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1National Institute of Information and Communications Technology, Japan; 2Aoyama Gakuin University, Japan
In this paper, we compare the characteristics of impulse noise models from the viewpoint of interference evaluation in a coded digital communication system with the noise radiated from LED bulbs. In particular, the noises in a time series are simulated with the estimated parameters from measured data using the Middleton class A model, the Markov-Middleton model, and the proposed model which use a duration distribution at a Markov state of noise process. It is verified that the proposed model provides a property of the actual LED noise by analyzing the statistical characteristics of the durations of the simulated and measured noises. Furthermore, the bit error rate (BER) simulation is performed for comparison with the capability of the proposed and existing models in terms of the interference evaluation in a coded digital communication system. In a basic coded QPSK system used in this paper, the BER performance by using the proposed model indicates a similar tendency to that by the measured noise in comparison with the existing models. Results showed that the duration distribution is important for the evaluation of performance degradation of interfered coded system and the proposed model has sufficient possibility to be modeled of the actual LED noise.
Interference Impact from Solar-Panel Systems on Air Traffic Control Communications
Peter Frank Stenumgaard, Sara Linder
Swedish Defence Research Agency (FOI), Sweden
The use of solar panel-systems is rapidly increasing and some of these systems are co-located in the vicinity of wireless systems. Measurements have shown that the radiated emission from solar-panel electronics can reach considerable levels, in some cases even above CISPR 22 Class B. In this paper, the interference consequences on air traffic control communications have been investigated for different co-location distances between solar-panel systems and communication antennas. The results show that considerable interference impact, in terms of reduced communication range and increased receiver-noise level, can be caused by radiated interference from solar panels at co-location distances of 20-30 meters and below. The overall conclusion is that co-location of solar-panel systems with air traffic control communications, must be carefully analyzed not to create safety and security problems on airports.
On the Impact of CW interference on 5G NR
Karina Fors, Erik Axell, Sara Linder, Peter Stenumgaard
Swedish Defence Research Agency, Sweden
Orthogonal frequency division multiplex (OFDM) is used in several modern wireless systems, for example in the fourth generation mobile system LTE (long term evolution), the wireless local area network (WLAN) standard IEEE 802.11, digital audio broadcasting (DAB) and digital video broadcasting (DVB). OFDM has also recently been included in the standard for the fifth generation mobile system, 5G.
In this work, we analyze the vulnerability of 5G NR to different types of continuous wave (CW) interference, both a single CW signal or several synchronized CW signals. The analysed system includes OFDM and error correction by LDPC codes, with parameters chosen to resemble those of the 5G NR release 15 standard. An important conclusion of this work is that the 5G NR system is significantly more sensitive to CW interference than to white Gaussian noise. To improve the robustness against CW interference, different types of limiters on the received signal are also evaluated. Limiters in the frequency domain are shown to mitigate the impact from a single CW signal significantly. For an interfering signal consisting of several CW signals, a limiter in the time domain can reduce the impact of the interference signal so that its impact is below that of Gaussian noise with the same power.
Improved Electromagnetic Compatibility Standards for the Interconnected Wireless World
Marc Pous, Marco A. Azpurua, Ferran Silva
Universitat Politècnica de Catalunya, Spain
The future is wireless, a world where everything is interconnected. However, the current standards for ensuring the electromagnetic compatibility (EMC) and the coexistence of such wireless systems urge for a major update. It is shown how novel statistical approaches based on the amplitude probability distribution detector and time-domain measurements are better suited for estimating the degradation caused by electromagnetic interferences on digital communication systems than the established practice of determining compliance according to the quasi-peak detector levels using a pass/fail criterion. Therefore, a redefinition of the test methods and of the compliance requirements in terms of EMC standards must be a priority of the international standardization bodies. Finally, a discussion of the fundamental challenges involved in this standardization breakthrough for EMC is delivered.