modulation and demodulation slideshare

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.

modulation and demodulation slideshare

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