Wireless Distance Measurement Using Signal Reflection
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Solution Overview
Problem
Current wireless communication systems lack an efficient method for conveniently measuring distances between wireless devices and reflectors or between devices themselves, which is essential for various applications such as smart home and IoT technologies.
Innovation Solution
The implementation of a method and apparatus that utilize wireless devices to transmit and receive signals for distance measurement, where one device transmits a signal and another device estimates the distance based on the received signal and its reflection from a reflector, using techniques like mmWave signals and Near Field Communication (NFC) for accurate distance calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wireless devices transmit and receive signals for distance measurement, then distance measurement capability is provided, but the system lacks efficient and convenient measurement methods
Solution Approach 1:
The patent introduces a reflector as an intermediary object to facilitate distance measurement. The reflector receives signals from the first wireless device and reflects them to the second wireless device, enabling indirect distance measurement when direct line-of-sight is unavailable. This mediator approach solves the problem of measuring distances in environments where devices cannot directly communicate signals.
Solution Approach 2:
The patent divides the distance measurement system into separate functional components: a first wireless device for signal transmission, a second wireless device for signal reception and distance calculation, and an optional reflector for signal redirection. This segmentation allows each component to specialize in specific tasks, improving overall measurement efficiency and convenience.
2Measurement precision
If distance measurement between two wireless devices is implemented, then spatial awareness is improved, but the measurement method becomes complex
Solution Approach 1:
The second wireless device autonomously calculates the distance between itself and the first wireless device by processing received signals and timing information. This self-service approach eliminates the need for centralized coordination or complex multi-device negotiation protocols, simplifying the overall system while maintaining measurement accuracy.
3Adaptability or versatility
If signal transmission and reflection are used for distance measurement, then measurement coverage is extended, but signal processing complexity increases
Solution Approach 1:
The system uses feedback from signal timing measurements to determine distance. The second wireless device measures the time of flight of signals transmitted by the first device and reflected by the reflector, then uses this feedback information to calculate distance. This feedback mechanism enables extended measurement coverage through reflection while keeping signal processing relatively simple through straightforward time-based calculations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables convenient and accurate distance measurement between wireless devices and reflectors, improving user experience in applications like smart home and IoT by providing precise distance information with user-friendly interfaces and high accuracy.
Implementation Method 1
receiving a signal reflected by a reflector after being transmitted from the first wireless device
Data Source
AI summary
The present disclosure relates to a sensor network, Machine Type Communication (MTC), Machine-to-Machine (M2M) communication, and technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the above technologies, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. An apparatus and method for measuring a distance between wireless devices using a first signal transmitted/received between the wireless devices in a wireless communication system are provided. The method includes: receiving the first signal for distance measurement transmitted from a first of the wireless devices; receiving a signal reflected by a reflector after being transmitted from the first of the wireless devices; and based on the received first signal and the received reflected signal, estimating a distance between the second of the wireless devices and the reflector.