I have simulated double side band with large as well as supressed carriers. Pada modulasi analog, sinyal pemodulasi, berupa sinyal analog, digunakan untuk memodifikasi sinyal pembawa. Among the types of modulation techniques, the main classification is continuouswave modulation and pulse modulation. What is amplitude modulation, am electronics notes. The transmission bandwidth required by dsb sc is b t2b.
Amplitude modulation matlab code download free open source. Amplitude modulation, am is the most straightforward way of modulating a signal. The technique which usually used are phase shift keying psk, frequency shift keying fsk and quadrature amplitude modulation qam. View 110715280amplitudo modulasi uploadbyteuinsuska2009wordpresscom. Dalam sistem transmisi komunikasi proses modulasi dan demodulasi sangat berpengaruh terhadap.
Hasil pengujian sistem yang telah dilakukan pada ebno dengan rentang 0 hingga 30 db menunjukkan, adanya peningkatan kinerja sistem pada modulasi mpsk dari 0,052 sampai dengan 0,8546, dan. Quadrature amplitude modulation is widely used for carrying many digital signals, everything from wifi to mobile phone communications and very much more. Amplitude modulation is used in a variety of applications. Both amplitude and phase of ft carry information of ft. Modulasi yang digunakan komunikasi konvensional adalah modulasi amplitudo am.
This file is licensed under the creative commons attributionshare alike 3. Files are available under licenses specified on their description page. Amplitude modulation is demonstrated with modulating signal and modulated signal displayed in the scope. Modulasi ask amplitude shift keying sistem komunikasi prodi d3 tt yuyun siti rohmah, st. While amplitude modulation is one of the simplest and easiest forms of signal modulation to implement, it is not the most efficient in terms of spectrum efficiency and power usage. Modul 1 modulasi analog tujuan praktikum amplitude. Design and implementation of amplitude modulator and demodulator introduction communication is the most important needs from the very beginning of civilization. The code for amplitude modulation am with control of modulation index ma has been developed using matlab according to conventional theory. Sebaliknya, pada penerima dilakukan demodulasi demodulation yaitu mengambil kembali informasi dari gelombang termodulasi, alatnya disebut demodulator.
Jun 30, 2019 the first recorded instance of its use was in when a signal was transmitted by a canadian engineer named reginald fessenden. Farshad lahouti january 20, 2003 winter 2003 uw, ece 318 lecture notes 2 information source signal modulator propagation channel signal demodulator information destination analog communication system analog signals may be transmitted directly via carrier modulat ion over. Sep 29, 2016 matlab tutorial amplitude modulation how to generate amplitude modulation am using matlab. This form of modulation is essentially derived from two carriers that are 90 out of phase and adding information, either analogue or digital. Matlab code for amplitude modulation am file exchange. Modulasi frequency modulation electrical engineering. Amplitude modulation am is a method of impressing data onto an alternatingcurrent ac carrier waveform. Example 21 determine the baud and minimum bandwidth necessary to pass a 10. Modulasi adalah proses penumpangan informasi yang terkandung dalam sebuah rentang frekuensi pada sebuah frekuensi pembawa. Radio sendiri adalah teknologi yang digunakan untuk pengiriman sinyal dengan cara modulasi dan radiasi elektromagnetik gelombang elektromagnetik. Tapi tidak semua orang mengerti bagaimana cara kerja radio. Amplitude modulation am is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. Doc makalah mengenal modulasi ahmad jurnaidi wahidin. In amplitude modulation, the amplitude signal strength of the carrier wave is.
Demodulation of am can similarly be undertaken in a number of ways. Analisis kinerja penggunaan modulasi qpsk, 8psk, 16qam. Sinyal pembawa sinusoidal dengan frekuensi 3 khz mempunyai amplitude puncak 2 volt dimodulasi am oleh sinyal audio 750 hz yang mempunyai amplitude puncak 750 mv. Here the envelope of the carrier can be seen to change in line with the nodulasi signal. Sedangkan modulasi amplitude adalah proses pengubahan ampitudo sinyal carrier sesuai dengan amplitude sinyal informasi. Amplitude modulation matlab code download free open. You may do so in any reasonable manner, but not in. Amplitude modulation matlab tutorial amplitude modulation. Frequency of modulating signal is 100 hz and frequency of carrier is 8000 hz cite as k. Am works by varying the strength amplitude of the carrier in proportion to the waveform being sent.
Matlab tutorial amplitude modulation how to generate amplitude modulation am using matlab. Aug 31, 2019 while amplitude modulation is one of the simplest and easiest forms of signal modulation to implement, it is not the most efficient in terms of spectrum efficiency and power usage. Modul 1 modulasi analog tujuan praktikum amplitude modulation. Amplitude modulation introduction amplitude modulation is the simplest and earliest form of transmitters am applications include broadcasting in medium and highfrequency applications, cb radio, and aircraft communications basic amplitude modulation the information signal varies the instantaneous amplitude of the carrier am characteristics am is a nonlinear process sum and. Sinyal am amplitude modulation modulasi analog sinyal psk phase sift keying modulasi digital 3. Essentially the simplest is to pass the rf carrier and the modulating signal into a mixer. Ada 3 jenis modulasi analog yang diuraikan dalam modul ini, yakni modulasi amplituda, modulasi frekuensi, dan modulasi fasa.
Modulasi sudut modulasi eksponensial modulasi sudut modulasi eksponensial sudut gelombang pembawa berubah sesuai. For a perfect modulation, the value of modulation index should be 1, which implies the percentage of modulation should be 100%. Basic concept of modulation the information source typically a low frequency signal referred to as the baseband signal carrier a higher frequency sinusoid example. A continuouswave goes on continuously without any intervals and it is the baseband message signal, which contains the information. Prinsip dasar modulasi lanjutan parameter yg dpt diubah adalah. The highest frequency of the modulating data is normally less than 10 percent of the carrier frequency. Pulse amplitude modulation pam amplitude modulation am modulasi jenis ini adalah modulasi yang paling sederhana gelombang pembawa carrier wave diubah amplitudonya sesuai dengan signal informasi yang. Amplitude modulation amplitude modulation is defined as a process in which the amplitude of the carrier wave a c cos27rf c t is varied about a mean value, linearly with the baseband message signal mt, where, a c is the carrier amplitude, f c is the frequency of the carrier signal and t is time. The output shows the two modulations in both frequency and time domains.
The rate of change of the ask waveform baud is the same as the rate of change of the binary input bps. All structured data from the file and property namespaces is available under the creative commons cc0 license. Modulasi amplitudo dan frekuensi semua orang pasti mengenal radio. It requires that the amplitude of the dc a part of a t is equal to the amplitude of the ac part a. Sebuah sinyal 3000hz dengan amplitude 5v digunakan untuk memodulasi phasa carrier, konstanta deviasi phasa adalah 1 radv.
Oct 17, 2005 the codes in two files generate time and frequency domain representation of three basic types of amplitude modulation. Jenis modulasi menggambarkan besaran dari sinyal pembawa yang dimodifikasi. The message signal is, for example, a function of the sound to be reproduced by a. Alat yang digunakan sebagai modulator adalah ssg standart signal generator. Amplitude modulation am in time and frequency domain. Apabila ebno dinaikan menjadi 8 db maka ber modulasi qpsk menjadi lebih kecil yaitu sebesar 0,00035, pada 8qam diperoleh ber sebesar 0,0076 sedangkan pada modulasi 16qam menjadi 0,09.
Amplitude and frequencyphase modulation zurich instruments. These form some of the main uses of amplitude modulation. You can publish your book online for free in a few minutes. Qam is a natural extension of binary phase shift keying bpsk and. Contoh modulasi adalah proses penyiaran suara atau musik yang dipancarkan melalui sebuah pemancar radio.
Full text of implementation of amplitude modulation on. Am is a method of transmitting signals, such as sound or digital information, in which the amplitude. The testing with the change of the amplitude of modulation signals, is obtained that the program was fail to classify bpsk, qpsk and fsk at the altering of the amplitude of modulation signals. However in its basic form, this form of modulation is being sued less as a result of its inefficient use of both spectrum and power. It requires that the amplitude of the dc a part of at is equal to the amplitude of the ac part a. The continuous wave modulation techniques are further divided into amplitude modulation and angle modulation. Sebaliknya, pada penerima dilakukan demodulasi demodulation yaitu mengambil kembali informasi dari gelombang termodulasi, alatnya. Amplitude modulation matlab tutorial amplitude modulation in. Pdf modulasi amplitudo dan frekuensi free download pdf. Unicamp university of campinas, state of sao paulo pdf. Instead of modulating the amplitude of two carrier waves, cap generates a qam signal. Adaptation of the information signal to the transmission channel shift of the information signal to an assigned frequency band jf wj jfwj w w w w wc wc wc wc. The i and q bits control the carrier waves amplitude, if bit is 0, then the amplitude is 0.
Penumpanganini dilakukan dgn mengubahubah parameter dari gelombang pembawa secara proporsionalsesuai dgn sinyal informasi. Am is a method of transmitting signals, such as sound or digital information, in which the amplitude of carrier wave is changed according to the. Perbandingan perubahan ini terhadap amplitudo pembawa tak termodulasi disebut factor modolasi. The instantaneous amplitude overall signal power varies depending on the instantaneous amplitude of the modulating data. View 110715280amplitudomodulasiuploadbyteuinsuska2009wordpresscom. This means that their ratio is unity at the output of the adder, which forces m to a magnitude of exactly unity. Kemajuan kehidupan manusia dalam berbagai aspek kehidupan, telah memaksa mereka untuk senantiasa terus melakukan transformasi menciptakan suatu tatanan kehidupan modern yang baru, sehingga dapat mempermudah melakukan segala hal yang berkaitan dengan. Here the envelope of the carrier can be seen to change in line with the modulating signal. In amplitude modulation, the amplitude signal strength of the carrier wave is varied in proportion to that of the message signal being transmitted.
Untuk membuat modulasi am, maka yang di setting adalah mod am. Amplitudo modulasi am am envelope am doublesideband full carrier. The first recorded instance of its use was in when a signal was transmitted by a canadian engineer named reginald fessenden. Spektrum frekuensi gelombang termodulasi am penyelesaian. Subscriber line hdsl transmission system on metallic local lines pdf. Pdf carrier amplitude phase modulation carrierless amplitude phase modulation cap is a variant of quadrature. Teknik telekomunikasi dasar kuliah 3 modulasi amplitudo. Teknik modulasi quadrature amplitude modulation sigit kusmaryanto. A lockin amplifier can find the amplitude as and phase.
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