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lecture22 - EE455/591 Wire ss C m le om unications Wire...

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EE455/591 EE455/591 Wireless Communications Wireless Communications The Cellular Concept The Cellular Concept Reading: Focus on these notes. Reading: Focus on these notes. Review: Power Budgeting for Cellular Communications Review: Power Budgeting for Cellular Communications Topics: Topics: 1. 1. The Cellular Concept The Cellular Concept 2. 2. Frequency Reuse Factor in Cell Clusters Frequency Reuse Factor in Cell Clusters 3. 3. Calculating Signal to Interference Ratio Calculating Signal to Interference Ratio
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Review: Link Power Budgeting for Cellular Link Transmitter power P T Wavelength λ Distance d Transmitter gain G T Receiver gain G R Extra problem on the ground Distance fading g ( d ) = 10 γ log(2 π d/ λ ): - Power fades faster than inverse square Shadow fading (variable x, with X ~ N ( 0 , σ 2 ) ): - Cluttering varies greatly by location Rayleigh fading ( variable α, with E = α 2 exponentially distributed): - Signal cancelled by out-of-phase multi-paths R T T x R G G P d g P ) ( 10 10 / 2 α =
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Shadow Fading Due to Variation of Cluttering Example: A factory floor suffers from log- normal shadow fading with σ =5dB. What is the probability that shadow fading would reduce SNR by 10dB? Answer:
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This note was uploaded on 11/01/2009 for the course EEE 455 taught by Professor Hui during the Spring '09 term at ASU.

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lecture22 - EE455/591 Wire ss C m le om unications Wire...

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