Vectoring Power Control via Subcarrier Closure
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Solution Overview
Problem
In vectoring systems, the inversion of channel matrices with poor condition numbers leads to excessively large element values in cancellation matrices, resulting in inefficient power control and reduced transmission rates due to excessive scaling of transmit signals.
Innovation Solution
A method for power control in vectoring systems that involves calculating a closed subcarrier set based on line crosstalk channel information, where subcarriers with high crosstalk coefficients are identified and removed to reduce interference, allowing for more efficient power allocation and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inversion is performed on a channel matrix with poor condition number to obtain a cancellation matrix, then crosstalk cancellation is achieved, but element values in the cancellation matrix become excessively large, causing excessive scaling of transmit signals and reducing transmission rates
Solution Approach 1:
The patent changes the parameter of the cancellation matrix by applying element-wise clipping to constrain element values within a specific range. This prevents excessively large values while maintaining the matrix's crosstalk cancellation function, thereby resolving the contradiction between reliable cancellation and high transmission rates
Solution Approach 2:
Instead of using the complete inverted cancellation matrix, the patent applies partial action by selectively modifying only the excessive elements through clipping. This partial modification maintains the essential cancellation functionality while eliminating the harmful effect of excessively large values that reduce transmission rates
2Object-generated harmful factors
If power control is implemented by scaling transmit signals using diagonal matrix elements, then interference to other signals is reduced, but the scaling factor becomes excessively large due to small diagonal elements, greatly affecting sending rates
Solution Approach 1:
The patent modifies the diagonal elements of the power control matrix by applying clipping to constrain them within a specific range. This prevents excessively large scaling factors while maintaining the interference reduction function, thereby resolving the contradiction between reducing harmful interference and maintaining high sending rates
Data Source
AI summary
Embodiments of the present invention provide a power control method, device, and system, and relate to the field of communications technologies. The method is applied to a vectoring system, where the vectoring system includes multiple lines, each line includes multiple subcarriers, and for each subcarrier, a crosstalk channel is formed between the multiple lines, and the method includes: obtaining a closed subcarrier set of the multiple lines according to line crosstalk channel information corresponding to each subcarrier of the multiple subcarriers, where the closed subcarrier set includes a subcarrier set required to be closed on the multiple lines; and sending the closed subcarrier set of the multiple lines to a transceiver, and closing, by the transceiver, a transmit signal on a subcarrier required to be closed on each line.