Wireless Signal Format Segmentation for Legacy Compatibility
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Solution Overview
Problem
Wireless communication systems face challenges in backward compatibility and interference when legacy devices coexist with newer standards, particularly due to differences in frequency ranges and signaling formats, which can lead to collisions and reduced data transmission efficiency.
Innovation Solution
A method for coding and modulating signals that includes determining a coding format to support communication over channels of different widths, using convolutional codes, and adding preambles to ensure compatibility with both legacy and newer standards, allowing for robust data transmission and reduced interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If legacy devices and newer standard devices coexist in the same WLAN, then backward compatibility is maintained, but interference and collisions occur between devices operating at different data rates and frequency ranges
Solution Approach 1:
The signal is divided into a legacy portion (preamble and signal field) that legacy devices can decode, and a non-legacy portion (data portion) that contains higher-rate data for newer devices. This segmentation allows legacy devices to recognize and avoid the channel during transmission without preventing newer devices from utilizing the full channel capacity.
Solution Approach 2:
A padded signal field is introduced as an intermediary element between the legacy signal field and the non-legacy data portion. This padded field acts as a buffer that legacy devices can decode to determine channel usage duration, while newer devices can ignore it and proceed directly to the high-rate data transmission.
2Device complexity
If a unified signaling format is used for both legacy and newer devices, then device complexity is reduced, but signaling precision and data transmission efficiency are compromised
Solution Approach 1:
Different portions of the signal are optimized for different device types: the preamble and signal field use legacy-compatible formats for precision decoding by legacy devices, while the data portion uses advanced modulation and coding schemes for high-rate transmission by newer devices. Each portion has locally optimized quality appropriate to its intended receivers.
Solution Approach 2:
The unified signal structure serves multiple functions simultaneously: it provides legacy-compatible signaling for backward compatibility, carries high-rate data for newer devices, and includes mechanism for legacy devices to determine channel occupancy duration. This multi-functionality resolves the contradiction between simplicity and precision.
3Productivity
If higher data rates are transmitted using newer standards, then productivity increases, but reliability decreases for legacy devices that cannot decode the advanced formats
Solution Approach 1:
The transmission is segmented into a reliable legacy portion (preamble and signal field) that ensures legacy device functionality, and a high-speed data portion that maximizes productivity for newer devices. The legacy portion maintains reliability while the data portion achieves higher transmission rates.
Solution Approach 2:
The legacy-compatible preamble and signal field are transmitted first as preliminary action, allowing legacy devices to decode and determine channel occupancy duration before the high-rate data transmission begins. This preliminary legacy signaling ensures reliability for older devices while enabling subsequent high-speed transmission.
Data Source
AI summary
Methods, devices and systems for wireless communication generate signals by determining whether legacy devices are within a proximal region of the wireless communication. When at least one legacy device is within the proximal region, a frame is formatted to include a preamble field, a signal field, and a data field. Further, the uncoded bits are encoded according to a coding format. The coding format is determined according to bits in the preamble and applicable sub-field lengths.