Hybrid Precoding System for Mixed CPE Interoperability
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Solution Overview
Problem
Existing communication systems face challenges in effectively mitigating crosstalk interference in multi-user communications, particularly when the number of transmitters differs from the number of active receivers, as they struggle to seamlessly integrate linear and nonlinear precoding schemes to support various customer premises equipment (CPE) units with different precoding capabilities.
Innovation Solution
A hybrid precoding system and method that determines a precoding scheme based on the supportabilities of receivers, applying reversible mappings and regularized generalized inversion of the communication channel matrix, allowing for the use of either linear or nonlinear precoding, and adapting the symbol space size for nonlinear precoding, to ensure effective data transmission across multiple communication channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If linear precoding is used to eliminate crosstalk, then crosstalk cancellation is improved, but power consumption increases and bitrate is diminished due to gain equalization requirements
Solution Approach 1:
The patent changes the parameter of precoding type from purely linear to a hybrid approach, incorporating nonlinear precoding for selected users. This parameter change allows the system to avoid the gain equalization requirement of linear precoding for nonlinearly precoded users, thereby reducing power consumption while maintaining crosstalk cancellation effectiveness.
2Use of energy by moving object
If nonlinear precoding is used to reduce power consumption, then power efficiency is improved, but compatibility with legacy equipment is lost
Solution Approach 1:
The patent segments the user base into different groups: some users receive linear precoding while others receive nonlinear precoding. This segmentation allows the system to provide power-efficient nonlinear precoding to capable users while maintaining compatibility with legacy equipment through linear precoding for other users, thus resolving the compatibility issue.
Solution Approach 2:
The system dynamically selects which users receive linear versus nonlinear precoding based on their capabilities and channel conditions. This dynamic adaptation allows the system to optimize power consumption for each user individually while ensuring overall system compatibility and versatility.
3Adaptability or versatility
If hybrid precoding is used to support mixed CPE capabilities, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent segments users into linear and nonlinear precoding groups, which simplifies the overall system architecture compared to a fully hybrid approach. Each group can be processed independently with dedicated precoding algorithms, reducing the complexity burden that would arise from managing a completely unified hybrid precoding system.
4Adaptability or versatility
If the number of transmitters differs from the number of active receivers, then system flexibility is improved, but precoding scheme integration becomes difficult
Solution Approach 1:
The patent employs dynamic user grouping and selection algorithms that adapt to the actual number of active transmitters and receivers. This dynamic approach allows the system to seamlessly integrate linear and nonlinear precoding schemes regardless of whether the number of transmitters equals the number of active receivers, maintaining system flexibility while managing integration complexity through adaptive resource allocation.
Data Source
AI summary
A method for precoding an information symbol conveying data for transmission between a plurality of transmitters and a plurality of receivers via a plurality of communication channels over a subcarrier frequency, the number of transmitters (N) is different than the number of active receivers (K) for that subcarrier frequency, the method comprising: receiving by said transmitters information pertaining to supportabilities of said receivers to decode non-linearly precoded data; determining a precoding scheme defining for which of said receivers said data to be transmitted by said transmitters shall be precoded using at least one of linear precoding and non-linear precoding, according to said supportabilities; constructing a signal by applying a reversible mapping to said information symbol, said reversible mapping includes elements each respectively associated with a particular one of said receivers, such that those said receivers supporting the decoding of said non-linearly precoded data are capable of reversing said reversible mapping to said information symbol, while for those said receivers not supporting the decoding of said non-linearly precoded data said information symbol is unaffected by said reversible mapping; constructing a precoder characterized by N≠K such that said precoder is configured to perform regularized generalized inversion of a communication channel matrix.