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D-STAR

D-STAR. A New Way to Communicate. Digital Radio System Open System Not Encrypted JARL. 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

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D-STAR

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  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 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) 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 backbone repeater 10GHz 90cmφ parabola antenna

  13. Composition of the repeater site

  14. Repeater site details

  15. RX Antenna RX TX Antenna BRａ ＴＸ TX BRａ RＸ CNT b BRb ＴＸ CNT c BRb RＸ TX Antenna CNT d Tel.Line BRａ ＴＸ 13.8V TX RX Antenna BRａ RＸ Local Repeater ａ 13.8V RX Antenna RX TX Antenna RX Backbone Repeater a TX CNT b 13.8V Local Repeater b RX Antenna TX Antenna RX TX CNT c TX Antenna TX 13.8V BRb ＴＸ RX Antenna BRb RＸ Local Repeater c RX Antenna RX 13.8V TX Antenna RX Backbone Repeater b TX CNT d 13.8V Telephone Line Local Repeater d DC 13.8V Conneter 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. ATM　Ｃｅｌｌ (53byte) → Ｐａｙｌｏａｄ Ｐａｙｌｏａｄ Ｐａｙｌｏａｄ Header Header Header 5byte 48byte 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

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