Waveform Approach for Assessing Conformity of CISPR 16-1-1 Measuring Receivers

An alternative approach for assessing the conformity of electromagnetic interference measuring receivers with respect to the baseline CISPR 16-1-1 requirements is proposed. The method’s core is based on the generation of digitally synthesized complex waveforms comprising multisine excitation signals and modulated pulses. The superposition of multiple narrowband reference signals populating the standard frequency bands allows for a single-stage evaluation of the receiver’s voltage accuracy and frequency selectivity. Moreover, characterizing the response of the weighting detectors using modulated pulses is more repeatable and less restrictive than the conventional approach. This methodology significantly reduces the amount of time required to complete the verification of the receiver’s baseline magnitudes, because time-domain measurements enable a broadband assessment while the typical calibration methodology follows the time-consuming narrow band frequency sweep scheme. Since the reference signals are generated using arbitrary waveform generators, they can be easily reproduced from a standard numerical vector. For different test receivers, the results of such assessment are presented in the 9 kHz–1 GHz frequency range. Finally, a discussion on the measurement uncertainty of this methodology for assessing measuring receivers is given.Postprint (author's final draft

The stochastic elementary formula method and approximate travelling waves for semi-linear reaction diffusion equations

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Resilience of QPSK Radio Links Under Narrowband and Broadband Electromagnetic Interferences

Electromagnetic interference has the potential to affect the functionality and performance of radio communication links. This work investigates the impact electromagnetic disturbances have on such wireless links, taking quadrature phase-shift keying (QPSK) as a representative example. The evaluation of the effects of interference on a QPSK radio link becomes relevant as it is used by the IEEE 802.11b protocol. Through simulations, we study a QPSK link subjected to narrowband and broadband disturbances. The bit error rate (BER) and the error vector magnitude (EVM) are our quality assessment metrics for evaluating the system. Two specific scenarios are analyzed: continuous wave and chirp interferences as in-band and out-band conditions. The results indicate that the applied electromagnetic interference can degrade the signal quality, resulting in high BER. Furthermore, it is observed that chirp interference largely affects the radio links more than continuous wave disturbances. The aforementioned findings support and reinforce the applicability of the analysis methodology in real-life scenarios like those characterizing healthcare settings