Wireless Communications Principles and Practice 2 nd Edition T.S. Rappaport Chapter 5: Mobile Radio Propagation: Small-Scale Fading and Multipath as it.

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Presentation transcript:

Wireless Communications Principles and Practice 2 nd Edition T.S. Rappaport Chapter 5: Mobile Radio Propagation: Small-Scale Fading and Multipath as it applies to Modulation Techniques

Doppler Shift Geomerty

Channel issues

Complex Baseband model for RF systems

Time-varying impulse response

Measured impulse responses

Channel Sounder: Pulse type

Channel Sounder: PN Type

Channel Sounder: Swept Freq. type

Measured power delay profiles

Indoor Power Delay Profile

Typical RMS delay spreads

Two independent fading issues

Flat-fading (non-freq. Selective)

Frequency selective fading

Two independent fading issues

Rayleigh fading

Small-scale envelope distributions

Ricean and Rayleigh fading distributions

Small-scale fading mechanism

Doppler spectrum

Spectrum of Envelope of doppler faded signal

Simulating Doppler/Small-scale fading

Simulating Doppler fading

Simulating multipath with Doppler- induced Rayleigh fading

Simulating 2-ray multipath

SIRCIM – Simulation of all indoor propagation Characteristics

SMRCIM – Simulation of all outdoor propagation Characteristics

SIRCIM and SMRCIM Available from Wireless Valley Communications, Inc. Source code in C is available www. Wirelessvalley.com

Angular Spread model

Spatial distribution of Multipath

Angular Spread key to fading

Spatial orientation of multipath impacts the depths of fading

Angular Distribution of power

Angular Spread predicts correlation distances