Mohammad Tamim Alkhodary Ali Al- Saihati - PowerPoint PPT Presentation

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Mohammad Tamim Alkhodary Ali Al- Saihati

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  1. King Fahd University of Petroleum & Minerals Electrical Engineering DepartmentEE 578 Simulation of Wireless SystemsIEEE 802.15.4a UWB Transmitter and Receiver ModelCase IV Mohammad TamimAlkhodary Ali Al-Saihati

  2. Outlines • IEEE 802.15.4a System Model. • IEEE 802.15.4a Channel Model. • Rake Receiver Models. • Results.

  3. System Model

  4. Transmitter • UWB is a nonsinusoidal signal with duration less than 1 ns. • Gaussian Pulse: • 1stderivative Gaussian pulse is used for the simulation.

  5. Channel Model • The proposed rates for the channel are between 1 kb/s and several Mb/s. • Channel model is a modified version of the original Saleh-Valenzuela (S-V). • The impulse response of the S-V model is given by: • The two dimensional model can be reduced into one dimensional discrete model. • Model includes a mixed Poisson distribution for ray arrival times - possible delay dependence of cluster decay times- frequency dependence of the path loss

  6. RAKE Receiver for UWB Systems • A typical rake combiner is limited by power consumption, design complexity, and the channel estimation. • Output of fingers is given by: • Output of the rake receiver:

  7. Rake Receiver- Correlators

  8. Rake Receiver-Matched Filter

  9. Received signal is given by: • Output of Matched Filter: • Output of FIR filter :

  10. FIR Implementation

  11. Simulation Results:Transmitted signals

  12. Signal Responses Through the Channel

  13. Received Noisy Signals

  14. Received Signals

  15. Thank You