Power Line Communication Sub-band PSD Optimization
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Solution Overview
Problem
Current broadband powerline communication systems face challenges in increasing throughput while maintaining coverage and adhering to regulatory requirements, particularly due to severe power spectral density steps and high implementation costs associated with dynamic range, noise, and linearity requirements.
Innovation Solution
The system identifies sub-bands with higher maximum power spectral densities and reduces their power in a predetermined manner to improve overall quality, optimizing signal-to-noise ratios and throughput across multiple sub-bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the bandwidth is extended above 30MHz to increase throughput, then the data rate improves, but the implementation cost increases due to severe PSD steps requiring high dynamic range transmitters and receivers
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the power spectral density allocation across different frequency sub-bands. Instead of using a fixed high PSD above 30MHz, the system varies the PSD parameter to match channel conditions and regulatory requirements, allowing throughput optimization without requiring expensive high-dynamic-range hardware throughout the entire bandwidth.
Solution Approach 2:
The invention implements dynamics through adaptive power allocation that adjusts transmission parameters in real-time based on channel quality indicators. The system dynamically selects which sub-bands to use and at what power levels, rather than operating at fixed maximum power across all frequencies, thereby reducing hardware complexity while maintaining high throughput when conditions permit.
2Reliability
If the power spectral density is increased to improve signal quality and coverage, then the communication reliability improves, but the radiated emissions and interference with other devices increase
Solution Approach 1:
The patent applies local quality by allocating different power spectral density levels to different frequency sub-bands based on their individual channel characteristics and regulatory constraints. Instead of uniformly increasing power across all frequencies, the system identifies specific sub-bands where higher PSD can be used without causing excessive radiated emissions, thereby improving signal quality locally without worsening interference globally.
Solution Approach 2:
The invention segments the frequency spectrum into multiple sub-bands and applies different power allocation strategies to each segment. This allows the system to concentrate power in sub-bands with favorable propagation characteristics and lower radiated emission potential, while reducing or eliminating power in sub-bands that would cause interference, thus resolving the contradiction between reliability and harmful emissions.
3Manufacturing precision
If the dynamic range of transmitter and receiver is increased to handle PSD steps, then the signal integrity improves, but the quantization noise and linearity requirements increase implementation cost
Solution Approach 1:
The patent resolves this contradiction by changing the PSD parameter dynamically across sub-bands rather than maintaining a fixed wide dynamic range. By adapting the transmission power to match actual channel conditions in each sub-band, the system reduces the required dynamic range of transmitters and receivers, thereby lowering quantization noise and linearity requirements while maintaining sufficient signal integrity for reliable communication.
Data Source
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AI summary
The present invention relates to a communication system comprising a transmitter and receiver in communication for transmitting signals through one or more communications channels, wherein at least one of the transmitter and the receiver each comprise a quality measure, which contributes to an overall quality measure for the system and wherein the or each communications channel comprises a plurality of sub-bands between at least two nodes, wherein the plurality of sub-bands each having a specific maximum power spectral densities (PSDs) and wherein one or more sub-bands between the transmitter and the receiver are identified as having a higher maximum PSD than other sub-bandsand wherein the PSD of the one or more identified sub-bands is reduced in a predetermined manner to thereby increase the overall quality measure for the system.