DSL Precoding Parameter Synchronization for Crosstalk Reduction
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Solution Overview
Problem
In digital subscriber line (DSL) systems, far-end crosstalk interference (FEXT) significantly reduces channel rates, leading to unstable performance and low service-enabling rates due to power limitations in downlink precoding, necessitating synchronous adjustment of parameters between sending and receiving devices to minimize bit errors.
Innovation Solution
A method for synchronously adjusting precoding and signal recovery parameters between sending and receiving devices, including acquiring new precoding and signal recovery parameters, and coordinating their use to ensure correct power management and signal integrity, thereby reducing bit error rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downlink precoding is used to reduce FEXT interference, then channel rate is improved, but power limitations cause performance instability and low service-enabling rates
Solution Approach 1:
The patent dynamically adjusts precoding parameters (precoding matrix indicator PMI, rank indicator RI) and power allocation parameters based on channel conditions and interference levels. By changing these parameters adaptively, the system optimizes the trade-off between achieving high channel rates through precoding and maintaining stable performance within power limitations.
Solution Approach 2:
The system implements dynamic parameter adjustment where precoding matrices and power allocation are not fixed but adapt in real-time based on channel state information, interference measurements, and service requirements. This dynamic approach allows the system to maintain optimal performance across varying conditions while respecting power constraints.
2Reliability
If precoding parameters are adjusted to optimize transmission, then signal quality is improved, but synchronization between sending and receiving devices becomes complex
Solution Approach 1:
The patent implements feedback mechanisms where the receiving device sends acknowledgments and channel state information back to the sending device. This feedback loop enables coordinated parameter adjustment, ensuring that precoding changes at the transmitter are matched by corresponding recovery parameter changes at the receiver, maintaining signal quality while managing coordination complexity through structured information exchange.
Solution Approach 2:
The system uses channel state information and control messages as intermediaries to coordinate parameter adjustments between sending and receiving devices. These intermediaries carry the necessary information about optimal precoding configurations, enabling both devices to synchronize their parameters without direct complex coordination protocols.
3Productivity
If power is increased to overcome FEXT interference, then transmission rate is improved, but power limitations are exceeded
Solution Approach 1:
Instead of simply increasing power, the patent changes the precoding parameter set (different precoding matrices, ranks) to improve transmission efficiency. By optimizing the spatial structure of transmitted signals through parameter changes, the system achieves higher effective transmission rates without exceeding power limitations, utilizing the available power more efficiently through intelligent precoding.
Data Source
AI summary
A method for adjusting parameters of a sending device and a receiving device, and a terminal device are provided. In the method, a new precoding parameter that needs to be used by a sending device on a line when a precoding matrix in a downlink direction of the line changes, and a new signal recovery parameter that needs to be used by a receiving device and matches the new precoding parameter are first acquired; and then the new precoding parameter, the new signal recovery parameter, and a set moment and/or symbol at which the sending device starts to use the new precoding parameter are sent to the sending device, and the new signal recovery parameter and the set moment and/or symbol are sent to the receiving device by using the sending device.