Power Line Communication Spectrum Allocation for Reliable Frames
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Solution Overview
Problem
Power line communication (PLC) reliability is affected by real-time changes in load impedance and noise interference due to the addition of electrical loads, leading to inconsistent channel quality and reduced communication efficiency.
Innovation Solution
A communication method where a receive end measures channel quality of frequency bands and feeds back information to the transmit end to increase the power spectrum density of frequency bands with good channel quality in a robust communication frame, using techniques like robust orthogonal frequency-division multiplexing (ROBO) and robust communication mode (RCM) to enhance transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If power line communication is used to transmit broadband data through existing power lines, then wide coverage area and no additional network line installation are achieved, but load impedance and noise interference change in real-time affecting communication reliability
Solution Approach 1:
The patent implements dynamic power spectrum density adjustment where the transmit end adapts power allocation based on real-time channel quality feedback from the receive end. Different frequency bands are assigned different power spectrum densities according to their channel conditions, allowing the system to dynamically respond to changing load impedance and noise interference while maintaining communication reliability across wide coverage areas
Solution Approach 2:
The patent changes the power spectrum density parameter of different frequency bands based on measured channel quality. By adjusting this key parameter dynamically rather than using uniform power distribution, the system optimizes communication reliability under varying power line conditions while maintaining wide coverage
2Device complexity
If uniform power spectrum density is used across all frequency bands, then implementation is simple, but communication reliability decreases when channel quality varies across frequency bands
Solution Approach 1:
The patent applies different power spectrum densities to different frequency bands based on their specific channel quality characteristics. Instead of uniform treatment, each frequency band receives customized power allocation according to its local channel conditions, improving overall communication reliability while the feedback mechanism keeps the implementation manageable
3Reliability
If power spectrum density is increased across all frequency bands to improve reliability, then communication reliability improves, but power consumption increases
Solution Approach 1:
The patent selectively increases power spectrum density only in frequency bands with good channel quality rather than uniformly across all bands. This targeted parameter adjustment improves communication reliability by concentrating power where it is most effective while avoiding unnecessary power consumption in bands with poor channel conditions
Solution Approach 2:
The patent applies differentiated power spectrum density allocation across different frequency bands based on their individual channel quality measurements. This localized quality optimization ensures power is consumed efficiently by targeting only the frequency bands that contribute most to reliable communication
Data Source
AI summary
A first communication apparatus sends a first communication frame to a second communication apparatus, where the first communication frame is used for channel quality measurement. The first communication apparatus receives a second communication frame from the second communication apparatus, where the second communication frame includes first indication information that indicates at least one frequency band whose power spectrum density is to be increased in a robust communication frame, or the first indication information indicates channel quality of at least one frequency band in a robust communication frame.