ARD9900ARD9900Fast Radio ModemFast Radio Modem
Digital Ready on Digital Ready on HF !HF !
11..DigitalDigital VoiceVoice
2. Digital Picture 2. Digital Picture
3. Digital Data3. Digital DataAnalog Radio
ConventionalConventional
No Modification!No Modification!
ARD9900ARD9900 Front ViewFront View
ARD9900ARD9900 Rear ViewRear View
ARD9900ARD9900 Video MemoryVideo Memory
OFDM ModemOFDM Modem
SpectrumSpectrum
OFDMOFDM WaveFormWaveForm
Digital VoiceDigital Voice
�� Totally Totally Encrypted (2Encrypted (2Encrypted (2Encrypted (2Encrypted (2Encrypted (2Encrypted (2Encrypted (271 71 71 71 71 71 71 71 code based keycode based keycode based keycode based keycode based keycode based keycode based keycode based key))))))))
�� Amazing Voice Quality (Amazing Voice Quality (AMBEAMBEAMBEAMBEAMBEAMBEAMBEAMBE2020)2020)
�� Easy interfaceEasy interface with TX/RX (MIC/SP)with TX/RX (MIC/SP)
�� Keep Keep High qualityHigh quality in Heavy Fading channelin Heavy Fading channel
�� Wide range Wide range AFCAFC for for SSBSSB OperationOperation
�� Easy Easy cross operationcross operation Analog Analog -- DigitalDigital
�� AutoAuto Detection of Digital VoiceDetection of Digital Voice
EncryptionEncryption
User Defined MasterKeyMasterKey 12digits
AlgorithmAlgorithmID 7bits
AirKeyAirKey 16bits
EncryptionEncryption
AlgorithmAlgorithm
ProcessorProcessor
Encryption Code
Tabble GEN.
Digital Code SquelchDigital Code Squelch
User IDUser ID 5digits
ID MaskID Mask 5digits
HierarchicalHierarchical
SquelchSquelch
ProcessorProcessor
Voice ProcessVoice Process
MIC
ADC Vocoder
AMBE
OFDM
ModulatorDAC
ADCOFDM
Demodulator
Vocoder
AMBEDAC
SP
( ( ( ( T X )T X )T X )T X )
( R X )
EncryptionEncryption
DeDe--
EncryptionEncryption
AMBE2020 AMBE2020 VocoderVocoder
8KHz Sampling Voice
2400bps
+
1200bps FEC
Digital Digital
PicturePicture
�� Totally Totally EncryptedEncrypted
�� Video CaptureVideo Capture from the NTSC videofrom the NTSC video
�� NTSCNTSC video video OutputOutput for the Monitorfor the Monitor
�� Powerful Error control (Powerful Error control (FECFEC) )
(Convolution coding + Reed(Convolution coding + Reed--Solomon)Solomon)
�� Flexible Flexible PC interfacePC interface(Up/Down load etc)(Up/Down load etc)
�� 368x240368x240 pels pels Modified JPEG compressionModified JPEG compression
�� AutoAuto Detection of Digital PictureDetection of Digital Picture
Digital Video ProcessDigital Video Process
CameraNTSC
Decoder
Frame
Memory
Compre-
ssion
FEC
Coding
OFDM
Mod.
OFDM
Demod.
Error
Correction
Expan-
sion
Frame
Memory
NTSC
Encoder
Monitor
FEC:Convolution Coding +
Reed-solomon
( T X )
( R X )
Convolution CodingConvolution Coding
IN
I OUT
Q OUT
+
+
Decoding :ViterbiViterbi
ReedReed--Solomon CodingSolomon Coding
(44,36)(44,36)(44,36)(44,36)
G(x)=x8+α176x7+α240x6+α211x5+α253x4
+α220x3+α3x2+α203x+α36
Generator Poly
GF(28)
Digital DataDigital Data
�� Totally Totally EncryptedEncrypted
�� Transmission of Transmission of ASCII or BinaryASCII or Binary packet packet
�� 2Kbyte2Kbyte maximum maximum packetpacket sizesize
�� FECFEC::VitabiVitabi and and ReedReed--solomonsolomon
�� 1,472bps1,472bps throughthrough--put on HF channelput on HF channel
�� AutoAuto Detection Data modeDetection Data mode
Data ProcessData Process
PC
BufferFEC
Coding
OFDM
Mod.
OFDM
Demod.
Error
CorrectionBuffer
ASCII or Binary FEC:Convolution Coding +
Reed-Solomon
( T X )
( R X )PC
MODEM ParametersMODEM Parameters
�� 36 36 carriers DQPSK (Spacing 62.5Hz)carriers DQPSK (Spacing 62.5Hz)
�� 280Hz280Hz ~ ~ 25302530HzHz
�� 50baud/3,600bps50baud/3,600bps
�� AFC AFC ±±125125HzHz
�� 1sec 3 tones Header , 20msec OFDM frame1sec 3 tones Header , 20msec OFDM frame
�� 4msec Guard Interval4msec Guard Interval