Evaldas Stankevicius

Analysis on Interference Impact of Wi-Fi on Digital Terrestrial Television Broadcasting

Transition from Analogue Terrestrial Television Broadcasting to Digital Terrestrial Television Broadcasting DTTB in the 470-862 MHz band made available amount of spectrum so-called digital dividend for other services i.e. 790-862 MHz band 800 MHz to mobile service. Recently the 694-790 MHz band 700 MHz was also allocated to mobile service in ITU Region 1. Spectrum allocated to a broadcasting service but not used locally is called as TV white spaces TVWS. It is possible to introduce TVWS services in 470-790 MHz band under the condition that other services in this band already operating, or planned in the country and in neighboring countries, are adequately protected and this use does not violate the current ITU Radio Regulations. TVWS under some conditions locally could be used for mobile communication systems e.g. unlicensed Wireless Fidelity Wi-Fi using cognitive radio. As TVWS are located in the UHF band, the use of TVWS can provide significantly better coverage and wall penetration inside buildings than 2.4 GHz and 5 GHz range Wi-Fi frequencies. The exact amount of available spectrum for TVWS at any location will be dependent upon each country national situation e.g. DTTB planning configuration, other services use in the band. In case of deploying Wi-Fi in the TVWS the interference impact of Wi-Fi on DTTB has to be taken into account. The aim of this paper is to analyze the interference impact of Wi-Fi on DTTB. In this paper the interference occurring probability in DTTB receiver was evaluated by using Spectrum Engineering Advanced Monte-Carlo Analysis Tool SEAMCAT.

FBMC Modulation as a Possible Co-existence Facilitator for LTE Mobile Networks in 800 MHz Band

ABSTRACT This paper proposes filter bank multicarrier transmission technique (FBMC) as means to minimize adjacent band interference from long-term evolution (LTE) user equipment operating in the frequency band 792–862 MHz to short-range devices in the band 863–870 MHz. Main FBMC benefits are presented through comparison with reference case of orthogonal frequency-division multiplexing. The key advantage of FBMC modulation in reported electromagnetic compatibility studies is derived from its low out-of-band leakage, which guarantees minimum harmful interference level between stations using adjacent channels. The problem was evaluated in two aspects: first, theoretical analysis using minimum coupling loss method, complemented with statistical Monte-Carlo analysis (using SEAMCAT software tool) in order to verify results obtained in theoretical approach.

Evaluation of LTE 700 and DVB-T and DVB-T2 electromagnetic compatibility for co-channel case

The 2012 World Radiocommunication Conference (WRC-12) allocated the 694- 790MHz (700 MHz) band for the mobile service on a co-primary basis with other services including digital terrestrial television service in Region 1. Countries of Region 1 will also be able to continue the use of these frequencies for their digital terrestrial television services. This allocation of mobile service in Region 1 in 700MHz band became effective after the WRC-15. The objective of this article is to assess the electromagnetic compatibility of mobile broadband (LTE) and Digital Video Broadcasting-Terrestrial (DVB-T and DVB-T2) operating both in 700MHz band. The study contains an assumption of a preferred frequency division duplex (FDD) channelling arrangement which contains confined 2×30MHz block: 703-733MHz (uplink) and 758-788MHz (downlink). The model consists of two elements, LTE network and DVB-T/DVB-T2 (DVB-T/T2) system. Co-channel scenario was analyzed in this paper, and possible impact of LTE base stations to DVB-T/T2 fixed outdoor reception receivers. The Minimum Coupling Loss (MCL) method and Monte Carlo simulation within SEAMCAT software was used for interference analysis. The MCL method was chosen to show single interferer scenario of LTE base station, the GE06 predetermined trigger field strength value was also used in this study. The Monte Carlo simulations investigated cumulative effect of LTE network. During simulations the propagation model was used Recommendation ITU-R P.1546-5. The results obtained provide the minimum coupling distance required between LTE and DVB-T and DVB-T2 in the 700MHz band to maintain the necessary performance level of the DVB-T/T2 systems.

Electromagnetic Compatibility Studies: LTE BS vs. Aeronautical Radionavigation Services in 694-790 MHz Frequency Band

Abstract This paper presents the sharing analysis of the 694–790 MHz frequency band for Mobile services IMT and Aeronautical radio-navigation services (ARNS) using SEAMCAT (established by CEPT) software based on the statistical simulation (Monte-Carlo) method. In 2012 the World Radiocommunication Conference (WRC-12) decided to allocate the 694–790 MHz frequency band (the so-called 700 MHz band) to mobile services IMT (excluding aeronautical mobile) after WRC-15 conference. But this agreement raises electromagnetic compatibility problems, which should be solved until WRC-15 [1]. This study was carried out in two phases: first applying theoretical analysis, then statistical Monte-Carlo simulations with SEAMCAT software tool in order to verify results obtained in theoretical approach. Analytical calculations shows that the required protection distances between ARNS stations and the MS base stations are 132 km. The obtained results from SEAMCAT simulations indicate that separation distance should be above 100 km. These results illustrate that the systems are not electromagnetically compatible. The possible mitigation technic could be antenna pattern correction.