Bit Stream Distribution Circuit for Variable Subcarrier Transmission Speeds

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional optical communication systems cannot change the transmission speed of data carried by subcarriers, limiting their adaptability and efficiency.

Innovation Solution

An information bit stream distribution device that processes valid and invalid bit streams to extract and transmit data at different speeds by separating transmission data into multiple streams, allowing for adjustable transmission speeds on each subcarrier.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the conventional optical communication system uses a fixed distribution matching circuit, then the signal point arrangement can be shaped using probability distributions, but the transmission speed of transmission data cannot be changed

Engineering Contradiction:

Improvetransmission speed adaptabilityVSAvoidsystem complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The transmission data is segmented into multiple groups with different bit numbers (sb and st), where each group can be transmitted at different speeds. This segmentation allows the system to achieve variable transmission speeds by selectively transmitting different groups of data bits, thereby resolving the contradiction between adaptability and complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically adjusts the transmission speed by varying the number of bits transmitted in each time period based on the importance and timing requirements of different data groups. This dynamic adjustment mechanism enables the system to adapt transmission speeds without requiring complete system redesign, thus improving adaptability while controlling complexity.

Inventive Principle:

Principle #15Dynamics

2Productivity

If the transmission speed is increased for higher productivity, then more data can be transmitted, but the system loses the ability to differentiate transmission speeds for different data types

Engineering Contradiction:

Improvetransmission speedVSAvoidspeed differentiation capability

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

Different parts of the transmission data are assigned different quality levels in terms of transmission speed. Important data with tight deadlines is transmitted at higher speeds with fewer dummy bits, while less critical data is transmitted at lower speeds with more dummy bits. This local differentiation of transmission quality maintains productivity while preserving adaptability for different data types.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system changes the parameter of bit stream composition by adjusting the ratio of valid data bits to dummy bits according to transmission speed requirements. By varying this parameter dynamically, the system can achieve different transmission speeds for different data groups, thereby maintaining both high productivity and speed differentiation capability.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If dummy bits are added to achieve probabilistic shaping, then signal point arrangement can be optimized, but the transmission speed becomes fixed and cannot be adjusted

Engineering Contradiction:

Improvesignal point arrangement qualityVSAvoidtransmission speed flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The distribution matching circuit is designed to perform multiple functions: it not only optimizes signal point arrangement through probabilistic shaping but also enables variable transmission speed control. By integrating both functions into a single universal circuit, the system achieves reliable signal transmission while maintaining the flexibility to adjust transmission speeds for different data groups.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The bit stream is constructed as a composite structure combining valid data bits and dummy bits in varying proportions. This composite structure allows the system to achieve both probabilistic shaping for reliable transmission and adjustable transmission speeds by modifying the composition ratio, thereby resolving the contradiction between reliability and adaptability.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS20240089024A1Information bit stream distribution device, information bit stream conversion circuit, information bit stream distribution method, information bit stream decoding device, and information bit stream inverse conversion circuit

Publication Date: 2024.03.14 MITSUBISHI ELECTRIC CORP

AI summary

An information bit stream having a valid bit stream and an invalid bit stream is acquired. From the transmission data included in the valid bit stream of the information bit stream, some pieces of transmission data are extracted as first transmission data. An information bit stream having a valid bit stream including the first transmission data and an invalid bit stream are outputted as a first information bit stream in which the first transmission data is transmitted at a first speed. From the transmission data included in the valid bit stream of the acquired information bit stream, transmission data other than the first transmission data is extracted as second transmission data. An information bit stream having a valid bit stream including the second transmission data and an invalid bit stream as a second information bit stream in which the second transmission data is transmitted at a second speed is outputted.