Wide Bandwidth Wireless Preamble for Legacy Device Compatibility
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Solution Overview
Problem
Current wireless communication systems face challenges in enabling effective communication between devices operating on multiple protocols within a wireless local area network, particularly in avoiding collisions and facilitating communication between newer and legacy devices.
Innovation Solution
The method involves determining the channel bandwidth and overlap with legacy devices, providing a legacy-readable preamble section, and generating a preamble for wide-bandwidth channels that includes a legacy carrier detect field, channel sounding field, and a legacy signal field to ensure compatibility and efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wide bandwidth signals are transmitted using newer protocols, then data transmission capability is improved, but compatibility with legacy devices deteriorates
Solution Approach 1:
The signal transmission is segmented into two distinct parts: a legacy-readable preamble section transmitted on legacy channels that legacy devices can detect and decode, and a wide bandwidth payload section that carries the actual high-speed data. This segmentation allows each part to serve its specific function - the preamble ensures legacy device compatibility while the payload enables high data transmission capability.
Solution Approach 2:
The legacy-readable preamble acts as an intermediary between legacy devices and wide bandwidth transmissions. It provides legacy devices with the necessary information to recognize and defer to ongoing transmissions, thereby enabling coexistence between legacy and modern devices without requiring legacy devices to understand the full wide bandwidth signal.
2Area of stationary object
If legacy devices operate on the same channel as newer devices, then network coverage is improved, but signal collisions increase
Solution Approach 1:
Legacy-readable preamble information is transmitted beforehand on legacy channels before the actual wide bandwidth data transmission begins. This preliminary action allows legacy devices to detect the incoming transmission, decode the preamble, and defer their transmissions accordingly, preventing collisions before they occur.
Solution Approach 2:
Different parts of the transmission have different qualities tailored to their specific receivers: the preamble portion is optimized for legacy device detection and decoding, while the payload portion is optimized for high-speed data transmission. This local quality differentiation allows simultaneous support for both legacy and modern devices on the same channel.
3Adaptability or versatility
If a legacy readable preamble is provided within the channel, then interoperability is improved, but channel bandwidth utilization deteriorates
Solution Approach 1:
The legacy-readable preamble is transmitted only partially across the full channel bandwidth - specifically, it is confined to the legacy channel portion rather than utilizing the entire wide bandwidth. This partial action approach provides sufficient legacy device compatibility information while leaving the remaining bandwidth available for high-speed payload transmission, thus minimizing the impact on overall channel utilization.
Data Source
AI summary
A method for generating a preamble of a frame for a wide-bandwidth channel wireless communication begins by generating a legacy carrier detect field. The method continues by generating a channel sounding field, wherein the channel sounding field includes a plurality of tones within the wide-bandwidth channel, wherein a first set of the plurality of tones corresponds to tones of a legacy channel sounding field. The method continues by generating a legacy signal field, wherein, in time, the legacy signal field follows the channel sounding field, which follows the legacy carrier detect field.