DOCSIS Communication System Frequency Divider Signal Multiplexing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current DOCSIS protocols, such as DOCSIS 3.1/3.0/2.0 and DOCSIS 4.0, fail to meet the increasing user demand for network speed due to limitations in upstream and downstream bandwidth, necessitating a more efficient signal transmission system.
Innovation Solution
A communication system based on the DOCSIS protocol that utilizes a frequency divider to split signals into downstream, upstream, and full-duplex communication paths, employing multiple filter paths and power amplifiers to ensure signal integrity and reduce interference, allowing for in-band multiplexing of upstream and downstream signals within specific frequency ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If bandwidth is expanded in DOCSIS 4.0 from 204 MHz to 684 MHz, then upstream/downstream rate is improved, but network speed still cannot meet current user needs
Solution Approach 1:
The patent segments the frequency spectrum into multiple orthogonal subcarriers (frequency domain segmentation) and divides data transmission into multiple parallel streams. By using OFDM technology, the system divides the 684 MHz bandwidth into many narrow subchannels, each carrying independent data streams, thereby dramatically increasing overall throughput and meeting high-speed network demands.
Solution Approach 2:
The patent transitions from single-carrier frequency division (one-dimensional frequency usage) to multi-carrier orthogonal frequency division (two-dimensional frequency-time resource allocation). By introducing time-domain spreading codes and orthogonal sequences, the system creates additional dimensions for resource multiplexing, enabling simultaneous transmission of multiple upstream and downstream signals without interference.
2Reliability
If multiple filter paths and power amplifiers are added to maintain signal integrity, then signal quality is improved, but device complexity increases
Solution Approach 1:
The patent designs filter paths and power amplifiers that serve multiple functions simultaneously. The same filter structure is used across different frequency subcarriers and signal directions (upstream/downstream), and power amplifiers are configured to handle multiple signal streams with unified control mechanisms. This multi-functionality reduces the need for separate dedicated components for each signal path.
Solution Approach 2:
The patent dynamically adjusts filter parameters (cutoff frequencies, Q-factors) and power amplifier gain settings based on real-time signal conditions and traffic demands. By changing operational parameters rather than adding fixed hardware components, the system adapts to varying requirements while maintaining signal integrity with minimal additional complexity.
Data Source
AI summary
A communication system based on DOCSIS protocol includes a server, configured to send a signal and demodulate a received signal; a coaxial cable, configured to transmit signals through a coaxial cable network; a frequency divider, configured to divide the signal sent by the server into a downstream signal and a full duplex signal; a downstream communication path, configured to transmit the downstream signal to a first modulation and demodulation unit; an upstream communication path, configured to transmit a upstream signal sent by a second modulation and demodulation unit to the server; a full duplex communication path, configured to simultaneously transmit the downstream signal divided by the frequency divider and the upstream signal, separate the downstream signal from the full duplex signal and transmit to the first modulation and demodulation unit, and transmit the upstream signal sent by the second modulation and demodulation unit to the server.