Wideband RF Carrier Multiplexing for HD Content Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cable television networks face challenges in efficiently transmitting High Definition (HD) programs due to high bandwidth requirements, limiting the number of HD programs that can be multiplexed and transmitted over a single RF channel, which restricts the effectiveness of statistical multiplexing.
Innovation Solution
The development of a wideband content distribution system that allows for the efficient transmission of HD programs by processing and multiplexing them across multiple non-contiguous RF channels, using a system that includes a server to apply operator-controlled rules, encryption, and decryption, while ensuring backwards compatibility with legacy customer premises equipment (CPE).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If HD programs are transmitted over a single RF channel using conventional multiplexing, then the transmission can be compatible with legacy CPE, but the number of HD programs that can be multiplexed is limited due to high bandwidth requirements
Solution Approach 1:
The patent segments the transmission of HD programs across multiple RF channels instead of confining them to a single channel. Each RF channel carries a portion of the multiplexed HD program data, allowing the system to distribute the bandwidth burden across multiple carriers while maintaining compatibility with legacy CPE that can decode content from individual channels
Solution Approach 2:
The patent transitions from two-dimensional multiplexing (multiple programs on one channel) to three-dimensional multiplexing by adding the RF channel dimension. Programs are multiplexed across both time/space within each RF channel and across multiple RF channels, creating a multi-dimensional transmission space that increases capacity while preserving legacy compatibility
2Loss of energy
If statistical multiplexing is used to efficiently pack multiple programs, then bandwidth utilization improves, but the pool size is limited when transmitting HD programs due to high bitrate requirements
Solution Approach 1:
The statistical multiplexing pool is segmented across multiple RF channels, allowing the system to aggregate bandwidth resources from multiple carriers. This segmentation enables a larger effective pool size for statistical multiplexing by combining the capacity of individual RF channels while maintaining the bandwidth utilization efficiency benefits of statistical multiplexing
Solution Approach 2:
The patent merges the bandwidth resources of multiple RF channels into a unified statistical multiplexing pool. By combining the available bandwidth from each carrier, the system creates a larger aggregate pool that can accommodate more HD programs while maintaining efficient bandwidth utilization through statistical multiplexing techniques
Data Source
AI summary
A method and apparatus to create and transmit transport multiplexes comprising one or more levels of service over a network. In one embodiment, the level of service comprises high definition (HD) content or programs, and the transmitted multiplexes are distributed over a plurality of downstream RF carriers in a cable network simultaneously. A head-end architecture for performing the multiplexing and distribution of multiple HD programs over the multiple carriers (i.e., in a “wideband” configuration) is disclosed. CPE having one or more wideband tuners is also disclosed, the CPE being adapted to receive the multiplexed HD content from the various RF carriers, and demultiplex it in order to permit decoding and subsequent viewing by the user. The use of multiple HD source programs with the multiplex advantageously provides for enhanced statistical multiplexing by providing a larger “pool” of constituent inputs and available carriers.