Multiple-input multiple-output (MIMO) systems operating at frequencies in the upper VHF and lower UHF region is attractive for peer-to-peer communication applications where robustness of high importance, e.g., tactical networks emergency response systems. When designing evaluating such systems, knowledge realistic propagation conditions required. This paper presents results from an urban MIMO measurement campaign 300 MHz. Measurements are performed along 25 receiver routes three fixed...

Measurements of both conducted and radiated emissions from solar panel installations have been performed. Emissions photovoltaic systems previously disrupted radio communication the purpose measurements was to map how can occur. Conducted were measured for frequencies 10kHz – 200 MHz emission 10 kHz 1 GHz. carried out with inverters in facilities on off. The showed that even if inverter is switched off, there are signals system. When on, a number characteristic generated which repetitive...

Orthogonal frequency division multiplex (OFDM) is used in several modern wireless systems, for example the fourth generation mobile system LTE (long term evolution), local area network (WLAN) standard IEEE 802.11, digital audio broadcasting (DAB) and video (DVB). OFDM has also recently been included fifth system, 5G.In this work, we analyze vulnerability of 5G NR to different types continuous wave (CW) interference, both a single CW signal or synchronized signals. The analysed includes error...

In this paper a method for calculating the impact of intersystem interference between frequency hopping systems is proposed. The results are given in form average bit error probability over all frequencies used by system. includes both transmitter spectrum with sidebands and receiver selectivity sidebands. Furthermore, effects from partially overlapping bands included model. A strength model that it can be generalized to an arbitrary number interfering systems. Moreover, addition systems, on...

On military camps for joint international operations, the intersystem interference can be highly unpredictable, and situation changes occur very fast. For such situations it is important to perform analyses not only intentional transmitters but also electromagnetic from other electric equipment. One example of an source consider medical equipment in field hospitals since contain a large amount interfering In this article, we show examples necessary safety distances between tactical radio...

Interference between frequency hopping (FH) systems sharing the same band can decrease communication performance. The be severe, especially for on platform or in vicinity of each other. stem both from channel momentarily adjacent channels. It is shown that a devastating high error floor appear when several FH are using and special considerations system coexistence overlooked. Here, effects with without interference. Some strategies to interference, i.e. optimal sequences isolation, also...

Increasing capacity demands for military services implies more wideband networks claiming frequency spectrum. In combination with the scarcity of spectrum, this yields an increased risk inter-network interference. Cooperative relaying, here in form synchronized cooperative broadcast (SCB), is a robust technique. The technique currently being integrated into state-of-the-art tactical radios. However, simultaneous transmissions may cause severe interference situation. objective paper to...

The use of solar panel-systems is rapidly increasing and some these systems are co-located in the vicinity wireless systems. Measurements have shown that radiated emission from solar-panel electronics can reach considerable levels, cases even above CISPR 22 Class B. In this paper, interference consequences on air traffic control communications been investigated for different co-location distances between communication antennas. results show impact, terms reduced range increased...

Tactical military networks are often ad hoc since it is a highly robust solution. The data rate in ground-based limited due to low antenna heights and challenging wave propagation environment. In such can be hard achieve high enough support the requested services. A large portion of traffic tactical broadcast or multicast traffic. Often, used assumed same for all links tends order reach nodes network. possible solution improve capacity add an airborne node this paper, performance ground at...

Electromagnetic interference can cause severe degradation of the performance wireless communication systems. In order to predict or handle degradation, methods for calculating impact is needed. However, a system that subjected several impulsive sources, hard calculate exactly. addition, using standard approximations such as Gaussian approximation give large errors. this paper we present method evaluating in complex situations, only information be found from measurements. The estimated...

Determining the impact on digital communication systems from electromagnetic interference often requires complex analyses or computations. Therefore, there is a need for low-complexity approximate methods suitable in computer-based tools intersystem analyses. A commonly used approximation to treat as additive white Gaussian noise (AWGN), when estimating resulting bit error probability (BEP). However, validity of this varies different types interference. Previously, it has been shown that...

For tactical military communications, ad hoc networks are an attractive choice because they can provide good area coverage without the vulnerabilities of any central node or base station. Their performance is, however, strongly dependent on ability to maintain link quality information, and distribute changing routing tables, in a timely efficient manner highly mobile scenarios. A relatively new concept cooperative relaying, which several relay nodes simultaneously retransmits identical...

As a new application within the wireless power transfer (WPT) technique, stationary charging of vehicles is introduced. The technique goes under concept to electric (WPT-EV). For this purpose, frequency band 75–90 kHz can be used with means transmitting coil located in ground that transfers energy receiving vehicle floor. There risk WPT-EV may cause electromagnetic interference radio communication systems. To gain knowledge emission levels originated from station and character radiated...

On military platforms, several communication systems are colocated with electronic systems. The resulting electromagnetic environment can degrade performance. This is particularly evident in vehicles and other small where a lot of equipment installed space. A consequence high interference (EMI) levels reduced range for radio focus this article to analyze how complex situation affects frequency-hopping ad hoc networks using synchronized cooperative broadcast (SCB). SCB technique used by...

For wireless systems, interfering signals from the surrounding environment is a serious threat to performance of system. A measurement system with aim autonomously detect and log interference incidents, particularly in GPS bands, has been developed used collect data. Three systems were placed various locations at an international airport Sweden, have continuously recorded both background noise incidents on L1. In this paper, recordings measurements performed during one year, starting...

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 a scarce resource must be shared by several resulting risk for internetwork interference. The objective paper analyze effects from interference frequency-hopping (FH) networks. Earlier work show that performance on communication link can degraded between FH systems sharing same resource....

Co-location of frequency hopping systems occurs both in civilian and military applications. For close co-location such scenarios, out-of-band emissions can be significant importance therefore have to considered the analysis. Intersystem-interference analysis scenarios with several using a large amount frequencies complex time consuming if one wishes consider emissions. In this paper possible simplifications is suggested evaluated respect resulting bit error probability. Our results show how...

Co-location between digital radio systems and civilian electronic equipment can lead to severe interference problems. Unintentional radiated electromagnetic emission increase the bit error probability (BEP) in receiver, thus reduce range of secure operation. Furthermore intersystem causes a reduction jamming resistance. In this paper, corresponding decrease operating compensate for BEP is determined Furthermore, hostile jammer chosen example. The results are visualized as simulated coverage...

In this paper we present a low-complexity method for estimating the impact of intersystem interference on digital radio systems. For receiver, bit error probability (BEP) is widely used measure receiver's performance. However, computations necessary to determine BEP, caused by electromagnetic interference, are often quite complicated. Hence, simplified methods needed in computer-based tools analysis. One such approximate interfering signal as additive white Gaussian noise (AWGN)....