Search results for "DVB"

Uso de Software-Defined Radio en la enseñanza de sistemas de comunicaciones

2017

[ES] En la docencia de sistemas de comunicación hay una componente teórica elevada. La percepción de los estudiantes al estudiar estas asignaturas es negativa. Este trabajo trata de explicar la motivación y la estrategia seguida para reorientar esta percepción a partir de la introducción de elementos de “Software-Defined Radio” (SDR) y “Universal Software Radio Peripherals” (USRP) en diferentes asignaturas del Grado de Ingenier´ıa Telem´atica de la Universitat de València

Design of an efficient digital down-converter for a SDR-based DVB-S receiver

2007

This paper presents the design of an area-power efficient digital down-converter suitable for broadband communication systems. The DVB-S standard has been used as a design example. It has been shown that by selecting a bandpass sampling to generate only one spectral image, the case in which the relationship between the digital carrier frequency and the sampling frequency is 1/4, not only gives the smallest area but the lowest power consumption.

Filecasting for streaming content delivery in IP datacast over DVB-H systems

2008

In this paper we investigate the potential gain that can be obtained in DVB-H by delivering streaming content as a succession of time-constrained flies using Application Layer - Forward Error Correction (AL-FEC) for improving the reception for mobile terminals. Compared to the conventional approach with link layer MPE-FEC, this technique allows to increase the robustness of the DVB-H transmission not only as a function of the capacity devoted for error repair (FEC overhead), but also as a function of the number of data bursts coded jointly ("file" or, source data block, size). The main drawback of this approach is an increase of the network latency proportional to the source block size, tha…

On the Provisioning of Mobile Digital Terrestrial TV Services to Vehicles With DVB-T

2012

[EN] Most of the DVB-T (Digital Video Broadcasting -Terrestrial) networks deployments worldwide have been designed for fixed rooftop antennas and high transmission capacity, not providing good coverage level for vehicular mobile reception. This letter analyzes how to combine different technical solutions, so far studied individually, in order to increase the robustness of the transmission for vehicular reception to provide in-band mobile services. In particular, we consider: receive antenna diversity, hierarchical modulation, and Application Layer Forward Error Correction (AL-FEC). Performance evaluation results have been obtained by means of simulations, laboratory tests, and field measure…

Repair Mechanisms for Broadcast Transmissions in Hybrid Cellular & DVB-H Systems

2006

This paper proposes a framework for investigating potential infrastructure cost savings in hybrid cellular and DVB- H systems by performing efficient error repair of broadcast transmissions. The main idea is to reuse as much as possible the existing network infrastructure to provide mobile TV services. The cellular system is not only employed to collect information, but also to send repair data to the users whose conditions are temporarily affected by noise, interference and fading. To enable an easy and efficient implementation of the repair mechanisms we adopt the use of application layer - forward error correction (AL-FEC) with digital fountain coding.

Application Layer FEC for Mobile TV Delivery in IP Datacast Over DVB-H Systems

2009

In this paper we investigate the potential gain that can be obtained in DVB-H using application layer forward error correction (AL-FEC) to perform a multi-burst protection of the transmission for improving the reception of streaming services for mobile terminals. Compared to the conventional approach with link layer multi protocol encapsulation FEC (MPE-FEC), this technique allows to increase the robustness of the DVB-H transmission not only as a function of the capacity devoted for error repair (FEC overhead), but also as a function of the number of bursts jointly encoded. The main drawback of this approach is an increase of the network latency, that can be translated into a larger service…

Haasteiden ja ongelmien merkitys digitaalisen mobiilitelevision omaksumisprosessissa

2008

Satelliittijärjestelmän linkkibudjettianalyysi

2013

Tutkielmassa selvitetään kirjallisuuskatsauksen avulla DVB-S ja DVB-RCS standardien mukaisten interaktiivisten satelliittijärjestelmien linkkibudjettia. Toisen sukupolven standardien eli DVB-S2 ja DVB-RCS2 mukaisten järjestelmien erityispiirteiden huomioiminen linkkibudjetin kannalta on tutkielman keskeinen teema. Tutkielma pyrkii antamaan selkeän kuvan satelliittijärjestelmän linkkibudjetista sekä tuomaan näkökulmia satelliittijärjestelmien jatkotutkimukseen ja suunnittelutyöhön. The link budget analysis of the satellite system. This paper discusses the link budget of the satellite systems based on DVB-S and DVB-RCS standards. Used method is literature review. The key theme is to study spe…