Design of Antennas for Handheld DVB-H ... - Lunds tekniska högskola
Design of Antennas for Handheld DVB-H ... - Lunds tekniska högskola
Design of Antennas for Handheld DVB-H ... - Lunds tekniska högskola
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
2.1.5 <strong>DVB</strong>-H<br />
<strong>DVB</strong>-H is the latest developed standard within the <strong>DVB</strong> transmission standards.<br />
The work with the technical specification started in autumn 2002 and was finished<br />
in February 2004. In November the same year ETSI finally published the <strong>DVB</strong>-H<br />
standard as a European Norm [12].<br />
The first step towards <strong>DVB</strong>-H was taken when the ability <strong>of</strong> <strong>DVB</strong>-T to deliver<br />
broadcast services to mobile receivers was demonstrated.<br />
The problem was the power consumption, and that lead to the new standard,<br />
<strong>DVB</strong>-H that enables IP datacasting. IP datagrams that are broadcasted over <strong>DVB</strong>-<br />
H are encapsulated inside the MPEG-2 transport stream using the Multi Protocol<br />
Encapsulation (MPE) to improve mobile per<strong>for</strong>mance [11].<br />
<strong>DVB</strong>-H is so similar to <strong>DVB</strong>-T that it is possible to send <strong>DVB</strong>-H signals along<br />
with <strong>DVB</strong>-T signals in the multiplexer, between 470 – 862 MHz [4]. That it is<br />
possible to reuse <strong>DVB</strong>-T transmission equipment makes it an interesting<br />
technique in an economically point <strong>of</strong> view. <strong>DVB</strong>-H has a downstream channel<br />
with capacity <strong>of</strong>f several Mbit/s. It may be used <strong>for</strong> radio and video streaming, file<br />
downloads and many other applications.<br />
<strong>DVB</strong>-H includes the following additions to improve the features <strong>for</strong> a mobile<br />
terminal:<br />
• Time slicing, in order to reduce the average power consumption <strong>of</strong> the<br />
terminal and to make it possible to smooth handovers.<br />
• MPE-FEC, <strong>for</strong> improving Doppler per<strong>for</strong>mance and tolerance to impulse<br />
interference.<br />
• 4k-mode, provides more flexibility to network design.<br />
• In-depth symbol interleaver, <strong>for</strong> further improvement <strong>of</strong> the transmitted<br />
signal robustness in mobile environment.<br />
• Extended Transmission Parameter Signaling (TPS).<br />
The <strong>DVB</strong>-H standard recommends using H.264 (MPEG-4 Part 10: Advanced<br />
Video Codec) and the CIF resolution (352*288) in difference to <strong>DVB</strong>-T that uses<br />
MPEG-2 code and SDTV (720*576) [14]. During 2004 and 2005 successful trials<br />
have been going on in Helsinki, Berlin and Pittsburg.<br />
Several European countries have plans to launch commercial services already<br />
2006, and according to market prospects, the sales figures will be somewhere<br />
between 10 and 100 millions 2008 [15]<br />
9
Change language