Conference Paper

Time Domain Measurements in automotive applications

emv GmbH, Taufkirchen, Germany
DOI: 10.1109/ISEMC.2009.5284604 Conference: Electromagnetic Compatibility, 2009. EMC 2009. IEEE International Symposium on
Source: IEEE Xplore

ABSTRACT Time Domain Measurements are required to analyze and interpret transient disturbing RF signals. In the area of future automotive applications, transient RF disturbances are becoming critical because comfort options like Bluetooth connection, external devices with complex integrated RF functionality (automotive WLAN, UMTS, GSM, WCDMA, MIMO devices, multiband smart phones, Net-books) have to interface with integrated car entertainment and control systems. Due to the technical concept of such wireless communication networks with digital modulation schemes, the interferences are often short events with transient characteristics. The detection and reproducible measurement of such signals is difficult because of missing trigger signals and can be performed today with Time Domain Measurement Systems using fast A/D converters, digital filters and the Fourier Analysis to transform the measured data into the frequency domain.

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    • "According to [14], the power level of the interferer to avoid a false wake-up of the OBU should be below approximately 0 dBm. However, the power levels of the interferers from wireless local are networks (WLANs), mobile phones, and Bluetooth reaches up to 13 dBm [15] near the OBU. These interferers are transmitted as signals with amplitude variations based on two different mechanisms: an AM signal caused by the peak-to-average power ratio (PAPR) in active-mode operation and an on–off-keying (OOK) signal caused by their time-division transmit–receive operation. "
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    ABSTRACT: This paper presents a fully integrated 5.8-GHz dedicated short-range communication transceiver with a 10-A interference-aware wake-up receiver (WuRx) for Chinese elec-tronic toll collection system terminals that can operate with a low standby and operating current consumption. To reduce the current consumption, a high-gain RF envelope detector using a voltage-boosting method is proposed for both the WuRx and receiver (Rx) while the proposed high-power ASK modulator extends output dynamic range in low power consumption. Ad-ditionally, a delay-based bandpass filter is adopted in the WuRx to filter out interference from automotive applications, thus in-creasing the battery lifetime by reducing the probability of a false wake-up. The proposed transceiver is fabricated using 0.13-m CMOS technology with a chip size of 2.8 mm for the target frequency range of 5.8 GHz. The measured results demonstrate sensitivities of 44 and 61 dBm for the WuRx and Rx, dissi-pating currents of 10 A and 19 mA from 3.3-V supply voltage, respectively. The transmitter exhibits a normal output power of 5 dBm at an operating current of 46 mA. Index Terms—CMOS integrated circuits (ICs), dedicated short-range communication (DSRC), electronic toll collection system (ETCS), interference suppression, radio transceiver, wake-up receiver (WuRx).
    IEEE Transactions on Microwave Theory and Techniques 10/2014; 1(12). DOI:10.1109/TMTT.2014.2362118 · 2.94 Impact Factor
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    • "According to [14], the power level of the interferer to avoid a false wake-up of the OBU should be below approximately 0 dBm. However, the power levels of the interferers from wireless local are networks (WLANs), mobile phones, and Bluetooth reaches up to 13 dBm [15] near the OBU. These interferers are transmitted as signals with amplitude variations based on two different mechanisms: an AM signal caused by the peak-to-average power ratio (PAPR) in active-mode operation and an on–off-keying (OOK) signal caused by their time-division transmit–receive operation. "
    [Show abstract] [Hide abstract]
    ABSTRACT: This paper presents a fully integrated 5.8-GHz dedicated short-range communication transceiver with a 10-A interference-aware wake-up receiver (WuRx) for Chinese elec-tronic toll collection system terminals that can operate with a low standby and operating current consumption. To reduce the current consumption, a high-gain RF envelope detector using a voltage-boosting method is proposed for both the WuRx and receiver (Rx) while the proposed high-power ASK modulator extends output dynamic range in low power consumption. Ad-ditionally, a delay-based bandpass filter is adopted in the WuRx to filter out interference from automotive applications, thus in-creasing the battery lifetime by reducing the probability of a false wake-up. The proposed transceiver is fabricated using 0.13-m CMOS technology with a chip size of 2.8 mm for the target frequency range of 5.8 GHz. The measured results demonstrate sensitivities of 44 and 61 dBm for the WuRx and Rx, dissi-pating currents of 10 A and 19 mA from 3.3-V supply voltage, respectively. The transmitter exhibits a normal output power of 5 dBm at an operating current of 46 mA. Index Terms—CMOS integrated circuits (ICs), dedicated short-range communication (DSRC), electronic toll collection system (ETCS), interference suppression, radio transceiver, wake-up receiver (WuRx).
    IEEE Transactions on Microwave Theory and Techniques 01/2014; 1. · 2.94 Impact Factor
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    • "On the other hand, time domain EMI (TDEMI) measurement systems provide some capabilities that could never be achieved using their frequency domain counterpart like: improvement of impulsive emissions measurements, reduction of the measurement time, noise cancelation capability, as well as time domain visualization of the EMI signals. Nevertheless, there are two problems of the current time domain EMI measurement approaches: the limited dynamic range as well as the limited depth of memory to store a sufficient set of time domain data [10] [17] "
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    ABSTRACT: Electromagnetic interferences (EMI) are the principal pollutant source in electrical vehicles. Current automotive electromagnetic compatibility (EMC) standards don’t discuss the effect of the driving profile on real traffic vehicular radiated emissions. This paper introduces a methodology to evaluate the radiated emissions of electric motorcycles in terms of the driving profile signals in noisy environments. A time domain EMI measurement system with two antennas in the setup has been used to measure the temporal evolution of the radiated emissions in a semi-anechoic chamber. The velocity of the motorcycle was controlled by a remote laptop connected to the motorcycle via a CAN bus. The electromagnetic noise generated by the CAN bus has been cancelled using frequency domain adaptive filtering techniques.
    European Electric Vehicle Congress (EEVC); 11/2012
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