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US 2013/0094604 A1Published application
Precoding For Coordinated Multi-Point Joint Transmission
AssigneeNokia Siemens Networks Oy
InventorsBishwarup Mondal, Timothy A. Thomas, Eugene Visotsky
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Abstract
The specification and drawings present a new method, apparatus and software related product (e.g., a computer readable memory) for implementing precoding for a coordinated multi-point joint transmission in LTE wireless systems using a specific product structure for a multi-point precoding matrix with designed and/or specified usage of multi-point codebooks for generating spatial data stream between a UE having multiple antennas and a plurality of cells.
Claims20
A method comprising:
- receiving a data stream by a precoder of a device engaged in a coordinated multi-point joint transmission involving links between a user equipment having multiple receive antennas and a plurality of transmission points;
- and
- precoding the data stream to form a spatial data stream signal using a multi-point precoding matrix for one multi-point link between the user equipment and the plurality of transmission points where the multi-point precoding matrix is given by a multiplication of at least two matrices:
- a first matrix constructed from single point precoding matrices for the plurality of transmission points and an inter-point precoding matrix for the plurality of transmission points determined using predefined rules,
- wherein a rank of the multi-point precoding matrix is larger than one.
2 more elements
An apparatus comprising:
- a processing system comprising at least one processor and a memory storing a set of computer instructions, in which the processing system is arranged to cause the apparatus to:
- receive a data stream by a precoder of a device engaged in a coordinated multi-point joint transmission involving links between a user equipment having multiple receive antennas and a plurality of transmission points;
- and
- precode the data stream to form a spatial data stream signal using a multi-point precoding matrix for one multi-point link between the user equipment and the plurality of transmission points where the multi-point precoding matrix is given by a multiplication of at least two matrices:
- a first matrix constructed from single point precoding matrices for the plurality of transmission points and an inter-point precoding matrix for the plurality of transmission points determined using predefined rules,
- wherein a rank of the multi-point precoding matrix is larger than one.
3 more elements
The apparatus of claim 15, wherein one or more of the inter-point precoding matrix and the multi-point power allocation matrix for the plurality of transmission points are identity matrices.
A method comprising:
- providing at least one feedback tracking signal by a receiving device engaged in a coordinated multi-point joint transmission involving links between a user equipment having multiple receive antennas and a plurality of transmission points,
- wherein the at least one feedback tracking signal comprises information for defining a multi-point precoding matrix for one multi-point link between the user equipment and the plurality of transmission points and given by multiplication of at least two matrices:
- a first matrix constructed from single point precoding matrices for the plurality of transmission points and an inter-point precoding matrix for the plurality of transmission points determined using predefined rules, wherein a rank of the multi-point precoding matrix is larger than one.
An apparatus comprising:
- a processing system comprising at least one processor and a memory storing a set of computer instructions, in which the processing system is arranged to cause the apparatus to:
- provide at least one feedback tracking signal by a receiving device engaged in a coordinated multi-point joint transmission involving links between a user equipment having multiple receive antennas and a plurality of transmission points,
- wherein the at least one feedback tracking signal comprises information for defining a multi-point precoding matrix for one multi-point link between the user equipment and the plurality of transmission points and given by multiplication of at least two matrices:
- a first matrix constructed from single point precoding matrices for the plurality of transmission points and an inter-point precoding matrix for the plurality of transmission points determined using predefined rules, wherein a rank of the multi-point precoding matrix is larger than one.
1 more element
Dependencies are inferred from the claim text.