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Traffic in military ad hoc networks are often broadcast or multicast traffic. A robust and efficient way to handle this type of traffic is the multi-point-relay (MPR) method. Furthermore, frequency spectrum is a scarce resource and must often be shared by several networks resulting in a risk for internetwork interference. The objective of this paper is to analyze the effects from internetwork interference...
Electromagnetic interference can cause severe degradation of the performance of wireless communication systems. In order to predict or handle the performance degradation, methods for calculating the impact of the interference is needed. However, for a communication system that is subjected to several impulsive interference sources, the performance is hard to calculate exactly. In addition, using standard...
Several frequency hopping systems can share the same frequency band using different hopping patterns. However, the risk of interference increases when there are few frequencies in the band and increases further for close co-location and out-of-band emissions from the transmitter. In this paper, we use a statistical method to analyze the impact of interference from a co-located FH system. Different...
Interference in the vicinity of wireless systems can cause serious degradation on radio communication performance. This may even result in disruptions and lost calls for communication systems or none or incorrect position for Global Navigation Satellite System (GNSS) receivers. For this purpose, a measurement system has earlier been developed with the aim to detect and log interference incidents....
Today, wireless communication systems are used for many vital applications. As a consequence of the networked society and an increased use of electronical equipment, the interference environment and the man-made noise can be foreseen to increase in signal level. This is in particularly evident at vehicles and other small platforms, where a lots of equipment is gathered on a small area. The interference...
Interference in the vicinity of a receiving radio system can cause serious degradation of the radio communication performance. This may even result in disruptions and lost calls. Existing analysis tools to analyze interference problems in advance are often specialized at certain radio technologies or so complicated that they can only be used by experienced specialists. To foresee and prevent such...
The society is becoming more and more dependent on Long Term Evolution (LTE-services) in a large variety of applications, which is why we must ensure it is secure and available when we need it. Like any wireless technology, it is vulnerable to radiated electromagnetic interference. In this paper, we show how the levels of standard radiated emission limits will affect the performance of LTE. The results...
Wireless technologies for critical societal functions is becoming more common today. Criminals have already recognized this vulnerability and used it in various types of crimes. Unintentional radiated electromagnetic interference can also be a big problem for these types of services. Before deployment of critical societal functions based on wireless technologies, mapping and analysis of the electromagnetic...
Tactical military networks are often ad hoc networks since it is a highly robust solution. The data rate in ground-based networks is often limited due to low antenna heights and a challenging wave propagation environment. In such networks it can be hard to achieve high enough data rate to support the requested services. A large portion of the traffic in tactical networks is broadcast or multicast...
The rapidly increasing use of wireless technology in critical systems has led to an increased vulnerability to radio interference. Radio interference is produced both naturally of all electronic systems but also through illegal jammers currently sold at low cost via the Internet. To continuously monitor the radio noise environment in critical systems are becoming increasingly important and in this...
Interference in the vicinity of a receiving radio system can cause serious degradation of the radio communication performance. This may even result in disruptions and lost calls. Existing analysis tools to analyze interference problems in advance are often specialized at certain radio technologies or so complicated that they can only be used by experienced specialists. To foresee and prevent such...
The IEEE 802.11p standard will in the next years be introduced for vehicle-to-vehicle and vehicle-to-infrastructure (V2X) communication. Some of the services in this standard are dedicated to active road safety applications and can therefore be sensitive to radio interference. Since the system is based on Automatic Repeat Request (ARQ) and Carrier Sense Multiple Access (CSMA), interference problems...
Interfering signals collocated to a radio communication system can degrade the system performance severely. To quantify this degradation by measuring the interfering signal is a difficult issue. Traditionally, the average interference power (the root mean square (RMS) value of the interfering signal) is measured and used as a measure of the impact on a digital radio receiver. However, it is well-know...
In this paper a method for calculating the impact of intersystem interference between frequency hopping systems is proposed. The results are given in form of the average bit error probability over all frequencies used by the system. The method includes both the transmitter spectrum with sidebands and the receiver selectivity with sidebands. Furthermore, the effects from partially overlapping frequency...
On military camps for joint international operations, the intersystem interference can be highly unpredictable, and situation changes can occur very fast. For such situations it is highly important to perform intersystem interference analyses not only for intentional transmitters but also for electromagnetic interference from other electric equipment. One example of such an interference source to...
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