CSE5345_Lecture3

CSE5345_Lecture3 - 1 CSE 5345 Fundamentals of Wireless...

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Unformatted text preview: 1 CSE 5345 Fundamentals of Wireless Networks Yonghe Liu Yonghe@cse.uta.edu 1/24/12 Schedule Quiz 1: around week 4 Lab 1: week 8 due Lab 2: week 11 due Exam: week 12 Project: week before final exam (Presentation/Demo) 5/4 last day of class Last Class Transmission Fundamentals Important Concepts Frequency domain expression Channel Capacity Frequency-Domain Concepts Bandwidth of the signal? 2 Shannon Capacity Formula Equation: Represents theoretical, error-free maximum that can be achieved In practice, only much lower rates achieved Formula assumes white noise (thermal noise) Impulse noise is not accounted for Attenuation distortion or delay distortion not accounted for SNR 1 log 2 B C Today Finish remaining part of Part I CH 5: Antennas and propagation Please read other chapters of Part I Classifications of Transmission Media Transmission Medium Physical path between transmitter and receiver Guided Media Waves are guided along a solid medium E.g., copper twisted pair, copper coaxial cable, optical fiber Unguided Media Provides means of transmission but does not guide electromagnetic signals Usually referred to as wireless transmission E.g., atmosphere, outer space Unguided Media Transmission and reception are achieved by means of an antenna Configurations for wireless transmission Directional Omnidirectional 3 General Frequency Ranges Microwave frequency range 1 GHz to 40 GHz Directional beams possible Suitable for point-to-point transmission Used for satellite communications Radio frequency range 30 MHz to 1 GHz Suitable for omnidirectional applications Infrared frequency range Roughly, 3x10 11 to 2x10 14 Hz Useful in local point-to-point multipoint applications within confined areas Terrestrial Microwave Description of common microwave antenna Parabolic "dish", 3 m in diameter Fixed rigidly and focuses a narrow beam Achieves line-of-sight transmission to receiving antenna Located at substantial heights above ground level...
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CSE5345_Lecture3 - 1 CSE 5345 Fundamentals of Wireless...

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