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

1 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 Doppler Shift Geomerty

3 Channel issues

4 Complex Baseband model for RF systems

5 Time-varying impulse response

6 Measured impulse responses

7 Channel Sounder: Pulse type

8 Channel Sounder: PN Type

9 Channel Sounder: Swept Freq. type

10 Measured power delay profiles

11 Indoor Power Delay Profile

12 Typical RMS delay spreads

13 Two independent fading issues

14 Flat-fading (non-freq. Selective)

15 Frequency selective fading

16 Two independent fading issues

17 Rayleigh fading

18 Small-scale envelope distributions

19 Ricean and Rayleigh fading distributions

20 Small-scale fading mechanism

21 Doppler spectrum

22 Spectrum of Envelope of doppler faded signal

23 Simulating Doppler/Small-scale fading

24 Simulating Doppler fading

25

26 Simulating multipath with Doppler- induced Rayleigh fading

27 Simulating 2-ray multipath

28 SIRCIM – Simulation of all indoor propagation Characteristics

29 SMRCIM – Simulation of all outdoor propagation Characteristics

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

31 Angular Spread model

32 Spatial distribution of Multipath

33 Angular Spread key to fading

34 Spatial orientation of multipath impacts the depths of fading

35 Angular Distribution of power

36 Angular Spread predicts correlation distances

37


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