wireless was
...but actually it’s more like this.
The mobility use- cases of
DVB-T are centered around
modulation features
Sig nalling
Service available? If yes: frequency and IDs?
If not: ???
Next fequency?Munich
4.6.2 TPS transmission format The transmission parameter information shall be transmitted as shown in table 9.
The mapping of each of the transmission parameters: constellation characteristics, ! value, code rate(s), super-frame indicator and guard interval onto the bit combinations is performed according to clauses 4.6.2.1 to 4.6.2.8. The left most bit is sent first.
Table 9: TPS signalling information and format
Bit number Format Purpose/Content s0 see clause 4.6.2.1 Initialization
s1to s16 0011010111101110 or 1100101000010001
Synchronization word
s17 to s22 see clause 4.6.2.3 Length indicator (see annex F) s23, s24 see table 10 Frame number s25, s26 see table 11 Constellation
s27, s28, s29 see table 12 Hierarchy information (see annex F) s30, s31, s32 see table 13 Code rate, HP stream s33, s34, s35 see table 13 Code rate, LP stream
s36, s37 see table 14 Guard interval s38, s39 see table 15 Transmission mode (see annex F)
s40 to s47 see clause 4.6.2.10 Cell identifier s48 to s53 all set to "0" See annex F s54 to s67 BCH code Error protection
The TPS information transmitted in super-frame m' bits s25 - s39 always apply to super-frame m' + 1, whereas all other bits refer to super-frame m'.
4.6.2.1 Initialization The first bit, s0, is an initialization bit for the differential 2-PSK modulation. The modulation of the TPS initialization bit is derived from the PRBS sequence defined in clause 4.5.2. This process is described in clause 4.6.3.
4.6.2.2 Synchronization Bits 1 to 16 of the TPS is a synchronization word.
The first and third TPS block in each super-frame have the following synchronization word:
s1 - s16 = 0011010111101110.
The second and fourth TPS block have the following synchronization word:
s1 - s16 = 1100101000010001.
4.6.2.3 TPS length indicator The first 6 bits of the TPS information is used as a TPS length indicator (binary count starting from and including bit s17) to signal the number of used bits of the TPS.
cell_id = 0x1015
cell_id = 0x2117
NITactual / other
cell_list_descriptor
cell_idn
lattituden
longituden
lat_extentn
long_extentn
Solution Part 2:
associated service
National Services
National Services
Regional Services
associated service
netw_id, ts_id, orig_nw_id, svc_id
netw_id, ts_id, orig_nw_id, svc_id
ts_id, orig_nw_id, svc_id
Frequencies, topology and identifiers help us avoid those reception pot holes...
cool They help us put the
back into Broadcast
Thank You Very Much For Your Attention!
alexander.adolf@me.com www.condition-alpha.com
• All other Photos: from The Commons collection on flickr
All product names and logos may be registered trade marks and are properties of their respective owners.
Credits
• Mobile Reception of DVB-T http://www.dvb.org/documents/white-papers/dvbtpaper.pdf
• Terrestrial DVB (DVB-T): A Broadcast Technology for Stationary Portable and Mobile Use http://www.tijbc.com/pruebas-7419/I0782913.pdf
• Mobile DVB-T Using Antenna Diversity Receivers http://www.teamcast.us/data/upload/files/BIBFILE_FILE_J5RoETZ.pdf
Reading List