This paper reports on a power-delay profile measurement campaign emulating a mobile vehicle-to-infrastructure urban-highway environment. The measured location is in the city of Brno, Czech Republic. Utilizing a correlative 50 GS/s time-domain channel sounder with a center frequency of 59.6 GHz and 8 GHz bandwidth and with open-ended WR15 waveguide antennas, we characterize the representative millimeter wave radio channels in terms of the RMS delay spread and its variability caused by mobile scatterers (i.e., vehicles). The RMS delay spread exhibits notable heteroscedasticity as its standard deviation can decrease by 40%. The measured high resolution power-delay profiles exhibit clustering behavior, where a typical number of reflected multipath components is four to five.

In the recent twenty years, numerous IEEE 802.11 technologies have been developed for Wireless Local Area Network (WLAN) connectivity. The common point of these technologies is that the latest IEEE 802.11 version has always several advanced features compared to its predecessor. IEEE 802.11ax is one of the upcoming technologies, primarily developed for the Industrial, Security and Medical (ISM) band. IEEE 802.11ax is planned to be released in 2019 and extend the features of IEEE 802.11ac. This paper presents a simulation-based performance analysis of the IEEE 802.11ac/ax technologies on the physical layer (PHY) level. The transmitter and receiver models of both technologies have been implemented and tested in MATLAB. Furthermore, this work explores IEEE 802.11ac/ax performance degradation that may be caused by carrier frequency offset (CFO). Results show lower resistance of IEEE 802.11ax against CFO.

The increasing demand for high data rate in broadband mobile and wireless networks pushes providers to effectively utilize a wide range of radio frequency (RF) spectrum, especially in the unlicensed bands. The expansion of Long Term Evolution (LTE) telecommunication services in the license-free GHz bands can result in unwanted coexistence scenarios with the Wireless Fidelity (Wi-Fi) networks. This paper deals with the study of such scenarios in the 2.4GHz Industrial, Scientific and Medical band. The robustness of the LTE system against interferences is evaluated at the physical layer level. For this purpose, error vector magnitude (EVM) and carrier-to-interference (C/I) values are measured and calculated, respectively. The results of laboratory measurements show that the robustness of the LTE system is highly depending on the specific IEEE 802.11 technology used in the interfering Wi-Fi network.

During the last World Radiocommunication Conference it was decided that the upper frequency parts of UHF bands (700 MHz and 800 MHz) shall be released for mobile services, provided by Long Term Evolution (LTE) system. This decision has caused coexistence issues between the 2nd generation digital terrestrial video broadcasting (DVB-T2) and the LTE systems. In this paper, the impact of LTE-downlink (LTE-DL) RF signals on the DVB-T2 system with different configurations is explored. The most important DVB-T2 parameter set, namely code rate, modulation, OFDM mode, guard interval and pilot pattern, applicable for portable indoor TV reception, are taken into account. In addition, possible IQ-imbalances are considered. Adjacent band coexistence scenarios (different LTE signal bandwidths and data loads) are assumed, according to the first digital dividend band frequency. Overall DVB-T2 system performance, influenced by LTE-DL, is evaluated by the protection ratio (PR) parameter. The obtained laboratory results extend the current state-of-the-art knowledge in this field and show that several DVB-T2 system options from the viewpoint of interfering LTE signal have an inconsiderable impact on the DVB-T2 system performance.