Harbin Institute of Technology (Weihai) 1 Chapter 3 Channel Modeling  Large-scale effects  Small-scale effects  Undesired signals (noise and interfering.

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Presentation transcript:

Harbin Institute of Technology (Weihai) 1 Chapter 3 Channel Modeling  Large-scale effects  Small-scale effects  Undesired signals (noise and interfering signals)

Harbin Institute of Technology (Weihai) Large-Scale Channel Modeling  The signal attenuation with distance (Path Loss)  Free-space path loss modeling: the Friis Transmission Formula( 功率传播方程 ) Flux density( 流量密度 )

Harbin Institute of Technology (Weihai) 3

4

5

6

7  Conclusion: The path loss, or more accurately the spreading loss, in free-space is not frequency dependent.

Harbin Institute of Technology (Weihai) 8

9

10  Path Loss Modeling for Non-Free-Space Environments  Average Path Loss of a Narrow band system  For UWB, n is almost constant with frequency.

Harbin Institute of Technology (Weihai) 11

Harbin Institute of Technology (Weihai) 12 Small-scale channel modeling  Include the small-scale fading in a local environment as well as the distortion of the transmitted waveform due to multipath.  Statistical modeling needed for proper receiver design. (evaluation of the receiver, diversity mechanisms, and potential multiple antenna applications)

Harbin Institute of Technology (Weihai) 13 Statistical modeling of the channel impulse response

Harbin Institute of Technology (Weihai) 14 Saleh-Valenzuela Model  L is the number of paths per cluster and K is the number of clusters.  The basic assumption behind this model is that the multipath components arrive in clusters.  The cluster arrivals are described by a Poisson process.

Harbin Institute of Technology (Weihai) 15 Other models  Delta-K model  Single Poisson model  Modified Poisson model  Split-Poisson model

Harbin Institute of Technology (Weihai) 16 Chapter4 Antennas

Harbin Institute of Technology (Weihai) 17 Resonant monopole

Harbin Institute of Technology (Weihai) 18

Harbin Institute of Technology (Weihai) 19

Harbin Institute of Technology (Weihai) 20 Archimedean Spiral- a frequency independent antenna

Harbin Institute of Technology (Weihai) 21

Harbin Institute of Technology (Weihai) 22

Harbin Institute of Technology (Weihai) 23 TEM Horn- a UWB antenna

Harbin Institute of Technology (Weihai) 24

Harbin Institute of Technology (Weihai) 25

Harbin Institute of Technology (Weihai) 26 summary

Harbin Institute of Technology (Weihai) 27