Multicarrier Communication via SN-Ratio and Balancing Measurement
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Solution Overview
Problem
In multicarrier communication systems using power lines, existing technologies face challenges in selecting carriers and modulation methods to maximize information transmission efficiency while minimizing unwanted radiated emission, particularly in indoor power line environments where SN-ratios and balancing are critical.
Innovation Solution
A method and system for multicarrier communication that measures the balancing and SN-ratio of power lines to dynamically control communication modes, including carrier selection, power control, and modulation method choice, to optimize carrier usage and reduce unwanted radiated emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carriers with higher multivalues (64QAM, 16QAM) are selected to increase information transmission efficiency, then productivity is improved, but the SN-ratio requirement increases leading to greater transmission power consumption
Solution Approach 1:
The patent applies local quality by selecting different modulation methods for different carriers based on their individual SN-ratios. Carriers with higher SN-ratios use higher-order modulation (64QAM, 16QAM) for greater efficiency, while carriers with lower SN-ratios use lower-order modulation (QPSK, BPSK) to maintain reliability. This localized optimization resolves the contradiction by matching transmission efficiency to actual channel conditions rather than using a uniform approach across all carriers.
Solution Approach 2:
The patent implements dynamics through channel estimation and adaptive modulation. The system dynamically determines the SN-ratio for each carrier through channel estimation, then adaptively selects the appropriate modulation method based on these measured conditions. This dynamic adaptation allows the system to optimize information transmission efficiency while consuming only the necessary transmission power for each specific carrier condition.
2Productivity
If transmission power is increased to improve SN-ratio and enable higher-order modulation, then productivity is improved, but unwanted radiated emission increases causing harmful effects
Solution Approach 1:
The patent applies local quality by controlling transmission power on a per-carrier basis rather than uniformly across all carriers. Each carrier's transmission power is optimized according to its specific SN-ratio requirements, enabling higher-order modulation only where sufficient SN-ratio exists without unnecessarily increasing power for carriers that don't require it. This localized power control resolves the contradiction by achieving necessary transmission efficiency while minimizing overall radiated emission.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting modulation order and transmission power based on measured SN-ratios. When SN-ratio conditions permit, the system transitions to higher-order modulation with corresponding power adjustments. When conditions are poor, it transitions to lower-order modulation with reduced power requirements. This parameter adaptation resolves the contradiction by matching transmission parameters to actual channel capabilities.
3Productivity
If channel estimation is performed to optimize carrier selection and modulation methods, then productivity is improved, but device complexity increases due to additional measurement and control functions
Solution Approach 1:
The patent applies universality by implementing channel estimation and SN-ratio measurement functions that serve multiple purposes simultaneously. The same measurement infrastructure supports carrier selection, modulation method determination, and transmission power control. This multi-functional approach resolves the contradiction by achieving high transmission efficiency through comprehensive channel knowledge while avoiding the complexity of separate dedicated systems for each function.
Solution Approach 2:
The patent implements preliminary action by performing channel estimation and SN-ratio measurement before actual data transmission. This preliminary characterization of the channel conditions enables optimal carrier and modulation selection in advance, avoiding the need for complex real-time adjustments during transmission. The preliminary action resolves the contradiction by establishing transmission parameters based on measured conditions, achieving high efficiency without continuous complex control.
Data Source
AI summary
A multicarrier communication method selects carriers on the basis of an SN-ratio and the balancing of a transmission line. Available carriers are selected in accordance with the balancing of the balanced transmission line, in which the balancing is measured at either a sending terminal or a receiving terminal or alternatively at both, and the SN-ratio is measured between the sending terminal and the receiving terminal. Additionally, a modulation method having the greatest permissible multivalue is selected for each of the carriers, wherein the carriers are selected in light of the SN-ratio and balancing, or alternatively in a highest-to-lowest order of frequency. Transmission power is controlled for each of the carriers to suppress radiated emission, and the SN-ratio and balancing are measured at predetermined time intervals to renew the selection of the carriers and the selection of the modulation methods.