By Masoud Salehi John G. Proakis
For a one/two-semester senior or first-year graduate point direction in analog and electronic communications. this article can be an appropriate reference for electric engineers for all easy correct themes in electronic verbal exchange approach layout.
With an emphasis on electronic communications, Communication platforms Engineering, introduces the elemental ideas underlying the research and layout of conversation structures. additionally, this article supplies an effective advent to analog communications and a overview of significant mathematical beginning topics.
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Additional info for Fundamentals of Communication Systems
The physical channel may be a pair of wires that carry the electrical signal, or an optical fiber that carries the information on a modulated light beam, or an underwater ocean channel in which the information is trans mitted acoustically, or free space over which the information-bearing signal is radiated by use of an antenna. Other media that can be characterized as communication channels are data storage media, such as magnetic tape, magnetic disks, and optical disks. One common problem in signal transmission through any channel is additive noise.
This type of noise is usually called thermal noise. Other sources of noise and interference may arise externally to the system, such as interference from other users of the channel. When such noise and interference occupy the same frequency band as the desired signal, the effect can be minimized by proper design of the transmitted signal and the demodulator at the receiver. Other types of signal degradation may be encountered in transmission over the channel, such as signal attenuation, amplitude and phase distortion, and multipath distmtion.
6 Illustration of sky-wave propagation. lower layers of the ionosphere drops sharply and the frequency absorption that occurs during the day is significantly reduced. As a consequence, powerful AM radio broadcast stations can propagate over large distances via sky wave over the F-layer of the ionosphere, which ranges from 90 miles to 250 miles above the surface of the earth. A common problem with electromagnetic wave propagation via sky wave in the high frequency (HF) range is signal multipath.
Fundamentals of Communication Systems by Masoud Salehi John G. Proakis