DSL Spectrum Optimization via Power Budget Parameter Changes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current Dynamic Spectrum Management (DSM) technologies face difficulties in converging rate weighted coefficients, leading to challenges in optimizing subscriber line rates while reducing cross-talk and power loss in DSL systems.
Innovation Solution
A spectrum optimization method that calculates optimized transmission power using a benefit-cost ratio matrix, adjusting subcarrier power to maximize bit loading while minimizing interference, with a reference DSL line to reduce arithmetic complexity and iteratively update transmission rates to achieve target rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If Dynamic Spectrum Management (DSM) technology is used to reduce cross-talk by adjusting transmission power, then cross-talk influence is reduced, but it is difficult to converge rate weighted coefficients and optimize subscriber line rates effectively
Solution Approach 1:
The patent transforms the difficult-to-converge rate weighted coefficient optimization into a power budget parameter optimization problem. By changing the optimization parameter from rate weighted coefficients to available power budget per subcarrier, the system achieves easier convergence while still optimizing subscriber line rates and reducing cross-talk effectively.
Solution Approach 2:
The patent introduces an intermediary variable - the available power budget - that mediates between the transmission power adjustment and the rate optimization. This intermediary simplifies the optimization process by providing a direct relationship between power allocation and rate performance, avoiding the complex iterative search for rate weighted coefficients.
2Productivity
If transmission power is increased to improve subscriber line rates, then rates are improved, but power loss to other subscriber lines and cross-talk increases
Solution Approach 1:
The patent applies local quality by allocating different available power budgets to different subcarriers based on their specific channel conditions and interference characteristics. Each subcarrier's power budget is optimized locally to achieve the best rate while minimizing interference to other lines, rather than using a uniform power allocation approach.
Solution Approach 2:
The patent uses partial action by allocating power budgets that are sufficient to achieve target rates but not excessive. The available power budget is carefully calculated to provide just enough power for each subcarrier to meet performance targets while avoiding unnecessary power that would increase interference and energy loss to other subscriber lines.
3Productivity
If rate weighted coefficients are adjusted to optimize target rates, then rate optimization is achieved, but the extensive variation range makes convergence difficult and time-consuming
Solution Approach 1:
The patent changes the optimization parameter from rate weighted coefficients with extensive variation ranges to available power budget parameters with more constrained and physically meaningful ranges. This parameter transformation enables faster convergence because the power budget parameters have direct relationships with transmission physics and require fewer iterations to optimize.
Data Source
Figure 1~2
Figure 3~4
AI summary
The embodiments of the present invention disclose a spectrum optimization method and device and digital subscriber line system, the method comprising: calculating according to acquired information of each of respective subcarriers on the DSL line to be optimized to obtain optimized transmission power of a subcarrier to be optimized in a DSL line to be optimized; calculating a transmission rate of the DSL line to be optimized according to the optimized transmission power; and comparing the transmission rate with a target rate of the DSL line to be optimized, and if the transmission rate is less than the target rate, updating the information of an optimized subcarrier, and performing a recalculation. The embodiments of the present invention can overcome the problem of the prior art that it is difficult to converge the rate weighted coefficient, and improve the rate of a given subscriber line while reduce power loss caused by the given subscriber line to other subscriber lines in the same bundle of cables.