Transcript Regional Workshop on planning of digital terrestrial broadcasting in relation to RRC-06 for CEE, CIS and Baltic States (Moscow, 21 –24 September.

Regional Workshop on planning of digital terrestrial
broadcasting in relation to RRC-06 for CEE, CIS and
Baltic States (Moscow, 21 –24 September 2004)
Technical parameters and
propagation model for
planning
Pham Nhu Hai
Radiocommunication Bureau
Technical parameters and propagation model
Outline
Strategic considerations
Planning considerations
Planning criteria
Propagation model
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Important strategic decisions
What sort of communication models?
Political
Economic
Technical- convergence
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Planning considerations
Producing a digital plan
Complex, multi-dimensional project
Many technical inputs
• Minimum signal levels
• Protection ratios
• Type of reception, etc….
No single and universal solution
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
In developing the digital plan
Use representative criteria and
parameters
Ensure flexibility for future demands
Conversion between reception modes
• Fixed to portable and mobile reception
Network configuration
• Evolution from MFN to SFN
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Planning considerations
Frequency bands
Reception modes
System variants
Network structure
Coverage quality
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Frequency bands?
174-230 MHz
DVB-T and T-DAB
No rigid splitting except on national basis
Mixed TV channel spacing
Non-aligned TV channels
470-862 MHz
DVB-T at 8 MHZ channel spacing
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Which reception mode?
DVB-T
Fixed
Portable outdoor and indoor
Mobile
T-DAB
Mobile
Portable indoor
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
DVB-T system variants?
2k or 8k OFDM
System variants
Hierarchical or non-hierarchical Modulation
QPSK, 16QAM or 64 QAM
Code rate
Bit rate
120 DVB-T system variants
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Network structure?
MFN
SFN
Dense SFN
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Coverage quality?
In terms of percentage of location
70%
95%
99%
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Planning criteria
Minimum median field strength
50% of locations, 50% of time and 10 m
a.g.l
Calculated from
• C/N
• Receiving conditions
• Location correction factors
Protection ratios
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
C/N and Data rate vs code rate
(source EBU)
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
C/N and Data rate vs guard interval
(source EBU)
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Fixed reception
Radiation pattern of receiving antenna
ITU-R BT.419
Receiving antenna gain
7/10/12 dB for 200/500/800 MHz
Feeder loss
2/3/5 dB for 200/500/800 MHz
Location probability – 95%
Polarization discrimination - Yes
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Portable reception
Antenna pattern: omnidirectional
Antenna gain: -2.2/0 dB for VHF/UHF
Feeder loss: 0 dB
Height loss at 1.5 m
12/16/18 dB for 200/500/800 MHz
Building penetration loss
9/8 dB for VHF/UHF
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Portable reception (2)
Location probability
DVB-T: 70% to 95%
T-DAB: 95% (indoor)
Polarization discrimination
Not taken into account
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Mobile reception
Antenna pattern: omnidirectional
Antenna gain: -2.2/0 dB for VHF/UHF
Feeder loss: 0dB
Height loss at 1.5 m
12/16/18 dB for 200/500/800 MHz
Location probability: 99%
Polarization discrimination: No
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Calculate minimum median field strength
Minimum C/N
Receiver noise input power (receiver noise figure and
noise bandwidth)
Effective antenna aperture (antenna gain)
Feeder loss
Minimum field strength
Man-made noise
Height loss
Building penetration loss
Location correction factor
Minimum median field strength
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Minimum median field strength – DVB-T
How to calculate?
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Emed for DVB-T Reference Planning configurations
RPC
RPC1
RPC2
RPC3
95%
95%
95%
Reference C/N
21
19
17
Reference Emed
(200 MHz)
50
67
76
Reference Emed
(650 MHz)
56
78
88
Location
probability
RPC1: RPC for fixed roof reception
RPC2: RPC for portable outdoor or low coverage quality portable indoor or mobile reception
RPC3: RPC for higher coverage quality for portable indoor recption
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Emed for T-DAB Reference planning configurations
RPC
RPC4
RPC5
99%
95%
Reference C/N
15
15
Reference Emed
dBuV/m (200 MHz)
60
66
Location probability
RPC4: RPC for mobile reception
RPC5: RPC for portable indoor reception
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Protection ratios
Unwanted
Wanted
ITU-R BT. 1368
DVB-T
DVB-T
ITU-R BS. 1660
15 dB
T-DAB
T-DAB
ITU-R BS. 1660
ITU-R BT. 1368
Analogue TV
Analogue TV
ITU-R T. 655
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
Propagation model
ITU-R P.1546-1 modified
9 geographical zones
Measurement results
Theoretical considerations
No terrain height database used
Free space prediction used in for
airborne stations
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004
Technical parameters and propagation model
RRC Workshop for CEE, CIS and Baltic States, Moscow,
21-24 Sept 2004