lecture22

lecture22 - Lecture Outline (Week 12, lecture 2) Wireless...

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Lecture Outline (Week 12, lecture 2) Wireless Communication – The Cellular Concept Reading: Focus on these notes. 1. Signal Strength after Distance, Shadow, and Rayleigh Fading Received Power: dB Rayleigh dB dB absorption dB d dB R dB T dB T dB R L L L L G G P P | | | | | | | | - - - - + + = σ Absorption loss is given by loss (dB) per kilometer times distance. Log-normal loss, due to random barrier clutter, is modeled as a zero-mean Gaussian random variable in dB with given standard deviation in dB. Rayleigh fading results from destructive interference of signals from multiple paths. The CDF of the Rayleigh faded signal E greater than a required r E for given average received strength s E is given by s r E E r e E E P / ) ( - = Outage probability is s r E E r E E e E E P s r / 1 ) ( / - = < - for small s r E E / The outage probability is degraded by a factor s r E E / . In other words, every increase in transmission power by 10dB reduces the outage probability by a factor of 10. In example during last lecture, we have a SNR of 26 dB before log-normal fading
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lecture22 - Lecture Outline (Week 12, lecture 2) Wireless...

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