Coaxial Data Transfer System Using OFDM and QAM
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Solution Overview
Problem
Current data transfer rates in hybrid fiber-coaxial networks are limited to 3-50 Mbit/s, and existing solutions to increase rates are either costly or require deep fiber deployment or active components, which are not cost-effective and disrupt existing architectures.
Innovation Solution
A data transfer system that operates over coaxial networks at bandwidths above 1000 MHz, using orthogonal frequency division multiplexing (OFDM) and quadrature amplitude modulation (QAM) to deliver high data rates between optical nodes and cable modems, leveraging the existing coaxial cable infrastructure and passive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If deep fiber deployment is used to increase data transfer rates, then data transfer rate is improved, but system complexity and cost increase
Solution Approach 1:
The patent transitions from traditional frequency multiplexing to spatial multiplexing using multiple orthogonal codes. By adding a spatial dimension to signal separation, multiple data streams can be transmitted simultaneously over the same frequency band without requiring additional physical infrastructure like deep fiber deployment, thus increasing data transfer rates while maintaining system simplicity
Solution Approach 2:
The patent changes the fundamental parameter of signal separation from frequency-based to code-based orthogonal separation. This parameter change enables higher data rates by allowing multiple signals to coexist in the same frequency band, eliminating the need for complex deep fiber deployments while achieving the desired speed improvement
2Speed
If active components are added between optical node and CPE to increase data rates, then data transfer rate is improved, but cost and device complexity increase
Solution Approach 1:
The patent extracts the signal separation function from the physical layer infrastructure and relocates it to the signal processing layer using orthogonal codes. This eliminates the need for active components between optical nodes and CPE, reducing both cost and complexity while maintaining high data transfer rates through code-based multiplexing
Solution Approach 2:
The patent replaces the mechanical/physical approach of using separate physical media or active components with a mathematical/code-based approach. Orthogonal codes provide signal separation without requiring additional physical infrastructure or active components, significantly reducing system cost and complexity
3Ease of manufacture
If existing coaxial infrastructure is used to increase data rates, then cost is reduced, but data transfer rate remains limited
Solution Approach 1:
The patent makes the existing coaxial infrastructure support multiple functions simultaneously by enabling orthogonal code division multiplexing. The same physical medium can carry multiple high-rate data streams through code-based separation, achieving high data rates without requiring new infrastructure investment
Solution Approach 2:
The patent segments the data transmission into multiple orthogonal code channels that can be independently modulated and transmitted. This segmentation allows the existing coaxial infrastructure to carry multiple simultaneous data streams, effectively multiplying the data transfer rate without increasing physical bandwidth requirements
4Device complexity
If traditional frequency multiplexing is used to deliver data, then system complexity is reduced, but data transfer rate is limited
Solution Approach 1:
The patent introduces a code dimension orthogonal to the frequency dimension. Instead of separating signals only by frequency, signals are now separated by orthogonal codes, adding a new dimension to the multiplexing scheme. This enables higher data rates without proportionally increasing system complexity
Solution Approach 2:
The patent creates a composite signaling approach combining frequency modulation with orthogonal code modulation. This composite signaling method leverages the simplicity of frequency-based systems while adding the capacity-multiplying power of code division, achieving high data rates with manageable complexity
Data Source
AI summary
Methods and apparatus are described for transmitting and receiving data. A method includes a process of transferring data over a coaxial network at a bandwidth above 1000 MHz, wherein the process of transferring data transfers the data between an optical node and a plurality of cable modems of a hybrid fiber-coaxial cable network. An apparatus includes a data transfer system which sends and receives data over a coaxial network at a bandwidth above 1000 MHz, wherein the data transfer system is located at an optical node of a hybrid fiber-coaxial cable network.