameter based on at least one constellation constrained capacity function, and to determine channel quantity indicators (CQIs) for multiple streams for a non-linear detector based on the at least one parameter,
• wherein the multiple streams comprise a first stream and a second stream,
• wherein the at least one processor is configured to determine at least one first threshold for the first stream and at least one second threshold for the second stream based on the at least one constellation constrained capacity function, each first threshold corresponding to a different modulation order for the second stream, and each second threshold corresponding to a different modulation order for the first stream,
• wherein the at least one processor is configured to
• determine a first constellation constrained capacity of a channel for the second stream with a particular modulation order being used for the second stream, Gaussian noise due to the first stream, and Gaussian channel noise,
• determine a second constellation constrained capacity of the channel for the second stream with the particular modulation order being used for the second stream and Gaussian channel noise,
• determine a first capacity of a channel for the first stream with Gaussian channel noise, to
• determine a second capacity of the channel for the first stream with discrete interference from the second stream based on the first and second constellation constrained capacities and the first capacity, and
• determine a first threshold for the first stream with the particular modulation order being used for the second stream based on the second capacity.

An apparatus for wireless communication, comprising:

• at least one processor configured to determine at least one parameter based on at least one constellation constrained capacity function, and to determine channel quantity indicators (CQIs) for multiple streams for a non-linear detector based on the at least one parameter,
• wherein the multiple streams comprise a first stream and a second stream,
• wherein the at least one processor is configured to determine at least one first threshold for the first stream and at least one second threshold for the second stream based on the at least one constellation constrained capacity function, each first threshold corresponding to a different modulation order for the second stream, and each second threshold corresponding to a different modulation order for the first stream,
• wherein the at least one processor is configured to
• determine a plurality of vertices of a graph formed based on the at least one first threshold on a horizontal axis and the at least one second threshold on a vertical axis,
• determine an overall throughput for the first and second streams at each of the plurality of vertices, to determine a vertex associated with a highest overall throughput among the plurality of vertices, and
• determine CQIs for the first and second streams based on a first threshold and a second threshold corresponding to the vertex associated with the highest overall throughput.

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• code for causing at least one computer to determine at least one parameter based on at least one constellation constrained capacity function, and
• code for causing the at least one computer to determine channel quantity indicators (CQIs) for multiple streams for a non-linear detector based on the at least one parameter,
• wherein the multiple streams comprise a first stream and a second stream,
• wherein the determining the at least one parameter comprises determining at least one first threshold for the first stream and at least one second threshold for the second stream based on the at least one constellation constrained capacity function, each first threshold corresponding to a different modulation order for the second stream, and each second threshold corresponding to a different modulation order for the first stream,
• wherein the determining the at least one first threshold and the at least one second threshold comprises determining the at least one first threshold and the at least one second threshold based further on a precoding matrix and a channel matrix, and
• wherein the determining the CQIs for the multiple streams comprises
• evaluating each of a plurality of precoding matrices,
• selecting a precoding matrix associated with a highest overall throughput among the plurality of precoding matrices, and
• determining CQIs for the first and second streams based on a first threshold and a second threshold corresponding to the highest overall throughput for the selected precoding matrix.

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• code for causing at least one computer to determine at least one parameter based on at least one constellation constrained capacity function, and
• code for causing the at least one computer to determine channel quantity indicators (CQIs) for multiple streams for a non-linear detector based on the at least one parameter,
• wherein the multiple streams comprise a first stream and a second stream,
• wherein the determining the at least one parameter comprises determining at least one first threshold for the first stream and at least one second threshold for the second stream based on the at least one constellation constrained capacity function, each first threshold corresponding to a different modulation order for the second stream, and each second threshold corresponding to a different modulation order for the first stream,
• wherein the determining the at least one first threshold and the at least one second threshold comprises
• determining a first constellation constrained capacity of a channel for the second stream with a particular modulation order being used for the second stream, Gaussian noise due to the first stream, and Gaussian channel noise,
• determining a second constellation constrained capacity of the channel for the second stream with the particular modulation order being used for the second stream and Gaussian channel noise,
• determining a first capacity of a channel for the first stream with Gaussian channel noise,
• determining a second capacity of the channel for the first stream with discrete interference from the second stream based on the first and second constellation constrained capacities and the first capacity, and
• determining a first threshold for the first stream with the particular modulation order being used for the second stream based on the second capacity.

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• code for causing at least one computer to determine at least one parameter based on at least one constellation constrained capacity function, and
• code for causing the at least one computer to determine channel quantity indicators (CQIs) for multiple streams for a non-linear detector based on the at least one parameter,
• wherein the multiple streams comprise a first stream and a second stream,
• wherein the determining the at least one parameter comprises determining at least one first threshold for the first stream and at least one second threshold for the second stream based on the at least one constellation constrained capacity function, each first threshold corresponding to a different modulation order for the second stream, and each second threshold corresponding to a different modulation order for the first stream,
• wherein the determining the CQIs for the multiple streams comprises
• determining a plurality of vertices of a graph formed based on the at least one first threshold on a horizontal axis and the at least one second threshold on a vertical axis,
• determining an overall throughput for the first and second streams at each of the plurality of vertices,
• determining a vertex associated with a highest overall throughput among the plurality of vertices, and
• determining CQIs for the first and second streams based on a first threshold and a second threshold corresponding to the vertex associated with the highest overall throughput.