PERFORMANCE ANALYSIS OF DIGITAL COMMUNICATION SYSTEM USING .

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International Journal Of Electrical, Electronics And Data Communication, ISSN: 2320-2084Volume-4, Issue-5, May.-2016PERFORMANCE ANALYSIS OF DIGITAL COMMUNICATIONSYSTEM USING MATLAB AND VERILOG HDL1SURJEET SINGH KANAWAT, 2ANURAG SINGH1,2Electronics and Communication Engineering Department SRM University, Delhi NCR Campus, IndiaE-mail: 1surjeetkanawat@gmail.com , 2agill56@gmail.comAbstract- Matlab executions of binary amplitude shift keying (BASK), binary frequency shift keying (BFSK), and binaryphase shift keying (BPSK) advanced modulators are displayed. The base number of squares important for accomplishingBASK, BFSK, and BPSK tweak, and for full mix with Matlab and HDL lessens BER (Bit Error Ratio). The data bearersignal and the bit stream (balancing sign) are client controllable. These advanced modulators were produced and aggregatedto a Verilog Hardware Description Language (HDL) netlist, and were later actualized into an Isim. The usefulness of thesecomputerized modulators was shown through reenactments utilizing the Isim and Modelsim (Vsim), and exploratoryestimations of the continuous adjusted sign by means of a Matlab.Keywords- BASK; BFSK; BPSK; binary; digital modulator; amplitude shift keying; frequency shift keying; phase shiftkeying; OFDM Communication System.Distinctive change methods, for example, DiscreteFourier change (DFT) and its reverse (IDFT), discreteHartley change (DHT) and its converse (IDHT),Discrete Cosine Transform and its backwards (IDCT)are utilized to perform the tweak and demodulationoperations in the usage of OFDM and thought abouttheir execution by discovering their Bit Error rate forvarious estimations of SNR.I. INTRODUCTIONIn a solitary bearer correspondence framework, theimage period must be much more prominent than thedeferral time with a specific end goal to maintain astrategic distance from between image impedance(ISI) [1]. Since information rate is converselycorresponding to image period, having long imageperiods implies low information rate andcorrespondencewastefulness.A multicarrierframework, for example, FDM, partitions theaggregate accessible transfer speed in the range intosub-groups for numerous bearers to transmit inparallel [2]. A general high information rate can beaccomplished by putting bearers intently in the range.II. DIGITAL MODULATIONS TECHNIQUESIn digital modulation techniques, a simple bearer signis adjusted by a twofold code. The advancedmodulator gadget acts an interface between thetransmitter and the channel. The advanced regulationplans can be arranged fundamentally either on thepremise of their identification attributes or as far astheir data transfer capacity compaction qualities. Theessential criteria for best balance plan relies on uponBit Error Rate (BER), Signal to Noise Ratio (SNR),Available Bandwidth, Power proficiency, betterQuality of Service, cost adequacy [8]. The executionof every regulation plan is measured by evaluating itslikelihood of blunder with a suspicion that frameworkare working with Additive White Gaussian Noise [9].Adjustment techniques which are fit for transmittingmore bits per image are more safe to mistake createdby clamor and obstruction impelled in the channel[10]. The deferral mutilation can be a critical measurewhile choosing balance plan for advanced radio [11].In any case, between transporter obstruction (ICI)will happen because of absence of dispersing toindependent the bearers. To evade between conveyorchecks, screen gatherings ought to be placed amidstany abutting transporters, which results in cut downdata rate.The objective of these suspects is to show the thoughtand reasonableness of an OFDM system, andinvestigate how its execution is changed byfluctuating some of its genuine parameters. Thisobjective is gotten by building together a MATLABundertaking to recreate a vital OFDM structure. Fromthe procedure of this advancement, the component ofan OFDM framework can be contemplated; and witha finished MATLAB program, the attributes of anOFDM framework can be investigated.2.1 BASK ModulationIn a BASK (twofold abundancy shift scratching)balance handle, the adequacy of the sinusoidaltransporter sign is changed by message level ("0" or"1"), while keeping the recurrence and stageconsistent. A piece outline of the BASK balance andits sign waveforms are appeared in Figures 1 and 2,individually. Since there are sharp discontinuities atthe move focuses, the subsequent BASK signal has apointlessly wide data transfer capacity. The bandpassUtilizing MATLAB, reproduction of OFDM wasfinished with various regulation methods utilizingdiverse change procedures. The advanced adjustmentplans, for example, BPSK and QPSK were chosen toevaluate the execution of the planned OFDMframework by discovering their Bit Error rate forvarious estimations of SNR.Performance Analysis Of Digital Communication System Using Matlab And Verilog HDL1

International Journal Of Electrical, Electronics And Data Communication, ISSN: 2320-2084Volume-4, Issue-5, May.-2016channel will expel the high-recurrence segments ofthe BASK signal. The yield is a band restricted sign,prepared for transmission by a force speaker.A BFSK signal is given as:A BASK signal is given as:Where m (t) 0 or m (t) 1 (the twofold message), Tis the bit length, and A, fc, and Φ0 are theplentifulness, recurrence, and period of the sinusoidaltransporter signal. The regulated sign has a force P A2/2.S( ) (t) m(t)A sin(2πf t Φ ) , 0 t TWhere m (t) 0 or 1 (the double message), T is thebit term, and A, fc, and Φ0 are the sufficiency,recurrence, and period of the sinusoidal bearer signal.The regulated sign has a force P A2/4.sin {2 [ ( )] Φ }2.3 BPSK MODULATIONIn a BPSK (twofold stage shift scratching) regulationprocess, the period of the sinusoidal bearer sign ischanged by message level ("0" or "1") while keepingthe adequacy and recurrence consistent. A piecegraph of the BPSK tweak and its sign waveforms areappeared in Figures 5 and 6, separately.Sinusoidal CarrierA BPSK signal is given as:( ) sin[2 ( ) ], 0 Where m (t) 0 or 1 (the paired message), T is the bitlength, and A, fc, and Φ0 are the abundancy,recurrence, and period of the sinusoidal transportersignal. The regulated sign has a force P A2/2.Fig 1: BASK Modulation Block Diagram.Fig 2: The BASK signal waveforms.2.2 BFSK MODULATIONIn a BFSK (twofold recurrence shift scratching)tweak handle, the recurrence of the sinusoidal bearersign is changed by message level ("0" or "1") whilekeeping the sufficiency and stage consistent. A squarechart of the BFSK adjustment and its sign waveformsare appeared in Figures 3 and 4, individually.Fig 5: Block Diagram of BPSK ModulationFig 6: The BPSK signal waveforms.III. METHODOLOGYFig 3: Block Diagram of BFSK ModulationFig 4: The BFSK signal waveforms.Fig 7: OFDM Block DiagramPerformance Analysis Of Digital Communication System Using Matlab And Verilog HDL2

International Journal Of Electrical, Electronics And Data Communication, ISSN: 2320-2084Figure 7 demonstrates the essential square graph ofOFDM transmitter and collector utilized forreenactment. OFDM is produced by picking the rangerequired, taking into account the information, andbalance plan utilized. Every transporter to be createdis allocated information to be transmitted. Therequired adequacy and period of the transporter isthen computed in view of the tweak plan (ordinarilyBPSK, QPSK, or QAM). For instance, on the offchance that we need to transmit approaching 8 bitcomputerized information, we need to pick 8 diversebearer signals, which are orthogonal to each other.Every bearer is alloted to an alternate piece and itsabundancy and stage are picked by plan utilized. Therequired range is then changed over back to its timespace signal utilizing an Inverse Fourier Transform.Volume-4, Issue-5, May.-20161. Sampling frequency,2. Two different frequencies for modulation.Implementaion is done on MATLAB R2013a versionand later on the results are also cross complied andlinked with Model Sim.CASE 1: WITH MATLAB.When MATLAB has been used BFSK modulation ismeasured for time interval of 0.01 seconds and for apulse duty cycle of 50 %.IV. PROPOSED WORKAn analysis is done with respect to three basicmodulation schemes implemented in digitalmodulation systems. The complete system is anexample system of two different techniques namelyOFDM system and Modelsim based OFDM system.When two communication models are taken thenimplementation of OFDM in SIMULINK and whatresults came will compare with OFDM system inSIMULINK if one block is replaced. For comparisonthese steps should be done. First all digital modulation techniques weredesigned by using Matlab and run in Matlabwith their HDL codes and compare. Run there HDL codes in Xilinx (Isim) andModelsim (Vsim) and compare theirwaveforms. Now, check there visibility, feasibility oftheir HDL codes. Now by using these techniques design anOFDM Communication network. Than one block is replaced from the originalblock diagram of OFDM and compare theirresults from original one.Fig 8: BFSK Waveform using MatlabCASE 2: WITH MATLAB AND MODELSIM.This figure 9 suggests a change of scenario andwaveform as well. This is the platform of modelsimwhere binary compiled results are found usingMATLAB and Modelism, different waveforms in thisfigure are indicating signal transfer betweenMATLAB to modelsim.V. SIMULATION AND RESULTSThis examination paper is a work of computerizedcorrespondence. Here separately every regulationplan has been implemeneted. There are threeunmistakable change plots that are essential forcorrespondence in cutting edge environement,specifically, Binary stage shift keying, quadric stageshift keying and quadric adequacy regulationarrangements.This paper takes a shot at just twofold stage shiftkeying, paired plentifulness shift keying and doublerecurrence shift keying.Fig 9: BFSK Waveform using ModelsimCASE 3: WITH XILINX.Here in figure 10 Model Sim is replaced with XilinxISIM tool for results validation, a similar result canbe evaluated for two different BFSK modulations.I. BFSK MODULATIONBFSK modulation has been implemented in matlabby considering two specific parameters,Performance Analysis Of Digital Communication System Using Matlab And Verilog HDL3

International Journal Of Electrical, Electronics And Data Communication, ISSN: 2320-2084Volume-4, Issue-5, May.-2016Fig 13: BPSK waveform using XilinxFig 10: BFSK waveform while using XilinxIII. USING OFDM NETWORKII. BPSK MODULATIONCASE 1: WITHOUT USING MODELSIM.Now it is necessary is to show a good level ofsimilarity between actual and a same kind ofwaveform in an application oriented system. So thepaper proposed a novel original OFDM system withits implementation level sampling frequency taken tobe as fs 4e-6 seconds. In a given time frame numberof bits transmitted is approximately 3.6 billion bits,similarly the number of error bits is 552, so error rateis approximately is 1.5e-6.CASE 1: WITH MATLAB.This is the binary phase shift keying, figure 11 showsthat BPSK has been implemented using MATLABand the results in figure 11 indicates a change inphase of original modulated waveform.Fig 14: OFDM Communication NetworkFig 11: BPSK waveform using MatlabError rate 1.533e-06Num error 552Num bits 3.6e 08Similarly figure 15 is a direct implementation ofOFDM system spectrum visualization usingSpectrum Scope directly connected to OFDMtransmitter covering a frequency span of 20 MHz at aresolution frequency of approximately 19.53 KHz.CASE 2: WITH MATLAB AND MODELSIM.In this section BPSK modulation has been partiallyimplemented in Verilog and the results are evaluatedfor MATLAB and modelsim cross compliation.Fig 12: BPSK waveform using ModelsimCASE 3: WITH XILINX.In this section figure 13 has shown that if thecomplete code is implemented using ISIM only usingsame Verilog codes used earlier in cross linking thenISIM only shows same results of evaluation.Fig 15: Spectrum Scope Output for OFDM Transmitterwithout using ModelsimPerformance Analysis Of Digital Communication System Using Matlab And Verilog HDL4

International Journal Of Electrical, Electronics And Data Communication, ISSN: 2320-2084Figure 16 is visualization of OFDM constellationdiagram observed directly after QAM mapper. This isa ideal transmitter constellation diagram.Volume-4, Issue-5, May.-2016Error rate 1.506e-06Num error 550Num bits 3.6e 08In this figure19 the implementation spectrum hasbeen seen, the figure in figure 15 with exactsimulation of OFDM and figure 19 with mdolsimimplementation has little difference in spectrumvisuals. Both figures has same parameter indicating agood level of preciseness in results.Fig 16: Transmitted Signal for OFDM Tx.In figure 17 the signal received after AWGN channeland then processing like removal of zero padding andcyclic prefix and fast Fourier transform has been doneand finally before demodulation this constellationdiagram has been shown indicating severe noise inthe communication channel.Fig 19: Spectrum Scope Output with modelsimFigure 20 is the received constellation diagram ofOFDM signal indicating a good level of noiseintroduced due to which a good level of phaseshifting in QAM points can be seen.Fig 17: Received Signal for OFDM TxCASE 2: WITH MODELSIM.In this section the complete communication systemremains same but there is one block which has beenchanged to identify the affect of model sim inVerilog.Fig 20: Received Signal with modelsim blockIn figure 21, the noiseless transmitted signalconstellation diagram is seen.Fig 18: OFDM Communication Network using ModelsimPerformance Analysis Of Digital Communication System Using Matlab And Verilog HDL5

International Journal Of Electrical, Electronics And Data Communication, ISSN: 2320-2084Volume-4, Issue-5, May.-2016for doing research. All through the work, in spite ofhis busy schedule, he has extended cheerful andcordial support to me for completing this researchwork.REFERENCES[1][2][3]Fig 21: Transmitted block with modelsim.S.Rajaram and R. Gayathre,”FPGA Implementation ofDigital Modulation Schemes”, International journal ofinnovative research in science, engineering andtechnolgy,vol 3, march 2014Rajesh R. Bhambare and Dr. Rajeshree D. Raut,”A surveyon Digital Modulation Techniques for Software DefinedRadio Applications”, IRACST-International Journal ofComputer Networks and Wireless Communications,Vol.3,No3,June 2013Black Team, Jia Liu, Erik Bergenudd, Vinod Patmanathan,Romain Masson, OFDM Project, Final report, 2E1367 Project Course in Signal Processing and DigitalCommunication, KTH, Stockholm,30th May 2005.QPSK Modulation and Demodulation, ELE 791 SoftwareRadio Design, Yinhua Wang, Michael Chow, Sheng-MouCONCLUSION[4]After a complete analysis done in this paper withrespect to three basic modulation schemesimplemented in digital modulation systems. Thecomplete system is a example system of two differenttechniques namely OFDM system and ModelSimbased OFDM system. When the two communicationmodels are taken then the implementation of OFDMin SIMULINK indicates a error rate of 1.5e-6,similarly in OFDM system in SIMULINK if oneblock is replaced then also the error rate isapproximately 1.5e-6. So conclusion can be drawnthat even if simulation is done or its implementationis done the same result is found.Yu, Dec 14 2004, Syracuse University, Department ofElectrical Engineering.[5] SB Pokle, K D Kulat & A G Keskar, MATLABSimulation of a Fuzzy Controller for Attitude Control of aGeostationary Satellite, IETE Journal of Education, vol45, no 4, Oct-Dec 2004, pp 203-209.[6] SB Pokle & K D Kulat, OFDM Techniques: A NovelApproach for Design of Wireless Communication System,Proceeding of National Level Conference on AdvancedCommunication Techniques, Act-2005 at BIT Durg, April5-6, 2005, pp 140-150.[7] S.B.Pokle, K.D.Kulat, Matlab simulation of wirelesscommunications using OFDM principle, IETE Technicalreview, vol 23,no 3,may-june2006,pp187-197.[8] Martin Toeltsch, Andreas Molisch, Efficient OFDMTransmission without Cyclic prefix over Frequencyselective channels, IEEE 11th International Symposium onPersonal, Indoor and Mobile Radio Communications,September 18-21, 2000, London, (UK).[9] L Hanzo, M Munster, B J Choi & T Keller, OFDM andMC-CDMA for broadband multi-user Communications,New York: IEEE press, 2000.[10] Eldo Mabiala, Mathias Coinchon , Karim Maouche “Studyof OFDM modulation” Eurecom institute, December 1999.thACKNOWLEDGMENTSI would like to express my deepest gratitude to myguide, Mr. Anurag Singh his valuable guidance,consistent encouragement, personal caring, timelyhelp and providing me with an excellent atmosphere Performance Analysis Of Digital Communication System Using Matlab And Verilog HDL6

International Journal Of Electrical, Electronics And Data Communication, ISSN: 2320-2084 Volume-4, Issue-5, May.-2016 Performance Analysis Of Digital Communication System Using Matlab And Verilog HDL 2 channel will expel the high-recurrence segments of the BASK signal. The yield is a band restricted sign,

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