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US 8,199,836 B2Granted
Multi-resolution precoding codebook
AssigneeNEC Laboratories America, Inc.
InventorsMohammad Ali Khojastepour, Xiaodong Wang
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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.
Claims26
A method implemented in a wireless communications system for generating a codebook, comprising:
- having a multi-resolution codebook including codebooks that successively add to the codebook resolution;
- using the multi-resolution codebook to perform feedback based precoding by selecting a common precoder index from a low resolution codebook for a group of adjacent resource blocks (RBs);
- for each RB within the group, selecting an index from a high-resolution codebook to fine-tune each RB precoder;
- and
- generating feedback based on the multi-resolution codebook by quantizing variations in a wireless channel.
2 more elements
A communication system, comprising:
- a base station having a processor adapted to use a multi-resolution codebook by selecting a common precoder index from a low resolution codebook for a group of adjacent resource blocks (RBs) and for each RB within the group, and selecting a high-resolution codebook to fine-tune each RB precoder;
- and
- one or more wireless devices generating feedback for the multi-resolution codebook by quantizing state variations in a channel, and communicating with the base station using the multi-resolution codebook.
A multi-resolution codebook precoding process, comprising:
- generating low resolution codebook(s);
- generating high resolution codebook(s) based on the low resolution codebook(s);
- determining a common precoder index from the low resolution codebook(s) suitable for all RBs in each group;
- for each RB, determining individual indices from the high resolution codebook(s) based on the common precoder index from the low resolution codebook(s);
- generating feedback signals by gathering all indices;
- and
- performing precoding at a base station by regenerating a target precoder using the feedback signals.
4 more elements
Dependencies are inferred from the claim text.