Change Location. Digital Modulation Techniques, Second Edition. By author : Fuqin Xiong.
Description Contents Author Reviews This newly revised and expanded edition of an Artech House classic builds on its success as far and away the most comprehensive guide to digital modulation techniques used in communications today. It devotes five new chapters to orthogonal frequency division multiplexing OFDM including its synchronization, performance in fading channels, channel estimation and equalization, peak-to-average power reduction techniques, and non-FFT based OFDM.
Amplitude Shift Keying
The second edition includes new modulations for optical communications and enhanced coverage of M-ary ASK, pulse shaping, and mitigation methods like channel estimate and diversity techniques. It also adds a fast-access comparison of all modulation schemes that will prove indispensable for various research and design tasks. You get full details for every technique including operation principles, bit error probability, spectral characteristic, modulator, demodulator, synchronizer, performance in fading channels, comparison with other techniques, and applications.
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The book makes it easy to find implementation diagrams or data like BER and bandwidth occupied by each scheme for a given data rate, and allows you to confidently formulate modulation schemes and determine which schemes are best for your applications. Almost all schemes and their performance evaluation expressions are backed by derivation or proof, giving you the analytical background needed to improve or modify schemes for specific applications.
What is Modulation?
Nearly illustrations include block diagrams of modulator, demodulator, and synchronizer for most modulation schemes. Plus, new appendixes covering trigonometry identities, Fourier transform pairs and properties, and Q-function and error function values provide even more time-saving assistance for your work.
Introduction Digital Communication Systems. Communication Channels. Basic Modulation Methods. Criteria of Choosing Modulation Schemes. Overview of Digital Modulation Schemes and Comparison.phon-er.com/js/make-ringtones/mp3-player-download-for-android-mobile.php
LiFi: Novel Digital Modulation Techniques for Li-Fi | School of Engineering
Description of Line Codes. Power Spectral Density of Line Codes. Bit Error Rate of Line Codes. Substitution Line Codes.
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Block Line Codes. Pulse Position Modulation. Pulse Interval Modulation. Pulse Width Modulation. Modulation for Optical Transmission. Coherent Demodulation and Error Performance. Noncoherent Demodulation and Error Performance. M-ary FSK. Demodulation Using Discriminator.
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When modulation techniques are used for digital communication, the variations applied to the carrier are restricted according to the discrete information being transmitted. These schemes cause the carrier to assume one of two possible states depending on whether the system must transmit a binary 1 or a binary 0; each discrete carrier state is referred to as a symbol.
This two-bits-per-symbol performance is possible because the carrier variations are not limited to two states. In ASK, for example, the carrier amplitude is either amplitude option A representing a 1 or amplitude option B representing a 0. In QPSK, the carrier varies in terms of phase, not frequency, and there are four possible phase shifts.
Realization of digital modulation techniques using TMS320C6748
We can intuitively determine what these four possible phase shifts should be: First we recall that modulation is only the beginning of the communication process; the receiver needs to be able to extract the original information from the modulated signal. Next, it makes sense to seek maximum separation between the four phase options, so that the receiver has less difficulty distinguishing one state from another.
Note: The phase-shift-to-digital-data correspondence shown above is a logical though arbitrary choice; as long as the transmitter and receiver agree to interpret phase shifts in the same way, different correspondence schemes can be used. The following table should clarify this:. Compared to modulation schemes that transmit one bit per symbol, QPSK is advantageous in terms of bandwidth efficiency.
For example, imagine an analog baseband signal in a BPSK binary phase shift keying system. BPSK uses two possible phase shifts instead of four, and thus it can transmit only one bit per symbol. The baseband signal has a certain frequency, and during each symbol period, one bit can be transmitted. A QPSK system can use a baseband signal of the same frequency, yet it transmits two bits during each symbol period. Thus, its bandwidth efficiency is ideally higher by a factor of two. Load More Articles.