Codebook Generation for Multiple Antenna Systems
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Solution Overview
Problem
The existing codebook-based precoding scheme faces difficulties in efficiently applying to multiple antenna systems with an increased number of antennas, leading to increased overhead in feedback data and challenges in designing larger codebooks.
Innovation Solution
A method is proposed where a second codebook for multiple transmission antennas is generated from a first codebook by combining precoding matrices, allowing efficient precoding and reducing system complexity, while maintaining backward compatibility with existing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of transmission antennas is increased to improve data transfer rate, then the data transfer rate is improved, but the overhead of feedback data increases and codebook design becomes more difficult
Solution Approach 1:
The codebook for multiple transmission antennas is segmented into multiple groups, where each group corresponds to a subset of transmission antennas. This allows the codebook to be organized in a structured manner, making it easier to manage and design for systems with increased numbers of antennas without requiring a completely new codebook structure.
Solution Approach 2:
The codebook structure employs nesting by organizing codebook groups hierarchically, where codebook groups for different numbers of transmission antennas are nested within a unified framework. This enables efficient reuse of codebook structures across different antenna configurations, reducing design complexity while supporting increased antenna counts for higher data transfer rates.
2Adaptability or versatility
If the number of codebook sets is increased to support increased number of antennas, then the adaptability to multiple antenna systems is improved, but the overhead of feedback data increases
Solution Approach 1:
The codebook groups are designed to be universal and applicable to multiple antenna configurations. A single codebook group can serve multiple transmission antenna scenarios, reducing the need for separate codebook sets for each antenna number. This multi-functionality maintains adaptability across different system configurations while minimizing feedback overhead.
Solution Approach 2:
The system utilizes parameter changes by configuring codebook groups based on the number of transmission antennas. Rather than creating entirely separate codebooks for different antenna counts, the system adjusts parameters within a unified codebook structure, allowing efficient adaptation to different antenna configurations with minimal feedback information exchange.
Data Source
AI summary
A method of sending data in a multiple antenna system according to an aspect of the present invention includes performing precoding on received symbols based on a second codebook generated from a first codebook for a plurality of transmission antennas and sending the precoded symbols. The second codebook is a codebook for transmission antennas which are a multiple of an integer of the plurality of transmission antennas, and a precoding matrix included in the second codebook is generated by a combination of precoding matrices included in the first codebook.