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2010 | Buch

Preview and Introduction Kapitel lesen Erstes Kapitel lesen

Digital Communication

Principles and System Modelling

verfasst von: Apurba Das

Verlag: Springer Berlin Heidelberg

Buchreihe : Signals and Communication Technology

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

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SUCHEN

Über dieses Buch

"Digital Communications" presents the theory and application of the philosophy of Digital Communication systems in a unique but lucid form. The book inserts equal importance to the theory and application aspect of the subject whereby the authors selected a wide class of problems.

The Salient features of the book are:

1. The foundation of Fourier series, Transform and wavelets are introduces in a unique way but in lucid language.

2. The application area is rich and resemblance to the present trend of research, as we are attached with those areas professionally.

3. Elegant exercise section is designed in such a way that, the readers can get the flavor of the subject and get attracted towards the future scopes of the subject.

4. Unparallel tabular, flow chart based and pictorial methodology description will be there for sustained impression of the proposed design/algorithms in mind.

Inhaltsverzeichnis

Frontmatter
Chapter 1. Preview and Introduction
Abstract
From the age of primitive science, when definition of science was not known as ‘special knowledge’, communication is essential. When animals felt the urge of expressing something to their neighbor, they started communicating. Human is also a social animal. A man alone is nothing but a small island surrounded by a large ocean. By virtue of the intellect, human being must have much stronger expressions and feelings of mind than that of the other animals. In the present chapter, process of communication is described briefly in respect of distance between the communicating nodes or subjects, and also in respect of direction of communication. By which physical quantity we communicate information is discussed then and called a signal. Next, long distance communication, i.e. telecommunication is broadly divided with respect of signal used for communication as analog and digital communication. At the rear end of the chapter, the important elements of digital communication are depicted using blocks.
Apurba Das
Chapter 2. Waveform Encoding
Abstract
The first step of accepting the data into the digital communication system is constrained by its property to be ‘digital’. Waveform coding signifies essentially the digital conversion of the naturally system fed signal i.e., analog signal. According to the system designer and user requirement, the encoding or conversion can be done using different ways keeping the noise bandwidth trade-off of the system design. Uniform, non-uniform, single bit (delta modulation), self tuned (ADM and DPCM), and efficient hardware (Delta-sigma modulation) quantizations are in discussion as the inevitable step of waveform encoding.
Apurba Das
Chapter 3. Digital Baseband Signal Receivers
Abstract
In this chapter, the problems and solutions of reception of noise contaminated baseband signal are discussed. Improvement of SNR by using integrate and dump filter is also discussed. It is shown, how a chance of signal reception is ensured even with huge noise accumulation. Next, the properties and operations of generalized optimum filter (minimum probability of error), matched filter and correlator are discussed. A comparison between the operation of correlator and that of matched filter is also presented.
Apurba Das
Chapter 4. Digital Baseband Signal Transmitter
Abstract
In this chapter the issues regarding proper formatting of raw/baseband (without any modulation) transmitted signaling bits are the main topic of discussion. The necessary components of the design of digital baseband signal transmitter are discussed. Spectral and timing response characteristics for different formats are compared. Finally, at the end of this chapter one can understand the procedure through which one can encode a signal which is transmittable through a band-limited channel so that the symbols can be received and reconstructed un-erroneously.
Apurba Das
Chapter 5. Equalization
Abstract
Equalizer is the inverse filter to nullify the effect of Inter-Symbol Interference (ISI), due to dispersive nature of the transmission channel. In the present chapter, the concept, reason and effect of ISI is discussed in the primary sections. Next, the ideal (rect shape) and practical filter response (raised cosine shape), i.e., the impulse response is discussed. The procedure of inverse filtering, i.e., process of equalization comes next. The criterion and variations of linear and adaptive equalizers are discussed. The automatic design parameter (tap gain) adjustment is depicted for time varying practical systems.
Apurba Das
Chapter 6. Digital Modulation Techniques
Abstract
For ease of analog or digital information transmission and reception, modulation is the foremost important technique. In the present chapter, we’ll discuss about different modulation scheme in digital mode done by operating a switch/ key by the digital data. As we know, by modifying basic three parameters of the carrier signal, three basic modulation schemes can be obtained; generation and detection of these three modulations are discussed and compared with respect to probability of error or bit error rate (BER).
Apurba Das
Chapter 7. Spread Spectrum Modulation
Abstract
Spread Spectrum modulation is interesting and important in terms of security, in terms of bandwidth utilization and in terms of distortion (or noise) avoidance. In the present chapter, the scheme of spread spectrum modulation is discussed in detail. The concept of Pseudo Random Noise, justification of its name and generation of PN sequence is discussed after pointing out its importance in the scheme of spread spectrum. Two most important classes of spread spectrum, namely direct sequence and Frequency hopping is discussed. Next, GPS is pointed out briefly as an application of DSSS. Finally, the principle of operation of Code Division Multiple Access (CDMA) is described briefly.
Apurba Das
Chapter 8. Information Theory
Abstract
The theory of information was 1st matured by C.E. Shanon in view of the amount or number of bits a channel can allow. In the present chapter the definition and measure of information is presented 1st. Next average information per source, i.e. entropy is presented. Mutual information is proved to be more important in terms of communication than absolute information. Classification of information generating sources and information carrying channels are then discussed. Some issues regarding probability of detection of erroneous bit at the receiver are determined. At the rear end of this chapter the efficient coding scheme or entropy coding is introduced with proper example and illustrations.
Apurba Das
Chapter 9. Error Control Coding
Abstract
In digital communication the process of coding is employed for the reason of error avoidance. The two stages of error avoidance are error detection and correction. First, the scope of coding is discussed. The philosophy behind the technique of coding is discussed with the help of code sphere. Next, different types of coding techniques are discussed with proper mathematical support and explanation. For most of the cases the design procedures are also discussed.
Apurba Das
Backmatter
Metadaten
Titel
Digital Communication
verfasst von
Apurba Das
Copyright-Jahr
2010
Verlag
Springer Berlin Heidelberg
Electronic ISBN
978-3-642-12743-4
Print ISBN
978-3-642-12742-7
DOI
https://doi.org/10.1007/978-3-642-12743-4

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