Man has been trying to communicate with each other since pre-historic days. The first form of communication was, perhaps, facial expressions. It was superseded by speech communication and then written communication. Some other forms of communication like fire, smoke, drum beating and reflection of light by mirror were also used for centuries. But these means of communication were limited.
The 19th century was a revolutionary century in communication history. There was great change in communication system since early telegraphy by Gauss, Weber and Wheatstone. By the end of 19th century the man was able to send and receive messages without using any wires (Now a term known as wireless technology) but it just consisted of transmission and receiving of Codes.
The 20th century saw a great revolution in this field. Several new techniques were discovered. Two way communications started. Now the man was not only able to send and receive voice signals but also video signals.
With the invention of transistor in 1948, the communication technology took a new turn. All the vacuum tube electronics was shifted towards the solid state devices. The speed of operation and life of instruments were increased greatly.
During the last part of 20th century not only long distance voice and video transmission was started but also the inter-planet communication was possible. Computers and mobile phone became common.
The 21st century is seemed to be the climax of the field. No body can survive without communication. It has become the part of daily life.
It is now even more necessary to keep in touch with each other, both in the War and Peace.
Communication system by A. Bruce Carlson & Paul B. Chilly provides the introduction to communication and introduce the mathematical models of several systems for advanced under graduates and first-year-graduate student in electrical, electronics and computer engineering. This text introduces Analog Communication, random signals and noise, digital systems and information. This text assumed that the reader is already familiar with differential equations, steady-state and transient circuit analysis and a first course in electronics. More-ever a familiarity with operational amplifiers, digital logic and matrix notation is needed. Some topics can be skip and return back when ever comfortable, a helpful feature of the book.
This text can be divided into six sections. These include:
1. First new introductory chapter.
2. Next two chapters dealing with basic tools.
3. Next four chapters implementing these tools.
4. The following three chapters covering Probability, random signals and noise.
5. The last six chapters are reserved for digital communication and information theory, which require some knowledge of random signals and include coded pulse modulation.
6. An index, References, Tables, supplementary reading, Answers to selected Problems and solutions to Exercises
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