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

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Presentation on theme: "Design and Realization of HF Station Prototype, James Baskaradas #, Anna Lisa Saverino *, Amerigo Capria *. # INGV, Roma * RaSS - CNIT, Pisa."— Presentation transcript:

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 2SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Introduction Introduction Technology Overview Technology Overview Tx/Rx Antenna System Tx/Rx Antenna System Transmitter Architecture Transmitter Architecture Receiver Architecture Receiver Architecture Chirp experiment Chirp experiment PSK experiment PSK experiment Conclusion Conclusion

3 Aim 3SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Design and Development of a Robust HF (shortwave) radio link. Main critical aspects Full transceiver; Low power; Remote controlled; Modular and Reconfigurable

4 Analog 4SWING Final Meeting | CNIT - Pisa, Italy13/12/2013

5 ASIC/SOC 5SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 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

6 Hybrid 6SWING Final Meeting | CNIT - Pisa, Italy13/12/2013

7 Tx/RX Antenna System 7SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Gain(dBi)Frequency(MHz) < >20

8 Transmitter Architecture 8SWING Final Meeting | CNIT - Pisa, Italy13/12/2013

9 Transmitter Architecture:USRP 9SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 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

10 Transmitter Architecture:USRP 10SWING Final Meeting | CNIT - Pisa, Italy13/12/2013

11 Transmitter Architecture: HPA 11SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 TypeClass AB MOSFET Frequency100kHz-30MHz Rated power500W Cooling Forced air, front to rear Mains power V,50-60Hz,single phase, 500VA/750VA/1.5kVA max

12 Receiver Architecture 12SWING Final Meeting | CNIT - Pisa, Italy13/12/2013

13 Receiver Architecture: BPF 13SWING Final Meeting | CNIT - Pisa, Italy13/12/2013

14 Receiver Architecture:LNA 14SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Gain versus frequency Model: ZFL-1000LN+ Company: Mini-Circuits Operative Band 0.1 MHz – 1000 MHz Noise Figure2.9 dB Gain20dB Output power versus frequency Low Noise Amplifier (LNA)

15 Tx/Rx Synchronization 15SWING Final Meeting | CNIT - Pisa, Italy13/12/2013

16 SWING Node locations 16SWING Final Meeting | CNIT - Pisa, Italy13/12/2013

17 Chirp Experiment : why ? 17SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Single reconfigurable hardware for : probing the ionosphere (including non-reciprocity* of channel) HF communication terminal wide band of usable frequency from ionospheric prediction disturbed link channel (ionosphere)

18 Chirp Experiment : How ? 18SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Fine frequency step (0,001Hz) to avoid unwanted noise in the output spectrum

19 Chirp Experiment : Transmitter 19SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Transmitter station Frequency sweep1 MHz – 30MHz Frequency step0,001Hz scan rate<= 100kHz

20 Chirp Experiment : Receiver -1 20SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Spectrum monitor receiver Chirp receiver User Interface of the Spectrum monitor Receiver Receiver station

21 Chirp Experiment : Receiver -2 21SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 User interface of the Chirp Receiver

22 Chirp Experiment : Results -1/2 22SWING Final Meeting | CNIT - Pisa, Italy13/12/2013

23 Chirp Experiment : Results -1/2 23SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Transmitter Power20W Received signal power-95,67dBm

24 Chirp Experiment : Results -2/2 24SWING Final Meeting | CNIT - Pisa, Italy13/12/2013

25 PSK Experiment 25SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Aim Design and Development of a demonstrator for data transmission over HF radio links. ExperimentIssues Extreme space and time-varying propagation channel; External interference (congestion of the HF band); High background noise level.

26 PSK Experiment 26SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 SimulatedScenario Connection type: point-to-point; Carrier frequency : single; Modulation type: PSK. Simulation equipment USRP Hardware; LabVIEW programming language.

27 PSK Experiment 27SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Transmitter functions Convert the message to bits; Rearrange the bit-stream in packets; Apply modulation; Write to USRP for the transmission. Receiver functions Apply demodulation; Check for valid packets and organization in the correct order; Full text reconstruction.

28 PSK Experiment 28SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Transmitter/Receiver User Interface USRP IP Address 1.I/Q rate: Specifies the sample rate of the baseband I/Q data for Tx or Rx in samples per second (S/s); 2.Carrier : Carrier frequency in Hz of the RF signal ; 2.Gain: Specifies the gain, in dB, applied to the RF signal for Rx and Tx;. 2.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. E b /N 0 Specifies the desired Eb/N0 of the output complex waveform in dB; Tx/RX Constellation Graph Specifies the detected symbol locations and the transitions between those symbols; Raw Received Signal Received Message

29 PSK Experiment 29SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Transmitter/Receiver Modulation Interface Modulation Type Pulse shaping and matched Filters This filter is applied to each symbol to: 1.Reduce the amplitude and phase transition of modulated signal; 2.Reduce Inter-Symbol Interference (ISI); 3.Maximize the SNR Sets the type of modulation and parameters for a pulse shaping filter. Spectrum with noise Spectrum of transmitted base-band complex waveform with noise

30 PSK Experiment 30SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Transmitter Packet Interface 1.Guard Band: Protects against the filter effect; 2.Sync Seq: Is the sequence for the carrier and clock recovery; 3.Packet Number: Is used to reorder the packets and to detect missing packets; 4.Data : Represents the length of the useful data; 5.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.

31 PSK Experiment 31SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Receiver Debug Interface Sync Found Checks for valid packet Error out Represents error information Correct Packet Rx Represents the number of the correct received packets

32 Conclusion 32SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Design and Development of the SWING demonstrator Simulation equipment USRP: 1.SDR implementation; 2.Low cost and extremely flexible solution; LabVIEW: 1.General purpose software for data processing and instruments control. Good candidate for the implementation of HF communication because it can directly sample the entire HF band. USRP and HF band

33 Conclusion 33SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 PSK experiment Design and Development of a demonstrator for data transmission over HF radio links (PSK experiment): 1.Modulation type: PSK; 2.Single carrier; Main activities Chirp experiment Frequency selection in order to establish the HF link (Chirp experiment): 1.Ionospheric channel; 2.External noise level; closed-loop configuration additive white Gaussian noise 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.

34 Conclusion 34SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Experimental validation PSK and HF link : Experimental validation Fully Automated System: Realization of a Fully Automated System: 1.Spectral sensing (low noise, HF band occupancy); 2.Ionospheric monitoring; 3.Optimal frequency selection (chirp system); 4.Data transmission over HF link (PSK system) Future Developments Integration PSK and Chirp demonstrators : Integration

35 35SWING Final Meeting | CNIT - Pisa, Italy13/12/2013 Thank you for your attention! THE END Questions?


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