Electronic And Postal Communications (Digital and other Broadcasting
Networks)
G.N. No. 418 (contd)
–
for fixed reception, Corr = 20 log10 (f/fr), where f is the actual frequency and fr the
reference frequency of the relevant band quoted in Table 1;
–
for portable reception and mobile reception, Corr = 30 log10 (f/fr) where f is the
actual frequency and fr the reference frequency of the relevant band quoted in Table
1.
The standard deviation used for the calculation of the location correction factor of each RPC shall
be as follows:
–
for RPC 1 and RPC 2: 5.5 dB in VHF and UHF,
–
for RPC 3: 6.3 dB in VHF and 7.8 dB in UHF.
(c) A Multiplex Operator shall use four Reference Networks (RNs) in order to cover the different
implementation requirements for DVB-T networks as follows: large service-area SFN, small
service area SFN & dense SFN, small service area SFN for urban environment and semi-closed
small service area SFN.
(a)
(b)
(c)
(d)
(e)
I: Large service-area SFN (Table 2)
This network consists of seven transmitters situated at the centre and at the vertices
of a hexagonal lattice.
The transmitters have non-directional antenna patterns;
The service area is assumed to exceed the transmitter hexagon by about 15%.
This network applies to: fixed, outdoor/mobile, and indoor reception, for both
Band III and Bands IV/V.
For portable and mobile reception, the size of the real service areas for this type of
SFN coverage is restricted to 150 to 200 km in diameter
Table 2: Parameters of Large Service Area SFN
RPC and reception type
RPC 1
Fixed antenna
RPC 2
Portable outdoor and
mobile
RPC 3
Portable indoor
Open
Open
Open
Hexagon
Hexagon
Hexagon
7
7
7
Geometry of transmitter lattice
Hexagon
Hexagon
Hexagon
Distance between transmitters
d (km)
70
50
40
Service area diameter D (km)
161
115
92
Tx effective antenna height (m)
150
150
150
Non-directional
Non-directional
Non-directional
Band III
34.1
36.2
40.0
Bands IV/V
42.8
49.7
52.4
Type of network
Geometry of service area
Number of transmitters
Tx antenna pattern
e.r.p.* (dBW)
51