Multi-resolution precoding codebook
AssigneeNEC Laboratories America, Inc.
InventorsMohammad Ali Khojastepour, Xiaodong Wang
Life of this patent
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Abstract
Systems and methods are for generating a codebook by: generating a multi-resolution codebook by selecting a common precoder index from a low resolution codebook for a group of adjacent resource blocks (RB)s and for each RB within the group, selecting a high-resolution codebook to fine-tune each RB precoder; and generating feedback for the multi-resolution codebook by quantizing channel state variations.
Claims18
A method implemented in a base station used in a wireless communications system for precoding data, comprising:
- receiving from a user equipment a low resolution precoder index that is common to a group of resource blocks (RBs);
- receiving from the user equipment a high resolution precoder index for a resource block within the group of RBs;
- and
- determining a precoder using a multi-resolution codebook according to the low resolution precoder index and he high resolution precoder index.
A method implemented in a user equipment used in a wireless communications system for precoding data, comprising:
- transmitting to a base station a low resolution precoder index that is common to a group of resource blocks (RBs);
- transmitting to the base station a high resolution precoder index for a resource block within the group of RBs;
- and
- receiving data precoded with a precoder from the base station,
- wherein the precoder is determined using a multi-resolution codebook according to the low resolution precoder index and the high resolution precoder index.
A method implemented in a wireless communications system for precoding data, comprising:
- transmitting from a user equipment to a base station a low resolution precoder index that is common to a group of resource blocks (RBs);
- transmitting from the user equipment to the base station a high resolution precoder index for a resource block within the group of RBs;
- and
- transmitting data precoded with a precoder from the base station to the user equipment,
- wherein the precoder is determined using a multi-resolution codebook according to the low resolution precoder index and the high resolution precoder index.
Dependencies are inferred from the claim text.