Ppt on quadrature amplitude modulation

The Origin of Modems. Modems The word "modem" is a contraction of the words modulator-demodulator. A modem is typically used to send digital data over.

modems, modem designers had to use techniques far more sophisticated than frequency- shift keying. First they moved to phase-shift keying (PSK), and then quadrature amplitude modulation (QAM). First they moved to phase-shift keying (PSK), and then quadrature amplitude modulation (QAM). These techniques allow an incredible amount of information to be crammed into the 3,000 hertz of bandwidth available on a normal voice-grade/


More on Propagation Module B Copyright 2003 Prentice Hall Panko’s Business Data Networks and Telecommunications, 4 th edition.

Copyright 2003 Prentice Hall Panko’s Business Data Networks and Telecommunications, 4 th edition Modulation 3 Modulation converts an digital computer signal into a form that can travel down an ordinary analog telephone line There are several forms of modulation Amplitude modulation Frequency modulation Phase modulation Quadrature amplitude modulation (QAM), which combines amplitude and phase modulation 4 Waves Frequency of a wave The number of complete cycles per second Called Hertz kHz/


1 Modulation and Multiplexing Joe Montana IT 488 - Fall 2003.

) Change in Frequency: Frequency-Shift-Keying (FSK) Change in Phase: Phase-Shift-Keying (PSK) Hybrid changes (more than one parameter). Ex. Phase and Amplitude change: Quadrature Amplitude Modulation (QAM) 55 Binary Modulations – Basic Types These two have constant envelope (important for amplitude sensitive channels) 56 Coherent and Non-coherent Detection Coherent Detection (most PSK, some FSK): Exact replicas of the possible arriving signals are available at/


Amateur Extra Licensing Class Lake Area Radio Klub Spring 2012 Modulate Your Transmitters.

C.Two or more data streams share the same channel by transmitting time of transmission as the sub-carrier D.Two or more signals are quadrature modulated to increase bandwidth efficiency E8D01 What is the easiest voltage amplitude parameter to measure when viewing a pure sine wave signal on an oscilloscope? A.Peak-to-peak voltage B.RMS voltage C.Average voltage D/


© 2009 Pearson Education, Inc. Publishing as Prentice Hall More on Modulation Module B Updated January 2009 Raymond Panko’s Business Data Networks and.

of modulationAmplitude modulation –Frequency modulation –Phase modulationQuadrature amplitude modulation (QAM), which combines amplitude and phase modulation © 2009 Pearson Education, Inc. Publishing as Prentice Hall B-5 Amplitude Modulation (AM) Amplitude is the intensity of the signal –Loud or soft Amplitude (power) © 2009 Pearson Education, Inc. Publishing as Prentice Hall B-6 Amplitude Modulation (AM) Low Amplitude (0) High Amplitude (1) Amplitude Modulation (1011) Amplitude (low) Amplitude (high/


Chapter 6 – Modulation Techniques for Mobile Radio

(in Hz/V) - defines amount magnitude of allowable frequency change carrier (a) Carrier wave. (b) Sinusoidal modulating signal. (c) Amplitude-modulated signal. (d) Frequency-modulated signal. FM signal spectrum → carrier + Message signal frequency # of sidebands So FM signal spectrum → carrier + / hence both signals occupy the same bandwidth π/4 QPSK π/4 QPSK The π/4 shifted QPSK modulation is a quadrature phase shift keying technique offers a compromise between OQPSK and QPSK in terms of the allowed maximum /


Quiz #1 What is the difference between channel coding, modulation, and source coding? Draw a block diagram showing the order in which the following happens:

receiver x(t) cos(2pfct) +A Baseband signal discernable after smoothing T 2T 3T 4T 5T 6T -A Recovered Information 1 Quadrature Amplitude Modulation (QAM) QAM uses two-dimensional signaling Ak modulates in-phase cos(2pfct) Bk modulates quadrature phase sin(2pfct) Transmit sum of inphase & quadrature phase components x Ak Yi(t) = Ak cos(2fct) cos(2fct) + Y(t) Transmitted Signal x Bk Yq/


Unit 2 Modulation And Multiplexing

diagram shows us the __________ of a signal element, particularly when we are using two carriers (one in-phase and one quadrature). A) amplitude and phase B) amplitude and frequency C) frequency and phase D) none of the above Answer-A 16. Quadrature amplitude modulation (QAM) is a combination of ___________. A) ASK and FSK B) ASK and PSK C) PSK and FSK D) none of/


Mobile Communications Chapter 2: Wireless Transmission  Frequencies  Signals  Antenna  Signal propagation  Multiplexing  Spread spectrum  Modulation.

Often also transmission of relative, not absolute phase shift: DQPSK - Differential QPSK (IS-136, PHS) 111000 01 Q I 01 Q I 11 01 10 00 A t Quadrature Amplitude Modulation Quadrature Amplitude Modulation (QAM): combines amplitude and phase modulation  it is possible to code n bits using one symbol  2 n discrete levels, n=2 identical to QPSK  bit error rate increases with n, but less errors/


Mobile Communications Chapter 2: Wireless Transmission  Frequencies  Signals  Antenna  Signal propagation  Multiplexing  Spread spectrum  Modulation.

Often also transmission of relative, not absolute phase shift: DQPSK - Differential QPSK (IS-136, PHS) 111000 01 Q I 01 Q I 11 01 10 00 A t Quadrature Amplitude Modulation Quadrature Amplitude Modulation (QAM): combines amplitude and phase modulation  it is possible to code n bits using one symbol  2 n discrete levels, n=2 identical to QPSK  bit error rate increases with n, but less errors/


1.  1.introduction › Signal space representation of signals. › Signal space model of digital communication system. › Different modulation schemes. ›

each mod scheme.  2-Binary modulation techniques  3-quadrature modulation techniques  4-M-ary modulation techniques  5-comparing different scheme › Power spectra. › Probability of error. › Bandwidth efficiency.  6-bit vs. symbol error probabilities  7-applications 2 3 4 Why modulate? Antenna’s length Multiplexing Main idea: shifting(keying) the amplitude/frequency/phase of a high frequency carrier.  Modulator: › In digital communication :  modulating wave :binary data/M-ary encoded/


Computer Communication & Networks Lecture # 16. Today’s Menu ϞModulation/Demodulation ϞAmplitude Modulation ϞFrequency Modulation ϞPhase Modulation ϞQuadrature.

can use it to represent digital data ϞExample: using internet over the telephone line Modulation There are three characteristics of a sine wave, so we can change each of them to modulate a signal ϞAmplitude Modulation ϞFrequency Modulation ϞPhase Modulation We can also combine them to get another method knows as QAM Quadrature Amplitude Modulation Bit Rate VS Baud Rate Bit rate Number of bits transmitted during one second/


Mobile Communications Wireless Transmission Chapter 2  Frequencies  Signals  Antenna  Signal propagation  Multiplexing  Spread spectrum  Modulation.

also transmission of relative, not absolute phase shift: DQPSK - Differential QPSK (IS-136, PACS, PHS) 111000 01 Q I 01 Q I 11 01 10 00 A t Quadrature Amplitude Modulation Quadrature Amplitude Modulation (QAM): combines amplitude and phase modulation  it is possible to code n bits using one symbol  2 n discrete levels, n=2 identical to QPSK  bit error rate increases with n, but less errors/


COMMUNICATIONS EE 733.

demodulation must be de-emphasized by a filter with similar characteristics as the pre-emphasis filter to restore the relative amplitudes of the modulating signal. H. Chan, Mohawk College FM Stereo Broadcasting: Baseband Spectra To maintain compatibility with monaural system, FM / FM receivers. Phase Detector Demodulated output FM IF Signal f LPF VCO H. Chan, Mohawk College Quadrature Detector Both the quadrature and the PLL detector are conveniently found as IC packages. H. Chan, Mohawk College Radio-Wave /


EE445S Real-Time Digital Signal Processing Lab Spring 2014 Lecture 15 Quadrature Amplitude Modulation (QAM) Transmitter Prof. Brian L. Evans Dept. of Electrical.

EE445S Real-Time Digital Signal Processing Lab Spring 2014 Lecture 15 Quadrature Amplitude Modulation (QAM) Transmitter Prof. Brian L. Evans Dept. of Electrical and Computer Engineering The University of Texas at Austin 15 - 2 Introduction Digital Pulse Amplitude Modulation (PAM) Modulates digital information onto amplitude of pulse May be later upconverted (e.g. to radio frequency) Digital Quadrature Amplitude Modulation (QAM) Two-dimensional extension of digital PAM Baseband signal requires sinusoidal/


CI Lecture Series Summer 2010 An Overview of IQ Modulation and Demodulation Techniques for Cavity LLRF Control.

90 degrees out of phase signal. Block Diagram of an IQ modulator VQVQ ө A 1 1 VIVI I Q CI Lecture Series Summer 2010 Effect of quadrature phase error and amplitude offset on sidebands Vector Mod ADL5375 from Analog Devices. Typical Gain/Amplitude error of a Vector Modulator Courtesy: Hittite Microwaves IQ Gain imbalance error is due to inconsistencies between two mixers and imperfect 90/


Chapter Three: Amplitude Modulation. Introduction Amplitude Modulation is the simplest and earliest form of transmitters AM applications include broadcasting.

Amplitude Modulation The information signal varies the instantaneous amplitude of the carrier AM Characteristics AM is a nonlinear process Sum and difference frequencies are created that carry the information Full-Carrier AM: Time Domain Modulation Index - The ratio between the amplitudes between the amplitudes of the modulating/ is known as Quadrature AM (QUAM or QAM) Recovery of the two signals is accomplished by synchronous detection by two balanced modulators Quadrature Operation Suppressed-Carrier AM/


1 A 56 – 65 GHz Injection-Locked Frequency Tripler With Quadrature Outputs in 90-nm CMOS Chan, W.L.; Long, J.R.; Solid-State Circuits, IEEE Journal of.

co-integration.  Single-sideband modulation or demodulation in a mm-wave transceiver requires a mm-wave local oscillator (LO) with quadrature outputs. 7 INTRODUCTION (Cont.)  A phase and amplitude tuning mechanism with about 5 and/ ’ s free running frequency is preferred.  Moreover, a two-stage ring oscillator readily produces quadrature signals, which are required for advanced modulation and demodulation schemes. 21 FREQUENCY TRIPLER ARCHITECTURE & DESIGN  Block diagram of the proposed tripler. 22/


Coding No. 1  Seattle Pacific University Modulation Kevin Bolding Electrical Engineering Seattle Pacific University.

frequencies >f 0 1 2 3 4 6 7 8 9 10 11 12 13 14 15 5 Pulse-Amplitude Modulation – PAM Samples have analog (infinite precision) values Undersampling If sample rate is < 2f then it is possible to map/phase angles, 0 and  Two possibilities for symbol  One bit per symbol If we use more phase angles, we can send more data per symbol Quadrature (or Quaternary) PSK QPSK uses angles  Four possibilities for symbol  Two bits per symbol    BPSK     QPSK  /


EE345S Real-Time Digital Signal Processing Lab Fall 2006 Lecture 15 Quadrature Amplitude Modulation (QAM) Transmitter Prof. Brian L. Evans Dept. of Electrical.

Austin 15 - 2 Introduction Digital Pulse Amplitude Modulation (PAM) modulates digital information onto amplitude of pulse and may be later modulated by sinusoid Digital Quadrature Amplitude Modulation (QAM) is two-dimensional extension of digital PAM that requires sinusoidal modulation Digital QAM modulates digital information onto pulses that are modulated onto Amplitudes of a sine and a cosine, or equivalently Amplitude and phase of single sinusoid 15 - 3 Amplitude Modulation by Cosine Example: y(t) = f/


05 - Winter 2005 ECE ECE 766 Computer Interfacing and Protocols 1 Modulation Conversion of digital information to analog signals –Example: Telephone lines.

ECE 766 Computer Interfacing and Protocols 2 Modulation Modulation Techniques –Amplitude Shift Keying (ASK) –Frequency Shift Keying (FSK) –Phase Shift Keying (PSK) Aspects of Modulation –Bit rate vs. Baud rate Bit rate ≥ Baud rate –Carrier Signal Quadrature Amplitude Modulation (QAM) 05 - Winter 2005 ECE ECE 766 Computer Interfacing and Protocols 3 Amplitude Shift Keying (ASK) Basic technique (like AM)  change the amplitude of the signal to transfer logical values/


Lecture 11 Outline: Digital Modulation Announcements: Jeremy will cover my 11:30-12:30 OHs today Homework 3 due today 5pm, HW 4 posted tonight Reading:

Broadcast AM demodulator uses an envelope detector No need to recover phase  very simple receiver design Quadrature modulation sends independent AM signals modulated onto the sin and cosine carriers FM encodes information in frequency of carrier (optional topic) LSB USB/block diagram includes compression, error-correction coding and modulation Digital baseband modulation encodes bits in analog signal Digital passband modulation encodes binary bits into the amplitude or phase of the carrier. ASK/PSK /


DIGITAL MODULATIONS. ©2000 Bijan Mobasseri2 Why digital modulation? l If our goal was to design a digital baseband communication system. We have done.

probability is approximately given by ©2000 Bijan Mobasseri91 Quadrature Amplitude Modulation (QAM) l MPSK was a phase modulation scheme. All amplitudes are the same l QAM is described by a constellation consisting of combination of phase and amplitudes l The rule governing bits-to-symbols are / bps ©2000 Bijan Mobasseri98 M-ary FSK l Using M tones, instead of M phases/amplitudes is a fundamentally different way of M-ary modulation l The idea is to use M RF pulses. The frequencies chosen must be orthogonal ©/


5 - 1 Texas Instruments Incorporated Module 5 : Event Manager C28x 32-Bit-Digital Signal Controller TMS320F2812.

pulses  fixed carrier frequency  fixed pulse amplitude  pulse width proportional to instantaneous signal amplitude  PWM energy  original signal energy  Differs from PAM (Pulse Amplitude Modulation)  fixed width, variable amplitude 5 - 24 T t PWM representation PAM / estimate errors Alternative: Estimate the speed using a measured time interval at fixed position intervals Signal from one Quadrature Encoder Channel  Low speed velocity estimation from incr. encoder:  Measure the time width of a pulse/


Modulation Techniques for Mobile Radio

. CS 515 © Ibrahim Korpeoglu Amplitude Modulation The amplitude of high-carrier signal is varied according to the instantaneous amplitude of the modulating message signal m(t). AM Modulator m(t) sAM(t) CS 515 © Ibrahim Korpeoglu Modulation Index of AM Signal For a/ 1 0 1 0 1 Data Carrier Carrier+ p BPSK waveform CS 515 © Ibrahim Korpeoglu Quadrature Phase Shift Keying Multilevel Modulation Technique: 2 bits per symbol More spectrally efficient, more complex receiver. Two times more bandwidth efficient/


Sistemi di radiocomunicazione 1 SISTEMI DI RADIOCOMUNICAZIONE DATA TRANSMISSION BY ORTHOGONAL FREQUENCY DIVIVSION MULTIPLEXING MODULATION Prof. C. Regazzoni.

function of the average energyof the constellation. OFDM: performances on AWGN channel (in-phase component) (in-quadrature component) Sistemi di radiocomunicazione 24 OFDM: performances on AWGN channel Practically the error probability of an OFDM system/ 25 OFDM: performances with pulse noise The OFDM modulation offers remarkable robustness properties against impulsive noises, where impulsive noise is defined as a rectangular pulse with limited amplitude and duration (generally inferior than the symbol time/


Signals and Emissions 1 G8 - SIGNALS AND EMISSIONS [2 exam questions - 2 groups] G8A - Carriers and modulation: AM; FM; single and double sideband; modulation.

modulation B. Phase modulation C. Amplitude modulation D. Pulse modulation G8A04 What emission is produced by a reactance modulator connected to an RF power amplifier? A. Multiplex modulation B. Phase modulation C. Amplitude modulation D. Pulse modulation G8A05 What type of modulation varies the instantaneous power level of the RF signal? A. Frequency shift keying B. Pulse position modulation C. Frequency modulation D. Amplitude modulation G8A05 What type of modulation/ receiver? A. Quadrature noise B. Image/


Chapter 5 – Signal Encoding and Modulation Techniques

M decreases BER and decreases bandwidth Efficiency MPSK: Increasing M increases BER and increases bandwidth efficiency 42/45 Quadrature Amplitude Modulation (QAM) QAM used on asymmetric digital subscriber line (ADSL) and some wireless standards combination of ASK and/carrier frequency use two copies of carrier, one shifted by 90° each carrier is ASK modulated Quadrature amplitude modulation (QAM) is a popular analog signaling technique that is used in the asymmetric digital subscriber line (ADSL),/


Performance Evaluation of DPSK Optical Fiber Communication Systems Jin Wang April 22, 2004 DPSK: Differential Phase-Shift Keying, a modulation technique.

DPSK. Optical Filter Elec. Filter Photodetector Decoder Optical signal Bits Information Bits Laser Modulator Optical signal Encoder Symbols 5 Modulation Formats One or more field properties can be modulated to carry information. Example:  On-off keying (OOK): binary amplitude modulation  Binary DPSK, Quadrature DPSK : phase modulationQuadrature Amplitude Modulation (QAM): amplitude and phase modulation Amplitude Polarization PhaseFrequency Electric field of optical carrier: E(t) = êAexp(j  t+  6/


Wireless Networking Spread Spectrum Technologies Module-05

shift keying (FSK) Phase shift keying (PSK) CWNA Guide to Wireless LANs, Second EditionCCRI J. Bernardini Quadrature phase shift keying (QPSK) CWNA Guide to Wireless LANs, Second Edition 16-QAM Modulation CWNA Guide to Wireless LANs, Second Edition 64-QAM - 64-level Quadrature Amplitude Modulation CWNA Guide to Wireless LANs, Second Edition Max Total Service Area Data Rate Summary PHY Data Rates Frequency Band Standards/


Modulation Technique. Digital Modulation Basics Figures of Merit:  Power efficiency.  Spectrum / BW efficiency.  Complexity.  Robustness against impairment,

receiver for the AWGN channel Now Mobile radio —— Optimum receiver for the AWGN channel Placement of thresholds at mid-points of successive amplitude levels.Consider M=4. Mobile radio —— Optimum receiver for the AWGN channel Given that the m-th symbol is transmitted, the / easy process. Using a programmable read only memory(PROM) or a high speed DSP, the generation of an MSK waveform in their quadrature modulation format, I(t)cosω c t and Q(t)sinω c t is very easy. Mobile radio —— Minimum Shift Keying (/


1 UNIT - III WIRELESS TRANSCEIVERS Unit Syllabus – Structure of a Wireless Communication Link – Modulation QPSK π/4 - DQPSK OQPSK BFSK MSK GMSK – Demodulation.

.5) Complex representationSignal space diagram 28 Binary amplitude modulation (BAM) Raised-cosine pulses (roll-off 0.5) Power spectral density for BAM Normalized freq. fiT b 29 Quaternary PSK (QPSK or 4-PSK) Rectangular pulses Complex representation Radio signal 30 Quaternary PSK (QPSK or 4-PSK) Rectangular pulses Power spectral density for QPSK 31 Quadrature ampl.-modulation (QAM) Root raised-cos pulses (roll-off/


An Embedded System to Correct In-Phase and Quadrature- Phase Imbalance for WCDMA Direct Conversion Receiver Ye Shi Helsinkin University of Technology Supervisor:Professor.

amplitude imbalance is indicated when the constellation is not "square," i.e., when the Q-axis height does not equal the I-axis width, as seen in the Figure. Most Common I/Q Imbalances-2 Quadrature error If the phase shift between the RF LO signals that mix with the I and Q base band signal at the modulator/I/Q Imbalances (1) Developing a mathematical model to estimate Amplitude imbalance Phase imbalance between the I/Q branches Quadrature error Delay Implementing the algorithm in PowerPC processor Get the /


REFERENCES CCRI Engineering and Technology Jbernardini 1 Introduction to Wireless Networking Module-5 Physical Layer Access Methods and Spread Spectrum.

phase shift keying (QPSK) CCRI Engineering and Technology Jbernardini 47 REFERENCES CCRI Engineering and Technology Jbernardini 48 16-QAM Modulation CCRI Engineering and Technology Jbernardini 48 REFERENCES CCRI Engineering and Technology Jbernardini 49 64-QAM - 64-level Quadrature Amplitude Modulation CCRI Engineering and Technology Jbernardini 49 REFERENCES CCRI Engineering and Technology Jbernardini 50 Spread Spectrum Comparisons CCRI Engineering and Technology Jbernardini 50 PHYData RatesFrequency/


July, 19982 - 1RF100 (c) 1998 Scott Baxter Wireless Systems: Modulation Schemes and Bandwidth Wireless Systems: Modulation Schemes and Bandwidth RF100.

Frequency Shift Keying AMPS control channels MSK Minimum Shift Keying GMSK Gaussian Minimum Shift Keying GSM systems, CDPD nHybrid Combinations of Linear and Constant Envelope Modulation MPSK M-ary Phase Shift Keying QAM M-ary Quadrature Amplitude Modulation MFSK M-ary Frequency Shift Keying FLEX paging protocol nSpread Spectrum Multiple Access Techniques DSSS Direct-Sequence Spread Spectrum IS-95 CDMA FHSS Frequency-Hopping Spread/


27/4/00 p. 1 Postacademic Course on Telecommunications Module-3 Transmission Marc Moonen Lecture-3 Transmitter Design K.U.Leuven/ESAT-SISTA Module-3 :

(see e.g. Lee & Messerschmitt, Chapter 16). Postacademic Course on Telecommunications 27/4/00 p. 15 Module-3 Transmission Marc Moonen Lecture-3 Transmitter Design K.U.Leuven-ESAT/SISTA Constellations for linear modulation (I) Transmitted signal (envelope) is: Constellations: PAM PSK QAM pulse amplitude modulation phase-shift keying quadrature amplitude modulation 4-PAM (2bits) 8-PSK (3bits) 16-QAM (4bits) ps: complex constellations for passband transmission/


Chapter 4 4.1 : Digital Modulation 4.2 : Digital Transmission 4.3 : Multiple Access Methods.

encoded into each signaling element. For B necessary to pass M-ary digitally modulated carriers Amplitude Shift Keying (ASK) Frequency Shift Keying (FSK) Phase Shift Keying (PSK) Quadrature Amplitude Modulation (QAM) Amplitude Shift Keying (ASK) A binary information signal directly modulates the amplitude of an analog carrier. Sometimes called Digital Amplitude Modulation (DAM) Where v ask (t) = amplitude shift keying wave v m (t) = digital information signal (volt) A/2 = unmodulated/


1 An Najah National University Telecommunication Engineering Department Digital Communications 69342 Digital Modulation Dr. Allam Mousa Sec3_Dig_Modu.

that have more than two output conditions ( symbols) must be used. 6Sec3_Dig_Modu Digital Amplitude Modulation For AM V(t) = A/2 [1+ m(t)] cos ( 2* pi * fc*t). modulating signal carrier signal Let m(t)=+1 (binary) on – off-keying. (Acos(/table and constellation Find a block diagram for 16 PSK 59Sec3_Dig_Modu Quadratur Amplitude Modulation (QAM) Information is contained to both the amplitude & phase of the transmitted carrier. Output of 8-QAM (Not a constant –amplitude signal ) 8 –QAM Tx is so similar to the /


CHAPTER 4. OUTLINES 1. Digital Modulation Introduction Information capacity, Bits, Bit Rate, Baud, M- ary encoding ASK, FSK, PSK, QPSK, QAM 2. Digital.

the phase, θ of the carrier are varied proportional to the information signal, a digital modulated signal is called Quadrature Amplitude Modulation (QAM) Cont’d… Simplified block diagram of a digital modulation system Cont’d… Precoder performs level conversion & encodes incoming data into group of bits that modulate an analog carrier. Modulated carrier filtered, amplified & transmitted through transmission medium to Rx. In Rx, the incoming signals filtered, amplified/


Chapter Twelve: Digital Modulation and Modems. Introduction Most systems use analog carriers but digital modulation RF (sine wave) carriers are used Carrier.

Bell Modems Bell 202 –Used for call display –Simplex Bell 103 –300 baud –Full duplex Bell 212A –PSK –1200 bps QAM - Quadrature Amplitude Modulation Increase the number of bits/symbol Combination of amplitude and phase modulation A constellation diagram shows all signal states Connection quality determines data rate 56K Modem Dial-up Signal passes through the BORSCHT codec FCC limitation is 54 kb/s (downstream/


C H A P T E R 4 AMPLITUDE MODULATIONS AND DEMODULATIONS

message spectrum and (b) the redundant bandwidth consumption in DSB modulations. To Improve the spectral efficiency of AM Single-side (SSB) modulation Remove either LSB or USB Quadrature amplitude modulation (QAM) Sending two messages over the same bandwidth of 2B Hz. Fundamental of Communication Systems ELCT332 FALL2011 14 SSB spectra from suppressing one DSB sideband. Amplitude Modulation: Single Sideband (SSB) Bandpass filtering SSB spectra from suppressing one/


Maui Akamai Internship

and negative drawbacks associated with them. In the case of this amplifier, I observed that the phase shift keying modulators performed better. (read slide) Future Goals Design and build demodulators Obtain quantitative results Bit error rate Design more “complex” modulators Quadrature Amplitude Modulators Differential Phase Shift Keying Modulators Incorporate encoders and decoders to communication system (read slide) Acknowledgements Hien Do, Ned Davis, Daron Nishimoto Lynne Raschke/


1 Design and Implementation of GPS Receiver (Module 6) In current competitive environment, with product life cycles measured in months, getting it right.

at the right most part of the figure. The two modulated codes are combined resulting in a complete GPS signal. The two components are added together as in-phase and quadrature components of the final signal. The last part is the /more detailed description of the input signal. The following figure shows the first 100 samples of the signal sampled with an amplitude resolution of 8 bits. 25 Acquisition Algorithms Three algorithms may be described: –Serial search acquisition –Parallel frequency space search /


5.1 Background Information Modulation Techniques (Chapter 5) Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

amplitude of the modulating signal: B PM = 2(1 + β)B. Note 5.14 Digital Modulation Digital modulation is used to generate analog signals from information bit streams Digital modulation types Amplitude Shift Keying Frequency Shift Keying Phase Shift Keying Quadrature Amplitude Modulation 5.15 Digital modulation/12 Concept of a constellation diagram 5.26 Figure 5.13 Three constellation diagrams 5.27 Quadrature amplitude modulation is a combination of ASK and PSK. Note 5.28 Figure 5.14 Constellation diagrams /


CNU Dept. of Electronics D. J. Kim1 Lecture on Communication Theory Chapter 3. Continuous-wave modulation 3.1 Introduction modulation:the process by which.

0 CNU Dept. of Electronics D. J. Kim16 Lecture on Communication Theory 5. Quadrature-Carrier Multiplexing or QAM In-phase Quadrature CNU Dept. of Electronics D. J. Kim17 Lecture on Communication Theory Key points> /in FM system 1. Nonlinearties 1) Strong nonlinearity : square-law modulators, limiters, frequency multiplier 2) Weak nonlinearity : due to imperfections. 2. Weak Nonlinearity 의 경우 ( 결론 ) FM 은 Channel 로 전송 중 생기는 Amplitude Nonlinearity 에 의한 영향이 없다.  Microwave radio, satellite communication system /


Amplitude modulation (AM) radio is a commonplace technology today, and is standard in any type of commercial stereo device. Because of the low cost.

low cost of the parts necessary to implement AM transmission and the simplicity of the underlying technology, using amplitude modulations is a cheap and effective way to perform many tasks that require wireless communication.  The most well/discriminator method) SSB modulator using the frequency discrimination approach Magnitude spectra : (a) baseband ; (b) DSBSC-AM; (c) upper SSB; (d) lower SSB  Quadrature modulator can be used to create a SSB-AM signal by selecting the quadrature signal to coherently /


Chapter 2 Data Communication Concepts Code Transmission Signal Modulation Service.

position of wave measured in degree –A shift of departure from normal continuous pattern of the wave Modems Modulation and Demodulation Analog lines to transmit digital signals Methods –Amplitude modulation (AM) –Frequency modulation (FM) –Phase modulation (PM) –Quadrature amplitude modulation (QAM) Modulation Amplitude modulation (AM) –Height of the signals –Susceptible to noise and interference Frequency modulation (FM) –Frequency shift keying (FSK) –Width of the signals –Less interference than AM Phase/


Digital Communications I: Modulation and Coding Course Spring - 2013 Jeffrey N. Denenberg Lecture 4: BandPass Modulation/Demodulation.

at the receiver for carrier phase estimation ( ). PLL Oscillator 90 deg. Used by correlators I branch Q branch Lecture 79 Bandpass Modulation Schemes One dimensional waveforms Amplitude Shift Keying (ASK)‏ M-ary Pulse Amplitude Modulation (M-PAM)‏ Two dimensional waveforms M-ary Phase Shift Keying (M-PSK)‏ M-ary Quadrature Amplitude Modulation (M-QAM)‏ Multidimensional waveforms M-ary Frequency Shift Keying (M-FSK) Lecture 710 One dimensional/


DIGITAL MODULATION. Digital-to-analog modulation (Digital-to-analog modulation)

the bandwidth, which means the baud rate is 5000. But in 8-PSK the bit rate is 3 times the baud rate, so the bit rate is 15,000 bps. Quadrature amplitude modulation is a combination of ASK and PSK so that a maximum contrast between each signal unit (bit, dibit, tribit, and so on) is achieved. What is the QAM ? The 4/


Lecture 71 Today, we are going to talk about: Some bandpass modulation schemes used in DCS for transmitting information over channel M-PAM, M-PSK, M-FSK,

oscillators at the receiver which generate the carrier signal, are not usually phased locked to the transmitted carrier. Lecture 76 Bandpass Modulation Schemes One dimensional waveforms Amplitude Shift Keying (ASK)‏ M-ary Pulse Amplitude Modulation (M-PAM)‏ Two dimensional waveforms M-ary Phase Shift Keying (M-PSK)‏ M-ary Quadrature Amplitude Modulation (M-QAM)‏ Multidimensional waveforms M-ary Frequency Shift Keying (M-FSK) Lecture 77 One dimensional/


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