Hybrid Balanced Coding Scheme for EPON Upgrade
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Solution Overview
Problem
Existing communication network infrastructure, particularly in Ethernet Passive Optical Networks (EPON), faces challenges in upgrading low-rate transmission systems to high-rate systems without complex changes, as existing two-code superposition schemes alter the original coding and fail to detect only one encoded sequence effectively.
Innovation Solution
The Hybrid Balanced Coding scheme generates a new code by combining a high-rate low-density code with a low-rate balanced code using operations like XOR, maintaining the low-rate code's characteristics and allowing detection of both codes, enabling seamless upgrade from 1 Gbps to 10 Gbps systems while maintaining compatibility with older systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two-code superposition schemes are used to enable high-rate transmission, then transmission rate is improved, but device complexity and difficulty of detecting encoded sequences worsen
Solution Approach 1:
The high-rate data stream is segmented into two separate encoded sequences: a low-rate balanced code and a high-rate low-density code. These sequences are superimposed using XOR operation, allowing the receiver to detect them separately through frequency filtering, thus achieving high transmission rate without excessive complexity
Solution Approach 2:
The patent introduces an intermediary frequency component in the high-rate low-density code that acts as a mediator. This intermediary allows the receiver to distinguish and detect the high-rate sequence from the low-rate balanced code through frequency-based separation, solving the detection difficulty in superposition schemes
2Productivity
If two-code superposition schemes are used to enable high-rate transmission, then transmission rate is improved, but ease of operation worsens
Solution Approach 1:
The patent applies preliminary action by pre-designing the high-rate code with specific frequency characteristics (intermediary frequency) and the low-rate code with balanced properties before superposition. This preliminary design ensures that the receiver can easily separate and detect the sequences using simple frequency filtering, without complex real-time processing
Solution Approach 2:
Different parts of the superimposed signal are given different local qualities: the low-rate code maintains balanced properties (equal 0s and 1s) while the high-rate code has low-density properties with specific frequency characteristics. This local differentiation enables easy separation and detection at the receiver
3Productivity
If original low-rate coding is altered to achieve high-rate transmission, then transmission rate is improved, but compatibility with old systems worsens
Solution Approach 1:
The patent merges the low-rate balanced code and high-rate low-density code through superposition, creating a hybrid code that combines the benefits of both. The low-rate balanced code maintains compatibility with old systems, while the high-rate component enables new transmission rates, achieving both upgrade and compatibility
Solution Approach 2:
The hybrid balanced code serves multiple functions: it maintains compatibility with old low-rate systems (which can detect only the balanced code component) while simultaneously enabling new high-rate transmission capabilities. This multi-functionality allows the same transmission medium to serve both legacy and advanced systems
Data Source
AI summary
A hybrid balanced code is formed from a low rate (narrow bandwidth) balanced code and a high rate (wide bandwidth) low density code. Data encoded using the hybrid balanced code is transmitted between a first communication network entity and a second communication network entity. The hybrid code enables a system having a hybrid transmitter to transmit either a low rate stream detectable by a low rate receiver or a hybrid stream, from which the low rate data may be detected by a low rate receiver while both the high rate data and the low rate data may be detected by a high rate receiver.