Distributed Tone Mapping for Long-Range Wi-Fi Synchronization
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Solution Overview
Problem
Wi-Fi 6 lacks a defined PPDU format for long-range transmission, making timing synchronization, frequency offset estimation, and channel estimation challenging in long-range wireless communication systems.
Innovation Solution
A device and method for distributed tone mapping in long-range wireless communication systems, where input data is modulated to generate a long-range packet with a long-range signal field and data field, and each modulated bit is spread into multiple symbols in the frequency domain using radio-frequency circuitry, improving receiver performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If Wi-Fi 6 standard is used for long-range transmission, then transmission distance is extended, but timing synchronization and frequency offset estimation become difficult
Solution Approach 1:
The patent segments the long-range transmission signal into multiple components including legacy SIG fields and new LR-SIG fields. Each segment serves specific functions: legacy fields maintain compatibility with existing Wi-Fi 6 standards for basic transmission, while LR-SIG fields provide enhanced timing synchronization and frequency offset estimation capabilities specifically for long-range scenarios. This segmentation allows the system to extend transmission distance while maintaining precise synchronization through dedicated field structures.
2Length of stationary object
If Wi-Fi 6 standard is used for long-range transmission, then transmission distance is extended, but channel estimation becomes difficult
Solution Approach 1:
The patent implements preliminary action by incorporating dedicated LR-STF (Long-Range Short Training Field) and LR-LTF (Long-Range Long Training Field) sequences before the actual data transmission. These training fields are specifically designed for long-range channel characteristics and are transmitted in advance to enable the receiver to perform accurate channel estimation before receiving the main data payload. This preliminary preparation allows the system to overcome channel estimation difficulties in long-range scenarios while maintaining extended transmission distance capability.
3Measurement precision
If modulated bits are spread into multiple symbols in frequency domain, then receiver sensitivity is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the distributed tone mapping mechanism to serve multiple functions simultaneously. The same spreading and distribution process across frequency domain tones not only improves receiver sensitivity through better signal distribution and noise averaging but also provides inherent robustness against frequency selective fading and enables more accurate channel estimation. This multi-functionality allows the system to achieve enhanced receiver sensitivity without proportionally increasing device complexity, as the complexity is justified by multiple performance benefits.
Data Source
AI summary
A device is provided, which includes radio-frequency circuitry and an encoder. The encoder is configured to modulate input data to generate a long-range packet, and to transmit the long-range packet to a receiver through the radio-frequency circuitry. The long-range packet includes a long-range signal field (LR-SIG) and a long-range data field (LR-DATA). Each modulated bit in the long-range signal field and the long-range data field is spread into a plurality of spread modulated bits that are distributed into a plurality of symbols in a frequency domain.