Fast Wideband Electromagnetic Modeling of Indoor Wireless Channels Abbas Alighanbari Supervised by: Prof. Costas D. Sarris The Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto

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Fast Wideband Electromagnetic Modeling of Indoor
Wireless ChannelsAbbas Alighanbari Supervised
by Prof. Costas D. SarrisThe Edward S. Rogers
Sr. Department ofElectrical and Computer
EngineeringUniversity of Toronto
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OUTLINE

• Introduction
• - Numerical Electromagnetics
• Methodologies
• - High-order Time-Domain Techniques (S-MRTD
  v.s. FDTD)
• Applications to Wireless Communications
• - Signal Fading Predictions
• - Wideband Characteristics
• - Optimum Signal Transmission and Detection
• Future Work and Conclusions

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Numerical Electromagnetics

• Method of Moments and Finite Elements
• RF systems
• wireless communications
• EMC compliance
• Time-Domain
• - Finite-Difference Time-Domain (FDTD)
• - Multi-Resolution Time-Domain (MRTD)
• Frequency-Domain
• - Finite Element Method (FEM)
• - Software HFSS, FEMLAB

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MRTD vs FDTD Formulation
Reference Krumpholz et al, A Field Theoretical
Comparison of FDTD and TLM, IEEE MTT-T, Sept.
1995
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Spatial Sampling Functions
Order-7 Deslauriers-Dubuc Scaling Function
Smooth, Compact, Symmetric scaling functions
Deslauriers-Dubuc Coifman Daubechies Battle-Lemma
rie
High-order Families
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Applications

• Microwave and Optical Circuits
• - RF Circuits and Antenna Design
• Wireless Communications
• - Mobile Communications
• - Indoor Wireless Networks
• - Ultra-Wideband Systems

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Ultra-Wideband Wireless

• Extremely narrow pulse width (less than 1ns)
• Low spectral power density ( Less than noise
  level)
• Low Interference to/from other wireless systems
• High speed multiple users
• High channel capacity

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OUTLINE

• Introduction
• - Numerical Electromagnetics
• Methodologies
• - High-order Time-Domain Techniques (S-MRTD
  v.s. FDTD)
• Applications to Wireless Communications
• - Accurate Signal Fading Predictions
• - Wideband Characteristics and Channel Responses
• - Optimum Signal Transmission and Detection
• Future Work and Conclusions

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Wideband Channel Modeling
Simulated Floor plan

P2






P1



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Channel Responses
S-MRTD-5 3hrs/11min S-MRTD-7.5
11hrs/15min FDTD-20 4 days (92hrs/16min)
Receiving point P1
Receiving point P2
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Error-Time Performance
4 times saving on - CPU time - Cache Memory
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Signal Fading Profile
Sinusoidal steady state
S-MRTD-5
FDTD-10
12 hrs/44min
52 hrs/36min
Conductivity 0.002 S/m Relative Permittivity 3
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Signal Fading Profile
Sinusoidal steady state
FDTD-10
S-MRTD-5
12 hrs/44min
52 hrs/36min
Conductivity 0.05 S/m Relative Permittivity 3
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Signal Attenuation (Fading)
NLOS
LOS
LOS
NLOS
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Power Profile 1
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Power Profile 2
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Wall Attenuation and Guiding Effects
Path Loss Exponent (PLE)
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Fading Statistics - Rayleigh Model
NLOS points
s rms value of the received signal
Cumulative Density Functions
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Conclusions

• Performance Analysis and Applications of S-MRTD
• The application of S-MRTD to Wireless Channel
  Modeling
• Fading and Statistical Properties
• Optimized Signal Transmission and Detection

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Future Work

• Investigation of Antenna Patterns in Smart
  Antenna Applications
• Adaptive Mesh Refinement
• 3D Modeling of Wireless Channels

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Questions/Remarks ?

• Thank you !