TECHNIQUES FOR CHANNEL ESTIMATION USING USER EQUIPMENT SPECIFIC REFERENCE SIGNALS BASED ON SMOOTHED PRECODERS IN A FREQUENCY DOMAIN
First Claim
1. A method of wireless communication comprising:
- identifying a plurality of intermediate precoders corresponding to a first plurality of tone subsets, the plurality of intermediate precoders defining a plurality of vectors across the first plurality of tone subsets, wherein each of the plurality of vectors comprises at least frequency domain components and non-frequency domain components;
selecting, for each vector of the plurality of vectors, a subset of the non-frequency domain components of the vector;
modifying the plurality of intermediate precoders to a plurality of smoothed precoders corresponding to a second plurality of tone subsets based at least in part on the selected subset of non-frequency domain components for each vector, wherein the plurality of smoothed precoders is smoothed in a frequency domain compared to the plurality of intermediate precoders; and
precoding a plurality of transmit streams using the plurality of smoothed precoders, wherein one or more of the plurality of transmit streams comprise a bandwidth allocation having one or more user equipment (UE)-specific reference signal tone locations uniformly spaced within the bandwidth allocation, the bandwidth allocation comprising a plurality of resource blocks (RBs) that are contiguous in frequency over the bandwidth allocation.
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Abstract
Methods, systems, and devices for wireless communication are described. One method includes identifying a plurality of intermediate precoders corresponding to a plurality of tone subsets. The plurality of intermediate precoders define a plurality of vectors across the plurality of tone subsets. The method further includes selecting, for each vector of the plurality of vectors, a subset of non-frequency domain components of the vector, such as time-domain components; modifying the plurality of intermediate precoders to a plurality of smoothed precoders based at least in part on the selected subset of non-frequency domain components for each vector; and precoding a plurality of transmit streams using the plurality of smoothed precoders. The plurality of smoothed precoders is smoothed in a frequency domain compared to the plurality of intermediate precoders. Smoothing precoders may enable application of wideband channel estimation techniques using user equipment (UE)-specific reference signals.
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Citations
30 Claims
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1. A method of wireless communication comprising:
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identifying a plurality of intermediate precoders corresponding to a first plurality of tone subsets, the plurality of intermediate precoders defining a plurality of vectors across the first plurality of tone subsets, wherein each of the plurality of vectors comprises at least frequency domain components and non-frequency domain components; selecting, for each vector of the plurality of vectors, a subset of the non-frequency domain components of the vector; modifying the plurality of intermediate precoders to a plurality of smoothed precoders corresponding to a second plurality of tone subsets based at least in part on the selected subset of non-frequency domain components for each vector, wherein the plurality of smoothed precoders is smoothed in a frequency domain compared to the plurality of intermediate precoders; and precoding a plurality of transmit streams using the plurality of smoothed precoders, wherein one or more of the plurality of transmit streams comprise a bandwidth allocation having one or more user equipment (UE)-specific reference signal tone locations uniformly spaced within the bandwidth allocation, the bandwidth allocation comprising a plurality of resource blocks (RBs) that are contiguous in frequency over the bandwidth allocation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for wireless communication comprising:
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means for identifying a plurality of intermediate precoders corresponding to a first plurality of tone subsets, the plurality of intermediate precoders defining a plurality of vectors across the first plurality of tone subsets, wherein each of the plurality of vectors comprises at least frequency domain components and non-frequency domain components; means for selecting, for each vector of the plurality of vectors, a subset of the non-frequency domain components of the vector; means for modifying the plurality of intermediate precoders to a plurality of smoothed precoders corresponding to a second plurality of tone subsets based at least in part on the selected subset of non-frequency domain components for each vector, wherein the plurality of smoothed precoders is smoothed in a frequency domain compared to the plurality of intermediate precoders; and means for precoding a plurality of transmit streams using the plurality of smoothed precoders, wherein one or more of the plurality of transmit streams comprise a bandwidth allocation having one or more user equipment (UE)-specific reference signal tone locations uniformly spaced within the bandwidth allocation, the bandwidth allocation comprising a plurality of resource blocks (RBs) that are contiguous in frequency over the bandwidth allocation. - View Dependent Claims (18, 19, 20, 21, 22)
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23. An apparatus for wireless communication, comprising:
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a processor; memory in electronic communication with the processor; and the processor and memory configured to; identify a plurality of intermediate precoders corresponding to a first plurality of tone subsets, the plurality of intermediate precoders defining a plurality of vectors across the first plurality of tone subsets, wherein each of the plurality of vectors comprises at least frequency domain components and non-frequency domain components; select, for each vector of the plurality of vectors, a subset of the non-frequency domain components of the vector; modify the plurality of intermediate precoders to a plurality of smoothed precoders corresponding to a second plurality of tone subsets based at least in part on the selected subset of non-frequency domain components for each vector, wherein the plurality of smoothed precoders is smoothed in a frequency domain compared to the plurality of intermediate precoders; and precode a plurality of transmit streams using the plurality of smoothed precoders, wherein one or more of the plurality of transmit streams comprise a bandwidth allocation having one or more user equipment (UE)-specific reference signal tone locations uniformly spaced within the bandwidth allocation, the bandwidth allocation comprising a plurality of resource blocks (RBs) that are contiguous in frequency over the bandwidth allocation. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable to:
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identify a plurality of intermediate precoders corresponding to a first plurality of tone subsets, the plurality of intermediate precoders defining a plurality of vectors across the first plurality of tone subsets, wherein each of the plurality of vectors comprises at least frequency domain components and non-frequency domain components; select, for each vector of the plurality of vectors, a subset of the non-frequency domain components of the vector; modify the plurality of intermediate precoders to a plurality of smoothed precoders corresponding to a second plurality of tone subsets based at least in part on the selected subset of non-frequency domain components for each vector, wherein the plurality of smoothed precoders is smoothed in a frequency domain compared to the plurality of intermediate precoders; and precode a plurality of transmit streams using the plurality of smoothed precoders, wherein one or more of the plurality of transmit streams comprise a bandwidth allocation having one or more user equipment (UE)-specific reference signal tone locations uniformly spaced within the bandwidth allocation, the bandwidth allocation comprising a plurality of resource blocks (RBs) that are contiguous in frequency over the bandwidth allocation.
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Specification