Wireless Channel

1. Introduction
The increasing demand for cellular services offers a high challenge on the design of the cellular system. To be able to design a good cellular system and fine tune intricate parameters demands a good design tool. In the meantime, accurate propagation prediction tool is vital to the success of designing a cellular system, especially in the early stages of cellular and PCS cell design. The propagation channel varies in time, frequency, and with spatial displacement. Because even in the static case, where the transmitter and receiver are fixed, the channel can be dynamic since scatterers and reflectors are likely to be in motion. The term multipath arises from the fact that, through reflection, diffraction , and scattering, radio wave can travel from a transmitter to a receiver by many paths

1. Introduction

2. Channel model

2.1. Lee model
2.1.1. outdoor model
2.1.2. The Philosophy of Forming Lee' Model
2.1.2.1 Caused by the human-made structures only
2.1.2.2 Adding the cause of terrain contour
2.1.3. A Normal-cell Model
2.1.4. Microcell Model

2.2. Ray Tracing
2.2.1. Indoor channel
2.2.2. Physical phenomena involved
2.2.3. General equation
2.2.3.1 Reflection
2.2.3.2 The transmission
2.2.3.3 The diffraction
2.2.3.4 The diffusion on a surface
2.2.3.5 The divergence
2.2.4. Ray tracing model in a forested environment
2.2.5. Building Definition

2.3.JTC
(Joint Technical Committee)
2.3.1. History
2.3.2. wide band multipath propagation models
2.3.3. Physical Environments
2.3.4. General Channel Model
2.3.5. Doppler Spectrum
2.3.6. The Wide band Tapped Delay-Line Model
2.3.6.1 Indoor
2.3.6.2 Outdoor-Low antenna
2.3.6.3 Outdoor-High Antenna
2.3.7. Implementation
2.3.7.1 Simulation Block Diagram
2.3.7.2 Simulation Algorithm and Result

3. Trend and issues on channel model

4. References

(1) Greg Evans, Bob Joslin, Lin Vinson, Bill Foose " The optimization and application of the W.C.Y. Lee propation model in the 1900 MHz frquency band" . Tec Cellular, Inc.
(2) G.A.Arredondo, W.H.Chriss, "A multipath fading simulator for mobile radio", IEEE trans, on V.T.,vol.VT-22, NO.4, pp.241-244, Nov.1973
(3) S. Gurunathan, K.Feher,"multipath simulation models for mobile radio channel", Proceeding of the 1993 IEEE V.T. society, vol.1 of 2, pp.131-134,1993
(4) W.C.Y.Lee "Lee's model" PacTel Corporaation Walnut Creek,CA
(5) H.Hashemi,"The indoor radio propagation channel,"Proc.IEEE, vol.81,pp.943-968,
July 1993
(6) T.Aulin,"A Modified Model for fading signal at a mobile radio channel." IEEE Trans. Veh. Technol.,vol.VT-28, No.3,pp.182-203,August 1979