A free powerpoint ppt presentation displayed as a flash slide show on id. We present and experimentally demonstrate a new method to generate optical carrier suppressed differential phase shift keying ocsdpsk modulation format in radio over fiber rof systems. Dpsk modulation,dpsk demodulation,differential phase shift. Optical differential 8level phaseshift keying od8psk. The total phase shift per symbol is the sum of phaserot and the phase generated by the differential modulation. The modulation is accomplished by varying the sine and cosine inputs at a precise time. Performance of differential carrier phase recovery for qpsk. Performance of coherent differential phaseshift keying.
Differential phase shift keying in digital communication. Differential phase shift keying free download as word doc. In differential phase shift keying dpsk the phase of the modulated signal is shifted relative to the previous signal element. A common form of phase modulation that conveys data by changing the phase of the carrier wave. An implementation of optical differential 8level phaseshift keying od8psk is proposed for spectrally efficient high capacity longhaul optical fiber transmission systems. Us20100241918a1 clock and data recovery for differential. The task of the project was to evaluate a differential phase shift keying demodulation technique by. Form of phase shift keying in which the reference phase for a given keying interval is the phase of the signal during the preceding keying interval. Furthermore, a phenomenological relation, which relates the optimum free spectral range to the channel bandwidth, was derived. Differential quadrature phase shift keying listed as dqpsk. In our scheme, a single dualparallel machzehnder modulator dpmzm is used to produce ocsdpsk signal based on amplitude shift keying ask to dpsk format conversion by suppressing the spectral tones.
Pdf differential phaseshiftkeying techniquebased brillouin. The reason is that, compared to conventional onoff keying ook, this format offers 3 db better receiver sensitivity and higher tolerance to. Differential phaseshift keying dpsk differential phase shift keying dpsk is a common form of phase modulation that conveys data by changing the phase of the carrier wave. Phase shift keying psk is a digital modulation scheme based on changing, or modulating, the initial phase of a carrier signal. Differential phase shift keying, fiber optics, delay interferometer, free spectral range 1. Engineering interview questions,mcqs,objective questions,class notes,seminor topics,lab viva pdf free download. The phase of the modulated signal is shifted relative to the previous signal element in differential phase shift keying dpsk. Find out information about differential phase shift keying. Users may download and print one copy of any publication from the public portal for the. Directdetection optical differential 8level phaseshift. It is less susceptible to chromatic dispersion and nonlinear effects. Differential phase shift an overview sciencedirect topics. D8psk abbreviation stands for differential 8phaseshift keying.
As can be seen in figure 2b, the power of four operations is not needed when using the differential carrier phase recovery algorithm. Ppt modulation techniques powerpoint presentation free. Interferometric demodulation and direct detection at the receiver yield three output binary sequences identical to the three input binary sequences. What is the abbreviation for differential 8 phase shift keying. Pdf differential phaseshift keying for high spectral efficiency. Pdf differential phaseshift keying dpsk has attracted significant attentions in research and development during the last several years. Hossein samimi and murat uysal, performance of coherent differential phaseshift keying free space optical communication systems in mdistributed turbulence, j. Pdf differential phaseshift keying for high spectral. Translations in context of keying in englishfrench from reverso context. The dpsk demodulator comprises a coarse frequency and lock detect module for identifying and estimating the frequency of the input signal, a numerically controlled oscillator nco for generating in phase and quadrature signals from the input signal, one pair each.
In dpsk the phase of the carrier changes only on symbol 1, while in bpsk, phase of the carrier get changes both at 1 and at 0. Differential phase shift keying dpsk, a common form of phase modulation conveys data by changing the phase of carrier wave. Differential phase shift keying article about differential. Find out what is the most common shorthand of differential phase shift keying on. Gmsk gaussian minimum shift keying modulation is used in the 420 to 450 mhz band.
What do you mean by differential phase shift keying dpsk. Modulate using mary differential phase shift keying method. Translation find a translation for differential phase shift keying in other languages. Differential phase shift keying dpsk definition, waveform. Generation of optical carrier suppresseddifferential phase. The mdpsk modulator baseband block modulates using the mary differential phase shift keying method. Sep, 2016 the demodulator, which is designed specifically for the symbolset used by the modulator, determines the phase of the received signal and maps it back to the symbol it represents, thus recovering the original data.
Differential phase shift keying dpsk has several benefits over the more ordinary onoffkeying ook modulation format. Phaseshift keying psk is a digital modulation process which conveys data by changing. The mary number parameter, m, is the number of possible output symbols that can immediately follow a given output symbol. In order to maximize performance of undersea systems, and before the adoption of coherent detection, phase shift keying psk and differential detection at the receiver side were introduced commercially around 2007 under the name of differential phase shift keying dpsk or differential binary phase shift keying dbpsk, with b indicating that. This dpsk technique doesnt need a reference oscillator. Here bits for given symbol is determined based on phase change from previous symbol. Partial differential phase shift keying theory and. Us4896336a differential phaseshift keying demodulator.
The licensefree shapedoffset qpsk soqpsk is interoperable with feherpatented qpsk. Pdf effect of doppler shift on differential phaseshift. The task of the project was to evaluate a differential phase shift keying demodulation technique by replacing a mach. This module has been incorporated in yokogawas pntr404, the worlds first rzdqpsk transponder 1. The signal phase follows the high or low state of the previous element. The term psk or phase shift keying is broadly used in a radio communication system. Dpskdifferential phase shift keying transmitter and receiver. In this video, i have explained differential phase shift keying dpsk with following outlines.
Eurasip journal on wireless communications and networking. This kind of technique is mostly compatible with data communications. The vvpe algorithm is compared to the differential carrier phase recovery algorithm in figure 2. Based on the freespace interference of two successive data bits delayed by an unequalarmlength machzehnder interferometer mzi, a pupilmatching timedelay selfhomodyne interference differential phaseshift keying dpsk optical receiver with 2. The vvpe is followed by differential decoding to solve the fourfold phase ambiguity and also to avoid cycle slips. Dpsk modulering for optisk kommunikation med demodulering av fbg forfattare author fredrik jacobsson abstract.
It is one type of phase modulation used to transmit data by altering the carrier waves phase. The dpsk stands for differential phaseshift keying. Chapter 5 signal encoding and modulation techniques 145 when signalencoding techniques are used, a distinction needs to be made between data rate expressed in. Phase rotation of the dpsk modulation, specified in radians as a real scalar. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. An optical dpsk demodulator is a device that provides a method for converting an optical differential phase shift keying dpsk signal to an intensitykeyed signal at the receiving end in fiberoptic communication networks. If you specify phaserot as empty, then dspkdemod uses a phase rotation of 0 degrees. The output is a baseband representation of the modulated signal. Double differential phase shift keying ddpsk is known to be immune to doppler shift, a property that is valuable in. The demodulator utilizes a tunable optical delay based on the combination of wavelength conversion in a photonic crystal fiber and dispersion in a short section of singlemode fiber. Phase shift keying psk is a digital modulation process which conveys data by changing modulating the phase of a constant frequency reference signal the carrier wave. Differential phase shift keying modulation detector radio scribd.
During broadcasting, the inherent non linearity in electronic devices may cause a level dependent phase shift. Phaseshift keying psk is a digital modulation scheme based on changing, or modulating, the initial phase of a carrier signal. Partial differential phase shift keying theory and motivation arxiv. In this, the modulated signals phase is moved e to the element of an earlier signal. Qpsk vs dqpskdifference between qpsk and dqpsk modulations. The input seuence of binary bits is modified such that the next bit depends upon the previous bit. Phase shift keying an overview sciencedirect topics. Dpsk modulation format for optical communication using fbg.
If you specify phaserot as empty, then dspkdemod uses a phase rotation of 0. Generation of optical carrier suppresseddifferential. Mary psk, mary qam, and mary differential phaseshift keying dpsk achieve the transmission of log2m m bits per. Symmetrical differential phase shift keying listed as sdpsk. Form of phaseshift keying in which the reference phase for a given keying interval is the phase of the signal during the preceding keying interval. Differential phase shift keying dpsk is a common form of phase modulation that conveys data by changing the phase of the carrier. A comparative study of higherorder differential phase shift keying. Loyka differential phase shift keying dpsk bpsk need to synchronize the carrier. Dpsk modulation format for optical communication using. Pdf differential phase shift keying dpsk hussam alsherksy.
Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. Dpsk modulation,dpsk demodulation,differential phase shift keying. Partial differential phase shift keying theory and motivation. The author discusses these techniques as they relate to doppler spread, delay spread, rayleigh and rician channel modeling, rake receiver, diversity techniques, mimo and ofdm. This is accomplished by proper design of electrical encoding and optical. Winner of the standing ovation award for best powerpoint templates from presentations magazine. Digital signal processing for wireless communication using.
Dpsk modulator and dpsk demodulator circuits used for dpsk modulationdemodulation respectively are described. Psk is typically applied in wireless local area networks wlan, bluetooth technology and radio frequency identification. Ppt modulation techniques powerpoint presentation free to. The signal phase follows the previous element high or low state. Increasing dispersion tolerance for quaternary optical ask. Differential phase shift keying demodulation matlab. Differential phaseshift keying article about differential. As mentioned for bpsk and qpsk there is an ambiguity of phase if the constellation is rotated by some effect in the communications channel through which the signal passes. All communications toolbox demodulator functions, system objects and blocks can demodulate binary data using either hard decisions or soft decisions. Psk is used to represent digital information, such as binary digits zero 0 and one 1. Looking for the shorthand of differential phase shift keying. Looking for the abbreviation of differential phase shift keying.
Modulate using mary differential phase shift keying. Pdf in this letter, we experimentally demonstrate brillouin echoesbased distributed optical fiber sensing with centimeter spatial resolution. This book examines signal processing techniques used in wireless communication illustrated by using the matlab program. What is the abbreviation for differential 8phaseshift keying. Symmetrical differential phase shift keying how is symmetrical differential phase shift keying abbreviated. Errorfree demodulations for returntozerodpsk signals at both 25 and 40 gbs have been. Tell a friend about us, add a link to this page, or visit the webmasters page for free fun content. Differential phase shift keying dpsk has attracted significant attentions in research and development during the last several years. This page on dpsk differential phase shift keying describes dpsk basics,dpsk modulation and dpsk demodulation with block diagram. Differential phaseshift keying dpsk has attracted significant attentions in research and development during the last several years. Differential quadrature phase shift keying how is differential quadrature phase shift keying abbreviated. Introduction differential phase shift keying dpsk has several benefits over the more ordinary onoff keying ook.
We demonstrate bitrate flexible demodulation of differential phaseshift keying dpsk signals in a linear structure. Find out information about differential phaseshift keying. An overview of dpsk for high spectral efficiency optical. Differential phase shift keying dpsk has several benefits over the more ordinary onoff keying ook modulation format. Oct 17, 2012 differential phase shift keying experiment. Nov 10, 2015 differential phase shift keying dpsk differential phase shift keying dpsk is a common form of phase modulation that conveys data by changing the phase of the carrier wave. Bitrate flexible demodulation of dpsk signals based on. Illustrates signal processing techniques involved in wireless communication discusses multiple access techniques such as frequency division multiple access, time division multiple access, and code division multiple access covers band pass modulation techniques such as binary phase shift keying, differential phase shift keying. It mentions benefits or advantages of dpsk over bpsk. Eindhoven university of technology master dpsk modulation. In our scheme, a single dualparallel machzehnder modulator dpmzm is used to produce ocsdpsk signal based on amplitude shift keying ask to dpsk format conversion by suppressing the spectral tones of. D8psk abbreviation stands for differential 8 phase shift keying. Jan 14, 2014 introduction optispice tanner plugin was created by optiwave and mentor graphics to enhance tanner tspice with optical circuit simulation capabilities. Dual pin photodiode for phase shift keying optical.
It allows information in a more efficient way to be carried over a radio communications signal compare with other modulation forms. Dqpskdifferential quadrature phase shift keying fig. What is the abbreviation for differential phase shift keying. We experimentally demonstrate a highspeed differential phase shift keying dpsk modulation using a silicon pushpull operated dualdrive mach zehnder modulator mzm based on carrier depletion. Weve got 2 shorthands for differential phase shift keying what is the abbreviation for differential phase shift keying. It does not need a coherent carrier at the demodulator. To achieve longhaul transmission systems using differential phase shift keying dpsk or dqpsk technologies, we have developed a dual pin photodiode module which can be used in the frontend circuit in such phase shift keying formats. Differential phaseshift keying dpsk has recently attracted a great deal of attention especially for highspeed, longhaul transmission systems. In digital modulation, digital data can be represented by using a fixed number of discrete signals. Generally, it is used for wireless communication of lans, bluetooth, and rfid. Performance of differential carrier phase recovery for. A digital modem is provided for demodulation of differential phaseshift keyed dpsk signals in a land mobile satellite receiver.
We present and experimentally demonstrate a new method to generate optical carrier suppresseddifferential phaseshift keying ocsdpsk modulation format in radio over fiber rof systems. Dpsk modulation format for optical communication using fbg demodulator titel. The digital modulation like psk phase shift keying is one kind of modulation which is used to change the phase of the carrier signal to convey the data. The dpsk demodulator comprises a coarse frequency and lock detect module for identifying and estimating the frequency of the input signal, a numerically controlled oscillator nco for generating inphase and quadrature signals from the input signal, one pair each. The impact of the number of bits processed by the coordinate rotational digital computer cordic algorithm for the differential carrier phase recovery is also investigated. Below is the diagram for the model waveform of dpsk. Differential phase distortion dp or dp is the shift of color signal phase with respect to the colorburst phase. Dpsk modulation has already been successfully applied in high data rate optical fiber communications and has recently gained significant research attention. Symmetrical differential phase shift keying how is. The webs largest and most authoritative acronyms and abbreviations resource. An optical dpsk demodulator is a device that provides a method for converting an optical differential phaseshift keying dpsk signal to an intensitykeyed signal at the receiving end in fiberoptic communication networks.