 # modulation and demodulation slideshare

Basics of Modulation and Demodulation Microwaves amp RF. QPSK is a modulation scheme that allows one symbol to transfer two bits of data. This is regarded as the most robust digital modulation technique and is used for long . The two modulated carrier signals are transmitted together at the source and at the destination, these two carrier signals are demodulated (i.e . stage 1 EE4512 Analog and Digital Communications Chapter 5 Chapter 5 Digital Bandpass Modulation and Demodulation Techniques Binary Amplitude Shift Keying Pages 212-219 Instantaneous power of PPM modulated signal remains constant due to constant pulse widths and pulse amplitudes. Mechanism of Modulations. 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. 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. 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

The following figure represents ASK modulated waveform along with its . 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). An over-sampled input is taken to make full use of the signal correlation. - The block diagram of PLL: PLL Components 1. ).. 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 . Tektronix PG501A 2MHz Function Generator 3. '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 quantization design is simple. The m-file pre6_2.m is a function file for this procedure. Slides: 20 Download presentation MODULATION AND DEMODULATION What is modulation? Equipments 1.

To investigate amplitude modulated signal in the time domain and the frequency domain. Power of SSBSC wave is equal to the power of any one sideband frequency components. Consider for example a sinusoidal carrier signal. It means we can give only one input signal and we can modulate it and transmit to the destination level. 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) BPSK demodulation Demodulation of a BPSK signal can be considered a two-stage process. Following are some of the features of delta modulation. Vectors and modulation CSE 466 Interfacing 3 S'pose m and n are orthogonal unit vectors. LinkedIn SlideShare. Amplitude Modulation. p. 5 ELEC 7073 Digital Communications III, Dept. S (t) =A *cos (2*pi*fc*t+pi) for binary 0. Amplitude Modulation ppt SlideShare. Synchronous Demodulation of Sinusoidal AM Assumptions: = 0 (for now), Local oscillator is synchronized with the carrier. What is demodulation? Amplitude Modulation And Demodulation Lab Report. Therefore, Analog modulation includes AM, FM and PM and these are more sensitive to noise. Modulation, demodulation and detection (baseband and passband) - Chapters 2, 3 and 4 in Sklar. Objectives 1. If noise enters into a system, it persists and gets carried up to the end receiver. 50 - D1 ASK - amplitude shift keying ASK - AMPLITUDE SHIFT KEYING ACHIEVEMENTS: generation and demodulation of an amplitude shift keyed (ASK) signal. In the amplitude modulation scheme, we can modulate one message signal (input signal) which is in analog form. To convert the containing time signal into discreet time signal, a process is used called sampling. Though modulation can occur in a number of ways. Channel coding (Block codes and Convolutional codes) - Chapters 6, 7, and 8 in Sklar. Analog Communication - Modulation. - The block diagram of PLL: PLL Components 1. Definition: Single sideband modulation (SSB) is an amplitude modulation scheme in which only a single sideband is transmitted through the channel. 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. 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 . 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. SSB Demodulator Using a Hilbert Transform (cont.) So, these can be overcome by this QAM technique. In AM, there is a modulating signal. 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. [ 2 ( f c f m) t] for the lower sideband. Modulation enables the transfer of information on an electrical signal to a receiving device that demodulates the signal to extract the blended . 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 Search: Analog Frequency Modulation Circuit. One signal is called the in-phase "I" signal, and the other is called the quadrature "Q" signal. Amplitude Modulation and Demodulation I. Broadcast FM signals are filtered by a band-pass filter prior to transmitting. It is also known as SSB-SC which is an acronym for Single Sideband Suppressed Carrier as it allows suppression of one sideband and carrier completely.. As we know, DSB-SC modulation technique generates an output wave having twice the bandwidth as . Any modulated signal has a high frequency carrier. 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,

To achieve this it is necessary to change the frequency of the signal for a short time. 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. EXTRA MODULES: DECISION MAKER PREPARATION generation Amplitude shift keying - ASK - in the context of . The binary signal when ASK modulated, gives a zero value for Low input while it gives the carrier output for High input.. Mathematically, one of the carrier signals can be represented by a sine wave (i.e. ) When the modulation index is very small, it is usually called narrow band FM (NBFM). VSB modulation represents a compromise between SSB and DSB modulation systems. Connect the demodulated pam waves, and note simultaneously by varying . Description: Calculate the AM voltage distribution, modulation index, voltage ,power . License. Types of Analog Modulation. 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 + )B. The input sequence is much higher than Nyquist rate. '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 . of E.E.E., HKU Digital 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. The quality is moderate. Phase Modulation Theory Time Domain Frequency Domain. Illustrating the modulation steps in an FDM system AM Broadcasting History Frequency Long wave 153-270kHz Medium wave 520-1710kHz AM radio. In practice, synchronization is achieved using a phase-locked loop (PLL). Prelab 6.2 Narrow band and Wide band Modulation FM can be categorized to narrow band and wideband. Following are the benefits or advantages of PPM: Noise interference is less or minimum due to constant amplitude. Demodulation of FM Signal Slide 13 Slide 14 Slide 15 Slide 16 Phase-Locked Loop (PLL) - negative feedback. PREREQUISITES: it would be advantageous to have completed some of the experiments in Volume A1 involving linear modulation and demodulation. - Represent each possible signal as a vector in a Euclidean space spanned by an orthonormalbasis. This type of modulation is used for signal generation in al synthesizers, such as the Yamaha DX7 to implement FM synthesis. 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. This is a low-frequency signal as we have seen earlier.

2. Vestigial Sideband (VSB) Modulation and Demodulation [Urdu] In this lecture we cover Vestigial Sideband (VSB) which is trade of between single sideband (SSB) and double sideband (DSB). HAPTER Modulation and Demodulation. This demodulator requires taking a Hilbert transform but does not require ltering out terms at twice the carrier frequency. Where is usually 4. The Demodulated signals of the above noisy . . 50 - D1 ASK - amplitude shift keying ASK - AMPLITUDE SHIFT KEYING ACHIEVEMENTS: generation and demodulation of an amplitude shift keyed (ASK) signal. 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. Thus, there are a few primary modulation mechanisms that we mainly take into practical and usable categorization. II. The PLL consists of three basic components: A. Pulse amplitude modulation is the simplest form of modulation. 2 - Modulated FM signal is to pass it through a limiter. 3. - The modulation scheme needs to be cost efficient Circuitry should be simple to implement and inexpensive (e.g. Spread spectrum method. The resulting transmitted single for one bit time is. Toolbox; Zip . 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." Avg rating:5.0/5.0. This is also called an input signal or baseband signal (Speech for example). and the other can be represented by a cosine wave (i.e. On the other hand, the constellation points of higher order QAM lie further . As an analoggic sign is contained in time and amplitude, a digital signal . The simplest BPSK scheme uses two phases to represent the two binary digits and is known as binary phase-shift keying. For a signal to be transmitted to a distance, without the effect of any external interferences or noise addition and without getting faded away, it has to undergo a process called as Modulation. 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. It has highest power efficiency among all three types. 