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© 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Wireless Communications Principles and Practice 2 nd Edition T.S. Rappaport.

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Presentation on theme: "© 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Wireless Communications Principles and Practice 2 nd Edition T.S. Rappaport."— Presentation transcript:

1 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. 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

2 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Doppler Shift Geomerty

3 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Channel issues

4 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Complex Baseband model for RF systems

5 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Time-varying impulse response

6 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Measured impulse responses

7 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Channel Sounder: Pulse type

8 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Channel Sounder: PN Type

9 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Channel Sounder: Swept Freq. type

10 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Measured power delay profiles

11 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Indoor Power Delay Profile

12 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Typical RMS delay spreads

13 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Two independent fading issues

14 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Flat-fading (non-freq. Selective)

15 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Frequency selective fading

16 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Two independent fading issues

17 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Rayleigh fading

18 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Small-scale envelope distributions

19 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Ricean and Rayleigh fading distributions

20 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Small-scale fading mechanism

21 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Doppler spectrum

22 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Spectrum of Envelope of doppler faded signal

23 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Simulating Doppler/Small-scale fading

24 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Simulating Doppler fading

25 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Simulating Doppler fading

26 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Simulating multipath with Doppler- induced Rayleigh fading

27 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Simulating 2-ray multipath

28 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. SIRCIM – Simulation of all indoor propagation Characteristics

29 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. SMRCIM – Simulation of all outdoor propagation Characteristics

30 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. SIRCIM and SMRCIM Available from Wireless Valley Communications, Inc. Source code in C is available www. Wirelessvalley.com

31 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Angular Spread model

32 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Spatial distribution of Multipath

33 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Angular Spread key to fading

34 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Spatial orientation of multipath impacts the depths of fading

35 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Angular Distribution of power

36 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Angular Spread predicts correlation distances

37 © 2002 Pearson Education, Inc. Commercial use, distribution, or sale prohibited. Angular Spread predicts correlation distances


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