Single Circuit WLAN Packet Detection for Multi-Standard Identification
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Solution Overview
Problem
Existing wireless communication systems require multiple packet detection circuits to identify different WLAN standards, leading to increased cost and IC layout area, especially when needing to detect three or more standards.
Innovation Solution
A single circuit with a shift register, determinator, and decision logic is used to identify the WLAN standard of a packet among multiple standards by analyzing the preamble periods, allowing for the demodulation of data without the need for separate circuits for each standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple packet detection circuits are used to detect different WLAN standards, then the ability to identify and demodulate multiple standards is improved, but the device complexity and IC layout area increase
Solution Approach 1:
The patent implements a single packet detection circuit that can detect multiple WLAN standards (802.11b, 802.11g, and future standards) by using configurable correlation thresholds and flexible preamble structure analysis. The circuit uses a universal detection mechanism that adapts to different standards through parameter configuration rather than requiring separate dedicated circuits for each standard, thereby reducing device complexity while maintaining multi-standard adaptability
2Adaptability or versatility
If multiple packet detection circuits are used to detect different WLAN standards, then the ability to identify and demodulate multiple standards is improved, but the IC layout area increases
Solution Approach 1:
The patent merges the functionality of multiple separate packet detection circuits into a single integrated circuit that can handle multiple WLAN standards. By combining the detection functions for 802.11b, 802.11g, and future standards into one circuit with shared resources (correlators, threshold comparators, and control logic), the IC layout area is significantly reduced while maintaining the ability to detect and identify multiple standards through configurable parameters
3Device complexity
If a single packet detection circuit is used to detect multiple WLAN standards, then the device complexity and IC layout area are reduced, but the difficulty of detecting and measuring different standards increases
Solution Approach 1:
The patent segments the detection process into distinct stages: preamble structure analysis, correlation computation with configurable thresholds, and standard identification based on detected patterns. By dividing the complex multi-standard detection task into manageable segments with clear decision boundaries, the circuit can efficiently handle multiple standards without excessive complexity. Each segment processes specific aspects of the preamble and passes results to the next stage, making the overall detection process more tractable
Data Source
AI summary
The present invention provides a single circuit and a method which can identify the WLAN standard of a packet or the modulation type of a packet. The single circuit includes a shift register, N determinators and decision logic. The shift register is configured to receive several periods of the preamble of the packet. Each of the N determinators is configured to determine whether the WLAN standard, or the modulation type, of the packet matches one of the N WLAN standards, or the N modulation types. Decision logic is configured to decide the WLAN standard, or the modulation type, of the packet.