Adaptive Frequency Duplexing for Crosstalk Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In duplexing environments, transceivers face challenges in maximizing data transmission capacity due to crosstalk and noise interference, particularly in frequency division duplex (FDD) mode, where downstream performance is affected by low-level noise below the echo-cancelled systems' threshold.
Innovation Solution
The system adaptively adjusts the frequency ranges of interconnected transceivers by selectively removing overlapping upstream or downstream carriers during a data phase, ensuring that the transmission capacity of one transceiver matches specified limits, thereby enhancing the data rate and reducing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency division duplex (FDD) mode is used to improve upstream transmission capacity, then upstream data rate increases, but downstream performance deteriorates due to low-level noise interference
Solution Approach 1:
The patent implements dynamic frequency allocation where the system adaptively switches between FDD and EC modes based on real-time channel conditions. The frequency division between upstream and downstream is not fixed but dynamically adjusted to optimize performance, allowing the system to transition from static FDD to adaptive frequency management that responds to varying noise and interference levels
Solution Approach 2:
The system changes operational parameters by adjusting the frequency spectrum allocation and switching between different transmission modes (FDD and EC). By modifying the frequency parameters and mode of operation based on detected noise levels and channel conditions, the system optimizes both upstream capacity and downstream reliability without being constrained to a single fixed configuration
2Productivity
If overlapping frequency bands are used in echo-cancelled (EC) mode to improve downstream performance, then downstream data rate increases, but upstream capacity is limited by crosstalk interference
Solution Approach 1:
The patent converts the harmful crosstalk interference into a useful diagnostic tool by measuring near-end crosstalk (NEXT) levels to determine optimal mode selection. The interference that normally degrades performance is instead used as information to guide the system in choosing between FDD and EC modes, transforming a harmful factor into a beneficial control mechanism
Solution Approach 2:
The system dynamically adjusts frequency band allocation and mode selection based on real-time crosstalk measurements. Rather than using fixed overlapping or non-overlapping bands, the system adaptively modifies frequency usage and operational mode to balance downstream data rate with upstream capacity, responding to changing interference conditions
3Ease of operation
If fixed frequency allocation is used to simplify system operation, then ease of operation improves, but transmission capacity is reduced due to inability to adapt to channel variations
Solution Approach 1:
The patent implements self-service through automatic mode selection and frequency allocation based on measured channel conditions. The system autonomously determines whether to operate in FDD or EC mode by measuring NEXT levels and capacity metrics, eliminating the need for manual configuration while maximizing transmission capacity. The transceivers self-adjust their operational parameters based on real-time feedback from the channel
Data Source
AI summary
A communication system and method adaptively control frequency ranges of a pair of interconnected transceivers in an effort to enhance the data rate in one direction. In this regard, a full duplex communication session is established between a first transceiver and a second transceiver. Signals having frequencies within an overlapping bandwidth are communicated between the first and second transceivers during a data phase. A transmission capacity of one of the transceivers is determined based on the communicated signals, and a comparison between this transmission capacity and a specified transmission capacity for the one transceiver is performed. A portion of the overlapping bandwidth is adaptively selected based on the comparison, and the one transceiver is prevented from transmitting signals having frequencies within the selected portion of the bandwidth during the data phase.