OBM-OFDM Network Device Subcarrier Allocation
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Solution Overview
Problem
Current optical communication networks face challenges in achieving terabit/second data transmission capacity due to limitations in channel data rates, spectral efficiency, and flexibility, especially in WDM systems, which are rigid and inefficient in PON access networks.
Innovation Solution
The implementation of an OBM-OFDM (Orthogonal Band Multiplexed OFDM) scheme with dynamically assignable OFDM subcarriers, using a network device that modulates and processes signals to optimize subcarrier allocation and conversion, enabling flexible capacity allocation and efficient downstream transmission in PON access networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uncorrelated WDM channels are used to increase channel data rate, then data transmission capacity is improved, but spectral efficiency deteriorates due to unused gaps between channels
Solution Approach 1:
The patent combines multiple WDM carriers into a single OFDM signal structure, merging previously separate channels into one unified transmission medium. This eliminates the spectral gaps between individual WDM channels while maintaining high data transmission capacity, thereby improving spectral efficiency without sacrificing productivity.
Solution Approach 2:
The patent introduces dynamic subcarrier assignment where OFDM subcarriers can be flexibly allocated to different network subscribers based on demand. This dynamic allocation allows the system to adaptively optimize spectral usage while maintaining high data rates, resolving the contradiction between fixed WDM channel structures and efficient spectrum utilization.
2Productivity
If classic WDM systems are used to achieve terabit/second capacity, then data transmission capacity is improved, but device complexity increases due to rigid node assignment and multiple uncorrelated channels
Solution Approach 1:
The patent creates a universal OFDM transmission system that can serve multiple network subscribers through a single optical channel. Instead of requiring separate WDM infrastructure for each subscriber, the system provides multi-functional capability where one channel can dynamically allocate resources to multiple users, thereby reducing device complexity while maintaining terabit/second capacity.
Solution Approach 2:
The patent segments the available spectrum into multiple OFDM subcarriers that can be independently assigned to different network subscribers. This segmentation allows flexible resource allocation and simplifies the overall system architecture by replacing rigid WDM node assignments with flexible subcarrier allocation, reducing device complexity while preserving high data transmission capacity.
3Loss of energy
If OBM-OFDM modulation is used to improve spectral efficiency, then spectral efficiency is improved, but adaptability to different data rates and PON access networks deteriorates due to rigid point-to-point design
Solution Approach 1:
The patent implements dynamic subcarrier assignment mechanisms that allow the OFDM system to adapt to different data rates and network configurations. Subcarriers can be flexibly allocated to different network subscribers based on their specific requirements, enabling the system to adapt to various PON access scenarios and data rate demands while maintaining high spectral efficiency.
Solution Approach 2:
The patent enables parameter changes in the OFDM system, particularly in the allocation and modulation of subcarriers. By dynamically adjusting subcarrier assignment and modulation parameters, the system can adapt to different data rates and network conditions, thereby improving versatility and adaptability while preserving the spectral efficiency benefits of OBM-OFDM modulation.
Data Source
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Figure 3a~3c
AI summary
A network device, in particular an optical network device, for modulating a plurality of network subscriber signals which are assigned to different network subscribers, according to the OFDM modulation scheme (OFDM: Orthogonal Frequency Division Multiplexing), comprises an assignment device (105) for assigning a first group of subcarriers to a first network subscriber signal (101), and for assigning a second group of subcarriers to a second network subscriber signal (102), and a modulation device (107) for modulating the first network subscriber signal (101) onto the first group of subcarriers using the inverse Fourier transform to obtain a first multicarrier signal, and for modulating the second network subscriber signal (103) onto the second group of subcarriers using the inverse Fourier transform to obtain a second multicarrier signal.