MIMO Pre-coding Transform Matrix for Scattering Environments
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Solution Overview
Problem
Conventional MIMO wireless communication systems face limitations in accurately accounting for varying antenna configurations and scattering environments, leading to suboptimal pre-coding matrices that increase cross-antenna interference and reduce pre-coding gain due to overhead constraints and assumptions of standard antenna configurations and non-scattering environments.
Innovation Solution
The introduction of transform matrices that convert channel matrices from actual antenna configurations and scattering environments to standard configurations, allowing the use of pre-coding matrices from standardized codebooks, thereby optimizing signal transmission and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional pre-coding matrices from standardized codebooks are used, then device complexity is reduced and ease of operation is improved, but manufacturing precision deteriorates because the pre-coding matrices cannot accurately account for actual antenna configurations and scattering environments
Solution Approach 1:
The patent introduces transform matrices as an intermediary component that bridges the gap between standardized pre-coding codebooks and actual channel conditions. The transform matrix converts the standardized pre-coding matrix into a customized pre-coding matrix that accounts for specific antenna configurations and scattering environments, thereby maintaining ease of operation while improving pre-coding precision
Solution Approach 2:
The patent changes the parameters of the pre-coding matrix by applying transform matrices that are specific to each antenna configuration and scattering environment. This allows the system to adapt the standardized pre-coding matrices to actual channel conditions by modifying their parameters (transform matrices) rather than changing the entire pre-coding approach
2Manufacturing precision
If transform matrices are introduced to convert channel matrices for actual antenna configurations, then pre-coding precision is improved, but device complexity increases due to additional matrix transformations
Solution Approach 1:
The patent applies transform matrices in advance to convert standardized pre-coding matrices into customized pre-coding matrices before actual signal transmission. This preliminary transformation ensures that the pre-coding is optimized for specific antenna configurations and scattering environments without adding complexity during real-time operation
Solution Approach 2:
The transform matrices serve multiple functions: they adapt standardized pre-coding matrices to different antenna configurations, account for scattering environments, and maintain compatibility with existing codebook structures. This multi-functionality reduces the need for separate solutions for each scenario
3Ease of manufacture
If standardized codebooks for specific antenna configurations are used, then ease of manufacture is improved, but adaptability deteriorates because the codebooks cannot accommodate varying antenna configurations and environmental conditions
Solution Approach 1:
The patent enables adaptability by changing the parameters of standardized pre-coding matrices through transform matrices that are specific to each antenna configuration and scattering environment. This allows the system to maintain ease of manufacture using standardized codebooks while achieving adaptability to varying conditions through parameter transformation
Data Source
AI summary
The present invention provides a method of transforming pre-coded signals for transmission over an air interface in a MIMO wireless communication system. Embodiments of the method may include applying, at a transmitter, a transform matrix and a pre-coding matrix to a signal prior to transmitting the signal using a plurality of antennas deployed in a first antenna configuration. The pre-coding matrix is selected from a codebook defined for a second antenna configuration deployed in a non-scattering environment. The transform matrix is defined based on the first antenna configuration and a scattering environment associated with the transmitter.