OFDM Tone Selection Module for 80 MHz Bandwidth Extension
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Solution Overview
Problem
Selecting tones for OFDM systems that allow for the reuse of existing components and minimize modifications is challenging, particularly when increasing channel bandwidth, such as from 40 MHz to 80 MHz, to enhance data transmission capacity.
Innovation Solution
A tone selection module that generates OFDM tone configurations, allowing for the reuse of existing interleavers and deinterleavers, by doubling the number of data tones and allocating tones for guard, pilot, and DC functions, while maintaining compatibility with existing systems, using a process that iterates through possible configurations to ensure valid combinations of modulation and code rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the channel bandwidth is increased from 40 MHz to 80 MHz to enhance data transmission capacity, then the data transmission capacity is improved, but the device complexity and difficulty of maintaining compatibility with existing components increases
Solution Approach 1:
The patent segments the 80 MHz bandwidth into two separate 40 MHz OFDM systems operating in parallel. Each system uses its own set of tones and existing interleaver/deinterleaver components, allowing the overall system to achieve 80 MHz capacity while reusing proven 40 MHz components without requiring complete system redesign
Solution Approach 2:
The patent creates a universal tone selection framework that can accommodate both 40 MHz and 80 MHz operations. The same tone selection module and interleaver architecture can serve multiple bandwidth configurations, making the system multi-functional and reducing the need for separate hardware for different bandwidths
2Ease of manufacture
If existing OFDM components are reused to minimize modifications, then the ease of manufacture and deployment is improved, but the adaptability to new bandwidth requirements deteriorates
Solution Approach 1:
The patent implements a dynamic tone selection mechanism that can adaptively choose between different tone configurations based on the desired bandwidth. The system can dynamically switch between 40 MHz and 80 MHz modes by selecting appropriate tone sets, maintaining adaptability while reusing the same physical hardware components
Solution Approach 2:
The patent nests two 40 MHz OFDM systems within an 80 MHz bandwidth framework. The existing 40 MHz components (interleavers, deinterleavers, tone selection logic) are nested and reused within the larger 80 MHz system architecture, allowing scalability while minimizing new component development
Data Source
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AI summary
A tone selection module selects tones suitable for use in an orthogonal frequency division multiplexing (OFDM) data transmission device based on several constraints. These constraints include number of available tones, modulation type, and code rate. The OFDM device may use either wired or wireless transmission.