Modified Precoding Matrix for MIMO Power Variance Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing transmission power across multiple channels in MIMO communications, leading to non-linear operation of power amplifiers and reduced amplification levels, which affects signal quality and reliability.
Innovation Solution
The implementation of a modified precoding matrix is achieved by adding a product of a null space matrix and a redistribution matrix to the existing precoding matrix, allowing for reduced power variance across transmission channels and efficient power amplifier usage, avoiding non-linear operation while maintaining high amplification levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a precoding matrix is used to determine transmission parameters via multiple antenna elements, then signal beamforming and reception reliability are improved, but transmission power variance across channels increases causing power amplifier non-linear operation
Solution Approach 1:
The patent modifies the precoding matrix by adding a product of a null space matrix and a redistribution matrix to the original precoding matrix. This parameter change redistributes transmission power across channels to reduce variance, allowing power amplifiers to operate in linear regions while maintaining beamforming effectiveness for reliable signal reception.
2Reliability
If transmission power is increased to enhance signal quality, then communication reliability improves, but power amplifier non-linear operation occurs reducing amplification efficiency
Solution Approach 1:
The patent changes the precoding matrix parameters by incorporating a redistribution matrix that equalizes power across transmit chains. This allows the system to maintain high transmission power for reliable communication while ensuring power amplifiers operate efficiently in their linear regions, avoiding the trade-off between reliability and efficiency.
3Strength
If power amplifiers operate at high amplification levels to improve signal strength, then transmission quality improves, but non-linear operation occurs affecting signal fidelity
Solution Approach 1:
The patent modifies the precoding matrix to redistribute power uniformly across channels, enabling power amplifiers to operate at high amplification levels in their linear regions. This maintains both high signal strength for quality transmission and signal fidelity by avoiding non-linear distortion.
4Productivity
If a standard precoding matrix is used for MIMO communications, then multi-antenna transmission is enabled, but power variance across channels causes inefficient power amplifier usage
Solution Approach 1:
The patent changes the precoding matrix by adding a product of null space matrix and redistribution matrix to the standard precoding matrix. This modification maintains full MIMO transmission capability while redistributing power to ensure efficient power amplifier operation across all transmit chains.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described in which a base station may identify a null space matrix that lies within a null space of an effective channel matrix for communications between the base station and a user equipment (UE). An indication of the null space matrix may be provided to the UE, and the null space matrix used to determine modifications to a precoding matrix. The base station and UE may determine a redistribution matrix that provides a reduced variance of transmission powers for a number of transmission channels, where a product of the null space matrix and the redistribution matrix may be computed and added to the precoding matrix to generate a modified precoding matrix. The modified precoding matrix may be used to generate the communications from the base station and UE with reduced power variance across channels.