Abstract
The Tire Pressure Monitoring System (TPMS) displays the state of a tire on a display to inform a driver of the relevant information, by means of a sensor installed on the tire of the vehicle. When the data measured from the tire are wirelessly transmitted to a receiving antenna located in the center of the vehicle, the exact transmission of data is affected by the interference from various external electronic and electrical devices. In this paper, we suggest a minimum variance distortionless response (MVDR) beamformer based on the angle-of-arrival (AOA) vector for suppressing external interference and receiving accurate data. Although the MVDR beamformer effectively suppresses the interference, it has high computational complexity because of the calculation of an autocorrelation matrix. In order to address this issue, we also suggest a generalized sidelobe canceler (GSC) beamformer which does not have the same performance of the interference suppression to MVDR but also has low computational complexity. Since the signal from each tire can cause interference to others, we consider utilizing a unique Gold Code to each tire to minimize intertire interference and reduce power consumption of a battery installed in each tire.
Highlights
If air pressure of a tire is too high or low compared with a reference pressure, it is likely to cause a serious accident
Since Tire Pressure Monitoring System (TPMS) utilizes wireless communication technology, the serious interference occurs from the external electrical and electronic devices using the similar frequency to the TPMS frequency
We suggested an minimum variance distortionless response (MVDR) beamformer for TPMS, which has excellent performance of interference suppression
Summary
If air pressure of a tire is too high or low compared with a reference pressure, it is likely to cause a serious accident. The TPMS is a system for measuring the temperature and pressure of each tire by means of the installed sensor to transmit the measured data to the central processing unit (CPU) in the vehicle in order to prevent the accident [1,2,3]. The interference signal with the high power from external devices should interfere with exact transmission and reception of the TPMS data For suppressing such interference, we suggest AOA vector-based MVDR beamformer with excellent performance. For applying the beamformer suggested in this paper to the TPMS, a transmission antenna and a sensor are installed in each tire, and M antennas are arranged in the center of the vehicle in a line.
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