Remodulator Circuitry Frequency Extension for Cable Modems
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Solution Overview
Problem
Next-generation cable technology (DOCSIS 3.1) requires full duplex operation, where the cable modem termination system (CMTS) needs to transmit and receive simultaneously on the same frequency, while current modems are limited to a narrow frequency band, restricting throughput and service offerings.
Innovation Solution
The system extends the transmission frequency band by incorporating remodulator circuitry in the analog front end (AFE) that upconverts or downconverts DOCSIS channels to a wider frequency range while maintaining synchronization with a master clock, allowing for dynamic switching between transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the modem operates in a narrow frequency band as in current technology, then the device complexity is low, but the throughput capacity and service offerings are limited
Solution Approach 1:
The system segments the frequency band into multiple channels that can be independently modulated and transmitted. The modem divides the available spectrum into separate frequency channels, each carrying independent data streams, thereby increasing overall throughput capacity while managing complexity through modular channel processing
Solution Approach 2:
The patent transitions from single-frequency operation to multi-frequency operation by adding the frequency dimension to the transmission capability. This allows simultaneous transmission on multiple frequency channels, effectively increasing throughput capacity without proportionally increasing device complexity through efficient frequency multiplexing
2Adaptability or versatility
If the modem is limited to a narrow frequency band, then the ease of operation is maintained, but the adaptability to different service offerings is reduced
Solution Approach 1:
The modem implements dynamic frequency allocation where channels can be dynamically assigned to different service offerings based on demand. The system can adaptively switch between transmission and reception on different frequency channels, providing versatility for various service types while maintaining ease of operation through automated channel management
Solution Approach 2:
The modem is designed with multi-functionality to support diverse service offerings across a wide frequency band. By incorporating universal channel processing capabilities that work across multiple frequencies, the system can provide various services (data, voice, video) without requiring separate dedicated hardware for each service type
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables full duplex operation, allowing multiple cable modems to transmit on a wider band, enhancing throughput capacity and enabling service operators to offer higher service offerings by dynamically allocating bandwidth.
Implementation Method 1
incorporating remodulator circuitry in the analog front end (AFE) that upconverts or downconverts DOCSIS channels to a wider frequency range
Data Source
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AI summary
Methods and systems for remodulating a signal from a system on chip with an analog front end are described. A method includes receiving, with an analog front end component, a digital modulated signal having a first frequency from a system on chip (SoC) and synchronized with a master clock signal; remodulating the digital modulated signal to a remodulated signal having a target frequency, wherein the remodulated signal is synchronized with the master clock signal; and converting the remodulated signal to an analog output signal of the analog front end component.