Distributed Antenna System Precoding Matrix Selection
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Solution Overview
Problem
Current Distributed Antenna Systems (DAS) lack an efficient method for constructing a codebook and selecting the best precoding matrix for wireless communication, particularly in managing UE-specific antennas and optimizing power allocation across multiple antennas.
Innovation Solution
A method for constructing a DAS codebook using a conventional codebook, where control information about the number of UE-specific antennas is shared between the UE and the BS, allowing for the selection of a precoding matrix that optimizes signal transmission and minimizes interference by varying power allocation ratios based on antenna location and channel state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional codebook is used for DAS, then compatibility with existing systems is maintained, but the codebook construction and precoding matrix selection efficiency is insufficient
Solution Approach 1:
The codebook is segmented into multiple sub-codebooks, each corresponding to different antenna configurations and power allocation scenarios. This allows the system to select appropriate sub-codebooks based on current channel conditions and UE-specific requirements, improving efficiency while maintaining overall system compatibility
Solution Approach 2:
The codebook structure is made dynamic through configurable parameters that allow adaptation to different DAS configurations. The precoding matrix selection process dynamically adjusts based on channel state information and power allocation ratios, enabling efficient operation without sacrificing compatibility with conventional systems
2Reliability
If UE-specific antenna information is shared between UE and BS, then the best precoding matrix can be selected, but the system complexity increases
Solution Approach 1:
UE-specific antenna information and power allocation ratios are determined in advance by the BS based on channel conditions. This preliminary action allows the UE to pre-configure its receiving antennas and the BS to pre-select appropriate precoding matrices, reducing real-time complexity while maintaining high transmission quality
Solution Approach 2:
The patent introduces an intermediary signaling mechanism that efficiently conveys essential antenna configuration information between UE and BS. This intermediary approach selectively shares only the most critical parameters needed for precoding matrix selection, reducing information overhead while maintaining system performance
3Object-generated harmful factors
If power allocation ratios are optimized based on antenna location and channel state, then interference is reduced, but the computational complexity increases
Solution Approach 1:
Power allocation is optimized locally for each antenna based on its specific location and channel conditions to the UE. Each antenna's power allocation ratio is independently determined according to local interference conditions and channel quality, reducing overall interference without requiring complex global optimization
Solution Approach 2:
The system changes power allocation parameters dynamically based on channel state information and antenna characteristics. By adjusting power allocation ratios as configurable parameters, the system adapts to different interference scenarios and channel conditions, reducing harmful interference through parameter optimization rather than complex computational methods
Data Source
AI summary
The present invention relates to a method for a random terminal to receive a signal from a base station in a distributed antenna system (DAS), and more specifically, to a method for a terminal for receiving a signal from a base station, comprising: selecting a precoding matrix corresponding to a terminal-specific, numbered antenna from a codebook for the DAS, which is based on control information about the terminal-specific antenna to be used for communication with the terminal from among a plurality of antennas which includes antennas that are isolated from each other by a predetermined distance; and processing the received signal by using the selected precoding matrix.