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
Outlines • IEEE 802.15.4a System Model. • IEEE 802.15.4a Channel Model. • Rake Receiver Models. • Results.
Transmitter • UWB is a nonsinusoidal signal with duration less than 1 ns. • Gaussian Pulse: • 1stderivative Gaussian pulse is used for the simulation.
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
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:
Received signal is given by: • Output of Matched Filter: • Output of FIR filter :