Lattice reduction in wireless communication
AssigneeCohere Technologies, Inc.
InventorsVamadevan Namboodiri, Ronny Hadani, James Delfeld
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Abstract
Methods, systems and devices for lattice reduction in decision feedback equalizers for orthogonal time frequency space (OTFS) modulation are described. An exemplary wireless communication method, implementable by a wireless communication receiver apparatus, includes receiving a signal comprising information bits modulated using OTFS modulation scheme. Each delay-Doppler bin in the signal is modulated using a quadrature amplitude modulation (QAM) mapping. The method also includes estimating the information bits based on an inverse of a single error covariance matrix of the signal, with the single error covariance matrix being representative of an estimation error for all delay-Doppler bins in the signal.
Claims20
A wireless communication method, implementable by a wireless communication receiver apparatus, comprising:
- receiving a signal comprising information bits modulated using an orthogonal frequency division multiplexing (OFDM) modulation scheme, wherein each sub-carrier in the signal is modulated using a quadrature amplitude modulation (QAM) mapping;
- generating a single error covariance matrix that is an average of error covariance matrixes for the sub-carriers that are grouped according to estimated channel characteristics for the sub-carriers;
- and
- estimating the information bits based on an inverse of the single error covariance matrix of the signal, wherein the single error covariance matrix is representative of an estimation error for all sub-carriers in the signal.
A wireless communication device comprising a processor and transceiver circuitry wherein the transceiver circuitry is configured for receiving a signal comprising information bits modulated using an orthogonal frequency division multiplexing (OFDM) modulation scheme, wherein each sub-carrier is modulated using a quadrature amplitude modulation (QAM) mapping;
- and
- wherein the processor is configured to:
- generating a single error covariance matrix that is an average of error covariance matrixes for the sub-carriers that are grouped according to estimated channel characteristics for the sub-carriers;
- and
- estimate the information bits based on an inverse of the single error covariance matrix of the signal, wherein the single error covariance matrix is representative of an estimation error for all sub-carriers in the signal.
Dependencies are inferred from the claim text.