Universal CATV Digital Modules With Bandwidth-Based Sampling Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cable operators face challenges in supporting higher upstream data speeds with older analog return links, which are unable to meet the increased performance requirements of DOCSIS 3.0 and other platforms, and there is a need for cost-effective digital solutions for both upstream and downstream digital CATV systems to manage varying bandwidths and channel configurations.
Innovation Solution
The implementation of a universal digital transmitter and receiver module with a personality module that adapts to different bandwidths and channel configurations, using RF filters and memory to select appropriate sampling rates, and the use of programmable signal conditioners for A/D and D/A conversions, allowing for flexible configuration and reduced inventory costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single digital transmitter module is designed to support multiple bandwidths and channel configurations, then adaptability and versatility are improved, but device complexity increases
Solution Approach 1:
The patent implements a universal digital transmitter module that can operate across multiple bandwidths (5-45 MHz, 5-65 MHz, 5-85 MHz) and support various channel configurations (1-8 channels) through a single integrated design. The module incorporates programmable signal conditioners, configurable A/D converters, and flexible RF filtering that adapt to different service requirements, eliminating the need for multiple specialized modules while maintaining optimal performance across all configurations
Solution Approach 2:
The module employs dynamically configurable parameters including programmable sampling rates for the A/D converter that adapt to the selected bandwidth, configurable channel bandwidths, and adjustable RF filter characteristics. These dynamic adjustments allow the same hardware to optimize its performance characteristics for each specific service configuration, resolving the contradiction between versatility and complexity through software-controlled adaptability
2Adaptability or versatility
If analog to digital converters are used with fixed sampling rates, then device complexity is reduced, but adaptability to different bandwidths deteriorates
Solution Approach 1:
The patent implements programmable sampling rates for the A/D converter that can be dynamically adjusted based on the selected service bandwidth. The system automatically configures the sampling rate parameter to match the required bandwidth (e.g., higher sampling rates for 85 MHz bandwidth, lower rates for 45 MHz), allowing the same hardware to adapt to different bandwidth requirements without requiring multiple fixed-rate converters, thus resolving the contradiction between adaptability and complexity
Data Source
AI summary
Configuring a generic adaptable reconfigurable digital receiver having a programmable signal conditioner includes specifying a number of output RF channels; specifying an RF bandwidth of an output channel; and selecting a digital to analog sampling rate of a digital to analog convertor of the programmable signal conditioner as a function of the RF bandwidth of the output channel using a processor/demux of the generic adaptable reconfigurable digital receiver.