WLAN Receiver TOA Detection via Signal Waveform Trigger
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Solution Overview
Problem
Existing real-time location systems (RTLS) in wireless local area networks (WLANs) face challenges in simplicity, flexibility, and cost-effectiveness, particularly in integrating with existing IT communications systems and accurately locating access points and wireless nodes.
Innovation Solution
A WLAN system with a receiver acting as a network client, equipped with a radio frequency front-end circuit, signal waveform detector, baseband processor, and system controller, which can detect and process wireless signals to provide time-of-arrival information and message data, allowing for location determination and communication with a server, while being remotely configurable and compatible with existing network security processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a receiver connects to the network as a client and incorporates existing IT communications systems, then the system simplicity and ease of integration are improved, but the ability to independently locate access points and communicate with servers may be compromised
Solution Approach 1:
The receiver is designed to perform multiple functions: it operates as a network client for general communication while simultaneously functioning as a location determination device. The baseband processor can process both standard network protocols and location-specific signal formats, enabling the single device to serve dual purposes without requiring separate dedicated location hardware.
Solution Approach 2:
The system allows the receiver to dynamically switch between operating modes - it can function as a standard network client when location services are not needed, and activate location determination capabilities when required. The baseband processor can be reconfigured via firmware to handle different signal types and processing requirements, providing operational flexibility.
2Ease of manufacture
If the receiver incorporates existing IT communications systems, then the cost-effectiveness is improved, but the measurement precision for location determination may be reduced
Solution Approach 1:
The signal processing function is segmented into two distinct components: the RF front-end circuit handles signal reception and initial processing using standard IT hardware, while the baseband processor is specifically dedicated to time-of-arrival detection and location calculations. This segmentation allows each component to be optimized for its specific function while using cost-effective existing technology.
Solution Approach 2:
The baseband processor acts as an intermediary between the standard RF front-end and the location determination algorithm. It receives raw signals from the RF circuit, performs specialized time-of-arrival extraction processing, and outputs location data. This intermediary layer enables precise location measurement using otherwise generic communication hardware.
3Adaptability or versatility
If the receiver processes multiple signal types and formats, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The baseband processor utilizes firmware-based configuration to change processing parameters dynamically. Instead of requiring multiple hardware circuits for different signal types, the same hardware can be reconfigured via software to handle various modulation formats, data rates, and signal structures by adjusting processing algorithms and parameters.
Data Source
AI summary
A wireless local area network (WLAN) includes a server and receiver, which includes a radio frequency (RF) front-end circuit that receives wireless signals from the mobile nodes within the WLAN and detects baseband signals. A signal waveform detector edge detects a signal waveform and generates a trigger signal indicative of the modulation type, data format and time-of-arrival (TOA) information of a desired signal to be captured. A baseband processor receives the trigger signal from the signal waveform detector and captures the desired signal. A system controller is connected to the baseband processor and configures the baseband processor for processing the desired signal and obtaining message data and signal metrics that are transferred to the system controller to be communicated outbound from the receiver as a client to the server.