Copper Wire Transceiver with Echo Cancellation for High Data Rate Transmission
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Solution Overview
Problem
The challenge is to increase data rates over copper wire cables, such as coaxial and twisted pair cables, while managing high attenuation and complexity in frequency band expansion, particularly for twisted pair cables which limit usable frequency bands and throughput due to high attenuation.
Innovation Solution
The solution involves a network device with multiple transceivers that implement channel bonding through multi-line and multi-band bonding, using echo and crosstalk cancellation, and dynamic frequency allocation to enhance data transmission efficiency on both coaxial and twisted pair cables, allowing for simultaneous transmission and reception across multiple channels or frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the frequency band is expanded to achieve higher data rates, then data rate is improved, but line attenuation increases
Solution Approach 1:
The patent divides the frequency band into multiple subcarriers (e.g., 4096 subcarriers in G.fast, 8192 for 424 MHz system, 16384 for 848 MHz system) and transmits data over multiple twisted pairs simultaneously. This segmentation allows the system to achieve higher data rates by distributing the transmission across multiple frequency channels and physical pairs, mitigating the impact of high attenuation on any single frequency or pair.
Solution Approach 2:
The patent transitions from single-carrier to multi-carrier modulation and from single twisted pair to multi-pair transmission. By adding spatial dimension (multiple twisted pairs) and frequency dimension (multiple subcarriers), the system achieves higher throughput despite high attenuation on individual channels through parallel transmission paths.
2Productivity
If the number of subcarriers is increased to expand the frequency band, then data rate is improved, but system complexity increases
Solution Approach 1:
The patent combines multiple twisted pairs and multiple frequency subcarriers into a unified transmission system. By merging spatial resources (multiple pairs) with frequency resources (multiple subcarriers), the system achieves high data rates through coordinated multi-dimensional resource utilization, managing complexity through integrated resource allocation rather than separate systems.
Solution Approach 2:
The patent creates a universal transmission framework that can operate across multiple frequency bands and multiple twisted pairs simultaneously. The system is designed to dynamically allocate and manage resources across all available channels, making the transmission infrastructure multi-functional and adaptable to different service requirements while maintaining a single coherent system architecture.
3Productivity
If multiple twisted pairs are used to increase data rate, then throughput is improved, but interference between pairs increases
Solution Approach 1:
The patent applies pre-coding techniques that anticipate and counteract crosstalk interference before transmission. By calculating and applying compensation signals in advance based on known channel characteristics, the system proactively neutralizes the harmful effects of inter-pair interference, allowing multiple twisted pairs to transmit simultaneously at high rates without degradation from crosstalk.
Data Source
AI summary
A device for transmitting and receiving on a coaxial cable or twisted pair cable is disclosed. The device includes a plurality of transceivers for transmitting signals to, and receiving signals from, at least one customer premise equipment (CPE) via a plurality of channels. The plurality of channels may be formed by using a plurality of twisted pairs cable or by using a plurality of frequency bands on a coaxial cable or a twisted pair. The device may also include at least one canceller for cancelling echo and/or crosstalk on at least one channel, and a processor configured to allocate to a single CPE multiple frequency bands on a single cable or multiple lines among a bundle of twisted pairs. The device may work for both coaxial cables and twisted pair cables and support for unified use of channel bonding in a frequency domain and a spacial domain.