PLC Beamforming Optimization via DSL Leakage Measurement
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Solution Overview
Problem
Digital subscriber line (DSL) systems experience interference from power line communication (PLC) signals due to electromagnetic leakage, disrupting communications and requiring efficient methods to detect and mitigate impulse noise for improved interoperability.
Innovation Solution
A PLC device with sensors to detect signal leakage on DSL lines, adjusting transmission power or precoders based on detected leakage, utilizing common mode and differential mode ports to minimize interference and optimize coexistence with DSL systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PLC signals are transmitted on power lines, then PLC communication functionality is achieved, but electromagnetic interference is generated that disrupts DSL communications
Solution Approach 1:
The patent measures the harmful PLC signal leakage on DSL lines and uses this measurement information to optimize PLC beamforming precoders. The previously harmful interference becomes a useful measurement resource for improving PLC transmission efficiency and reducing future interference through adaptive precoder configuration.
Solution Approach 2:
The patent implements a feedback mechanism where PLC signal leakage is measured on DSL lines, and these measurements are provided to an arbiter that optimizes PLC device transmissions. The optimized precoders are then applied to reduce future interference, creating a closed-loop system that continuously improves coexistence between PLC and DSL systems.
2Loss of information
If impulse noise measurement is performed on DSL lines, then interference characterization is improved, but measurement precision is challenged by the need to distinguish PLC packets from other impulse noise sources
Solution Approach 1:
The patent uses PLC sound packets as measurement probes that are deliberately transmitted and then detected on DSL lines. By knowing the exact transmitted PLC packets, the system can correlate and identify their leakage signatures, distinguishing them from other impulse noise sources through pattern matching rather than simple threshold detection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces PLC signal leakage into DSL lines, enhancing communication efficiency and interoperability by independently characterizing and mitigating interference through precise power adjustments and precoder configurations.
Implementation Method 1
PLC signals carried on the power lines may create electromagnetic interference, resulting in impulse noise received on the twisted pair of a collocated DSL system
Data Source
AI summary
This disclosure provides systems, methods, and apparatus for wireline communication. Independent control of probing signals transmitted on different power line couplings may be used to characterize power line communication (PLC) signal leakage on a set of digital subscriber line (DSL) lines. For example, PLC packets may be sent on a primary coupling and an alternate coupling, and PLC signal leakage from these couplings may be measured by a device, such as a PLC device or a DSL device, connected to the set of DSL lines. The measurements from each coupling may enable a determination as to which of the couplings (either primary or alternate) is more imbalanced and results in relatively more PLC signal leakage into the set of DSL lines. Accordingly, a transmission power and a precoder may be determined based on the measured PLC signal leakage to mitigate interference on the twisted pair.