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Design and Realization of HF Station Prototype

Design and Realization of HF Station Prototype. James Baskaradas # , Anna Lisa Saverino * , Amerigo Capria * . # INGV, Roma * RaSS - CNIT, Pisa. Overview of the presentation. Introduction Technology Overview Tx / Rx Antenna System Transmitter Architecture Receiver Architecture

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Design and Realization of HF Station Prototype

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  1. Design and Realization of HF Station Prototype James Baskaradas#, Anna Lisa Saverino*, Amerigo Capria*. #INGV, Roma *RaSS - CNIT, Pisa

  2. Overview of the presentation • Introduction • TechnologyOverview • Tx/Rx Antenna System • TransmitterArchitecture • ReceiverArchitecture • Chirpexperiment • PSK experiment • Conclusion SWING Final Meeting | CNIT - Pisa, Italy

  3. Aim Design and Development of a Robust HF (shortwave) radio link. • Full transceiver; • Low power; • Remote controlled; • Modular and Reconfigurable Main critical aspects SWING Final Meeting | CNIT - Pisa, Italy

  4. Analog SWING Final Meeting | CNIT - Pisa, Italy

  5. ASIC/SOC High resolution TDC 25 ps binning ~5 man years design ~2 man years test and design fix Total design price: ~1 million $ Production cost: 10$/chip Production volume: ~50k chips Total production cost: 500k$ Image from presentation of Dr.,Jorgen Christiansen,CERN SWING Final Meeting | CNIT - Pisa, Italy

  6. Hybrid SWING Final Meeting | CNIT - Pisa, Italy

  7. Tx/RX Antenna System SWING Final Meeting | CNIT - Pisa, Italy

  8. TransmitterArchitecture SWING Final Meeting | CNIT - Pisa, Italy

  9. TransmitterArchitecture:USRP • Dual 100MS/s, 14-bit ADC; • Dual 400MS/s, 16-bit DAC; • DDC/DUC with 25mHz resolution; • Up to 50MS/s Gigabit Ethernet streaming; • Gigabit Ethernet interface to host; • Fully coherent MIMO capability. USRP N210 features SWING Final Meeting | CNIT - Pisa, Italy

  10. TransmitterArchitecture:USRP SWING Final Meeting | CNIT - Pisa, Italy

  11. TransmitterArchitecture: HPA SWING Final Meeting | CNIT - Pisa, Italy

  12. ReceiverArchitecture SWING Final Meeting | CNIT - Pisa, Italy

  13. ReceiverArchitecture: BPF SWING Final Meeting | CNIT - Pisa, Italy

  14. ReceiverArchitecture:LNA • Model: ZFL-1000LN+ • Company: Mini-Circuits Low Noise Amplifier (LNA) Output power versus frequency Gain versus frequency SWING Final Meeting | CNIT - Pisa, Italy

  15. Tx/RxSynchronization SWING Final Meeting | CNIT - Pisa, Italy

  16. SWING Nodelocations SWING Final Meeting | CNIT - Pisa, Italy

  17. ChirpExperiment : why ? • wide band of usable frequency from ionospheric prediction • disturbed link channel (ionosphere) • Single reconfigurable hardware for : • probing the ionosphere (including non-reciprocity* of channel) • HF communication terminal SWING Final Meeting | CNIT - Pisa, Italy

  18. ChirpExperiment : How ? Fine frequency step (0,001Hz) to avoid unwanted noise in the output spectrum SWING Final Meeting | CNIT - Pisa, Italy

  19. ChirpExperiment : Transmitter Transmitter station SWING Final Meeting | CNIT - Pisa, Italy

  20. ChirpExperiment : Receiver -1 • Spectrum monitor receiver • Chirp receiver Receiver station User Interface of the Spectrum monitor Receiver SWING Final Meeting | CNIT - Pisa, Italy

  21. ChirpExperiment : Receiver -2 User interface of the Chirp Receiver SWING Final Meeting | CNIT - Pisa, Italy

  22. ChirpExperiment : Results -1/2 SWING Final Meeting | CNIT - Pisa, Italy

  23. ChirpExperiment : Results -1/2 13/12/2013 SWING Final Meeting | CNIT - Pisa, Italy 23

  24. ChirpExperiment : Results -2/2 SWING Final Meeting | CNIT - Pisa, Italy

  25. PSK Experiment Design and Development of a demonstrator for data transmission over HF radio links. Aim • Extreme space and time-varying propagation channel; • External interference (congestion of the HF band); • High background noise level. Experiment Issues SWING Final Meeting | CNIT - Pisa, Italy

  26. PSK Experiment Connection type: point-to-point; Carrier frequency : single; Modulation type: PSK. Simulated Scenario Simulationequipment USRP Hardware; LabVIEW programming language. SWING Final Meeting | CNIT - Pisa, Italy

  27. PSK Experiment Receiverfunctions Transmitterfunctions • Apply demodulation; • Check for valid packets and organization in the correct order; • Full text reconstruction. Convert the message to bits; Rearrange the bit-stream in packets; Apply modulation; Write to USRP for the transmission. SWING Final Meeting | CNIT - Pisa, Italy

  28. PSK Experiment Transmitter/Receiver User Interface Raw Received Signal Received Message USRP IP Address • I/Q rate: Specifies the sample rate of the baseband I/Q data for Tx or Rx in samples per second (S/s); • Carrier : Carrier frequency in Hz of the RF signal; • Gain: Specifies the gain, in dB, applied to the RF signal for Rx and Tx;. • TX/RX antenna: Refers to the connectors on the device front panel; Actual TX/RX Parameters Refers to a Tx/Rx values supported by the device. Tx/RX Constellation Graph Specifies the detected symbol locations and the transitions between those symbols; Eb/N0 Specifies the desired Eb/N0 of the output complex waveform in dB; SWING Final Meeting | CNIT - Pisa, Italy

  29. PSK Experiment Transmitter/ReceiverModulation Interface Sets the type of modulation and parameters for a pulse shaping filter. Modulation Type Spectrum with noise Spectrum of transmitted base-band complex waveform with noise Pulse shaping and matched Filters This filter is applied to each symbol to: • Reduce the amplitude and phase transition of modulated signal; • Reduce Inter-Symbol Interference (ISI); • Maximize the SNR SWING Final Meeting | CNIT - Pisa, Italy

  30. PSK Experiment TransmitterPacket Interface • Guard Band: Protects against the filter effect; • Sync Seq: Is the sequence for the carrier and clock recovery; • Packet Number: Is used to reorder the packets and to detect missing packets; • Data : Represents the length of the useful data; • Pad Data: Represents the number of the samples appended at the end of the signal in order to have a constant packet size; Constellation Graph: Shows how the detected symbol locations and the transitions between those symbols are modified by the presence of the noise. SWING Final Meeting | CNIT - Pisa, Italy

  31. PSK Experiment ReceiverDebug Interface Error out Represents error information Correct Packet Rx Represents the number of the correct received packets Sync Found Checks for valid packet SWING Final Meeting | CNIT - Pisa, Italy

  32. Conclusion Design and Development of the SWING demonstrator Simulation equipment • USRP: • SDR implementation; • Low cost and extremely flexible solution; • LabVIEW: • General purpose software for data processing and instruments control. USRP and HF band Good candidate for the implementation of HF communication because it can directly sample the entire HF band. SWING Final Meeting | CNIT - Pisa, Italy

  33. Conclusion Mainactivities • Frequency selection in order to establish the HF link (Chirp experiment): • Ionospheric channel; • External noise level; • Design and Development of a demonstrator for data transmission over HF radio links(PSK experiment): • Modulation type: PSK; • Single carrier; The functionality of the system has been experimentally demonstrated in a closed-loop configuration. Moreover the effect of additive white Gaussian noise has been evaluated by using a set of different signal to noise ratios. SWING Final Meeting | CNIT - Pisa, Italy

  34. Conclusion Future Developments • PSK and Chirp demonstrators : Integration • PSK and HF link : Experimentalvalidation • Realization of a FullyAutomated System: • Spectralsensing (lownoise, HF band occupancy); • Ionosphericmonitoring; • Optimalfrequencyselection (chirpsystem); • Data transmission over HF link (PSK system) SWING Final Meeting | CNIT - Pisa, Italy

  35. THE END Thankyou for yourattention! Questions? SWING Final Meeting | CNIT - Pisa, Italy

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