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Ultra Wideband Digital Wireless Link

Ultra Wideband Digital Wireless Link. By Matthew Carrier, Nicholas Merrill, Brandon Mui, Justin Burkhart Advisor: Professor R.W. Jackson. What is Ultra Wide Band? . Ultra Wide Band (UWB) uses very low-powered, short pulsed radio signals to transfer data over a wide range of frequencies

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Ultra Wideband Digital Wireless Link

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  1. Ultra Wideband Digital Wireless Link By Matthew Carrier, Nicholas Merrill, Brandon Mui, Justin Burkhart Advisor: Professor R.W. Jackson

  2. What is Ultra Wide Band? • Ultra Wide Band (UWB) uses very low-powered, short pulsed radio signals to transfer data over a wide range of frequencies • FCC Definition: • Signals must occupy bandwidth >500MHz • Or, signal bandwidth is 20% of the carrier frequency

  3. Why do we need Ultra Wide Band? • High-tech designs require portability, speed, & performance • Portability: • UWB use multiple low-powered pulses → low power consumption • UWB data rate is inversely proportional to distance (thus short range) • Speed: • Proposed to be between 40-600 Mb/s, and eventually up to Gb/s • Performance: • Volume of information proportional to the frequency band • More information → better graphics, better resolution for RADAR, etc.

  4. Reference data Reference t data (Transmitted Reference UWB) Transmitted Reference UWB Systems • Standard TR-UWB systems are “dogged” by implementation issues • The receiver requires an extremely wideband delay element • As a solution, Professor Goeckel has developed theory for Slightly Frequency Shifted Reference UWB

  5. Slightly Frequency Shifted UWB • Rather then separating the data from the reference in time, this systems separates them in frequency • Data and Reference pulse must be orthogonal in frequency • This avoids using the extremely wideband delay element in the receiver • Our project is to take Prof. Goeckel’s theory and prove the concept through building a scaled prototype

  6. Deliverables • Transmitter/Receiver Electronics Prototype • Transmitter/Receiver Antenna Prototype • Packaging design is not part of project

  7. Transmitter • Omni antenna • Pulse Generator has pulses with picosecond rise times • Oscillator used for frequency shifting of the pulses • PLD is used for buffering of data PLD Input X Σ Pulser Oscillator X

  8. Receiver • Omni antenna • Oscillator at same frequency and phase as transmitter (sync not yet designed) • PLD is for out-buffering of received data Integrator X PLD Oscillator X

  9. What is Missing? • Need to design circuitry to synchronize the frequency shift oscillators • Need to develop/buy integrator circuitry that can be triggered • Integrator and PLD sampling also have sync issues that need to be worked out • Antenna design has yet to be implemented • An antenna in our channel has already been designed by grad students here at UMASS

  10. Pulse Generation: Closer Look • Create very fast pulses using Step Recover Diodes (SRD)

  11. MDR Specification • Transmitter & Receiver prototype built • Built using modular components connected with coaxial cable • No synchronization circuitry implemented • No antenna implemented • Antenna design & prototype built • Tested for gain, return loss, & radiation patterns • Synchronization Circuitry • Will be designed independently from the prototype

  12. Questions/Suggestions? ?

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