File Name: modulation and demodulation in communication system .zip
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In this chapter we introduce chaos-based digital communications. Our discussion begins with the conventional digital communication systems. We first review the basic operation of digital modulation, which is to represent digital symbols by periodic basis signals. In this chapter we present a summary of the recent development in this field and review a few most widely studied chaos-based digital modulation schemes. Unable to display preview. Download preview PDF.
Year of fee payment : 4. Year of fee payment : 8. Effective date : A communication system including a light modulator system includes a laser that produces a high frequency carrier wave signal and a laser information signal source that produces a much lower frequency information signal. The carrier wave signal passes through a first pinhole in a screen to a light mixer cavity. The information signal passes through a second pinhole in the screen to the light mixer cavity, the signals being mixed in the light mixer cavity after passing through their respective pinholes. The resulting signal components include a sum of the carrier wave signal and the information wave signal.
We start with the simple baseband binary communication system over the AWGN channel to in- troduce the concept of a matched £lter. In many cases, we have to.
Demodulation is extracting the original information-bearing signal from a carrier wave. A demodulator is an electronic circuit or computer program in a software-defined radio that is used to recover the information content from the modulated carrier wave. The signal output from a demodulator may represent sound an analog audio signal , images an analog video signal or binary data a digital signal.
Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. Use of this web site signifies your agreement to the terms and conditions. Pulse width modulation and demodulation scheme in long-distance scattering optical communication Abstract: In order to satisfy the source demand of long-distance scattering optical communication system, pulse width modulation scheme is proposed, which aim at the characteristics of high power laser. A wireless optical communication experiment system is built and the pulse width which generated by the same drive electric is tested.
The word pulse in the term pulse-code modulation refers to the "pulses" to be found in the transmission line. This perhaps is a natural consequence of this technique having evolved alongside two analog methods, pulse width modulation and pulse position modulation , in which the information to be encoded is represented by discrete signal pulses The BPSK Demodulator Baseband block demodulates a signal that was modulated using the binary phase shift keying method. The input is a baseband representation of the modulated signal. With LLR demodulation, one can use the Viterbi decoder either in the unquantized decoding mode or the soft-decision decoding mode. This book uses a practical approach in the application of theoretical concepts to digital communications in the design of software defined radio modems. This book discusses the design, implementation and performance verification of waveforms and algorithms appropriate for digital data modulation and demodulation
The reconfigurability in Cognitive Radio CR facilitates to dynamically change its parameters for the efficient spectrum utilization. The motivation behind the study of cognitive radio is that the number of different radio signals can be handled without using extra circuitry, i. SDR allows service providers to upgrade infrastructure without unreasonable cost. Implementation of various analog and digital modulation techniques using the GNU Radio provides a way for developing advanced wireless communication system. GNU Radio software is a highly flexible signal processing platform, which makes it easy and reduces time to implement different modulation techniques with appropriate script.
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The ability to 'up convert' baseband signals has implications on aerial dimensions and design, long distance terrestrial communications, space communications.Reply
tenable to directly transmit baseband signals over communication links. have been allocated by the U.S. Federal Communications Commis-.Reply