DSTAR

1
D-STAR
A New Way to Communicate
2

• Digital Radio System
• Open System
• Not Encrypted
• JARL

3
Requirements of an Amateur Radio Digital System
The terminal is not heavily restricted by the
system Compatibility with the Internet
Necessity for users to be able to make by
themselves Operation as a single system with
sequential expansion possible via
infrastructure maintenance? Necessity for
communication with existing analog systems
4

• Simplex
• Repeaters
• Backbone

• Digital Voice
• High Speed Data

5

• Digital data communication via local repeater.

6

• Digital voice communication via local repeater.

7

• Backbone communication between two repeater sites.

8
Digital transceiver ID-1
9
Block Diagram of ID-1
10
Specification

• Operating Frequency 1.2GHz Amateur Band
• Operating MODE FM (analog voice) (FDMA)
  0.5GMSK (Digital voice / DATA)
• Data Rate 8kbps(voice) / 128kbps(data)
• CODEC ITU G723.1
• Data interface IEEE802.3 (10Base-T )
• RF Power 10W / 1W
• Rx Sensitivity FM
  -16dBu (typical) 8kbps GMSK voice
  -10dBu 128kbps GMSK Data 2dBu
• Switching Time 10mS(Digital mode)
• GMSK Modulation Quadrature Modulator /
  FPGA(Base Band)

11
Local repeaters and antenna
1.2GHz Data Repeater
1.2GHz Voice Repeater
1.2GHz Antenna
12
Backbone repeater and antenna
10GHz 90cmf parabola antenna
10GHz backbone repeater
13
Composition of the repeater site
14
Repeater site details
15
Wire connection of the repeater site
16
Software and protocol

• D-STAR protocol
• Data communication protocol
• Voice communication protocol
• Backbone protocol
• USB of ID-1 control software
• Application software

17
Data communication protocol
Composition of Data packet frame
18
Message transfer
19
Voice communication protocol
Composition of Voice packet frame
20
Backbone protocol
ATM(Asynchronous Transfer Mode)
21
Timing of the backbone signals
22
Remote control by personal computer
23
Applications
The Internet or server access
24
Applications
Small data communications to use data frames in
the voice packet.
25
CODEC
A/D Convert
MIC
Digital signal
ACELP (Algebraic Code Excited Linear Prediction)
(ITU G723.1) AMBE (Advanced Multi-Band
Excitation) VSELP (Vector Sum Exited Linear
Prediction) CELP (Code Exited Linear
Prediction) RELP (Residual Excited Linear
Prediction)
26
ITU G723.1 CODEC
ACELP (Algebraic Code Excited Linear
Prediction) Low bit rate 5.3Kbps (include
6.3Kbps) Frame size 30mS Algorithm delay
37mS
27
AMBE CODEC IC
AMBE Coder divides each segment of speech into
distinct frequency bands. And makes a
voiced/unvoiced decision for each frequency
band. This allows the excitation signal for a
particular speech segment to be a mixture of
periodic and noise-like energy.
28
D-STAR System