Composite Channel OFDM Symbol Generation with Adjustable Guard Tones
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems using orthogonal frequency division multiplexing (OFDM) face challenges in efficiently generating OFDM symbols with varying channel bandwidths and guard tones, which affects data throughput and compliance with regulatory spectral masks.
Innovation Solution
A method and device configuration that utilize multiple transmit flow units to generate OFDM symbols with adjustable channel bandwidths and increased guard tones, allowing for the creation of composite channel OFDM symbols with enhanced guard tone configurations without reducing data or pilot tones, thereby improving spectral efficiency and regulatory compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transmit flow units are used to generate composite channel OFDM symbols with increased guard tones, then spectral efficiency and regulatory compliance are improved, but device complexity increases
Solution Approach 1:
The system divides the OFDM symbol generation into multiple transmit flow units, where each unit handles a specific portion of the tone mapping. The first transmit flow unit generates a first set of OFDM tones while the second transmit flow unit generates a second set of OFDM tones, allowing parallel processing and reduced complexity in each individual unit while achieving the overall compliance goal
Solution Approach 2:
The patent combines the output of multiple transmit flow units to form a composite channel OFDM symbol. The first and second sets of OFDM tones are merged into a single composite symbol with increased guard tones, achieving spectral efficiency and regulatory compliance through the combined output of multiple simpler units
2Productivity
If guard tones are increased in composite channel OFDM symbols, then spectral efficiency is improved, but the number of available data tones is reduced
Solution Approach 1:
The system dynamically adjusts the distribution of tones across multiple transmit flow units. By generating separate sets of OFDM tones that are then combined into a composite symbol, the system can optimize the guard tone configuration to improve spectral efficiency while maintaining the required data throughput through coordinated tone allocation across the multiple units
3Adaptability or versatility
If OFDM symbols are generated with varying channel bandwidths, then adaptability to different transmit modes is improved, but manufacturing precision requirements increase
Solution Approach 1:
The tone mapping units are designed with multi-functionality to handle different channel bandwidths and transmit modes. Each transmit flow unit can generate OFDM tones for various bandwidth configurations (e.g., 20 MHz, 40 MHz, 80 MHz), and by combining multiple units, the system can adapt to different composite channel configurations while maintaining consistent tone mapping precision through standardized processing procedures
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A communication device comprises a network interface including at least i) a first transmit flow unit, and ii) a second transmit flow unit. The network interface is configured to generate, using the first transmit flow unit and when in a composite channel transmit mode, a first set of OFDM tones, and generate, using the second transmit flow unit and when in the composite channel transmit mode, a second set of OFDM tones. Further, the network is configured to generate, when in the composite channel transmit mode, a composite channel OFDM symbol comprising the first and second sets of OFDM tones. The composite channel OFDM symbol includes lower-edge and upper-edge guard tones, with at least one of i) the number of lower-edge guard tones being greater than a first number of lower-edge guard tones used in a first transmit mode different than the composite channel transmit mode and greater than a second number of lower-edge guard tones used in a second transmit mode different than the composite channel transmit mode, and ii) the number of upper-edge guard tones being greater than a first number of upper-edge guard tones used in the first transmit mode and greater than a second number of upper-edge guard tones used in the second transmit mode.