Cost Efficient Provisioning of Mass Mobile Multimedia Services in Hybrid Cellular and Broadcasting Systems

Barquero, David Gómez

doi:10.4995/thesis/10251/6881

Cited by 8 publications

(10 citation statements)

References 92 publications

(143 reference statements)

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“…The results obtained in field tests [44,45] have revealed that the use of TI at the physical layer outperforms MPE-iFEC in every reception scenario. Although long TI achieves the largest gain in LMS channels, it has been shown to achieve significant gains in terrestrial channels as well [10,46,47]. In particular, the utilization of Application Layer -Forward Error Correction (AL-FEC) has been proposed for extending the protection of DVB-H services across multiple time-slicing bursts.…”

Section: Time Diversity In Mobile Broadcasting Systemsmentioning

confidence: 99%

“…As a result, the costs associated to the deployment of mobile broadcasting networks with good coverage are only justificable in urban areas with a high user density, where it is possible to eventually recover the initial investment in infrastructure. In order to avoid this situation, it would be desirable to perform an incremental deployment that follows the user demand [10]. Within this scenario, the cellular network would prevent the over-dimensioning of the broadcasting capacity, and would ensure the service continuity in low populated areas with no initial broadcasting infrastructure.…”

Section: 1 Evolution Of Terrestrial Mobile Broadcasting Systemsmentioning

confidence: 99%

“…The MODCOD is assumed to be QPSK 1/2 in portable indoor, vehicular, and handheld indoor reception, and 256QAM 3/5 in fixed reception 9 Height loss corresponds to the urban scenario. 10 Antenna gain relative to half wave dipole. 11 Location correction factor corresponds to good coverage quality (i.e.…”

Section: Combined Space and Time Diversity In Dvb-t2mentioning

confidence: 99%

“…The total spectral efficiency in one RF channel that combines fixed and mobile services by means of multiple PLPs, S PLP , can be approximated by: 10) where N c is the total number of subcarriers per OFDM symbol, N d is the number of subcarriers with data (non-pilot) information per OFDM symbol, G is the fraction of guard interval, B f is the number of bits per cell in the case of fixed services, B m is the number of bits per cell in the case of mobile services, T f is the portion of time dedicated to the transmission of fixed services, and T m is the portion of time dedicated to the transmission of mobile services. On the contrary, if the T2-Lite profile is used instead, the total spectral efficiency, S Lite , can be computed as: 11) where It is important to note that although we have not included the percentage of time that is needed for the transmission of L1-signalling, this represents less than 1% of the total transmission time, and thus, it has a minimal impact in the calculations.…”

Section: Combined Space and Time Diversity In Dvb-t2mentioning

confidence: 99%

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Combined Time, Frecuency and Space Diversity in Multimedia Mobile Broadcasting Systems

Serrano¹

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The combined use of diversity in the time, frequency, and space domains constitutes a powerful instrument to improve the reception of mobile broadcasting services. The improvement brought by the utilization of diversity techniques can be translated into an extended coverage of mobile services, or into a reduction of the network infrastructure. This dissertation addresses the use of diversity for the provision of mobile services in the European family of terrestrial broadcasting systems standardized by the DVB (Digital Video Broadcasting) consortium. This includes the first and second generation systems DVB-T (Terrestrial), DVB-H (Handheld) and DVB-T2 (Terrestrial 2nd Generation), as well as the next generation system DVB-NGH. Nevertheless, the work carried out in this dissertation is of generic nature and can be applied to future evolutions of standards such as the Japanese ISDB-T or the American ATSC. Our investigations employ an information-theoretic approach to obtain the performance limits of diversity techniques, as well as physical layer simulations to evaluate the performance in real systems.The investigations carried out in the context of DVB-T, DVB-H, and DVB-T2 are aimed at the simultaneous delivery of fixed and mobile services in terrestrial broadcasting networks. The convergence of the fixed and mobile paradigms can facilitate the introduction of mobile TV services by allowing the reuse of spectrum, content and infrastructure. The results show that the incorporation of time interleaving (TI) at the physical layer for time diversity, and single-input multiple-output (SIMO) for space diversity are critical for the performance of mobile broadcasting systems. Upper layer FEC (UL-FEC) techniques can be used to achieve time diversity in first generation systems like DVB-T and DVB-H; however, they require the transmission of additional parity data and are not useful for stationary reception. The analysis in terms of link budget reveals that the combined use of time and space diversity is not sufficient to enable the provision of mobile services with acceptable coverage levels in DVB-T and DVB-T2 networks planned for fixed reception. In contrast, diversity techniques can be used in networks planned for portable indoor iii ABSTRACT reception to increase the capacity of vehicular services and extend the coverage of handheld indoor reception.The utilization of combined diversity in the time, frequency, and space domains has been investigated in the context of DVB-NGH, the first broadcasting system to exploit the diversity in the three domains by incorporating at the physical layer long TI, time-frequency slicing (TFS) and multiple-input multiple-output (MIMO). In addition, the adoption of rotated constellations provides better robustness against fading by means of signal-space diversity (SSD).DVB-NGH features an optional satellite component, and has adopted long TI in order to cope with the signal outages that are characteristic of land mobile satellite (LMS) channels. However, the solution adopted in t...

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Section: Time Diversity In Mobile Broadcasting Systemsmentioning

confidence: 99%

Section: 1 Evolution Of Terrestrial Mobile Broadcasting Systemsmentioning

confidence: 99%

Section: Combined Space and Time Diversity In Dvb-t2mentioning

confidence: 99%

Section: Combined Space and Time Diversity In Dvb-t2mentioning

confidence: 99%

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Combined Time, Frecuency and Space Diversity in Multimedia Mobile Broadcasting Systems

Serrano¹

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“…It also supports the concept of Rotated Constellations (RC) and includes an additional 256QAM constellation. Standardization activities were also addressed on the development of mobile broadcasting systems, despite the lack of market and financing needed [13]. The handheld evolution of DVB-T2, Digital Video Broadcasting -Next Generation Handheld (DVB-NGH), is the state-of-the-art standard for DTT mobile communications, and includes some of the most advanced transmission techniques to cope with adversities and characteristics of mobile channels [14].…”

Section: Next-generation Digital Terrestrial Broadcastingmentioning

confidence: 99%

Non-Uniform Constellations for Next-Generation Digital Terrestrial Broadcast Systems

Muela¹

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Nowadays, the digital terrestrial television (DTT) market is characterized by the high capacity needed for high definition TV services, and the limited spectrum available. There is a need for an efficient use of the broadcast spectrum, which requires new technologies to guarantee increased capacities. NonUniform Constellations (NUC) arise as one of the most innovative techniques to approach those requirements. These constellations have been implemented in next-generation broadcast systems such as DVB-NGH (Digital Video Broadcasting -Next Generation Handheld) or ATSC 3.0 (Advanced Television Systems Committee -Third Generation). NUCs reduce the gap between uniform Gray-labelled Quadrature Amplitude Modulation (QAM) constellations and the theoretical unconstrained Shannon limit. With these constellations, symbols are optimized in both in-phase (I) and quadrature (Q) components by means of signal geometrical shaping, considering a certain signal-to-noise ratio (SNR) and channel model.There are two types of NUC, depending on the number of real-valued dimensions considered in the optimization process, i.e. one-dimensional and two dimensional NUCs (1D-NUC and 2D-NUC, respectively). 1D-NUCs maintain the squared shape from QAM, but relaxing the distribution between constellation symbols in a single component, with non-uniform distance between them. These constellations provide better SNR performance than QAM, without any demapping complexity increase. 2D-NUCs also relax the square shape constraint, allowing to optimize the symbol positions in both dimensions, thus achieving higher capacity gains and lower SNR requirements. However, the use of 2D-NUCs implies a higher demapping complexity, since a 2D-demapper is needed, i.e. I and Q components cannot be separated.In this dissertation, NUCs are analyzed from both transmit and receive point of views, using either single-input single-output (SISO) or multiple-input multiple-output (MIMO) antenna configurations. In SISO transmissions, 1D-NUCs and 2D-NUCs are optimized for a wide range of SNRs, several channel models and different constellation orders, using the Nelder-Mead optimization 3 ABSTRACT algorithm. The optimization of rotated 2D-NUCs is also investigated, including the rotation angle as an additional variable in the optimization. Even though the demapping complexity is not increased, the SNR gain of these constellations is not significant. The highest rotation gain is obtained for low-order constellations and high SNRs. However, with multi-RF techniques such as Channel Bonding (CB) or Time-Frequency Slicing (TFS), the SNR gain is drastically increased, since I and Q components are transmitted in different RF channels. In this thesis, multi-RF gains of NUCs with and without rotation are provided for some representative scenarios.At the receiver, two different implementation bottlenecks are explored. First, the demapping complexity of all considered constellations is analyzed. Afterwards, two complexity reduction algorithms for 2D-NUCs are proposed. Both algor...

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Planning a mobile DVB-T network for Colombia

Lopez

Gómez-Barquero

Garcı́a

et al. 2009

2009 IEEE Latin-American Conference on Communications

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Cost Efficient Provisioning of Mass Mobile Multimedia Services in Hybrid Cellular and Broadcasting Systems

Cited by 8 publications

References 92 publications

Combined Time, Frecuency and Space Diversity in Multimedia Mobile Broadcasting Systems

Combined Time, Frecuency and Space Diversity in Multimedia Mobile Broadcasting Systems

Non-Uniform Constellations for Next-Generation Digital Terrestrial Broadcast Systems

Planning a mobile DVB-T network for Colombia

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