Repetition-Encoded FEC Broadcast Across Variable Receive Bandwidths
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Solution Overview
Problem
Data networks, particularly those using the G.hn standard, face challenges in efficiently transmitting broadcast messages across nodes with varying bandwidth capabilities, as each node needs to know the specific receive bandwidth of other nodes to communicate effectively, leading to limitations in high-speed services like HD video streaming and increased deployment costs.
Innovation Solution
Implementing a repetition scheme that generates repetition-encoded forward error correction (FEC) codewords, which are transmitted across the entire frequency band of a domain, allowing nodes to receive and decode messages without knowing the specific bandwidth of other nodes, enabling broadcast transmissions to all nodes in a domain without requiring knowledge of individual node bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nodes exchange broadcast messages using conventional schemes, then communication can occur, but nodes must know the specific receive bandwidth of other nodes, increasing system complexity and deployment costs
Solution Approach 1:
The frequency band is segmented into multiple subbands, and the codeword is divided into multiple parts that are transmitted across different subbands. Each node can receive the parts within its capable bandwidth range and reconstruct the original message, eliminating the need for nodes to know each other's total bandwidth capabilities.
Solution Approach 2:
The patent transitions from a single-dimension bandwidth allocation approach to a multi-dimensional approach by distributing codeword parts across multiple frequency subbands. This dimensional transformation allows nodes with different bandwidth capabilities to access different portions of the transmitted signal, resolving the contradiction between reliable delivery and bandwidth knowledge requirements.
2Productivity
If conventional transmission schemes are used, then bandwidth allocation can be managed, but deployment costs increase due to the need for bandwidth coordination between nodes
Solution Approach 1:
Each node autonomously determines which parts of the divided codeword it can receive based on its own bandwidth capabilities, without requiring coordination or knowledge of other nodes' bandwidths. This self-service mechanism dramatically simplifies deployment procedures and reduces costs while maintaining high network productivity.
3Adaptability or versatility
If broadcast messages are transmitted across the entire frequency band, then all nodes can potentially receive messages, but transmission complexity increases without the repetition encoding scheme
Solution Approach 1:
The patent combines forward error correction encoding with frequency band segmentation and codeword repetition. The codeword is encoded, divided into parts, and transmitted across multiple subbands with repetition, creating a unified transmission scheme that achieves bandwidth flexibility while managing complexity through systematic integration of multiple techniques.
Data Source
AI summary
A network device implements a repetition scheme to generate a repetition-encoded forward error correction (FEC) codeword for a FEC codeword. The repetition-encoded FEC codeword includes a set of N offset-shifted bit sequences. In some embodiments, each bit sequence is formed by M replicas of the FEC codeword and an offset is applied to shift the bit sequence where the offset is different for each bit sequence. The set of N offset-shifted bit sequences are allocated into N orthogonal frequency-division multiplexing (OFDM) symbols, wherein each offset-shifted bit sequence is allocated over a corresponding OFDM symbol.