Tomas Kratochvil

DVB-T and DVB-T2 performance in fixed terrestrial TV channels

This paper deals with the DVB-T (Digital Video Broadcasting-Terrestrial) and DVB-T2 (DVB-2nd Generation Terrestrial) standards and their transmission performance in fixed TV channels. For the analysis and simulation of performance of both standards, classical Ricean and Rayleigh multipath fading channels with 20 independent paths were used. Simulation results of the BER (Bit Error Ratio) before and after FEC (Forward Error Correction) decoding were evaluated and compared for DVB-T and DVB-T2 standards. Dependences of MER (Modulation Error Ratio) on C/N (Carrier-to-Noise Ratio) were also obtained for both standards. Moreover, optimal configuration of the new DVB-T2 system for broadcasting of HDTV (High Definition Television) services was explored. Appropriate applications for these simulations were developed in MATLAB. Finally, achieved results are evaluated and clearly discussed.

Hierarchical Modulation in DVB-T/H Mobile TV Transmission

This paper deals with the utilization of a hierarchical modulation in the DVB-T/H standard and transmission of the digital terrestrial television over models used as fading channels for the fixed, portable and mobile reception. The laboratory transmission system for the digital TV broadcasting and used R&S test and measurement equipments are shortly presented including the experimental transmission setup. The results of experimental DVB-T/H broadcasting over fading channels without and with introduced Doppler shift are presented. The BER before and after Viterbi decoding and according MER equal to SNR ratio in the fading channels were compared in all transmission experiments.

DVB-H and DVB-SH-A performance and evaluation of transmission in fading channels

This paper deals with the examination of the transmission distortions of the standards DVB-H and DVB-SH-A in portable and mobile TV over fading channels. These channel profiles introduce and respect Doppler shift. Appropriate applications for this simulation (DVB-H and DVB-SH-A transmission) were developed in MATLAB. Simulation results of the BER after Viterbi decoding (DVB-H) and after turbo decoding (DVB-SH-A) were obtained and compared. Dependences of MER on C/N for QPSK and 16QAM modulations were obtained for both standards. Finally, achieved results were evaluated and discussed.

Exploring of the DVB-T/T2 performance in advanced mobile TV fading channels

The second generation terrestrial standard DVB-T2 has a more flexible approach of the system parameters for the mobile and portable digital television broadcasting then DVB-T. This paper deals with the exploring of the DVB-T/T2 transmission performance in advanced mobile television channel models. For the analysis and simulation there were used advanced mobile fading channel models called Vehicular Urban and Motorway Rural that respects fast moving receiver in a car and Doppler shift. Detailed dependences of the bit error ratio before and after channel decoding and according modulation error ratio on the carrier-to-noise ratio are the main results of this work. Applications for the exploring of DVB-T/T2 performance were completely created in MATLAB. In advance, the results of the simulations were completely verified on real measurement data to be sure about their validity.

Comparison of H.265 and VP9 coding efficiency for full HDTV and ultra HDTV applications

This paper presents a performance comparison of the two modern video coding standards H.265/HEVC and VP9. For such comparison, the latest available versions of codecs for encoding were used. Comparison is provided by set of objective quality metrics. Comparing of coding efficiency is evaluated for Full HDTV and also for Ultra HDTV. Results indicate a dominance of HEVC encoding algorithm in comparison to VP9 if bit rates are set to higher values. In low bitrates results are both codecs very balanced with small dominance of VP9.

Hierarchical modulation in DVB-T/H mobile TV transmission over fading channels

This paper deals with the utilization of a hierarchical modulation in the DVB-T/H standard and transmission of the digital terrestrial television over models used as fading channels for the fixed, portable and mobile reception. The laboratory transmission system for the digital TV broadcasting and used R&S test and measurement equipments are shortly presented including the experimental transmission setup. The results of experimental DVB-T/H broadcasting over fading channels without and with introduced Doppler shift are presented. The BER before and after Viterbi decoding and according MER equal to SNR ratio in the fading channels were compared in all transmission experiments.

Exploring and Measuring Possible Co-Existences between DVB-T2-Lite and LTE Systems in Ideal and Portable Fading Channels

From the point of technical innovations the development and standardization of Digital Video Broadcasting - 2 nd Generation Terrestrial (DVB-T2) and Long-Term Evolution (LTE) systems are definitely the most significant results in the last decade. These systems have a very high potential to fulfill the highest user requirements, but they can operate in the same frequency spectrum. As a result, different co-existence scenarios can occur. In this paper, we explore and measure the co-existence between DVB-T2-Lite (e.g. portable TV) and LTE multimedia services in ideal and portable fading channel models. Theoretical backgrounds of the investigated co-existence scenarios, proposal and realization of an appropriate workplace for their measuring and evaluation are presented and described. Moreover, deeper investigation of the mutual influence of the DVB-T2 system on the LTE one is also explored and graphically illustrated. The obtained results show that these co-existences could be critical for both systems from the point of providing multimedia services with a constant level of Quality of Services (QoS).

Measurement of the DVB-T2 with 256QAM rotated constellation and 32K extended mode in relation to variable pilot patterns

Second generation digital terrestrial television broadcasting, in this paper represented by the DVB-T2 standard, has a more flexible approach of the system parameters by defining up to eight pilot patterns. Selection of the best pattern and related DVB-T2 system parameters can be adjusted in a real broadcasting network based on operator demands. This paper deals with exploring of the DVB-T2 system performance in different transmission channels and evaluates its dependence on the type of the pilot pattern used towards real DVB-T2 terrestrial network implementation. A fixed reception scenario of broadband multimedia system services is considered with HDTV video image quality for a very convenient 256QAM rotated constellation and 32K extended mode. Several terrestrial channel models are also respected, like reference Gaussian channel and standardized Ricean and Rayleigh fixed fading channels with 20 echo paths and variable delays. Dependences of the bit error rates before and after a highly efficient LDPC decoding and consequent modulation error on the carrier-to-noise ratio for different pilot patterns are the main results of our work. Finally, our experimental results are compared with the simulated and theoretical values from the ETSI standard to be sure about their validity.

From analog to Digital Television — the common way how to digitize European broadcasting

This paper deals with the origin, history, present and future of the DTV (digital television) in the Europe. It introduces DVB (digital video broadcasting) project that creates global standards for digital television since 1991. Fundamental European standards for DVB provides transmission of DTV (digital television) via three transmission media - DVB-S (satellite), DVB-C (cable) and DVB-T (terrestrial) channels. These standards are in the paper described with the according depth. With the development of HDTV (high definition TV), IPTV (Internet protocol TV), mobile TV using DVB-H (handheld) and interactive data broadcasting using DVB-MHP (multimedia home platform) the new approaches to DTV broadcasting are outlined. This paper contains compiled information from the DVB project webpage, DVB fact sheets, standards ETSI (European Telecommunications Standards Institute) and EBU (European Broadcasting Union) and Internet resources to present the DVB as a real ldquomilestone in digital communicationsrdquo. All used resources are properly quoted in references list.

Coexistence Between DVB-T/T2 and LTE Standards in Common Frequency Bands

In the last decade, fulfilling the growing users’ expectations on the quality of provided multimedia services is one of the biggest challenges for different wireless communication systems. However, many times, different kinds of wireless systems can operate in the same (shared) frequency band. Such coexistence generally negatively affects the performance of the systems colliding. This is especially true for the widely used Digital Video Broadcasting-Terrestrial (DVB-T) or upcoming DVB-2nd Generation Terrestrial (DVB-T2) and Long-Term Evolution (LTE) standards, operating in Europe. Hence, the aim of this paper is to explore the impact of interfering mobile telecommunication services on the mobile TV services provided by LTE and DVB-T/T2 systems in the same frequency band. For the simulation of the coexistence between the LTE and DVB-T/T2 services on the physical layer level, an appropriate method is proposed and complex simulation tools are coupled. The results, presented as a dependence of modulation error ratio at the receiver input and bit error ratio at the channel decoder input on the spectral level ratio, show comparable performances for DVB-T and DVB-T2 systems. Results from simulations are verified by laboratory measurements and should help to better understand the influence of co-channel interferences from LTE mobile networks on DVB-T/T2 networks for mobile transmission scenarios.