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UWB Pulse Based Test-Beds for Communication and Radar

UWB Pulse Based Test-Beds for Communication and Radar. Thomas Buchegger Linz Center of Mechatronics - ICIE Alexander Reisenzahn University of Linz – IME. Outline. UWB Communication Test-Beds Human Tissue Penetrating Radio Link Prototype Cochlear Implant Application

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UWB Pulse Based Test-Beds for Communication and Radar

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  1. UWB Pulse Based Test-Beds for Communication and Radar Thomas Buchegger Linz Center of Mechatronics - ICIE Alexander Reisenzahn University of Linz – IME

  2. Outline • UWB Communication Test-Beds • Human Tissue PenetratingRadio Link Prototype • Cochlear Implant Application • PPM Test-Bed with Synchronization • Phase Modulated Transmitted Reference Systems • UWB Radar 2

  3. Communication Test-Beds 3

  4. Human Tissue PenetratingRadio Link Prototype • Modulation: On-Off Keying • PRF: 40 MHz • Data rate: 1.2 Mbps • Range: 1 m • Receiver: non-coherent detector • Power consumption (Rx): 20 mW Rx with Backward Diode: 0 mW UWB transmitter UWB detector receiver 4

  5. Human Tissue PenetratingRadio Link Prototype – The Chochlear Implant Application outside componts of a chochlea implant UWB transmit signal • high power consumption • optical unfavorable 5

  6. transmitter channel receiver LNA OPA UWB transmitter radio channel LP ADC PD oscilloscop PD micro controller external clock (Information) local oscillator UWB reference pulse DDS UWB PPM Test-Bed with Synchronization • block schematic of the prototype 6

  7. UWB PPM Test-Bed with Synchronization Results: UWB PPM transmitter step recovery diodes data rate of 10Mbps UWB PPM coherent receiver correlation Receiver DDS for synchronization Synchronization algorithm: clock synchronization < 100 ppm data synchronization < 5 ms UWB PPM and OOK test bed 7

  8. Pulse-Based Modulation Schemes 8

  9. PMTR UWB Systems • Fast and easy synchronization with an integrating controller • Only one broadband mixer in the receiver • One pulse per bit 9

  10. EPMTR Transmitter and Receiver 10

  11. Simulation – DHTR, PMTR, EPMTR Systems DHTR in CM1 with 10 Mbps Comparison in AWGN channel PMTR in CM1 with 10 Mbps 11

  12. PMTR - Hardware – Test-Bed Pulse generator of an UWB PMTR system PMTR transmitter Transmit pulses of a PMTR system 12

  13. Radar Test-Bed 13

  14. UWB-Radar Test-Bed Principle Radar test-bed block diagram 14

  15. Transmitter – Pulse generation with D-Latch and single bipolar transistor • TTL-outputsignal drives transistor into saturation • Due to the step recovery effect a steep rising edge at the collector is generated • Differentiation with a short circuited stub • Elimination of the negative components with a clipping diode Pulse generation circuitry 15

  16. Transmitter – Pulse generation with D-Latch and single bipolar transistor Output pulse Spectrum of the output pulse combined with the FCC indoor radiation mask 16

  17. Receiver – Sequential Sampling 17

  18. Receiver - Sampling Phase Detector • Step recovery diode generates step functions • Capacitors differentiate the steps to pulses and act as a filter for low frequencies • Schottky diodes are turned on by the pulses 18

  19. Receiver – Down Conversion Pulse original Pulse downconverted 19

  20. Measurements Conversion gain 1-dB compression point 20

  21. Measurements • 1 dB-Compression Dynamic Range: > 42 dB • Receiver Sensitivity: -43 dBm Propagation delay 21

  22. UWB Radar Test-Bed • No biasing • Low cost off the shelf components • FR4 PCB-material • Single 5 V power supply • Data transfer with USB-interface Radar test-bed 22

  23. 23

  24. Receiver – Downconverter with SPD Down converter circuitry with SPD 24

  25. Receiver – Downconverter Bandwidth • Bandwith is depending on the sampling pulse duration: • Pulse duration approximately the transit time of the SRD 25

  26. Transmitter - Pulse Generation • D-Latch combined with step recovery diodes (SRD) • D-Latch combined with a single bipolar transistor 26

  27. +5V L1 C1 C2 C3 D2 in D1 out GND I1 I2 Transmitter - D-Latch with SRD • Both SRDs biased in forward direction • D1 used for steepening the rising edge • D2 used for steepening the falling edge • Capacitors for DC-decoupling 27

  28. Transmitter - D-Latch with SRD TTL Pulse UWB Pulse Input- and Output-Pulse Prototype 28

  29. UWB PPM Test-Bed with Synchronization pulse repetition time Rx Signal necessary new pulse repetition time for a pulse shift of tPOS is used within the time tMC. Template Signal example: tPOS = 38 ps fPRF = 10 MHz f = 507 Hz tMC  = 750 ns 29

  30. EPMTR Transmitter and Receiver 30

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