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2012 | Buch

Introduction to Radiowaves Kapitel lesen Erstes Kapitel lesen

Propagation Engineering in Wireless Communications

verfasst von: Abdollah Ghasemi, Ali Abedi, Farshid Ghasemi

Verlag: Springer New York

Enthalten in: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik" , Springer Professional "Wirtschaft"

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Über dieses Buch

Propagation Engineering in Wireless Communications covers the basic principles needed for understanding of radiowaves propagation for common frequency bands used

in radio-communications. This book includes descriptions of new achievements and new developements in propagation models for wireless communication. The book is intended to bridge the gap between the theoretical calculations and approaches to the applied procedures needed for radio links design in a proper manner. The authors intention is to emphasize propagation engineering by giving sufficient fundamental information and then going on to explain the use of basic principles together with technical achievements in this field.

Inhaltsverzeichnis

Frontmatter
Chapter 1. Introduction to Radiowaves
Abstract
In 1865, James Clerk Maxwell introduced the notion of electromagnetic (EM) waves propagating with constant speed in homogenous media, based on relations between varying electric and magnetic fields. The speed of EM waves in free space corresponds to the speed of light and is equal to 3 ×108 m/s. Several years later, a German scientist named Hertz found out that radiowaves have a nature similar to EM waves but they are invisible.
Abdollah Ghasemi, Ali Abedi, Farshid Ghasemi
Chapter 2. Basic Principles in Radiowave Propagation
Abstract
This chapter is dedicated to basic principles commonly used in radiowaves propagation and will be frequently referred to in succeeding chapters. Due to the variety of topics to be discussed, only brief and general descriptions and formulas are given. The details can be found in more specialized references.
Abdollah Ghasemi, Ali Abedi, Farshid Ghasemi
Chapter 3. Radiowave Propagation in Troposphere
Abstract
Most of the radio transmissions are carried out in the lower layers of the Earth atmosphere and in fact in the troposphere. Some of the radio systems in point-to-point, point-to-multipoint, and point- to- area types include line of sight radio links in UHF, SHF, and EHF bands, mobile radio networks in VHF and UHF bands, and TV and FM audio broadcasting. Due to the vast usage of these communication systems, the study of troposphere layer and its impacts on wave propagation is extremely important to radio experts and scientists.
Abdollah Ghasemi, Ali Abedi, Farshid Ghasemi
Chapter 4. Radiowave Propagation in Ionosphere
Abstract
In Chap.3, the fundamental phenomena of troposphere were investigated and their effects on radiowaves propagation were explained. This chapter is dedicated to study the main phenomena of radiowave propagation in the ionosphere. As shown in Fig.4.1, this layer basically starts from the height of 50 km above the Earth and extends up to the height of 600 km. Although, in some references it is addressed up to the height of 1,000km, but the main effects of these phenomena appear at heights up to 600 km.
Abdollah Ghasemi, Ali Abedi, Farshid Ghasemi
Chapter 5. Propagation in 3KHz to 30MHz Band
Abstract
In the pervious chapters, we considered the general concepts of radiowave propagation, especially in troposphere and ionosphere. This chapter is dedicated to study the wave propagation in 3 KHz to 30 MHz frequency range, which is classified by ITU as VLF, LF, MF, and HF frequency bands.
Abdollah Ghasemi, Ali Abedi, Farshid Ghasemi
Chapter 6. Terrestrial Mobile Radio Propagation
Abstract
The basic principles regarding radiowaves propagation in the mobile radio systems and effects of different phenomena, and parameters on these waves are outlined in this chapter. The issues provided are helpful in design and application of this kind of radiowaves. Frequency bands from LF up to UHF and even a certain part of SHF band are used in several types of mobile radio systems such as land, maritime, aeronautical, and satellite networks.
Abdollah Ghasemi, Ali Abedi, Farshid Ghasemi
Chapter 7. Line of Sight Propagation
Abstract
In line of sight (LOS) radio communications, the main route is the direct path between the transmitter and the receiver considering the curvature of radiowave trajectory. In Chap. 2, we discussed the general phenomena such as free space loss (FSL) , gas and vapor loss, Fresnel radius, K-factor, and other mechanisms such as diffraction, reflection, and refraction. In this chapter we will introduce specific issues related to the LOS wave propagation.
Abdollah Ghasemi, Ali Abedi, Farshid Ghasemi
Chapter 8. Selected Topics in Radiowave Propagation
Abstract
Ever increasing demands for line of sight (LOS) radiocommunications in UHF, SHF, and EHF frequency bands and future potential needs resulted in employing higher frequency bands. To meet future requirements terahertz band has been an objective issue for ITU and radio research centers.
Abdollah Ghasemi, Ali Abedi, Farshid Ghasemi
Backmatter
Metadaten
Titel
Propagation Engineering in Wireless Communications
verfasst von
Abdollah Ghasemi
Ali Abedi
Farshid Ghasemi
Copyright-Jahr
2012
Verlag
Springer New York
Electronic ISBN
978-1-4614-1077-5
Print ISBN
978-1-4614-1076-8
DOI
https://doi.org/10.1007/978-1-4614-1077-5

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