modulation and demodulation slideshare

To calculate the modulation index of an AM wave. The information signal is then converted to the required format. Frequency Modulation (FM): Here, the frequency of the carrier wave is changed according to the information signal In other words, the signal is multiplied by a square wave at the carrier frequency Although the sigma-delta modulator was first intro- In linear modulation, the amplitude of the transmitted signal varies linearly with the modulating digital signal, m(t) Observe the demultiplexed . The amplitude modulation definition is, an amplitude of the carrier signal is proportional to (in accordance with) the amplitude of the input modulating signal. demodulation trainer st2102, cme313 lab manual pulse amplitude modulation experiment 5, pulse amplitude modulation slideshare , experiment 4 pcm demodulator site iugaza edu ps , pulse amplitude modulation kfupm , experiment 7 pulse code modulation pcm part 2 odai, 50 - D1 ASK - amplitude shift keying ASK - AMPLITUDE SHIFT KEYING ACHIEVEMENTS: generation and demodulation of an amplitude shift keyed (ASK) signal. The Binary Phase Shift Keying (BPSK) modulation and demodulation takes place with the input given by the user and this code doesn't need any additional toolbox. View License. Phase detector ( phase comparator): It is a mixer (multiplier) followed by a low pass filter. Consider for example a sinusoidal carrier signal. . Scribd is the world's largest social reading and . We know that the standard formula for power of cos signal is. At the receiver, the information signal is separated from the carrier. Analog Communication - Modulation. Again, we want maximum separation between the phase options, which in this case is 90. The output voltage of the PD . To be familiar with AM modulator and demodulator. Slideshare uses cookies to improve functionality and performance and to provide relevant advertising. In the file, you only need to change the value of the modulation index . n practice, problems arise in baseband transmissions, he major cases being: noise in the system - external noise and circuit noise reduces the signal-to-noise (s/n) This will restrict the signal amplitude to the range -VL to +VL . Amplitude Modulation ppt SlideShare. The quantization design is simple. Amplitude Modulation And Demodulation Lab Report. s ( t) = A m A c 2 cos. . - The block diagram of PLL: PLL Components 1. The resulting transmitted single for one bit time is. Types of Analog Modulation. Connect the demodulated pam waves, and note simultaneously by varying . Phase Modulation Theory Time Domain Frequency Domain. Amplitude Modulation and Demodulation I. The primary 4 categories of the mechanism of Modulations are: Analogue modulation. We will now introduce modulation and demodulation. Channel coding (Block codes and Convolutional codes) - Chapters 6, 7, and 8 in Sklar. 1. translation back to baseband, with recovery of the bandlimited message waveform 2. regeneration from the bandlimited waveform back to the binary message bit stream. The m-file pre6_2.m is a function file for this procedure. from one location to another. An over-sampled input is taken to make full use of the signal correlation. Types of modulation Modulation is of three types they are: 1)Amplitude 2)Frequency 3)Phase Frequency modulation In telecommunications and signal processing, frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. 3. In the amplitude modulation scheme, we can modulate one message signal (input signal) which is in analog form. [ 2 ( f c f m) t] for the lower sideband. PHASE MODULATION (PM) As the name implies, phase modulation, PM uses variations in phase for carrying the modulation, while the amplitude of the carrier signal is kept constant. QPSK is a modulation scheme that allows one symbol to transfer two bits of data. VSB modulation represents a compromise between SSB and DSB modulation systems. It is easy to separate out signal from noisy signal. The simulation involves, generating random message bits, modulating them using QPSK modulation, addition of AWGN channel noise corresponding to the given signal-to-noise ratio and demodulating the noisy signal using a coherent QPSK receiver. Different Types of PWM Techniques analysis for Z Source. The channel refers to the physical medium carrying the information signal (voice, video, data etc.) 50 - D1 ASK - amplitude shift keying ASK - AMPLITUDE SHIFT KEYING ACHIEVEMENTS: generation and demodulation of an amplitude shift keyed (ASK) signal. Applications of Analog Modulation. Tektronix PG501A 2MHz Function Generator 3. FM Demodulation Phase Locked Loop: - PLL is a negative feedback control loop in which the feedback signal is used to lock the output frequency and phase of any input signal. Note * McGraw-Hill The McGraw-Hill Companies, Inc., 2000 Modulation enables the transfer of information on an electrical signal to a receiving device that demodulates the signal to extract the blended . The quantization design is simple. Amplitude Modulation. Avg rating:5.0/5.0. As an analoggic sign is contained in time and amplitude, a digital signal . Search: Analog Frequency Modulation Circuit. Pam modulation and demodulation lab manual free online pdf format . LinkedIn SlideShare. In this video, i have explained Amplitude Shift Keying ASK with following outlines.0. lies in the different definition of the modulation index SIGMA-DELTA modulation is a widely used and thor- oughly investigated technique for converting an analog signal into a high-frequency digital sequence, Thus, there are infinitely many possible carrier frequencies At the receiving end, a tuner latches onto the particular carrier frequency and a demodulator circuit isolates the data from . The quality is moderate. This is regarded as the most robust digital modulation technique and is used for long . This will relax the filter design at the cost of some additional bandwidth . The quality is moderate. Objectives 1. stage 1 Any modulated signal has a high frequency carrier. This code generates BASK, BPSK and BFSK signals from a randomly generated n-bit message sequence and then plots their demodulated signal. detection, amplifiers) Given any modulation scheme, it is possible to obtain its signal constellation. ).. Where is usually 4.

Then inner products (dot products) are <m,m>=1 <n,n>=1 <m,n>=<n,m>=0 Can interpret inner product as projection of vector 1 ("v1") onto vector 2 ("v2")in other words, inner product of v1 and v2 tells us "how much of vector 1 is there in the direction of vector 2." Pulse amplitude modulation is the simplest form of modulation. An over-sampled input is taken to make full use of a signal correlation. As analog modulation consists of various types (amplitude, frequency, and phase), there is a wide range of applications using these techniques. Thus, there are a few primary modulation mechanisms that we mainly take into practical and usable categorization. The modulator shown on Slide 7-6 is also a block diagram for a demodulator that implements the formula at the bottom of the previous slide if Amplitude Modulation Using a Complex Exponential Modulation: Demodulation: Amplitude Modulation Using a Sinusoid. The practical manifestation of this is the following: If there are differences between the phase (or frequency) of the oscillators used for modulation and demodulation, PSK becomes unreliable. Toolbox; Zip . An AM signal has the mathematical form s(t) = Ac[1+kam(t)]cosct where m(t) is the basebandmessage. The PLL consists of three basic components: A. Slides: 20 Download presentation MODULATION AND DEMODULATION What is modulation? Follow; Download. P t = P U S B = P L S B. Features of Delta Modulation. Modulation. In AM, there is a modulating signal. Broadcast FM signals are filtered by a band-pass filter prior to transmitting. Where = 2 most often. Performance simulation over AWGN. The input sequence is much higher than the Nyquist rate. SlideShare 1) VSB The stringent frequency response requirement 0n the side band . Mechanism of Modulations. EXTRA MODULES: DECISION MAKER PREPARATION generation Amplitude shift keying - ASK - in the context of . - The modulation scheme needs to be cost efficient Circuitry should be simple to implement and inexpensive (e.g. This is also called an input signal or baseband signal (Speech for example). Vestigial Sideband Modulation (VSB) Some observations SSB modulation is well suited for transmission of voice signals (or for all signals which exhibit a lower component at f 0). S (t) =A* cos (2*pi*fc*t) for binary 1. introduction to modulation andintroduction to modulation and demodulationdemodulation the purpose of a communication system is to transfer information from a source to a destination.

Slideshare uses many advantages over bandpass channels. Digital Modulation in munications Systems An Introduction. The modulation and demodulation of QAM signals are more complex and in turn more expensive than alternative formats. 5.0 (1) 474 Downloads. Digital modulation. The stair-case approximation of output waveform. On the other hand, the constellation points of higher order QAM lie further . SSB Demodulator Using a Hilbert Transform (cont.) Definition: Amplitude Modulation is a technique by which the amplitude of the carrier wave is changed according to the signal wave or modulating signal.Among various modulation schemes, amplitude modulation is the simplest and oldest modulation technique. The binary signal when ASK modulated, gives a zero value for Low input while it gives the carrier output for High input.. The simplest BPSK scheme uses two phases to represent the two binary digits and is known as binary phase-shift keying. There are four possible two-bit numbers (00, 01, 10, 11), and consequently we need four phase offsets. The advantage is higher data rate: if we maintain the same symbol period . Demodulation of FM Signal Slide 13 Slide 14 Slide 15 Slide 16 Phase-Locked Loop (PLL) - negative feedback. Basically, the information that is carried by the low frequency modulating signal is superimposed on the carrier wave of high frequency by . Phase detector ( phase comparator): It is a mixer (multiplier) followed by a low pass filter. Translation back to baseband requires a local, synchronized carrier. PREREQUISITES: it would be advantageous to have completed some of the experiments in Volume A1 involving linear modulation and demodulation. p. 5 ELEC 7073 Digital Communications III, Dept. and the other can be represented by a cosine wave (i.e. Vectors and modulation CSE 466 Interfacing 3 S'pose m and n are orthogonal unit vectors. A randomly generated n-bit message sequence and defined carrier signal are used to generate BASK, BPSK and BFSK signals along with additive white Gaussian noise. To investigate amplitude modulated signal in the time domain and the frequency domain. Cite As Jakir Hussain G K (2022). double side band amplitude modulation and demodulation dsb am' 'es442 lab 6 frequency modulation and demodulation june 19th, 2018 - frequency modulation and demodulation carrier frequency is varied in direct proportion to changes in the amplitude of 1 using the provided matlab code' 'matlab code for frequency modulation fm with modulation To convert the containing time signal into discreet time signal, a process is used called sampling. BPSK demodulation Demodulation of a BPSK signal can be considered a two-stage process. AMPLITUDE MODULATION Auburn University. Modulation : Whenever the message or information signal rides over the carrier, it is called modulation. The following figure represents ASK modulated waveform along with its . Carrier wave a high-frequency electromagnetic wave modulated in amplitude or frequency to convey a signal Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. - Represent each possible signal as a vector in a Euclidean space spanned by an orthonormalbasis. The information signal . The output voltage of the PD .

Instantaneous power of PPM modulated signal remains constant due to constant pulse widths and pulse amplitudes. FM Demodulation Phase Locked Loop: - PLL is a negative feedback control loop in which the feedback signal is used to lock the output frequency and phase of any input signal. S (t) =A *cos (2*pi*fc*t+pi) for binary 0. Analog I/Q Modulation-Transceiver I/Q signals take on a continuous range of values (as viewed in the time domain) Used for AM/FM radios, television (non-HDTV), and the first cell phones Newer systems typically employ digital modulation instead Receiver Output 2cos(2f 1t) 2sin(2f 1t) Lowpass i r(t) Lowpass q r(t) i t q t 2cos . Implementation of BASK Modulation and Demodulation. Following are the benefits or advantages of PPM: Noise interference is less or minimum due to constant amplitude. II. HAPTER Modulation and Demodulation.

And the effective utilization of channel bandwidth is not up to the level. Modulation, demodulation and detection (baseband and passband) - Chapters 2, 3 and 4 in Sklar. Number of Views: 20577. . Spread spectrum method. - PowerPoint PPT presentation. Power of SSBSC wave is equal to the power of any one sideband frequency components. In other words when phase modulation is applied to a signal there are frequency changes and vice versa.