Implementation of FPGA Technology for Digital Modem
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This report focuses on the implementation of FPGA technology for designing and implementing a digital modem. It includes a literature review, design methodologies, and project timeline.
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FPGA 1 Abstract FPGA is defined as the field programmable gate array which is an integrated circuit that can be programmed in the field after manufacture. Mainly, such kind of technology is used in the design and implementation of particularly integrated circuits which can later be produced hard wired in huge quantities [8]. It is observed that the FPGA technologyallowconsumerstotailormicroprocessorsinordertomeettheir requirements. This report is completely based on the GPGA technology along with their implementation process. A literature review will be conducted in this research study in ordertoanalysetheviewpointsofotherexpertsandresearchersaboutFPGA technology. This report is divided into several sections, for example, statement of design, literature review, design methodologies, project timeline.
FPGA 2 Aims and objectives There are numerous aims and objectives of this study which are described below: To analyse the concept of FPGA technology To evaluate and implement the GPGA technology for digital modern To enhanceskills and experience in the field of FPGA Forachievingalltheaboveaimsandobjectivesa literature review anddesign methodology sections will be involved where the researchers will provide in-depth analyse about FPGA implementation. In the literature review section, there are numbers of research papers will be discussed along with the research gaps and collect opinions of other researchers on the implementation of FPGA. Statement of design For designing and implementing the digital modem on FPGA technology the frequency modulation and demodulation processes can be used because it is one of the effective techniques for modulating the applied frequency signals. The FM modulator will modify the frequency of the applied signal by multiplying with the carrier signals and the receiver will receive the effective output by using this technique [9]. The simulation process will be done with the help of FPGA technology and Xilinx ISE software will be adopted for synthesis and implementation of the circuit. ThisresearchproposaliscompletelybasedontheFPGAtechnologyand implementation of FM modem with the help of FPGA technique. Moreover, this paper focuses on the fundamental concept of FM modem along with the FPGA process for designing and implementing the frequency modulators. The frequency modulation and demodulation is mainly used for supporting the DAB-T and PMR standards but such kind of process can be used in the field of the digital modem for improving the frequency level of applied input signals. The digital modem is defined as the technique which adapts digital signals from one transmission networks to another and this report will design and implement FPGA system of a digital modem [9]. With the help of this research study, the students can enhance their skills and they can easily understand the fundamental working of FPGA technology with the digital
FPGA 3 modem. In this study, an FPGA implementation of a digital modem will be done for targetingthesoftwaredefinedradio(SDR)applications.Bothmodulatorand demodulator involve a compressed direct digital synthesizer (DDS) for producing the carrier frequency waves in order to modulate the input signal. The demodulation process will be done with the help of a digital phase locked loop (DPLL) approach because it is one of the best processes for collecting the information and signals from modulated signals. However, the proposed digital modem will be implemented with the help of Virtex 2 pro device and FPGA chip will be used for connecting the components with the devices in the circuit. However, the digital modem is defined as the modulation technique where the applied input signal is modified with the help of a carrier signal. The below diagram indicate the block diagram of FM modulator which contains the multiplexer, ACCUM, DDS technique for modulating the frequency of input signal. The FM demodulator circuit is used before the receiver circuit in order to demodulate the applied signal with the help of a digital phase locked loop. Demodulating the modulated signal is one of the challenging tasks which require more efforts and time rather than modulation technique. In this project, a direct digital synthesizer is used for demodulating the modulated signal in an effective manner [10]. The research problem associated with this project is designing and implementing the digital modem with the help of FPGA technology which required numbers of devices and components for connecting each terminal of FPGA chip with the circuit diagram. In this project Xilinx ISE software will be utilized for implementation of FPGA and XST tools will be adopted in order to synthesis the results or outcomes of the digital modem.
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FPGA 4 Literature review The FPGA implementation of the digital modem is one of the common topics for research and in the last five years there are numbers of investigators provided their viewsonthistopic.Theliteraturereviewsectionfocusesonthedesignand implementation of FPGA and analyses results obtained by previous journal papers. This literature review will reduce the drawbacks and research gaps occurred in the previous studiesandhelpthestudentsforanalysingthefundamentalconceptofFPGA implementation. According toAhmad and Gupta, (2013)the FPGA implementation can be performed with the help of direct digital synthesizer and modulation techniques [1]. This journal paper highlighted the concept of FPGA technology and implemented a digital FM modem by using FPGA technique. The researchers analysed that both modulation and demodulation process can be achieved with the help of the DDS technique and it allows consumers to generate the carrier signals. After analysing this journal paper it has been found that the implementations of frequency modulation modem can rum maximum 103 MHz frequency by taking around 8K gate equivalent in the FPGA device. Atalik, et al., (2012) designed and implemented a digital modem by using modulation and demodulation techniques [2]. After analysing this research paper it has been argued that mixed demodulation is one of the best techniques for generating a digital FM demodulator. The researchers implemented the digital FM modem on FPGA devices and conducted a literature review in order to improve the effectiveness of the investigation. The FM modulation is defined as the technique that has the potential to increase the frequency of the input signal by multiplying with the carrier signal. From this paper, it is analysed that the mixed demodulator technique takes less time for demodulating the signal and information and the researchers used this approach for gathering the input message. BritoandBampi,(2008)comparedtheresultsofFPGAimplementationofFM demodulator and other proposed systems [3]. The researchers also suggested that the PLL is one of the effectivedemodulation techniques and it provides a way for implementing the FM demodulation process with the help of FPGA technique. In this research paper, a survey has been conducted by the authors for gathering viewpoints of
FPGA 5 other participants and observed that the PLL demodulator circuit can be implemented byusingaPLLprocess[11].TheauthorsinvolvedaModalismprocessfor implementation and simulation of FM modem and provided in-depth analysis of the research topic. According toDemirors, et al., (2015) the VCO is a very old technique which produces numbers of challenges in the system due to which many consumers are using direct digital synthesizer technique for modulating the applied signal [4]. In this paper, numerous researches on the different architecture of FM demodulator have been performed in order to realize an FM demodulator nitrated circuit. In this journal paper, the researchers used FPGA Modelsim Xe 6.3c software in order to simulate and implement the frequency modulation project on FPGA chip [16]. The researcher identified that at the first phase of simulation, the demodulated output produces overshoots since the phase synchronization is in convergence with the input phase and after this stage, the overall system has been stabled. Hatai and Chakrabarti, (2009)analysed that the synthesis optimization technique plays a significant character in the field of FPGAs for achieving the large performance in terms of resources utilization [5]. This paper identified the key aspects related to FPGA technique and provided their opinions regarding synthesis optimization for finite machine design. In order to analyse and implement the source code for FPGA, there are various kinds of tools used, for example, Xilinx, Quartus, Altera and so on. Mainly, the FPGA technique and software provide a platform for designing and implementing the digital modem and variety of design constraints which can help the consumers to meet the aims and objectives of projects [15]. This paper provided theoretical information about FPGA technique and provided some information about synthesis optimization technique which creates a research gap between the information and research question. This literature review avoids all these research gaps and provides an in-depth analysis of the research topic and involves the findings and results of previous research studies. According toJyothi, Jayaprakash and Gowda, (2015), the software defined ratio is defined as a wireless communication system in which all of the signal processing is implemented on FPGA technology [6]. This paper highlighted the applications of FPGA technology and designed a digital FM demodulator system based on the 2ndorder phase locked loop. The researchers adopted an ADPLL technique for demodulating the
FPGA 6 modulated signals or messages because it is more effective and highly accurate which reduce the distortions and provide an efficient signal to the receiver [12]. Kislal, Demiray, Ceylan and Yagci, (2015)identified that there are several other technologies and methods by which the frequency of input signal can be computed from the ratio of the in-phase and the quadrature components [7]. After evaluating this research paper it has been found that digital implementation of FM demodulators in software often does not meet the requirements of communication systems for which many developers use FPGA technique. In the implementation of digital modem, there are major two processes used such as FM modulation and FM demodulation process. The modulation process helps the designers for improving the frequency of transferred signals and demodulator process again demodulate the signal into original information. Many researchers suggested that the DDS is the very best technique for implementing digital modem where it improves the performance of the complete circuitry process [13]. Therefore, it has been suggested that during generation and implementation of digital modem the developers should adopt direct digital synthesize along with the PLL demodulator process [14]. For implementing the coding and circuit diagram the Xilinx software can be used that link the connecting wires with the electronic devices used in the implementation of FPGA project. Design methodology Initially, the researchers can use modulation technique for modulating the input message signals for which the FM modulator circuit can be adopted. Moreover, for generating the carrier signals the direct digital synthesize technique can be used which has the ability for improving the strength of the input signal. After that, an FM demodulator circuit can be designed by using the concept of digital phase locked loop. The demodulator circuit should involve several devices and techniques, for example, modulation output, phase detector, loop filter, FIR filter, DDS and demodulation output. For synthesize and implementation of results, Xilinx and FPGA software can be used along with the Modalism Xe 6.3c tools for simulating the applied input signals. For developing source code regarding the digital modem the MATLAB and FPGA tools can be adopted. There are several methodologies and steps are used for completing this project and achieving the effective results at the end of research which is the following:
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FPGA 7 Training on software and FPGA tools Research and study about the digital modem, modulation techniques and FPGA technology Design and simulate source code in FPGA software Ordering devices and components used for implementing digital modem Hands on with the development circuitry boards Debugging Testing and implementing digital modem on FPGA tools Analysing results and findings Final project submission With the help of all these steps and methods, the digital modem project can be implemented and simulate on the FPGA software. Therefore, the implementation of a digital modem should be done in the assigned time by following all the above steps along with the time plan. Time plan The time plan provides a brief idea about time duration required to complete this research project and it can be done in the current semester. The time plan depends on the various activities involved in the development and implementation of a digital modem by using FPGA technology. Finalise project project proposal training on coding simulation process order components and devices project report 660 30 25 30 10 Duration (Days) Duration (Days)
FPGA 8 Activity name Start DayLast Day Duratio n (Days) Finalise project 11-04- 2019 17-04- 20186 project proposal 18-04- 2019 18-06- 201860 trainingon coding 19-06- 2019 19-07- 201930 simulation process 20-07- 2019 15-08- 201925 order components and devices 16-08- 2019 16-09- 201930 project report 16-09- 2019 26-09- 201910
FPGA 9 References [1].A. Ahmad and, R., Gupta, “Digital PWM of cascaded multilevel voltage source inverter using FPGA,” In2013 Students Conference on Engineering and Systems (SCES), vol. 12, no. 2, pp. 1-5, 2013. [2].T., Atalik, M., Deniz, E., Koc, C.Ö., Gercek, B., Gultekin, M. Ermis and I., Cadirci, “Multi-DSP and-FPGA-based fully digital control system for cascaded multilevel convertersusedinFACTSapplications,”IEEEtransactionsonindustrial informatics,vol.8, no. 3, pp.511-527, 2012. [3].J.P.M. Brito and S., Bampi, “Design of a digital FM demodulator based on a 2nd- orderall-digitalphase-lockedloop,”AnalogIntegratedCircuitsandSignal Processing,vol.57, no. 1-2, pp.97-105, 2008. [4].E.,Demirors,G.,Sklivanitis,T.,Melodia,S.N.Batalamaand,D.A.,Pados, “Software-defined underwater acoustic networks: toward a high-rate real-time reconfigurable modem,”IEEE Communications Magazine,vol.53, no. 11, pp.64- 71, 2015. [5].I. Hatai and I., Chakrabarti, “FPGA implementation of a Digital FM Modem,” In2009 International Conference on Information and Multimedia Technology,vol. 12, no. 2,pp. 475-479, 2009. [6].N., Jyothi, S. Jayaprakash and, S.K., Gowda, “Design and VLSI implementation of high performance DUC and DDC for software defined radio applications,” In2013 International Conference on Emerging Trends in Communication, Control, Signal Processing and Computing Applications (C2SPCA), vol. 4, no. 4, pp. 1-3, 2013. [7].A.O., Kislal, A., Demiray, O. Ceylan and, H.B., Yagci, “Implementation of software defined FM mixed demodulator on FPGA,” In2015 23rd Telecommunications Forum Telfor (TELFOR), vol. 12, no. 1, pp. 333-336, 2015. [8].K.A.,Kumar,“FPGAimplementationofPSKmodemsusingpartialre- configuration for SDR and CR applications,” In2012 Annual IEEE India Conference (INDICON), vol. 8, no. 5, pp. 205-209, 2012. [9].M. Kumar and, K., Lata, “FPGA implementation of ADPLL with Ripple Reduction Techniques,”International Journal of VLSI Design and Communication Systems (VLSICS),vol.3, no. 2, pp.99-106, 2012.
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FPGA 10 [10].J. Mangala and, J., Manikandan, “FPGA implementation of reconfigurable modulation system,” In2015 International Conference on Advances in Computing, Communications and Informatics (ICACCI), vol. 8, no. 2, pp. 493-500, 2015. [11].M.A., Mohamed, A.S. Samarah and, M.F., Allah, “Implementation of the OFDM physical layer using FPGA,”International Journal of Computer Science Issues (IJCSI),vol.9, no. 2, p.612, 2012. [12].P. Noel and, M., Klemes, “Doubling the through-put of a digital microwave radiosystembytheimplementationofacross-polarizationinterference cancellation algorithm,” In2012 IEEE Radio and Wireless Symposium, vol. 12, no. 8, pp. 363-366, 2012. [13].S.O., Popescu, A.S. Gontean and, G., Budura, “BPSK system on Spartan 3E FPGA,”In2012IEEE10thInternationalSymposiumonAppliedMachine Intelligence and Informatics (SAMI), vol. 8, no. 7, pp. 301-306, 2012. [14].M., Saber, Y. Jitsumatsu and, M.T.A., Khan, “Design and implementation of low power digital phase-locked loop,” In2010 International Symposium On Information Theory & Its Applications, vol. 6, no. 7, pp. 928-933, 2010. [15].B.H.,Tietche,O.Romainand,B.,Denby,“ApracticalFPGA-based architectureforarbitrary-ratiosamplerateconversion,”JournalofSignal Processing Systems,vol.78, no. 2, pp.147-154, 2015. [16].R. Uma and, P., Dhavachelvan, “Synthesis Optimization For Finite State Machine Design In Fpgas,”International Journal of VLSI Design & Communication Systems,vol.3, no. 6, p.79, 2012.