Performance of new waveforms and non uniforms contellations applied to DVB-T2 transmissions

Appui à la mise en place d'un Master professionnalisant en photonique et en radiodiffusion numérique - PHORAN - Fédération Wallonie Bruxelle

Optimization of channel coding and modulation functions used in DVB-T2

Appui à la mise en place d'un Master professionnalisant en photonique et en radiodiffusion numérique - PHORAN - Fédération Wallonie Bruxelle

Low complexity demapping algorithms survey in DVB-T2: Rotated constellation case study

peer reviewedSignal Space Diversity (SSD) technique was adopted in Digital Video Broadcasting-Terrestrial, second generation (DVB-T2) standard ten years ago to increase system performance over fading channels. This technique consists of rotated and cyclic Q-delayed M-Quadrature Amplitude Modulation (QAM) and has been proposed without considering the complexity induced by the demapper. 'Genie Aided' demapping algorithm based on iterative demapping has been presented in DVB-T2 and lets this system approach the Shannon limit. Furthermore, this algorithm is not suitable for hardware implementation. Due to the complexity of the hardware implementation algorithms, the advantages of this rotated constellation have not been effectively exploited for network deployment. Moreover, receivers provided by manufacturers do not include suitable demappers when this technique is applied. Therefore, several low complexity algorithms have been proposed during the last decade in the scientific literature to reduce the number of metrics and operators used in the demapping process. This paper presents an exhaustive review of demappers proposed for DVB-T2 and all the low complexity demapping algorithms existing up to now in the literature that is suitable for hardware implementation. Details about these algorithms are given in terms of reduction, parameters, performance and percentage of reduction obtained.Appui à la mise en place d'un Master professionnalisant en photonique et en radiodiffusion numérique - PHORAN - Fédération Wallonie Bruxelle

Complexity analysis on 5G Candidate waveforms for DVB-T2: A survey

In this work, a literature review of filter-based waveforms proposed in the Digital Terrestrial Television (DTT) standard context improvement is presented. It also compares low complexity algorithms of Filter Bank Multicarrier (FBMC) and Universal Filtered Multicarrier (UFMC) applied to the next generation of Digital Video Broadcasting-Terrestrial, second generation (DVB-T2) system. As known, Orthogonal Frequency Division Multiplexing (OFDM) and both FBMC and UFMC have common characteristics like the use of Fast Fourier Transform (FFT) in their functional blocks diagram. However, the FBMC and UFMC are mainly based on different filtering operations, which induce a high implementation complexity but present a better performance in a broadcasting system when compared to the classical OFDM. Their computation complexity is studied to highlight the optimal low complexity algorithm. Furthermore, the compromise between FBMC and UFMC waveforms applied to DVB-T2 in terms of SNR performance gains, spectral efficiency, and complexity is established. This paper shows that UFMC is a good compromise as its complexity is reduced to the same complexity as OFDM while having advantages.Appui à la mise en place d'un Master professionnalisant en photonique et en radiodiffusion numérique - PHORAN - Fédération Wallonie Bruxelle

Techniques MISO Co-localisée et distribuée dans les réseaux monofréquence

Appui à la mise en place d'un Master professionnalisant en photonique et en radiodiffusion numérique - PHORAN - Fédération Wallonie Bruxelle

Amélioration des performances du système numérique de Radio Mondiale à l'aide de constellations non-uniformes

Appui à la mise en place d'un Master professionnalisant en photonique et en radiodiffusion numérique - PHORAN - Fédération Wallonie Bruxelle

Co-located and distributed MISO techniques in DVB-T2 Single Frequency Networks

In this paper, the impact of various diversity schemes of Alamouti Multiple Input Single Output (MISO) technique applied in Digital Video Broadcasting-Terrestrial second generation (DVB-T2) system has been evaluated. Indeed, DVB-T2 is now mature, and many studies have been done to improve its performance. MISO is an optional block integrated in this system standard to improve its performance depending on the propagation environment. In particular, Single Frequency Network (SFN) propagation constitutes an environment where the overlapping areas of transmitters suffer from destructive interference. Therefore, the advantage of diversity technique is exploited to improve the signal robustness in these areas. Co-located and distributed diversity topologies are foreseen to deploy MISO in DVB-T2 system. While the former supposes that transmitters are localized on the same site, the latter implements transmitters at distributed sites. In this work, the performance highlighted by these topologies is presented in comparison to the performance of Single Input Single Output (SISO) technique. Moreover, in addition to the Bit Error Rate (BER) classically used to evaluate system performance, the Modulation Error Ratio (MER) is also used. The results have shown that colocated MISO technique outperforms SISO technique by 2:18 dB while distributed MISO technique outperforms SISO technique by 5:37 dB at a BER of 105 in presence of Rayleigh P1 channel. In the case of SFN, co-located MISO technique outperforms SISO technique by 2:58 dB while MISO distributed mode outperforms SISO technique by 15:24 dB at a BER of 105. Furthermore, the MER values confirm the performance improvement of DVB-T2 system when distributed MISO is exploited. Those results are obtained by using CSP-DVB-T2 simulator that was modified in order to evaluate MISO impact in DVB-T2 system.Appui à la mise en place d'un Master professionnalisant en photonique et en radiodiffusion numérique - PHORAN - Fédération Wallonie Bruxelle

Performance comparison of new waveforms applied to DVB-T2 transmissions

In this paper, Universal Filtered Multicarrier (UFMC) and Filter Bank Multicarrier (FBMC), the promising filter based waveforms are proposed in Digital Video BroadcastingTerrestrial, second generation (DVB-T2) as an alternative to Orthogonal Frequency Division Multiplexing (OFDM). While no filtering operation is carried out in OFDM, the filtering in UFMC is done on groups of subcarriers and in FBMC on each subcarrier. Due to their filtering characteristics, different types of tools such as Power Spectral Density (PSD), spectral efficiency and Bit Error Rate (BER) are used to compare them. These waveforms are simulated in urban environment using a Power Delay Profile (PDP) of the Typical Urban 6 (TU6) channel. The Zero Forcing (ZF) equalization technique is used for OFDM and UFMC simulations while, in the case of FBMC, an equalizer based on frequency sampling is employed: the Complex Finite Impulse Response (CFIR) with 3 taps. In term of spectral efficiency, UFMC and FBMC are respectively 128% and 133% spectrally more efficient than OFDM. Simulation results show that the PSD of FBMC presents better Out Of Band (OOB) than that of UFMC which in turn presents better OOB than that for OFDM. Furthermore, for 32K mode, FBMC and UFMC present respectively a performance gain of 1 dB and 1.2 dB at a BER of 10^-3 when compared to OFDM. This paper gives rules about the compromise to establish between spectral efficiency, performance gain and complexity of both UFMC and FBMC waveforms. The choice of FBMC as an alternative to OFDM in DVB-T2 system induces a high spectral efficiency and a better performance gain with a cost of increased complexity whereas the choice of UFMC induces a medium spectral efficiency and a noticeable performance gain with a complexity comparable to that for OFDM. This paper proves that UFMC waveform is the good compromise.Appui à la mise en place d'un Master professionnalisant en photonique et en radiodiffusion numérique - PHORAN - Fédération Wallonie Bruxelle

SCD-MVA: A Mobile Application for Conducting Single-case Experimental Design Research During the Pandemic

The COVID-19 outbreak emphasizes the need for alternative methods for data gathering and collaboration among researchers in a virtual research environment. One experimental design that is well suited in a social distancing research context is the single-case experimental design (SCD). SCDs can handle disruptions as (a) they do not require large groups gathering for data collection or intervention administration, (b) interventions are administered individually and in some cases remotely, (c) no comparison group is needed, and (d) they are adaptive and flexible designs. The purpose of this article is to introduce the mobile application, SCD-MVA (2019), developed to assists in the design of an SCD, data gathering, data analysis, and remote collaboration. The application allows data management and data sharing among researchers, provides an in real time visualization of the gathered data, stimulates interaction between researchers in terms of designing the SCD, gathering the data, and analyzing the gathered data, and does all these things with no need for in-person meetings of the research team

Experimental and modeling study of fission products and minor actinides extraction with N,N-dialkylamides

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