FAST JOINT TRAFFIC-TO-PILOT RATIO AND SPATIAL SCHEME DETECTION
First Claim
1. A method for interference cancellation performed by a User Equipment (UE) in communication with a serving cell, the method comprising:
- determining a rank of an unprecoded channel matrix associated with an interfering cell;
estimating, based at least in part on the determined rank, a Traffic-to-Pilot Ratio (TPR) for an interfering transmission from the interfering cell over time and frequency resources associated with a serving cell transmission from the serving cell, wherein estimating the TPR of the interfering transmission is based at least in part on a unit-norm property of a plurality of precoding matrix hypotheses for the interfering transmission;
calculating, based at least in part on the estimated TPR for the interfering transmission, respective log-likelihood functions for joint demodulation of the serving cell transmission and the interfering transmission according to the plurality of precoding matrix hypotheses;
selecting a subset of the plurality of precoding matrix hypotheses based at least in part on the respective log-likelihood functions; and
performing joint demodulation of the serving cell transmission and the interfering transmission to obtain a set of demapped symbols for the serving cell transmission, the joint demodulation being based at least in part on a uniform distribution hypothesis for the serving cell transmission and a non-uniform distribution hypothesis for the interfering transmission.
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Accused Products
Abstract
Methods, systems, and devices for wireless communications are described. A wireless device such as a User Equipment (UE) in communication with a serving cell, may perform interference cancellation from an interfering cell. A UE may determine a rank of an unprecoded channel matrix associated with the interfering cell, estimate a traffic-to-pilot ratio (TPR) for an interfering transmission, based in part on a unit-norm property of a plurality of precoding matrix hypotheses for the interfering transmission, calculate respective log-likelihood functions for joint demodulation of the serving and interfering cell transmissions, select a subset of the plurality of precoding matrix hypotheses, and perform joint demodulation of the transmissions to obtain a set of demapped symbols, by assuming a uniform distribution hypothesis for the serving cell transmission, and a Gaussian distribution hypothesis for the interfering transmission.
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30 Claims
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1. A method for interference cancellation performed by a User Equipment (UE) in communication with a serving cell, the method comprising:
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determining a rank of an unprecoded channel matrix associated with an interfering cell; estimating, based at least in part on the determined rank, a Traffic-to-Pilot Ratio (TPR) for an interfering transmission from the interfering cell over time and frequency resources associated with a serving cell transmission from the serving cell, wherein estimating the TPR of the interfering transmission is based at least in part on a unit-norm property of a plurality of precoding matrix hypotheses for the interfering transmission; calculating, based at least in part on the estimated TPR for the interfering transmission, respective log-likelihood functions for joint demodulation of the serving cell transmission and the interfering transmission according to the plurality of precoding matrix hypotheses; selecting a subset of the plurality of precoding matrix hypotheses based at least in part on the respective log-likelihood functions; and performing joint demodulation of the serving cell transmission and the interfering transmission to obtain a set of demapped symbols for the serving cell transmission, the joint demodulation being based at least in part on a uniform distribution hypothesis for the serving cell transmission and a non-uniform distribution hypothesis for the interfering transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for interference cancellation performed by a User Equipment (UE) in communication with a serving cell, comprising:
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means for determining a rank of an unprecoded channel matrix associated with an interfering cell; means for estimating, based at least in part on the determined rank, a traffic-to-pilot Ratio (TPR) for an interfering transmission from the interfering cell over time and frequency resources associated with a serving cell transmission from the serving cell, wherein estimating the TPR of the interfering transmission is based at least in part on a unit-norm property of a plurality of precoding matrix hypotheses for the interfering transmission; means for calculating, based at least in part on the estimated TPR for the interfering transmission, respective log-likelihood functions for joint demodulation of the serving cell transmission and the interfering transmission according to the plurality of precoding matrix hypotheses; means for selecting a subset of the plurality of precoding matrix hypotheses based at least in part on the respective log-likelihood functions; and means for performing joint demodulation of the serving cell transmission and the interfering transmission to obtain a set of demapped symbols for the serving cell transmission, the joint demodulation being based at least in part on a uniform distribution hypothesis for the serving cell transmission and a non-uniform distribution hypothesis for the interfering transmission. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. An apparatus for interference cancellation performed by a User Equipment (UE) in communication with a serving cell, comprising a processor, memory in electronic communication with the processor, and instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
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determine a rank of an unprecoded channel matrix associated with an interfering cell; estimate, based at least in part on the determined rank, a traffic-to-pilot ratio (TPR) for an interfering transmission from the interfering cell over time and frequency resources associated with a serving cell transmission from the serving cell, wherein estimating the TPR of the interfering transmission is based at least in part on a unit-norm property of a plurality of precoding matrix hypotheses for the interfering transmission; calculate, based at least in part on the estimated TPR for the interfering transmission, respective log-likelihood functions for joint demodulation of the serving cell transmission and the interfering transmission according to the plurality of precoding matrix hypotheses; select a subset of the plurality of precoding matrix hypotheses based at least in part on the respective log-likelihood functions; and perform joint demodulation of the serving cell transmission and the interfering transmission to obtain a set of demapped symbols for the serving cell transmission, the joint demodulation being based at least in part on a uniform distribution hypothesis for the serving cell transmission and a non-uniform distribution hypothesis for the interfering transmission. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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30. A non-transitory computer-readable medium storing code for interference cancellation performed by a User Equipment (UE) in communication with a serving cell, the code comprising instructions executable by a processor to:
- determine a rank of an unprecoded channel matrix associated with an interfering cell;
estimate, based at least in part on the determined rank, a traffic-to-pilot ratio (TPR) for an interfering transmission from the interfering cell over time and frequency resources associated with a serving cell transmission from the serving cell, wherein estimating the TPR of the interfering transmission is based at least in part on a unit-norm property of a plurality of precoding matrix hypotheses for the interfering transmission; calculate, based at least in part on the estimated TPR for the interfering transmission, respective log-likelihood functions for joint demodulation of the serving cell transmission and the interfering transmission according to the plurality of precoding matrix hypotheses; select a subset of the plurality of precoding matrix hypotheses based at least in part on the respective log-likelihood functions; and perform joint demodulation of the serving cell transmission and the interfering transmission to obtain a set of demapped symbols for the serving cell transmission, the joint demodulation being based at least in part on a uniform distribution hypothesis for the serving cell transmission and a non-uniform distribution hypothesis for the interfering transmission.
- determine a rank of an unprecoded channel matrix associated with an interfering cell;
Specification