Vectoring Power Control via Independent Subcarrier Gain Factors
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Solution Overview
Problem
The existing power control method in vectoring crosstalk cancellation systems is complex and reduces the signal transmission performance of entire lines due to the normalization and recovery factors applied to precoding and frequency domain equalizer matrices, which affects the control of transmit power and leads to weakened signals in lines with strong crosstalk.
Innovation Solution
A power control method that acquires and modifies power gain factors for each subcarrier, allowing independent control of each transmit end, ensuring that the modified power gain factor is within the specified limits without affecting other lines, thereby simplifying the power control process and maintaining signal strength across all lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a normalization factor λ is applied to the precoding matrix to control transmit power, then transmit power is controlled within limits, but the receive signal becomes distorted and requires a recovery factor 1/λ in the FEQ matrix, increasing system complexity
Solution Approach 1:
The patent extracts the power control function from the precoding matrix normalization approach and implements it through separate power control factors Diik for each transmit end. Instead of applying a global normalization factor λ to all transmit signals, the invention applies individual power control factors to each transmit end independently, eliminating the need for coordinated recovery factors in the FEQ matrix and reducing system complexity.
Solution Approach 2:
The patent segments the power control mechanism by introducing separate power control factors Diik for each transmit end i and each subcarrier k. This segmentation allows independent power control for each transmit end without requiring global normalization, thereby avoiding the complexity of coordinated normalization and recovery factor application across the entire system.
2Power
If all transmit signals are multiplied by a normalization factor λ to reduce power, then transmit power control is achieved, but signals in lines with strong crosstalk are weakened, reducing signal transmission performance
Solution Approach 1:
The patent applies local quality by introducing transmit-end-specific power control factors Diik that can be independently optimized for each transmit end i and subcarrier k. This allows lines with strong crosstalk to maintain higher power levels while lines with weak crosstalk use lower power, thereby maintaining signal transmission performance in critical lines while achieving overall power control.
Solution Approach 2:
The patent implements dynamic power control by allowing each power control factor Diik to be independently adjusted based on the specific crosstalk conditions of each transmit end and subcarrier. This dynamic adjustment enables the system to optimize power distribution in real-time, maintaining signal quality in lines with strong crosstalk while achieving power control objectives.
3Power
If a precoding matrix with normalization factor λ is used, then power control is achieved, but the FEQ matrix must also be adjusted with recovery factor 1/λ, making strict coordination complex
Solution Approach 1:
The patent extracts the power control function from the precoding matrix normalization approach and implements it through separate power control factors Diik for each transmit end. Instead of applying a global normalization factor λ to all transmit signals, the invention applies individual power control factors to each transmit end independently, eliminating the need for coordinated recovery factors in the FEQ matrix and reducing system complexity.
4Power
If uniform power control is applied to all transmit ends, then overall power limits are met, but individual lines with different crosstalk conditions cannot optimize their power levels, reducing overall system performance
Solution Approach 1:
The patent applies local quality by introducing transmit-end-specific power control factors Diik that can be independently optimized for each transmit end i and subcarrier k. This allows lines with strong crosstalk to maintain higher power levels while lines with weak crosstalk use lower power, thereby maintaining signal transmission performance in critical lines while achieving power control objectives.
Solution Approach 2:
The patent changes the power control parameters from a single global normalization factor to multiple transmit-end-specific factors Diik. This parameter change enables independent optimization of power levels for each transmit end based on their specific crosstalk conditions, thereby improving overall system performance while meeting power control requirements.
Data Source
AI summary
The present invention discloses a power control method, apparatus, and system. A vectoring control entity acquires a power control factor Diik of an ith transmit end on a kth subcarrier, where the ith transmit end is one transceiver of M transceivers located at a central office end, 1≤k≤K, and K indicates a quantity of subcarriers; and sends the power control factor Diik to the ith transmit end, so that if it is determined, according to the power control factor Diik, that the power control factor Diik is less than a power gain factor gik, of a current transmit signal of the ith transmit end, on the kth subcarrier, the ith transmit end modifies the power gain factor gik of the current transmit signal, so that a modified power gain factor g′ik is less than or equal to the power control factor Diik.