Performance_3 - Performance of Communication ystem in...

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Unformatted text preview: Performance of Communication ystem in Fading Channel 1 System in Fading Channel Dr. Essam Sourour Alexandria University, Faculty of Engineering, Dept. Of Electrical Engineering • Performance in AWGN • Outage performance in Fading channels • BER performance in Fading channels Overview 2 Modulation Techniques • Digital signals can be transmitted using several techniques: – BPSK, QPSK, or MPSK – FSK, or MFSK PAM – MPAM – MQAM – Differential methods • Performance in AWGN channels (without fading) is covered in other courses 3 Performance Summary • Some results are given here: 4 ( ) 1 2 2 x Q x erfc = Outage Probability • In a fading channel the received amplitude changes randomly according to some distribution (Rayleigh, Rician, others,..) • Hence, the received power and received SNR re also random are also random • Outage probability is the probability that the received SNR falls below an allowable threshold P s • Threshold P s depends on modulation type and application (voice, data, etc.) 5 Outage Probability in Rayleigh Fading...
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This note was uploaded on 02/07/2012 for the course ELECTRONOC 102 taught by Professor Mouh during the Spring '11 term at Aristotle University of Thessaloniki.

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Performance_3 - Performance of Communication ystem in...

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