Network Codebook Design for MIMO Large Scale Fading
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Solution Overview
Problem
Current MIMO communication systems lack a clear definition for a network codebook that can be shared among multiple base stations, leading to inefficiencies in signal transmission due to large scale fading, which causes fluctuations in wireless signals across spatially separated networks.
Innovation Solution
A method for designing a network codebook that incorporates information on large scale fading, using a pre-defined first codebook and a concatenated codebook from multiple base stations, with diagonal elements and a matrix that weights values associated with fading, to enhance precoding and channel status feedback across multiple base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a codebook is designed for single base station MIMO systems, then the system complexity remains manageable, but the codebook cannot be shared across multiple base stations leading to signal loss from large scale fading
Solution Approach 1:
The patent merges codebooks from multiple base stations into a single network codebook that can be shared across the network. This is achieved by concatenating individual base station codebooks and applying processing based on large scale fading information, allowing the combined codebook to serve multiple base stations while maintaining reliability in spatially separated networks
Solution Approach 2:
The network codebook is designed to be universal and shareable across multiple base stations in the network. By incorporating large scale fading information and designing the codebook to work with multiple base stations simultaneously, the same codebook structure serves multiple functions and multiple base stations, reducing the need for separate codebooks at each location
2Area of stationary object
If base stations are spatially separated to expand network coverage, then the network coverage area increases, but large scale fading occurs causing signal fluctuations
Solution Approach 1:
The patent applies local quality by incorporating base station-specific large scale fading information into the codebook design. Each base station's fading characteristics are considered when designing its portion of the network codebook, allowing the codebook to be adapted to local channel conditions while maintaining overall network-wide compatibility and shareability
3Measurement precision
If individual codebooks are used at each base station, then the codebook can be optimized for local conditions, but the codebook cannot be shared leading to increased feedback overhead
Solution Approach 1:
The patent merges individual base station codebooks into a unified network codebook structure. This allows terminals to provide feedback relative to the network codebook rather than separate feedback for each base station, reducing feedback overhead while maintaining the ability to optimize for local channel conditions through the incorporated large scale fading information
Data Source
AI summary
Provided herein is a method of designing a network codebook that may be shared by a plurality of base stations. Also provided herein is a feedback method of a terminal using the network codebook. The network codebook design method may design the network codebook by processing a pre-defined first codebook based on large scale fading of the base stations. The terminal may more effectively feed back a preferred matrix indicator with respect to the network codebook.