1. A New Way to Communicate
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 user’s 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) GMSK (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 dBu (typical) 8kbps GMSK voice dBu kbps 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. 10GHz 90cmφ parabola antenna
Backbone repeater and antenna
10GHz backbone repeater
10GHz 90cmφ parabola antenna

13. Composition of the repeater site

14. Repeater site details

15. Wire connection of the repeater site
TX Antenna TX
Antenna
Conneter RX
CNT b
13.8V
Local Repeater b
CNT c
Local Repeater c
RX Antenna
CNT d
Local Repeater d
BRb RＸ
BRb ＴＸ
Backbone Repeater b
BRａ ＴＸ
BRａ RＸ
Local Repeater ａ
Tel.Line
DC 13.8V
Telephone
Line
Backbone Repeater a
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. Composition of Data packet frame
Data communication protocol
Composition of Data packet frame

18. Message transfer

19. Composition of Voice packet frame
Voice communication protocol
Composition of Voice packet frame

20. Backbone protocol ＡＴＭ（Asynchronous Transfer Mode） Header Ｐａｙｌｏａｄ
ATM　Ｃｅｌｌ (53byte) →
48byte
5byte
Header
Ｐａｙｌｏａｄ

21. Timing of the backbone signals

22. Remote control by personal computer

23. The Internet or server access
Applications
The Internet or server access

24. Small data communications to use data frames in the voice packet.
Applications
Small data communications to use data frames in the voice packet.

25. CODEC ・ACELP (Algebraic Code Excited Linear Prediction) (ITU G723.1)
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. ・ACELP (Algebraic Code Excited Linear Prediction)
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