Adaptive Sub-Carriers for WLAN Throughput and Legacy Compatibility
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Solution Overview
Problem
Current wireless local area networks (WLANs) face challenges in achieving high data throughput while maintaining backward compatibility with legacy devices, particularly in supporting multiple-input multiple-output (MIMO) communications that are efficient and compatible with existing IEEE 802.11 standards.
Innovation Solution
The development of a WLAN device that employs adaptive sub-carriers and spatial-time encoding, allowing for high data throughput while being backward compatible with legacy devices, by utilizing multiple antennae and advanced encoding techniques such as space-time encoding and error correction codes, to enhance data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If advanced MIMO communications with multiple antennae and adaptive sub-carriers are implemented, then data throughput is improved, but device complexity and compatibility with legacy devices deteriorate
Solution Approach 1:
The patent segments the available sub-carriers into different groups and selectively activates only the necessary number of sub-carriers based on channel conditions and data throughput requirements. This segmentation allows the system to achieve high throughput when needed while reducing complexity by deactivating unnecessary carriers, thereby resolving the contradiction between productivity and device complexity.
Solution Approach 2:
The system dynamically adjusts the number of active sub-carriers and MIMO configurations based on real-time channel conditions, traffic load, and legacy device presence. This dynamic adaptation allows the system to optimize throughput when conditions permit while automatically reducing complexity when legacy compatibility is required, effectively resolving the technical contradiction.
2Productivity
If adaptive sub-carriers and spatial-time encoding are used, then data transmission efficiency is improved, but compatibility with legacy IEEE 802.11 devices deteriorates
Solution Approach 1:
The patent applies advanced MIMO and adaptive sub-carrier techniques selectively to specific spatial streams and frequency sub-carriers rather than uniformly across all transmissions. By applying these advanced techniques only where channel conditions support them and where legacy devices will not interfere, the system achieves high transmission efficiency while maintaining compatibility with legacy IEEE 802.11 devices in other portions of the spectrum or spatial domains.
Solution Approach 2:
The system is designed to support multiple operational modes including both advanced MIMO with adaptive sub-carriers and traditional legacy IEEE 802.11 modes. This multi-functionality allows the system to automatically switch between advanced high-efficiency modes and legacy-compatible modes depending on the presence and capabilities of communicating devices, thereby resolving the contradiction between transmission efficiency and compatibility.
3Productivity
If multiple antennae for MIMO communications are deployed, then data throughput is improved, but device complexity increases
Solution Approach 1:
The patent implements MIMO communications with a selective number of spatial streams rather than always using the maximum number of available antennae. By activating only the necessary number of spatial streams based on channel conditions and throughput requirements, the system achieves sufficient data throughput while reducing the complexity of signal processing and hardware requirements, thereby resolving the contradiction between productivity and device complexity.
Data Source
AI summary
Downclocking and/or adaptive sub-carriers for single user, multiple user, multiple access, and/or MIMO wireless communications. Communication device operation within a wireless local area network (WLAN/WiFi) is effectuated in the frequency spectra typically associated with television broadcast channels. Operation is made on a secondary non-interfering basis to such television broadcast channels. Any desired channel bandwidth (e.g., 6 MHz, 7 MHz, 8 MHz, etc.) may be employed. Adaptation with respect to the number of data sub-carriers within different respective packets may be made in accordance with two or more respective operational modes. For example, modification of the number of data sub-carriers in different respective packets may be made to increase the signal bandwidth from a first band was to a second bandwidth. Also, appropriate frequency down-clocking of a first channel bandwidth may be performed to generate the desired channel bandwidth to be employed within an available television broadcast channel bandwidth.