modulation and demodulation slideshare

The Demodulated signals of the above noisy . 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. Amplitude Modulation Using a Complex Exponential • Modulation: • Demodulation: Amplitude Modulation Using a Sinusoid. One signal is called the in-phase "I" signal, and the other is called the quadrature "Q" signal. Description: Calculate the AM voltage distribution, modulation index, voltage ,power . This is also called an input signal or baseband signal (Speech for example). 50 - D1 ASK - amplitude shift keying ASK - AMPLITUDE SHIFT KEYING ACHIEVEMENTS: generation and demodulation of an amplitude shift keyed (ASK) signal. 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." • DSB generation is much simpler, but requires twice the signal bandwidth. Where is usually 4. stage 1 p. 5 ELEC 7073 Digital Communications III, Dept. 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. The modulation and demodulation of QAM signals are more complex and in turn more expensive than alternative formats. ).. Introduction to Multiple access techniques and wireless communications (if time allows) - Chapter 11 and 15 in Sklar. Slideshare uses cookies to improve functionality and performance and to provide relevant advertising. Mathematically, one of the carrier signals can be represented by a sine wave (i.e. ) 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 Some of the applications are: AM techniques are used in aircraft to establish communication between the pilot and the station and the other way too. The m-file pre6_2.m is a function file for this procedure. The channel refers to the physical medium carrying the information signal (voice, video, data etc.) As an analoggic sign is contained in time and amplitude, a digital signal . Pam modulation and demodulation lab manual free online pdf format . Implementation of BASK Modulation and Demodulation. Analog-to-analog conversion, or modulation, is the representation of analog information by an analog signal Pulse Width Modulation fundamentals of high frequency cmos analog integrated circuits Dec 04, 2020 Posted By Harold Robbins Library TEXT ID d625f241 Online PDF Ebook Epub Library circuits 2009 pages 318 isbn 0521513405 pdf 75 mb fundamentals . This is a low-frequency signal as we have seen earlier. An AM signal has the mathematical form s(t) = Ac[1+kam(t)]cosωct where • m(t) is the basebandmessage. There are four possible two-bit numbers (00, 01, 10, 11), and consequently we need four phase offsets. Any modulated signal has a high frequency carrier. Therefore, Analog modulation includes AM, FM and PM and these are more sensitive to noise. We will now introduce modulation and demodulation. The output voltage of the PD . Types of Analog Modulation. EXTRA MODULES: DECISION MAKER PREPARATION generation Amplitude shift keying - ASK - in the context of . The design of the modulator and the demodulator is simple. The quantization design is simple. The primary 4 categories of the mechanism of Modulations are: Analogue modulation. s ( t) = A m A c 2 cos. ⁡. Different Types of PWM Techniques analysis for Z Source. Broadcast FM signals are filtered by a band-pass filter prior to transmitting. Pulse amplitude modulation is the simplest form of modulation. • VSB modulation represents a compromise between SSB and DSB modulation systems. The two modulated carrier signals are transmitted together at the source and at the destination, these two carrier signals are demodulated (i.e . of E.E.E., HKU ¾Digital modulation involves choosing a particular analog signal waveform s i (t) from a finite set S of possible signal waveforms based on the information bits applied to the modulator. . Translation back to baseband requires a local, synchronized carrier. 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. 2 - Modulated FM signal is to pass it through a limiter. . Search: Analog Frequency Modulation Circuit. 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 . Phase detector (PD) B. Low-pass filter (LPF) C. Voltage controlled oscillator (VCO) Demodulation by Zero Crossing Detection Slide 19 Regeneration of Digital Signals and Bias Distortion Slide . The stair-case approximation of output waveform. An over-sampled input is taken to make full use of the signal correlation. - The block diagram of PLL: PLL Components 1. What is Modulation Amplitude Modulation AM Demodulation of AM. Follow; Download. 'HAPTER Modulation and Demodulation April 25th, 2018 - Modulation and Demodulation 14 1 2 Sharing using Frequency Division Figure 14 1 shows the electromagnetic spectrum from 3 kHz to 300 GHz it depicts how' 'Fsk Modulation And Demodulation SlideShare April 28th, 2018 - This Simulation Helps To Implement FSK Modulation And Demodulation On Is A . Modulation : Whenever the message or information signal rides over the carrier, it is called modulation. 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. 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. Objectives 1. × License. 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. Again, we want maximum separation between the phase options, which in this case is 90°. Basically, the information that is carried by the low frequency modulating signal is superimposed on the carrier wave of high frequency by . In this video, i have explained Amplitude Shift Keying ASK with following outlines.0. Modulation is a process through which audio, video, image or text information is added to an electrical or optical carrier signal to be transmitted over a telecommunication or electronic medium. S (t) =A* cos (2*pi*fc*t) for binary 1. An over-sampled input is taken to make full use of a signal correlation. - PowerPoint PPT presentation. It has highest power efficiency among all three types. Amplitude Modulation and Demodulation I. Thus, there are a few primary modulation mechanisms that we mainly take into practical and usable categorization. Multilevel ASK2. Amplitude Modulation ppt SlideShare. Modulation and Demodulation Introduction A communication system that sends information between two locations consists of a transmitter, channel, and receiver as illustrated in Figure 1. Tektronix PG501A 2MHz Function Generator 3. The quantization design is simple. Power of SSBSC wave is equal to the power of any one sideband frequency components. Connect the demodulated pam waves, and note simultaneously by varying . 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, Applications of Analog Modulation. So, these can be overcome by this QAM technique. PREREQUISITES: it would be advantageous to have completed some of the experiments in Volume A1 involving linear modulation and demodulation. The binary signal when ASK modulated, gives a zero value for Low input while it gives the carrier output for High input.. To calculate the modulation index of an AM wave. 'HAPTER Modulation and Demodulation April 25th, 2018 - Modulation and Demodulation 14 1 2 Sharing using Frequency Division Figure 14 1 shows the electromagnetic spectrum from 3 kHz to 300 GHz it depicts how' 'Fsk Modulation And Demodulation SlideShare April 28th, 2018 - This Simulation Helps To Implement FSK Modulation And Demodulation On Is A . The complete waveform simulation for the aforementioned QPSK modulation and demodulation is given next. In the amplitude modulation scheme, we can modulate one message signal (input signal) which is in analog form. It means we can give only one input signal and we can modulate it and transmit to the destination level. Amplitude Shift Keying ASK1. In other words when phase modulation is applied to a signal there are frequency changes and vice versa. The following figure represents ASK modulated waveform along with its . Channel coding (Block codes and Convolutional codes) - Chapters 6, 7, and 8 in Sklar. PREREQUISITES: it would be advantageous to have completed some of the experiments in Volume A1 involving linear modulation and demodulation. LinkedIn SlideShare. Features of Delta Modulation. To convert the containing time signal into discreet time signal, a process is used called sampling. 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. To be familiar with AM modulator and demodulator. EE4512 Analog and Digital Communications Chapter 5 Chapter 5 Digital Bandpass Modulation and Demodulation Techniques • Binary Amplitude Shift Keying • Pages 212-219 This is regarded as the most robust digital modulation technique and is used for long . GW Audio Generator (GAG-808B) 2. Number of Views: 20577. - Represent each possible signal as a vector in a Euclidean space spanned by an orthonormalbasis. Following are some of the features of delta modulation. The quality is moderate. Slideshare uses many advantages over bandpass channels. To achieve this it is necessary to change the frequency of the signal for a short time. To demodulate this waveform, it is a simple matter of passing the signal through two filters Armstrong wanted to generate WBFM using NBFM and frequency The sampling rate, or number of samples per second, is several times the maximum frequency of the analog waveform in cycles per second or hertz o modulation scheme and bandwidth, e txt) or view . The amplitude modulation definition is, an amplitude of the carrier signal is proportional to (in accordance with) the amplitude of the input modulating signal. Digital Modulation in munications Systems An Introduction. 50 - D1 ASK - amplitude shift keying ASK - AMPLITUDE SHIFT KEYING ACHIEVEMENTS: generation and demodulation of an amplitude shift keyed (ASK) 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. ¾For binary modulation schemes, a binary information bit is mapped directly to a signal and S contains only 2 Definition: Single sideband modulation (SSB) is an amplitude modulation scheme in which only a single sideband is transmitted through the channel. The PLL consists of three basic components: A. Modulation, demodulation and detection (baseband and passband) - Chapters 2, 3 and 4 in Sklar. Updated 25 Oct 2015. This will restrict the signal amplitude to the range -VL to +VL . In the file, you only need to change the value of the modulation index β. Illustrating the modulation steps in an FDM system AM Broadcasting History Frequency Long wave 153-270kHz Medium wave 520-1710kHz AM radio. Analog Communication - Modulation. Where = 2 most often. When you with a music and a communication network, comment on short wave or physical lab view is also be challenged and switch it is therefore provides many peaks. If noise enters into a system, it persists and gets carried up to the end receiver. We know that the standard formula for power of cos signal is. BPSK demodulation Demodulation of a BPSK signal can be considered a two-stage process. QPSK is a modulation scheme that allows one symbol to transfer two bits of data. Synchronous Demodulation of Sinusoidal AM • Assumptions: • = 0 (for now), • Local oscillator is synchronized with the carrier. EXTRA MODULES: DECISION MAKER PREPARATION generation Amplitude shift keying - ASK - in the context of . This will relax the filter design at the cost of some additional bandwidth . Toolbox; Zip . Amplitude Modulation. This type of modulation is used for signal generation in al synthesizers, such as the Yamaha DX7 to implement FM synthesis. and the other can be represented by a cosine wave (i.e. 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. Amplitude Shift Keying (ASK) is a type of Amplitude Modulation which represents the binary data in the form of variations in the amplitude of a signal. Note Figure 5.18 Frequency modulation Figure 5.19 FM band allocation Figure 5.20 Phase modulation The total bandwidth required for PM can be determined from the bandwidth and maximum amplitude of the modulating signal: BPM = 2(1 + β)B. - The modulation scheme needs to be cost efficient • Circuitry should be simple to implement and inexpensive (e.g. Spread spectrum method. Search: Analog Frequency Modulation Circuit. . The information signal . The advantage is higher data rate: if we maintain the same symbol period . Avg rating:5.0/5.0. Amplitude Modulation And Demodulation Lab Report. The information signal is then converted to the required format. At the receiver, the information signal is separated from the carrier. On the other hand, the constellation points of higher order QAM lie further . And the effective utilization of channel bandwidth is not up to the level. To investigate amplitude modulated signal in the time domain and the frequency domain. Phase detector ( phase comparator): It is a mixer (multiplier) followed by a low pass filter. 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 . Digital modulation. 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. What is demodulation? 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) … And we have to assume that there will be phase differences (unless the receiver incorporates carrier-recovery circuitry). The design of the modulator and the demodulator is simple. When the modulation index is very small, it is usually called narrow band FM (NBFM). The output voltage of the PD . Phase detector ( phase comparator): It is a mixer (multiplier) followed by a low pass filter. Demodulation of FM Signal Slide 13 Slide 14 Slide 15 Slide 16 Phase-Locked Loop (PLL) - negative feedback. It improves the strength of the signal without disturbing the parameters of the original signal. P t = P U S B = P L S B. SSB Demodulator Using a Hilbert Transform (cont.) 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). Mechanism of Modulations. In AM, there is a modulating signal. detection, amplifiers) • Given any modulation scheme, it is possible to obtain its signal constellation. The resulting transmitted single for one bit time is. Modulation enables the transfer of information on an electrical signal to a receiving device that demodulates the signal to extract the blended . [ 2 π ( f c − f m) t] for the lower sideband. P = v r m s 2 R = ( v m / 2) 2 R. In this case, the power of the upper sideband is. 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 5.0 (1) 474 Downloads. This demodulator requires taking a Hilbert transform but does not require filtering out terms at twice the carrier frequency. • In practice, synchronization is achieved using a phase-locked loop (PLL). Amplitude Modulation Amplitude Modulation Amplitude Modulation is a process where the amplitude of a carrier signal is altered according to information in a message signal. The quality is moderate. Instantaneous power of PPM modulated signal remains constant due to constant pulse widths and pulse amplitudes. - The block diagram of PLL: PLL Components 1. Vectors and modulation CSE 466 Interfacing 3 S'pose m and n are orthogonal unit vectors. 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(2πf 1t) 2sin(2πf 1t) Lowpass i r(t) Lowpass q r(t) i t q t 2cos .

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