lecture2 - Lecture 2 EE 359 Wireless Communications Fall...

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Unformatted text preview: Lecture 2 - EE 359: Wireless Communications - Fall 2011 Signal Propagation and Path Loss Models Lecture Outline • Overview of Signal Propagation • Free Space Path Loss Model • Ray Tracing Path Loss Models • Simplified Path Loss Model • Empirical Path Loss Models • Log-Normal Shadowing 1. Signal Propagation Characteristics: • Path loss: power falloff relative to distance • Shadowing: random fluctuations due to obstructions • Flat and frequency selective fading: caused by multipath 2. Transmitted and received signals: • Transmitted Signal: , with power P t , is s ( t ) = <{ u ( t ) e j (2 πf c t ) } = s I ( t ) cos(2 πf c t + φ )- s Q ( t ) sin(2 πf c t + φ ) , where u ( t ) = s I ( t ) + js Q ( t ) is the complex baseband signal with band- width B , f c is the carrier frequency, and φ is the initial phase. For simplicity we assume u ( t ) real for propagation model analysis. • Received signal: r ( t ) = <{ v ( t ) e j (2 πf c t ) } , where v ( t ) = u ( t ) * c ( t ) for c ( t ) the baseband channel model....
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lecture2 - Lecture 2 EE 359 Wireless Communications Fall...

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