scholarly journals Impact of GPS Interference on Time Synchronization of DVB-T Transmitters

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Juraj Machaj ◽  
Peter Brida ◽  
Norbert Majer ◽  
Roman Sčehovič
Keyword(s):  
Time Synchronization ◽  
Location Based Services ◽  
Single Frequency ◽  
Wireless Transmitters ◽  
Digital Video Broadcasting ◽  
Signal Distribution ◽  
Single Frequency Network ◽  
Video Broadcasting ◽  
Network Operation ◽  
The Impact

Nowadays, the Global Positioning System (GPS) is widely used in all aspects of our lives. GPS signals are not used only in positioning and navigation applications and services in transport and military, but, thanks to quite precise information about time, also for synchronization of world trade and synchronization of wireless transmitters. However, with the recent spread of location-based services, a large number of GPS jammers had appeared. Use of these jammers is prohibited by law; however, their use is gaining popularity especially in the transport segment since jammers can be used to trick vehicle onboard units and help avoid paying toll fees on highways or avoid tracking of company cars when used privately. In this paper, we will investigate the impact of GPS interference caused by jamming and spoofing on the synchronization of Single Frequency Network (SFN) Digital Video Broadcasting–Terrestrial (DVB-T) transmitters. Since GPS signals are used in the DVB-T SFN to provide synchronization which is crucial for the correct network operation, the interference of GPS signals can cause problems with signal distribution. Thus, signals received from a DVB-T SFN network might be out of synchronization and disrupt the service for users.

scholarly journals A Novel Selected Subcarrier Method for Digital Video Broadcasting

2019 ◽  
Vol 9 (1) ◽  
pp. 4916-4921
Keyword(s):  
Digital Video ◽  
Single Frequency ◽  
Digital Video Broadcasting ◽  
Single Frequency Network ◽  
Video Broadcasting ◽  
Local Content ◽  
Novel Technique ◽  
Types Of Information ◽  
Global And Local

In Digital Video broadcasting there are two types of information namely global and local content. Broadcasting both information using multifrequency network requires large spectrum. To overcome that single frequency network is incorporated.Inorder to transmit both the information in a single frequency network, a novel technique, namely selected subcarrier method of Digital Video Broadcasting is proposed. This technique is well suited in a scenario where the transmission of two different information is targeted over the entire globe at the same time. This methodology proficiently handles the concept of Orthogonality principles among the OFDM subcarrier. In this technique certain dedicated subcarrier is used for transmission of Local content in the network.Also, wavelet-based OFDM has been proposed, which outperforms the existing Fourier based OFDM

scholarly journals Method of Calculating Desynchronization of DVB-T Transmitters Working in SFN for PCL Applications

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5776
Author(s):  
Karol Klincewicz ◽  
Piotr Samczyński
Keyword(s):  
Digital Video ◽  
Time Difference ◽  
Target Localization ◽  
Single Frequency ◽  
Passive Radar ◽  
Time Difference Of Arrival ◽  
Digital Video Broadcasting ◽  
Video Broadcasting ◽  
Novel Method ◽  
Result Analysis

This paper presents a novel method of calculating desynchronization between transmitters working in a single frequency digital video broadcasting-terrestrial (DVB-T) network. The described method can be a useful tool for enhancing passive radar operations and improving passive coherent location (PCL) sensors to correct their measurements of target localization. The paper presents the problem of localizing DVB-T transmitters utilized by passive radars, and proposes a novel method based on Time Difference of Arrival (TDoA) techniques to solve the problem. The proposed technique has been validated using real signals collected by a PCL sensor receiver. The details of the experiment and extensive result analysis are also contained in this article.

Single Frequency Networks for Digital Video Broadcasting

1999 ◽  
pp. 120-142 ◽  
Author(s):  
Jesús M. Fernández ◽  
J. Capdevila ◽  
R. García ◽  
S. Cabanillas ◽  
S. Mata ◽  
...  
Keyword(s):  
Digital Video ◽  
Single Frequency ◽  
Digital Video Broadcasting ◽  
Video Broadcasting

Quantization Algorithms in Healthcare Information Telematics Using Wireless Interactive Services of Digital Video Broadcasting.

2020 ◽  
Vol 13 ◽  
Author(s):  
Konstantinos Kardaras ◽  
George I. Lambrou ◽  
Dimitrios Koutsouris
Keyword(s):  
Data Compression ◽  
Data Transmission ◽  
Digital Video ◽  
Digital Television ◽  
End User ◽  
Digital Video Broadcasting ◽  
New Era ◽  
Video Broadcasting ◽  
Television Network ◽  
Interactive Services

Background: In the new era of wireless communications new challenges emerge including the provision of various services over the digital television network. In particular, such services become more important when referring to the tele-medical applications through terrestrial Digital Video Broadcasting (DVB). Objective: One of the most significant aspects of video broadcasting is the quality and information content of data. Towards that end several algorithms have been proposed for image processing in order to achieve the most convenient data compression. Methods: Given that medical video and data are highly demanding in terms of resources it is imperative to find methods and algorithms that will facilitate medical data transmission with ordinary infrastructure such as DVB. Results: In the present work we have utilized a quantization algorithm for data compression and we have attempted to transform video signal in such a way that would transmit information and data with a minimum loss in quality and succeed a near maximum End-user approval. Conclusions: Such approaches are proven to be of great significance in emergency handling situations, which also include health care and emergency care applications.

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