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A liveness detection method for low-rate passive Internet of Things devices

A technology of an Internet of Things device and a detection method, which is applied in the field of activity detection of low-rate passive Internet of Things devices

Active Publication Date: 2021-06-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, one of the important challenges of connecting large-scale IoT devices is to detect active devices and obtain information from them with low latency.

Method used

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  • A liveness detection method for low-rate passive Internet of Things devices
  • A liveness detection method for low-rate passive Internet of Things devices
  • A liveness detection method for low-rate passive Internet of Things devices

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Embodiment Construction

[0028] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and implementation examples. Take the example where the RF source signal in the environment is a sinusoidal signal and a QPSK signal, and the receiver is a single receiving antenna.

[0029] Such as figure 1 As shown, it represents an unlicensed random access scheme. Under the unlicensed access scheme, each reflection device is assigned a pilot sequence for all time slots, which serves as the identification of each user. Under this access scheme, each active device directly sends its metadata and data to the base station without waiting for any permission from the base station, which reduces the transmission delay. The specific process is divided into two steps. First, the base station first detects active devices by detecting which pilot sequences are used, and uses the pilot to estimate the channel. In the second step, ...

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Abstract

The invention belongs to the technical field of wireless communication, and relates to a method for detecting activity of a low-rate passive Internet of Things device. The invention mainly includes that the base station detects the active degree of the user by detecting the pilot frequency, and estimates the channel by using the received pilot frequency information. Second, the estimated channel information is used to decode the data. In the general scenario of the Internet of Things, the base station communicates with multiple devices at the same time, but the activity of each device is very low, and in practical applications, the rate of the radio frequency source is greater than the rate sent by the reflection device. The present invention proposes to do corresponding processing at the receiver side to generate spread spectrum gain and improve the detection signal-to-noise ratio, so the detection performance is better than that of the approximate message passing algorithm directly, and has strong application value.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a method for detecting activity of a low-rate passive Internet of Things device. Background technique [0002] In recent years, the vigorous development of the Internet of Things technology has made it possible to connect people and things, and things and things on a large scale, and has greatly affected people's traditional lifestyles, medical care and government services. A typical application scenario of IoT technology is to solve large-scale machine-to-machine communication. This type of communication often presents the characteristics of large scale, low rate, low power consumption, and low activity. In particular, only a fraction of the large number of IoT devices are active within a certain time frame. Therefore, one of the important challenges in the connection of large-scale IoT devices is to detect active devices and obtain information sent by them with l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04W24/06H04W74/08
CPCH04L25/0224H04L25/0242H04L25/0262H04W24/06H04W74/0833
Inventor 梁应敞马俊龙睿哲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA