DRM - TAPR
TECHNOLOGIES RADIO & SIGNAL UNIT
New International Digital audio-broadcasting standard, voice coding and amateur radio applications Cédric DEMEURE Hamvention, Dayton, Ohio, USA May 19 2002
THALES COMMUNICATIONS
1
TECHNOLOGIES RADIO & SIGNAL UNIT
2
Summary
z Digital Radio Mondiale z HF High data rate Modem z Speech coders z Digital Amateur Radio 3 kHz demonstrator
THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
3
DRM z World-wide consortium to promote a unique standard for
digital LF, MF & HF audio-broadcasting z Members include : Î Broadcasters and Broadcasting associations Î Network Operators Î Research Institutes Î Component, Receiver and Transmitter Manufacturers Î Regulatory and Standardisation Authorities z Key features: Î Worldwide standard
Î Better audio quality
Î Simple to use receivers
Î Low cost equipment
Î Text message
Î Data applications
Î Provide future enhancements
THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
4
DRM
73 DRM-Members from 27 countries, Feb 2002 THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
DRM Members z See www.drm.org for more details z USA Î Harris Broadcast Î International Broadcasting Bureau Î Continental Electronics Corporation Î Sangean America Inc. Î Technology for Communications International z Others : Î BBC, Sony, Bosch, Thales, NHK, RFI, DW, JVC, Telefunken ...
THALES COMMUNICATIONS
5
TECHNOLOGIES RADIO & SIGNAL UNIT
6
DRM STANDARDISATION PROCESS ISO MPEG
DRM
IEC ITU Sector member
National delegation
JRG ITU/IEC
ETSI ARIB Other regional standardisation bodies
THALES COMMUNICATIONS
ITU
TECHNOLOGIES RADIO & SIGNAL UNIT
7
DRM: Different transmission modes (1) System flexibility in Digital Frequency
4.5 kHz Carrier Group containing FAC cells 4.5 kHz
5 kHz
4.5 kHz additional Group of Carriers 9 kHz
10 kHz
5 kHz Carrier Group containing FAC cells 18 kHz
20 kHz
5 kHz additional Group of Carriers
Spectrum occupancy for 4.5 kHz channeling for 5 kHz channeling FAC: Fast Access Channel THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
8
DRM: Different transmission modes (2) System flexibility in Simulcast
All bands
AM DSB signal AM VSB signal Group of carriers containing FAC cells Group of carriers
Additional possibilities in HF bands only THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
9
DRM Modem z A highly efficient and flexible OFDM modem: Î very high spectrum efficiency: up to 3 bit/Hz/s Î multi-modes related to propagation and channel bandwidth Î OFDM preferred over single carrier because of flexibility z Various transmission modes adapted to different
Propagation types Î Mode A: Gaussian channels, with minor fading LW and MW
during daytime Î Mode B: Time and frequency selective channels, with longer delay spread: SW and MW nighttime Î Mode C: Time and frequency selective channels, with greater doppler spread: bad SW channels Î Mode D : Very robust mode THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
10
DRM Modem (3) 130 120
1.5 kHz
110 100
33 1/3 Hz
90 80
Frequency Reference
70
Time Reference
60
Gain Reference
50
75
50
3 kHz
40
Remote Control
30
Useful Symbol
20
15
10 DC component
0
(old version)
-10
1.5 kHz
-20 -30 -40
Symbol: 30 ms Useful Symbol + 6 ms Guard Interval Frame: 8 OFDM Symbols, 288 ms
THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
11
System architecture: TX side
Mode 8 kbit/s
Data Stream FAC (Fast Access Channel) SDC (Service Description Channel)
Channel Encoder
Energy Dispersal
MSC
High Protection
Pilot Generator
Normal Protection
Pre-coder
High Protection
FAC Pre-coder
Energy Dispersal
Channel Encoder
SDC Pre-coder
THALES COMMUNICATIONS
Energy Dispersal
DRM Transmission Signal
Cell Interleaver
Channel Encoder
OFDM Signal Generator
Modulator
Ultra Robust Mode 10 kbit/s
Narrow Band CELP Low bitrate Narrow Band CELP
Energy Dispersal
Audio Super Framing
OFDM Cell Mapper
Audio Signal
AAC Mono
Standard Mode 20 kbit/s
Spectral Band Replication SBR
Normal Protection
Multiplex
AAC Stereo
Higher bit-rate max: 48 kbit/s
TECHNOLOGIES RADIO & SIGNAL UNIT
DRM Experimental System Hardware General functional block Diagram
THALES COMMUNICATIONS
12
TECHNOLOGIES RADIO & SIGNAL UNIT
13
DRM Experimental system
MMI transmit
Modem Analysis tool THALES COMMUNICATIONS
MMI receive
Propagation Analysis tool
TECHNOLOGIES RADIO & SIGNAL UNIT
14
System Validation : tests
MW Validation: - 1 transmmission site - 5 receiving sites
SW Validation: - 5 transmmission sites and 17 receiving sites - All SW frequency bands: 5MHz to 25 MHz
Large investigation : most critical paths validated THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
15
Compatibility with existing AM Services Non-modified 250 kW PSM SW TX Output Spectrum
Spectrum at distant receiving site
with Analogue AM DSB signal
at 80 kW rms digital output power with Digital DRM signal THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
DRM Status: receiver chipset & Standard z Various projects to develop chip-sets z Eureka (European Commission sponsored program) DIAM: Î Atmel, Bosch, Sony, TDF, Thales ... Î 2 chips (1 analog RF, 1 digital), direct conversion receiver Î Forecast Availability: end 2003 z DRM the only worldwide ITU standard at SW z DRM and IBOC ITU standard at LW and MW z IBOC standard at FM z Work proposed to extend DRM to FM bands THALES COMMUNICATIONS
16
TECHNOLOGIES RADIO & SIGNAL UNIT
17
Voice coders: Standards and Performances Research coders Existing products
Indicative Quality (MOS) 5
HSX (96)
STG 4591 MELP (02)
WBLBR
2
G 728 (92)
G 723-1 CELP (96)
4 3
G 729 (96)
VLBR ST 4198 (87) ST 4479 (93)
FS 1016 (90)
GSM (87)
G726 (88)
G711 (72)
ST4209 (83)
LPC 10 (83)
1
1k
2k
Parametric coders THALES COMMUNICATIONS
4k
8k Hybrid coders
16k
32k
64k
Waveform coders
Bit rate (bits/s)
TECHNOLOGIES RADIO & SIGNAL UNIT
18
Voice coders: quality Indicative Quality (MOS) 5
G.711 (64 kb/s)
G.721 (32 kb/s)
4
G.728 G.729 (16 kb/s) (8 kb/s)
G.xxx (4 kb/s)
Minimum qual. for high cost application
Consumer quality
3 2
STG 4198 LPC (2,4 kb/s)
STG4591 HSX (2,4 kb/s) (2,4 kb/s 1.2 kb/s)
Minimum qual. For low cost application
1 1970
1980
THALES COMMUNICATIONS
1990
2000
2010
TECHNOLOGIES RADIO & SIGNAL UNIT
Other low rate voice coders z ITU 4 kbits/s : no selection yet between the various
proponents z DVSI : proprietary format (IMBE and AMBE: 2 to 9.6
kbits/s) mainly chosen for satellite communications systems (Inmarsat), Iridium and APCO 25 z Texas MELP : basis for the STG 4591 Stanag z Except for ITU 4kbits/s, all have rather high processing
delay implying long PTT return time
THALES COMMUNICATIONS
19
TECHNOLOGIES RADIO & SIGNAL UNIT
Amateur Radio Demonstrator z Adaptation of the DRM reference receiver for 3 kHz channels z Push-to-talk z Various modes according to : Î Voice coder rate : 1200, 2400, 3200 bits/s (4000-4800 pending) Î Modem robustness Î Choice will be made during lab and fields experiments z 100% PC based for simple integration z Full demonstrator working with Ten-Tec and Kenwood off-
the-self transceivers z Across the Atlantic tests planned for 2002 with ARRL THALES COMMUNICATIONS
20
TECHNOLOGIES RADIO & SIGNAL UNIT
MMI in transmit mode
THALES COMMUNICATIONS
21
TECHNOLOGIES RADIO & SIGNAL UNIT
MMI in receive mode
THALES COMMUNICATIONS
22
TECHNOLOGIES RADIO & SIGNAL UNIT
CONCLUSIONS z DRM World-wide standard is a good technology basis
for Ham z Narrow band, PTT mode easily derived for HF Ham use z Available low bit rate vocoder quality reached acceptable
quality z ARRL plans lab tests then trans-atlantic tests in 2002
THALES COMMUNICATIONS
23
TECHNOLOGIES RADIO & SIGNAL UNIT
Thank you for your attention
Questions ??
THALES COMMUNICATIONS
24
TECHNOLOGIES RADIO & SIGNAL UNIT
THALES COMMUNICATIONS
25
TECHNOLOGIES RADIO & SIGNAL UNIT Australia: China: Canada: Czech R. Croatia Egypt: Ecuador: France: Finland: Germany: Hungary: India: Italy: Japan: Luxembourg Malaysia: Netherlands: Nigeria: Norway: New Zealand: Russia: Spain: Sweden: Switzerland: Tunesia: UK: USA:
FARB Academy of Broadcasting Science Radio Canada International, Nautel Ltd HFCC RIZ Egyptian Radio and Television Union ESPOL, HCJB Atmel, CCETT, Europe 1, Radio France, Radio France Int., TDF, Thales Kymenlaakso Polytechnic APR, Digitalrundfunk Sachsen Anhalt, DLM, DTAG, DW, DLR, FHG, IRT, Micronas, Robert Bosch, Sony Intern., SWR, Telefunken Sendertechnik,, U. of Hanover, U. of Merseburg, U. of Ulm, VPRT Communication Authority, Antenna Hungaria All India Radio RAI Hitachi Kokusai, JVC, NHK Broadcasting Centre Europe (RTL-CTL) ABU Nozema, Radio Nederland Wereldomroep Voice Of Nigeria Telenor Radio NZ Int. Main Centre for Control of Broadcasting Networks and the Voice of Russia Retevision, Universidad del Pais Vasco Coding Technologies, Radio Sweden Int., TERACOM SE, Factum Electronics AB EBU, ITU, ICRC Arab State Broadcasting Union BBC, Christian Vision, LSI Logic, Merlin Com. Int., Qinetiq Ltd, Roke Manor Research Ltd., RadioScape Continental Electronics Corp., Harris Corp., Sangean America, TCI, IBB/VOA, NASB
THALES COMMUNICATIONS
26
TECHNOLOGIES RADIO & SIGNAL UNIT
27
DIAM Chipset RF Analogue Front-End
RF Digital Front-End FM input
Switch Matrix DDC2
AM input DDC1
ANALOG CHIP
APB bus
Audio output Host processor
Audio interface
Initial Synchro
Symbols Demodulation
MLC decoder: Viterbi decoding processor (HW)
D-Cache 8 kbytes
USB (or other) interface
Ext. data mem. 4 Mbit SRAM
I-Cache 8 kbytes
MLC decoder: control part (SW) Demux
I-TCM
32 kbytes
D-TCM
64 kbytes
Audio decoders
MMI and data services
DIGITAL CHIP THALES COMMUNICATIONS
Ext. prog. mem. 2 Mbit Flash DMA
APB bridge
AHB
Internal controls and configurations
Ext. data mem. 8 Mbit SRAM
Narrow-band jammer rejection
Ext. prog. mem. 2 Mbit Flash
TECHNOLOGIES RADIO & SIGNAL UNIT
Demonstrator Description Î Can transmit at the same time vocoded voice + data
(text message, text files, image files...) Î available HSX vocoders : 1200 b/s, 2400 b/s, 3200 b/s (easy addition of other vocoders) Î Can receive both DRM and SSB Ê SSB : audio ouput is the SSB audio Ê DRM : audio output is the vocoder output. In this case, also displays frame error rate, frequency offset, estimated SNR, estimated channel impulse response (in 3D representation)
Î 3 degrees of protection : Ê GND (Ground-wave) for short distance communication Ê SKY (Sky Wave) for long distance Ê ROB (Robust) for difficult conditions
Î Choice between short and long interleaving
THALES COMMUNICATIONS
28
TECHNOLOGIES RADIO & SIGNAL UNIT
Demonstrator Main Features z A simple hardware interfacing system with Radio-Amateur
transceivers Î levels adaptations Î Push-To-Talk detection Î an adjustable VOX system Î receiving level monitoring (if available)
z Easy personalisation Î one editable text file defines the preferred starting options Î one additional editable text file (Settings.cmd) allows adjusting other parameters (thresholds, gains, squelch level...)
THALES COMMUNICATIONS
29
TECHNOLOGIES RADIO & SIGNAL UNIT
Other features z Automatic re-programming of the receiver according to the z z z z z z
currently received message Integrated auto-test Sophisticated channel simulator (for checking performances in terms of SNR, frequency offset, channel severity) PTT test Monitoring level test Transmission of a pure tone instead of the DRM signal Local vocoder auto-test
THALES COMMUNICATIONS
30
New International Digital audio-broadcasting standard, voice coding and amateur radio applications Cédric DEMEURE Hamvention, Dayton, Ohio, USA May 19 2002
THALES COMMUNICATIONS
1
TECHNOLOGIES RADIO & SIGNAL UNIT
2
Summary
z Digital Radio Mondiale z HF High data rate Modem z Speech coders z Digital Amateur Radio 3 kHz demonstrator
THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
3
DRM z World-wide consortium to promote a unique standard for
digital LF, MF & HF audio-broadcasting z Members include : Î Broadcasters and Broadcasting associations Î Network Operators Î Research Institutes Î Component, Receiver and Transmitter Manufacturers Î Regulatory and Standardisation Authorities z Key features: Î Worldwide standard
Î Better audio quality
Î Simple to use receivers
Î Low cost equipment
Î Text message
Î Data applications
Î Provide future enhancements
THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
4
DRM
73 DRM-Members from 27 countries, Feb 2002 THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
DRM Members z See www.drm.org for more details z USA Î Harris Broadcast Î International Broadcasting Bureau Î Continental Electronics Corporation Î Sangean America Inc. Î Technology for Communications International z Others : Î BBC, Sony, Bosch, Thales, NHK, RFI, DW, JVC, Telefunken ...
THALES COMMUNICATIONS
5
TECHNOLOGIES RADIO & SIGNAL UNIT
6
DRM STANDARDISATION PROCESS ISO MPEG
DRM
IEC ITU Sector member
National delegation
JRG ITU/IEC
ETSI ARIB Other regional standardisation bodies
THALES COMMUNICATIONS
ITU
TECHNOLOGIES RADIO & SIGNAL UNIT
7
DRM: Different transmission modes (1) System flexibility in Digital Frequency
4.5 kHz Carrier Group containing FAC cells 4.5 kHz
5 kHz
4.5 kHz additional Group of Carriers 9 kHz
10 kHz
5 kHz Carrier Group containing FAC cells 18 kHz
20 kHz
5 kHz additional Group of Carriers
Spectrum occupancy for 4.5 kHz channeling for 5 kHz channeling FAC: Fast Access Channel THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
8
DRM: Different transmission modes (2) System flexibility in Simulcast
All bands
AM DSB signal AM VSB signal Group of carriers containing FAC cells Group of carriers
Additional possibilities in HF bands only THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
9
DRM Modem z A highly efficient and flexible OFDM modem: Î very high spectrum efficiency: up to 3 bit/Hz/s Î multi-modes related to propagation and channel bandwidth Î OFDM preferred over single carrier because of flexibility z Various transmission modes adapted to different
Propagation types Î Mode A: Gaussian channels, with minor fading LW and MW
during daytime Î Mode B: Time and frequency selective channels, with longer delay spread: SW and MW nighttime Î Mode C: Time and frequency selective channels, with greater doppler spread: bad SW channels Î Mode D : Very robust mode THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
10
DRM Modem (3) 130 120
1.5 kHz
110 100
33 1/3 Hz
90 80
Frequency Reference
70
Time Reference
60
Gain Reference
50
75
50
3 kHz
40
Remote Control
30
Useful Symbol
20
15
10 DC component
0
(old version)
-10
1.5 kHz
-20 -30 -40
Symbol: 30 ms Useful Symbol + 6 ms Guard Interval Frame: 8 OFDM Symbols, 288 ms
THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
11
System architecture: TX side
Mode 8 kbit/s
Data Stream FAC (Fast Access Channel) SDC (Service Description Channel)
Channel Encoder
Energy Dispersal
MSC
High Protection
Pilot Generator
Normal Protection
Pre-coder
High Protection
FAC Pre-coder
Energy Dispersal
Channel Encoder
SDC Pre-coder
THALES COMMUNICATIONS
Energy Dispersal
DRM Transmission Signal
Cell Interleaver
Channel Encoder
OFDM Signal Generator
Modulator
Ultra Robust Mode 10 kbit/s
Narrow Band CELP Low bitrate Narrow Band CELP
Energy Dispersal
Audio Super Framing
OFDM Cell Mapper
Audio Signal
AAC Mono
Standard Mode 20 kbit/s
Spectral Band Replication SBR
Normal Protection
Multiplex
AAC Stereo
Higher bit-rate max: 48 kbit/s
TECHNOLOGIES RADIO & SIGNAL UNIT
DRM Experimental System Hardware General functional block Diagram
THALES COMMUNICATIONS
12
TECHNOLOGIES RADIO & SIGNAL UNIT
13
DRM Experimental system
MMI transmit
Modem Analysis tool THALES COMMUNICATIONS
MMI receive
Propagation Analysis tool
TECHNOLOGIES RADIO & SIGNAL UNIT
14
System Validation : tests
MW Validation: - 1 transmmission site - 5 receiving sites
SW Validation: - 5 transmmission sites and 17 receiving sites - All SW frequency bands: 5MHz to 25 MHz
Large investigation : most critical paths validated THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
15
Compatibility with existing AM Services Non-modified 250 kW PSM SW TX Output Spectrum
Spectrum at distant receiving site
with Analogue AM DSB signal
at 80 kW rms digital output power with Digital DRM signal THALES COMMUNICATIONS
TECHNOLOGIES RADIO & SIGNAL UNIT
DRM Status: receiver chipset & Standard z Various projects to develop chip-sets z Eureka (European Commission sponsored program) DIAM: Î Atmel, Bosch, Sony, TDF, Thales ... Î 2 chips (1 analog RF, 1 digital), direct conversion receiver Î Forecast Availability: end 2003 z DRM the only worldwide ITU standard at SW z DRM and IBOC ITU standard at LW and MW z IBOC standard at FM z Work proposed to extend DRM to FM bands THALES COMMUNICATIONS
16
TECHNOLOGIES RADIO & SIGNAL UNIT
17
Voice coders: Standards and Performances Research coders Existing products
Indicative Quality (MOS) 5
HSX (96)
STG 4591 MELP (02)
WBLBR
2
G 728 (92)
G 723-1 CELP (96)
4 3
G 729 (96)
VLBR ST 4198 (87) ST 4479 (93)
FS 1016 (90)
GSM (87)
G726 (88)
G711 (72)
ST4209 (83)
LPC 10 (83)
1
1k
2k
Parametric coders THALES COMMUNICATIONS
4k
8k Hybrid coders
16k
32k
64k
Waveform coders
Bit rate (bits/s)
TECHNOLOGIES RADIO & SIGNAL UNIT
18
Voice coders: quality Indicative Quality (MOS) 5
G.711 (64 kb/s)
G.721 (32 kb/s)
4
G.728 G.729 (16 kb/s) (8 kb/s)
G.xxx (4 kb/s)
Minimum qual. for high cost application
Consumer quality
3 2
STG 4198 LPC (2,4 kb/s)
STG4591 HSX (2,4 kb/s) (2,4 kb/s 1.2 kb/s)
Minimum qual. For low cost application
1 1970
1980
THALES COMMUNICATIONS
1990
2000
2010
TECHNOLOGIES RADIO & SIGNAL UNIT
Other low rate voice coders z ITU 4 kbits/s : no selection yet between the various
proponents z DVSI : proprietary format (IMBE and AMBE: 2 to 9.6
kbits/s) mainly chosen for satellite communications systems (Inmarsat), Iridium and APCO 25 z Texas MELP : basis for the STG 4591 Stanag z Except for ITU 4kbits/s, all have rather high processing
delay implying long PTT return time
THALES COMMUNICATIONS
19
TECHNOLOGIES RADIO & SIGNAL UNIT
Amateur Radio Demonstrator z Adaptation of the DRM reference receiver for 3 kHz channels z Push-to-talk z Various modes according to : Î Voice coder rate : 1200, 2400, 3200 bits/s (4000-4800 pending) Î Modem robustness Î Choice will be made during lab and fields experiments z 100% PC based for simple integration z Full demonstrator working with Ten-Tec and Kenwood off-
the-self transceivers z Across the Atlantic tests planned for 2002 with ARRL THALES COMMUNICATIONS
20
TECHNOLOGIES RADIO & SIGNAL UNIT
MMI in transmit mode
THALES COMMUNICATIONS
21
TECHNOLOGIES RADIO & SIGNAL UNIT
MMI in receive mode
THALES COMMUNICATIONS
22
TECHNOLOGIES RADIO & SIGNAL UNIT
CONCLUSIONS z DRM World-wide standard is a good technology basis
for Ham z Narrow band, PTT mode easily derived for HF Ham use z Available low bit rate vocoder quality reached acceptable
quality z ARRL plans lab tests then trans-atlantic tests in 2002
THALES COMMUNICATIONS
23
TECHNOLOGIES RADIO & SIGNAL UNIT
Thank you for your attention
Questions ??
THALES COMMUNICATIONS
24
TECHNOLOGIES RADIO & SIGNAL UNIT
THALES COMMUNICATIONS
25
TECHNOLOGIES RADIO & SIGNAL UNIT Australia: China: Canada: Czech R. Croatia Egypt: Ecuador: France: Finland: Germany: Hungary: India: Italy: Japan: Luxembourg Malaysia: Netherlands: Nigeria: Norway: New Zealand: Russia: Spain: Sweden: Switzerland: Tunesia: UK: USA:
FARB Academy of Broadcasting Science Radio Canada International, Nautel Ltd HFCC RIZ Egyptian Radio and Television Union ESPOL, HCJB Atmel, CCETT, Europe 1, Radio France, Radio France Int., TDF, Thales Kymenlaakso Polytechnic APR, Digitalrundfunk Sachsen Anhalt, DLM, DTAG, DW, DLR, FHG, IRT, Micronas, Robert Bosch, Sony Intern., SWR, Telefunken Sendertechnik,, U. of Hanover, U. of Merseburg, U. of Ulm, VPRT Communication Authority, Antenna Hungaria All India Radio RAI Hitachi Kokusai, JVC, NHK Broadcasting Centre Europe (RTL-CTL) ABU Nozema, Radio Nederland Wereldomroep Voice Of Nigeria Telenor Radio NZ Int. Main Centre for Control of Broadcasting Networks and the Voice of Russia Retevision, Universidad del Pais Vasco Coding Technologies, Radio Sweden Int., TERACOM SE, Factum Electronics AB EBU, ITU, ICRC Arab State Broadcasting Union BBC, Christian Vision, LSI Logic, Merlin Com. Int., Qinetiq Ltd, Roke Manor Research Ltd., RadioScape Continental Electronics Corp., Harris Corp., Sangean America, TCI, IBB/VOA, NASB
THALES COMMUNICATIONS
26
TECHNOLOGIES RADIO & SIGNAL UNIT
27
DIAM Chipset RF Analogue Front-End
RF Digital Front-End FM input
Switch Matrix DDC2
AM input DDC1
ANALOG CHIP
APB bus
Audio output Host processor
Audio interface
Initial Synchro
Symbols Demodulation
MLC decoder: Viterbi decoding processor (HW)
D-Cache 8 kbytes
USB (or other) interface
Ext. data mem. 4 Mbit SRAM
I-Cache 8 kbytes
MLC decoder: control part (SW) Demux
I-TCM
32 kbytes
D-TCM
64 kbytes
Audio decoders
MMI and data services
DIGITAL CHIP THALES COMMUNICATIONS
Ext. prog. mem. 2 Mbit Flash DMA
APB bridge
AHB
Internal controls and configurations
Ext. data mem. 8 Mbit SRAM
Narrow-band jammer rejection
Ext. prog. mem. 2 Mbit Flash
TECHNOLOGIES RADIO & SIGNAL UNIT
Demonstrator Description Î Can transmit at the same time vocoded voice + data
(text message, text files, image files...) Î available HSX vocoders : 1200 b/s, 2400 b/s, 3200 b/s (easy addition of other vocoders) Î Can receive both DRM and SSB Ê SSB : audio ouput is the SSB audio Ê DRM : audio output is the vocoder output. In this case, also displays frame error rate, frequency offset, estimated SNR, estimated channel impulse response (in 3D representation)
Î 3 degrees of protection : Ê GND (Ground-wave) for short distance communication Ê SKY (Sky Wave) for long distance Ê ROB (Robust) for difficult conditions
Î Choice between short and long interleaving
THALES COMMUNICATIONS
28
TECHNOLOGIES RADIO & SIGNAL UNIT
Demonstrator Main Features z A simple hardware interfacing system with Radio-Amateur
transceivers Î levels adaptations Î Push-To-Talk detection Î an adjustable VOX system Î receiving level monitoring (if available)
z Easy personalisation Î one editable text file defines the preferred starting options Î one additional editable text file (Settings.cmd) allows adjusting other parameters (thresholds, gains, squelch level...)
THALES COMMUNICATIONS
29
TECHNOLOGIES RADIO & SIGNAL UNIT
Other features z Automatic re-programming of the receiver according to the z z z z z z
currently received message Integrated auto-test Sophisticated channel simulator (for checking performances in terms of SNR, frequency offset, channel severity) PTT test Monitoring level test Transmission of a pure tone instead of the DRM signal Local vocoder auto-test
THALES COMMUNICATIONS
30
