[英语论文] 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
(7) Michel Lecours,Francois Marceau,"Design And Implementation of a Channel Simulator for Wideband Mobile Radio Transmission" Electrical Engineering Department Laval University Quevec. Canada GIK 7P4
(8)M. Lecours,J.Y.Chouinard,G.Y.Delisle,J.Roy,"Statistical modeling of a mobile radio channel",IEEE 1968 V도.Technol.donf.May 1986,Dallas,Texas,pp.232-238
(9) R.A.Goubran,,member,IEEE, H.M.Hafez, and A.U.H.Sheikh,Senior Member,IEEE "Implementation of a Real-Time Mobile Channel Simulator Using A DSP Chip"
(4')E.Casas, C, Leung, "A simple digital fading simulator for mobile radio "; IEEE trans. on V.T.,Vol.VT-39, No.3,pp.205-212, Aug.1990
(10) PERRAULT Olivier, ROSSI Jean-Prerre, BALANDIER Thierry Centre Vational d'Etudes des Telecommunications " predicting field strength with a neunal ray-tracing model"
(11) Beckmann,P. and Spizzichino, A. "The scattering of electromagnetic waves from rough surfaces", MacMillan,1963,pp.1-33,70-98
(12) Born,M,and Wolf,E.principles of optics, Pergamin Press
(13) Levy,A.,Et.canal de prop. radio avec les mobiles: measure, modelisation, et impact sur la qualite des comm. numeriques, Habilit., Univ. Versailles-St-Quentin,
Jam.1994
(14) Levy,J.P. and Levy,A.J., "A ray model for decimetric radio wave porpagation in an urban area, radio science, 27(6) pp.971-979, Nov-Dec 1992
(15) Levy,J.P., Big, J.C., and Levy, A.J., "ray launching method for radio mobile propagation in an urban area", IEEE Ant. and Prop. Symposium,3,1540-1543,1991
(16) Xia. H.H. and Bertoni, H.L. Diffraction of cylindrical and plane waves by an
array of absorbing half-screens, IEEE Trans. Antennas Orioag., 40(2),1992, pp.170-177
(17)Keller.J.B., Geometric the..