Estimation and analysis of propagation channels based on stochastic methods Binh Tran – Manoj Adhidari ECEn Project Brigham Young University Binh Tran1

Satellite communication Applications Multi paths environment Rayleigh channel model pdf/ CDF of E field pdf/CDF of SNR Single Tx, single Rx Single Tx, multiple Rx Selection Diversity Future Work Binh - Manoj2

Satellite communication: Wireless form of communication between two satellites satellite and multiple antennas Applications: Wide area network communications, weather forecasting, radio communication, internet access, global position system This project: Satellite is the fixed transmitter Dish antenna as a moving receiver Array antenna at receiver Scatters randomly located between Tx/Rx Signal uncorrelated 3 Binh - Manoj

Multipath Effects: Reflection from earth Blockage or shadowing Diffraction Interference due to multipath Propagation Chanel: Characterize multipath effects Long term averaged signal reduction Distance between the Tx and Rx Rayleigh Channel Model: No strong line of sight between Tx and Rx Uncorrelated signals The reflections add coherently at the receiver Fading phase differences between propagation paths Pdf of E is Rayleigh distribution 4 Binh - Manoj

Rayleigh Model : pdf of electric field CDF of electric field Electric field model 5 SNR: Mean SNR Pdf of SNRCDF of SNR More scatters, more loss More dense (small variance), more loss Nscat = 10 R = 100 m Var = 10*R Binh - Manoj

One branch the probability of the received SNR Probability that all M branches will have SNR less than threshold Average SNR 6 Nscat = 50 R = 100 m Var = 10*R Binh - Manoj Higher number of antenna, the probability of getting SNR is better Higher the number of element, antenna steeper the slope of the CDF

7 Binh - Manoj More antenna at receiver, better SNR Improvement is not linear with increasing number of receiver antennas

8 Binh - Manoj Raleigh Fading occurs in a no line of sight propagation environment Various probability distributions were plotted which characterized the SNR SNR for multiple receiver system was also obtained and discussed The results obtained from simulation matched well with the theoretical results Depending on different applications, assumptions and models were used This model helps us analyze and predict the performance of the system The future work will focus on applying different algorithms to estimate the propagation channels and steering beam pattern for maximum SNR

Acknowledgements: Dr. Mazzeo for his help and guidance Classmates for their opinions, suggestions and discussions 9 Binh - Manoj