Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Improving the frequency domain resolution of Wireless signal for observing the Doppler frequency

도플러 주파수 관찰을 위한 무선 신호의 주파수 영역 해상도 향상

  • Hong, Yerin (Department of Electronics and Communication Engineering, Kwangwoon University) ;
  • Oh, Hyukjun (Department of Electronics and Communication Engineering, Kwangwoon University)
  • Received : 2017.09.10
  • Accepted : 2017.10.09
  • Published : 2017.12.31
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Abstract

There are many research to find not only user data but also physical information about objects or human in radio signals. And we can obtain physical information from the wireless signals such as RSSI (Received Signal Strength Indicator), Doppler frequency and other values. For example, the Doppler frequency is generated by the object moving physically in wireless signals used for communication. By analyzing the Doppler frequency, the moving speed and direction of the object can be predicted. In this paper, we study the previous research which is to detect the moving objects or human using wireless signals, 802.11a signals. We introduce and verify the method to improve the frequency domain resolution of commercial 802.11a receivers to observe the doppler frequency and obtain the information of the moving objects or human.

사용자 데이터뿐만 아니라 무선 신호에 담긴 물체 혹은 사람에 대한 물리적인 정보를 알아내기 위한 활발한 연구가 진행 중이다. RSSI, 도플러 주파수 등 무선 신호에서 얻을 수 있는 값들을 이용하여 물리적인 정보를 알아낼 수 있다. 예를 들어, 통신을 위해 사용되는 무선 신호에는 물리적으로 이동하는 물체에 의해 도플러 주파수가 발생한다. 도플러 주파수를 분석하면 물체의 이동 속도와 방향을 예측할 수 있다. 본 논문에서는 무선 신호로 802.11a 신호를 사용하고 무선 신호에서 움직이는 물체 혹은 사람을 알아내기 위한 선행 연구를 진행하였다. 움직임에 의해 발생하는 도플러 주파수를 관찰하여 움직임에 대한 정보를 알아내고자 802.11a 수신기의 주파수 영역 해상도를 향상시키는 방법을 소개하고 검증한다.

Keywords

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