Ppt on amplitude shift keying demodulation

EE682L: Lectures 2 and 3 1 Digital Communications Source Encoder Channel Encoder Digital Modulator Channel Digital Demodulator Channel Decoder Source Decoder.

Lectures 2 and 3 1 Digital Communications Source Encoder Channel Encoder Digital Modulator Channel Digital Demodulator Channel Decoder Source Decoder Sink EE682L: Lectures 2 and 3 2 Digital Comm Functional Blocks/EE682L: Lectures 2 and 3 17 Memoryless Modulation Quadrature Amplitude Modulation (QAM) EE682L: Lectures 2 and 3 18 QAM Special Cases Pulse Amplitude Modulation: use amplitude only –Example: EE682L: Lectures 2 and 3 19 QAM Special Cases Phase Shift Keying (PSK): use phase only –Example: BPSK EE682L:/


Communications Systems. 1Analogue modulation: time domain (waveforms), frequency domain (spectra), amplitude modulation (am), frequency modulation (fm),

(spectra), amplitude modulation (am), frequency modulation (fm), phase modulation (pm) 2Digital modulation: waveforms and spectra, Frequency Shift Keying (FSK), Binary Phase Shift Keying (BPSK) [including Gaussian Minimum Shift Keying (GMSK)], Quadrature Phase Shift Keying (QPSK)/ transducer. Other functions performed by the receiver: amplification (the received signal may be extremely weak), demodulation and filtering. Output Transducer: Converts the electric signal at its input into the form desired by the/


ECE 4730: Lecture #10 1 MRC Parameters  How do we characterize a time-varying MRC?  Statistical analyses must be used  Four Key Characteristics of a.

a time-varying MRC?  Statistical analyses must be used  Four Key Characteristics of a Mobile Radio Channel (MRC)  Time Dispersion Characteristics 1/: measure of spectral broadening of Tx signal caused by motion  i.e. Doppler shift  B D = max Doppler shift = f max = v max /  B D = 50-200 Hz) /Rayleigh fading”  Random amplitude fluctuations follow a Rayleigh PDF  Applies for flat fading channel only  Rayleigh PDF »  : RMS value of Rx signal before detection (demodulation) » Common model for/


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

DPSK: Differential Phase-Shift Keying, a modulation /carry information. Example:  On-off keying (OOK): binary amplitude modulation  Binary DPSK, Quadrature DPSK : phase modulation  Quadrature Amplitude Modulation (QAM): amplitude and phase modulation Amplitude Polarization PhaseFrequency Electric field of optical carrier:/ spectrum efficiency  Interferometric demodulation + direct detection  Data rates of 10 Gb/s and 40 Gb/s  relaxed linewidth requirements 7 On-Off Keying (OOK) Symbol constellation for/


Important Hardware Modems (amplitude and frequency Modulation)

signal so the signal can carry information on a communications media. There are three fundamental methods of analog modulation of an analog signal: Amplitude Modulation (AM) Frequency Modulation (FM) Phase Modulation(PM) Amplitude Modulation Frequency Modulation and FSK (Frequency Shift Keying) Phase Modulation and PSK Sending Multiple Bits Simultaneously In practice, the maximum number of bits that can be sent with any one of/


Spread Spectrum Techniques. Class Contents Spread Spectrum Concept  Key Characteristics Frequency Hopping Spread Spectrum  Mathematical Treatment using.

over a broader BW. TRANSMITTER: Key Characteristics of SS system The spreading code is used to demodulate the SS signal The modulated signal is fed into a demodulator to recover the original data. /Spread Spectrum. Frequency Hopping Spread Spectrum Mathematical Treatment: Using BFSK, the input signal is: where: A: Amplitude of signal f 0 : base frequency b i : value of the ith bit of data (+1 /by term with a cycle shift of itself, the number of terms that are the same differs from those that are different by/


Steve Bono1 Matthew Green1 Adam Stubblefield1 Avi Rubin1

amplitude-modulated bits Once transponder has received and processed a command, it discharges its power while transmitting response Once the transponder has fully received and processed a command, it discharges its stored power, while transmitting its response using frequency modulated frequency shift keying/board Designed to send and receive desired analog signals The authors wrote routines for modulation and demodulation to produce the signals produced by the reader and FM-FSK signals produced from the /


Photoassociation Spectroscopy of Ultracold Molecules Liantuan XIAO State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser.

Liantuan XIAO State Key Laboratory of Quantum/ modulated means to detect partial atoms being selected. Fluorescence intensity modulated Modulated fluorescence Demodulated spectrum A: modulation amplitude f : modulation frequency By using the three-dimensional modulation spectroscopy the signal-to/, 2038 (2011). We experimentally present a technique for sensitively determining the laser-induced frequency shifts of the ultracold cesium molecular vibrational and rotational levels. The scheme relies on an optical/


24 Apr06CS3282 Sectn 81 University of Manchester CS3282: Digital Communications Section 8: Carrier Modulated Transmission Convert binary data into form.

Sectn 827 Combined multi-level ASK & PSK Map to base-band 10110 t volts Multiply 24 Apr06CS3282 Sectn 828 8.3. Amplitude shift keying r(t) cos(2  c t) b(t) t r(t) t 24 Apr06CS3282 Sectn 829 8.3.2. /of transmitted pulses to minimise effect of noise (AWGN). – a channel equaliser to cancel out distortion introduced by channel...1100.. Matched filter Demodulator Channel equaliser Sample & detect b(t) Channel signal + AWGN 24 Apr06CS3282 Sectn 891 Matched filter & RRC pulses Matched filter & channel /


© 2009 Pearson Education Inc., Upper Saddle River, NJ. All rights reserved.1 Computer Networks and Internets, 5e By Douglas E. Comer Lecture PowerPoints.

.5 Frequency Modulation 10.6 Phase Shift Modulation 10.7 Amplitude Modulation And Shannons Theorem 10.8 Modulation, Digital Input, And Shift Keying 10.9 Phase Shift Keying 10.10 Phase Shift And A Constellation Diagram © 2009 Pearson Education Inc., Upper Saddle River, NJ. All rights reserved.4 Topics Covered 10.11 Quadrature Amplitude Modulation 10.12 Modem Hardware For Modulation And Demodulation 10.13 Optical And Radio Frequency/


CHAPTER 3 ANGLE MODULATION

frequency. The frequency of the modulating signal determines the frequency deviation rate. A type of modulation called frequency-shift keying (FSK) is used in transmission of binary data in digital cell phones and low- speed computer modems. /by converting the frequency deviation of FM signal to the variation of equivalent voltage. The demodulator will produce an output where its instantaneous amplitude is proportional to the instantaneous frequency of the input FM signal. EKT343 –Principle of Communication/


Modulation Formats. Optical communication systems are carrier systems. This implies that a wave of a frequency much higher than that of the information.

on the optical carrier. Amplitude, E 0 [1]Amplitude, E 0 ; the format that modulates the amplitude of the optical carrier is called “amplitude modulation”. If the information is digital then the format is known as “ amplitude shift keying” or ASK for /IF signal Frequency doubler Bandpass filter Frequency divider Data Carrier recovery arm Data detection arm Carrier recovery synchronous demodulator. The DPSK can be detected without a synchronous receiver following the DPSK signal with an optical interferometer/


CHAPTER 3 ANGLE MODULATION

frequency. The frequency of the modulating signal determines the frequency deviation rate. A type of modulation called frequency-shift keying (FSK) is used in transmission of binary data in digital cell phones and low- speed computer modems. /by converting the frequency deviation of FM signal to the variation of equivalent voltage. The demodulator will produce an output where its instantaneous amplitude is proportional to the instantaneous frequency of the input FM signal. EKT343 –Principle of Communication/


AM,FM, and digital modulation systems

line codes 5.9 Binary Modulated Bandpass Signaling binary bandpass signaling techniques : on-off keying (OOK) or Amplitude shift keying(ASK), Binary phase-shift keying (BPSK) and Frequency-shift keying(FSK). Fig.5-19 Bandpass digitally modulated signals 5.9 Binary Modulated Bandpass Signaling (/, and the source information is recovered from the dehopped signal with the use of a conventional FSK or BPSK demodulator, as appropriate. 5.13 Spread Spectrum System (Frequency hopping ) Fig.5-42 5.14 Summary AM, SSB/


CEG 3185 Tutorial 5 Modem (The Matlab scripts were originally developed by Xiaohong Liu) (The slides are prepared by Lei Chen)

are prepared by Lei Chen) TUT 5 MODEM Contents Introduction to Communication Systems Analog Modulation Amplitude Modulation (AM), Frequency Modulation (FM), and Phase Modulation (PM) Digital Communication Techniques Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), Phase Shift Keying (PSK) -- Quadrature Phase Shift Keying (QPSK) Lab 5 QPSK Modulation and Demodulation Introduction to Modulation and Demodulation The purpose of a communication system is to transmit information from a source to a/


Modulation Techniques for Mobile Radio

bit, N0 – Noise spectral density QPSK BW = RB = 1 / TB Nonlinear or envelope modulation Frequency shift keying The frequency of a constant amplitude carrier signal is switched between 2 values ( 1 and 0) Properties of FSK Transmission Bandwidth BT = 2/ Signal Modulator DATA Frequency Synchronizer Oscillator PN Code Generator Code Block Frequency hopping demodulator Wideband Filter BP Filter Demodulation DATA Frequency Hopping Signal Frequency Synthesizer Synchronization System PN Code Generator Properties of/


Prof. Dr.-Ing. Jochen Schiller, Wireless Transmission  Frequencies  Signals  Antenna  Signal propagation  Multiplexing.

Modulation (AM)  Frequency Modulation (FM)  Phase Modulation (PM) Modulation and demodulation synchronization decision digital data analog demodulation radio carrier analog baseband signal 101101001 radio receiver digital modulation digital data analog modulation radio carrier analog baseband signal 101101001 radio transmitter Digital modulation Modulation of digital signals known as Shift KeyingAmplitude Shift Keying (ASK):  very simple  low bandwidth requirements  very susceptible to interference/


An Overview of Wireless Communications

communication links and signals and consider a more abstract model for this process: Information Source Modulator Channel Demodulator Destination -------> <------ -----------> <--------------- | COS598u: Pervasive Information Systems Information Sources The information source produces the/ M different amplitudes, M different phases, or M different frequencies, the source can also be modulated onto a carrier. COS598u: Pervasive Information Systems Example - QPSK Quadrature Phase Shift Keying (QPSK) sends/


Prof. J.F. Huang, Fiber-Optic Communication Lab. National Cheng Kung University, Taiwan 1  The general expression for a binary FSK signal is  where v(t)=

carrier amplitude  c = radian carrier frequency f m (t) = binary digital modulating signal frequency  = radian difference in output frequency Frequency Shift Keying Prof. J.F. Huang, Fiber-Optic Communication Lab. National Cheng Kung University, Taiwan 2 Frequency Shift Keying  / far, the binary data were encoded as a precise phase of the transmitted carrier.  To correctly demodulate the data, a phase-coherent carrier was recovered and compared with the received carrier in a product detector/


COMMUNICATION SYSTEM EEEB453 Chapter 6 DIGITAL MODULATION

wave may be written: Modulation methods based on varying the amplitude, A, frequency, f and phase, to transmit digital data is known as Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK) and Phase Shift Keying (PSK) respectively. Example – Tx of digital data / is 2x ASK spectrum application: over voice lines, in high-frequency radio transmission, etc. Summary PSK demodulation: demodulator must be able to determine the phase of received sinusoid with respect to some reference phase advantage: (/


Communication Toolbox

sideband suppressed carrier (DSB-SC) Matlab - digital signals Modulation Features of the Toolbox - continue Matlab - digital signals Modulation methods for digital signals Amplitude shift keying (ASK) Quadrature Amplitude (QAM) Frequency shift keying (FSK) Phase shift keying (PSK) Two option for representing Modulation/demodulation process Modulation/Demodulation options Passband Baseband Analog mod/dem amod ademod Digital mod/dem dmod ddemod. Modmap Analog mod/dem amodce ademodce Digital mod/dem Modmap/


Shiv Kalyanaraman Google: “Shiv RPI”

Receiver info. Noise Channel Source User Transmitter Formatter Source encoder Channel Modulator Receiver Formatter Source decoder Channel Demodulator Digital vs Analog Comm: Basics Digital versus analog Advantages of digital communications: Regenerator receiver Different kinds of/LINEAR MODULATIONS CONVENTIONAL 4-PSK (QPSK) OFFSET (OQPSK) DIFFERENTIAL (DQPSK, p/4-DQPSK) M-ARY QUADRATURE AMPLITUDE MOD. (M-QAM) M-ARY PHASE SHIFT KEYING (M-PSK) M ¹ 4 M=4 (4-QAM = 4-PSK) Square Constellations Circular n M-/


Chapter 5: Physical Layer. 2 Fundamentals of Wireless Sensor Networks: Theory and Practice Waltenegus Dargie and Christian Poellabauer © 2010 Outline.

with a low-frequency signal  then modulate the carrier signal  The demodulation process  employs a mixer, a local oscillator, a PSF, and a comparator  to remove the high-frequency component from the modulated signal  the comparator changes the analog wave form into a stream of bits Figure 5.13 An amplitude shift-keying process using a pulse-shaping filter 53 Fundamentals of Wireless Sensor/


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

carrying multiple streams of information intermixed using time-sharing transmission demodulation-remodulation transmission demodulation-remodulation transmission demodulation-remodulation July, 19982 - 14RF100 (c) 1998 Scott /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/


Communication is the transfer of information or message from point to another.

are 1) Amplitude shift keying (ASK) 2) Frequency shift Keying (FSK) 3) Phase shift keying (PSK) DATA TRANSMISSION AND RETRIEVAL Before transmission the message signal is modulated with a carrier wave using a modulator. Modulated wave is amplified using a high frequency power amplifier and it is supplied to the transmitting antenna. The modulating signal is received using antenna at the receiving station. The signal demodulated and the/


McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Chapter 5 Analog Transmission 1.

2004 Digital-to-Analog Modulation (Digital Modulation) Digital Modulation พาบิตข้อมูลไปบนชุดของสัญญาณอนาลอก (signal unit) สัญญาณอนาลอกที่ใช้พาข้อมูล สัญญาณพาหะ (Carrier signal) ส่วนใหญ่ที่ใช้เป็น sine wave ทำได้โดยเปลี่ยนแปลงคุณสมบัติของสัญญาณพาหะ Amplitude -> Amplitude Shift Keying (ASK) Frequency -> Frequency Shift Keying (FSK) Phase-> Phase Shift Keying (PSK) Digital Demodulation การถอดบิตข้อมูลจากชุดสัญญาณอนาลอกที่ได้รับ 5 McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Bit Rate vs Baud Rate Bit rate/


SIMS-201 What is Bandwidth and How it is Used.

correction coding A/D converter Transmission Channel Input transducer Modulator Carrier EM waves (modulated signal) Receiver analog signal digital signal Error detection/ correction Output transducer D/A converter Demodulator Some Types of Digital Modulation Amplitude Shift Keying (ASK) The most basic (binary) form of ASK involves the process of switching the carrier either on or off, in correspondence to a sequence of digital pulses/


1 Mobile and Wireless Networks Summer 2005 Wichita State University Computer Science Chin-Chih Chang

The bottom diagram shows the resulting frequency- modulated signal. 31 Modulation and demodulation synchronization decision digital data analog demodulation radio carrier analog baseband signal 101101001 radio receiver digital modulation digital data analog modulation radio carrier analog baseband signal 101101001 radio transmitter 32 Digital modulation Modulation of digital signals known as Shift KeyingAmplitude Shift Keying (ASK): very simple low bandwidth requirements very susceptible to interference/


IT-101 Section 001 Lecture #15 Introduction to Information Technology.

it requires The previous section presented analog communication systems that transmit information in analog form using Amplitude or Frequency modulation Digital communication systems also employ modulation techniques, some of which include: Amplitude Shift Keying Frequency Shift Keying Phase Shift Keying  Digital Modulation Basic digital communications system Modulator Demodulator Transmission Channel Input transducer Transmitter Receiver Output transducer Carrier EM waves (modulated signal) Analog signal/


High Performance Handheld Base Station Analyzer

parameter, the constellation diagram it looks like a ring 8PSK modulation has both a Phase Shift and Amplitude Shift for it’s vector parameters, in the constellation diagram EDGE tends to look like a plate of spaghetti Demodulator Key Strokes Press the Measurements function hard key. Press the Demodulator soft key to activate the Demodulator measurement. GSM/GPRS/EDGE/TDMA RF Measurements RF Spectrum Power vs Time Slot with/


CSC 335 Data Communications and Networking Lecture 3: Signal Encoding and Conversion Dr. Cheer-Sun Yang.

and demodulation is called a modem. We will talk about modem later. Example of Data Modulation The digital signal ’01’ is sent. The carrier is reduced to 2/3 full strength to encode a 1 bit and 1/3 strength to encode a 0 bit. Modulation Techniques Amplitude shift keying (ASK) Frequency shift keying (FSK) Phase shift keying (PK) Modulation Techniques This modulation technique is called Amplitude Shift keying (ASK) technique. Amplitude Shift Keying/


Introduction to Communication Prepared By Dr. Hany Taher Modified by: Dr. Mouaaz Nahas.

(Cont.) 162 This scheme is called Frequency Shift Keying (FSK) where information digits are transmitted by keying different frequencies. Example (Cont.) 163 Example (Cont/amplitude variations in FM wave. 188 The input-output characteristics of the hard limiter. NBFM Generation (Cont.) Hard limiter input and the corresponding output. 189 Hard limiter output with respect to θ NBFM Generation (Cont.) 190 NBFM Generation (Cont.) 191 NBFM Generation (Cont.) 192 Demodulation of FM Signals The simplest demodulator/


29/01/2003Property of R. Struzak 1 Digital Modulation Basics.

processing for sensing applications. 29/01/2003Property of R. Struzak 18 Demodulation & Detection Demodulation –Is process of removing the carrier signal to obtain the original signal/Shift Keying (PSK) –Frequency Shift Keying (FSK) –Amplitude Shift Keying (ASK) 29/01/2003Property of R. Struzak 21 Non-Coherent Detection Requires no reference wave; does not exploit phase reference information (envelope detection) –Differential Phase Shift Keying (DPSK) –Frequency Shift Keying (FSK) –Amplitude Shift Keying/


19/09/2015 1 Digital Modulation Basics. 19/09/2015 2 Outline PCM Introduction to digital modulation Relevant modulation schemes Geometric representations.

to reproduce the transmitted signal and demodulate. Requires a replica carrier wave of the same frequency and phase at the receiver. The received signal and replica carrier are cross- correlated using information contained in their amplitudes and phases. Also known as synchronous detection 19/09/2015 28 Coherent Detection [2] Applicable to –Phase Shift Keying (PSK) –Frequency Shift Keying (FSK) –Amplitude Shift Keying (ASK) Carrier recovery methods include –Pilot/


IT-101 Section 001 Lecture #15 Introduction to Information Technology.

it requires The previous section presented analog communication systems that transmit information in analog form using Amplitude or Frequency modulation Digital communication systems also employ modulation techniques, some of which include: Amplitude Shift Keying Frequency Shift Keying Phase Shift Keying  Digital Modulation Basic digital communications system Modulator Demodulator Transmission Channel Input transducer Transmitter Receiver Output transducer Carrier EM waves (modulated signal) Analog signal/


Prof. Maria Papadopouli

BER of these regions is larger Gaussian frequency shift keying (GFSK) Encodes data as a series of frequency changes in a carrier Noise usually changes the amplitude of a signal Modulation that ignores amplitude (e.g., broadcast FM)  Relatively / Encodes portion of the signal across each sub-channel in parallel This spacing provides the "orthogonality" Preventing demodulators from seeing other frequencies Provides High spectral efficiency Resiliency to RF interference Lower multi-path distortion OFDM OFDM/


Principles of Electronic Communication Systems

detectors have less distortion and a better signal-to-noise ratio than standard diode detectors. 4-3: Amplitude Demodulators Synchronous Detection The key to making the synchronous detector work is to ensure that the signal producing the switching action is perfectly /method. 4-5: SSB Circuits Generating SSB Signals: Phasing Method The phasing method of SSB generation uses a phase-shift technique that causes one of the sidebands to be canceled out. The phasing method uses two balanced modulators which /


Slide 1 Digital Communications Aspects of Physical Layer Radio Systems Michael Fitz

in bandpass signals –Two low pass signals Communication engineers use two representations –In-phase and quadrature –Amplitude and phase Slide 9 Complex Envelope Complex envelope Representing two signals as a complex vector Slide 10 /shift keying Signals Slide 34 BPSK Vector Diagram Slide 35 BPSK Bandpass Signal Slide 36 Spectral Characteristics Slide 37 Review of Binary Detection Problem formulation Statistics are the digital communication engineer’s friend Slide 38 Maximum A Posterior Word Demodulation/


A Company Selling Technology and not just a Product.

stand-alone mode.  Three carrier modulation options are available on the kit. a) Amplitude Shift Keying (ASK) b) Frequency Shift Keying (FSK) c) Phase Shift Keying (PSK). A Company Selling Technology and not just a Product DCL-06 : ASK / PSK / FSK Modulation and Demodulation Kit DCL-07  “DCL-07: Delta / Sigma / Adaptive Delta Modulation And Demodulation Kit” is a compact single board unit in wooden casing and it provides/


McGraw-Hill © 2008 The McGraw-Hill Companies, Inc. All rights reserved. Principles of Electronic Communication Systems.

diode detectors. McGraw-Hill © 2008 The McGraw-Hill Companies, Inc. All rights reserved. 4-3: Amplitude Demodulators Synchronous Detection  The key to making the synchronous detector work is to ensure that the signal producing the switching action is perfectly /reserved. 4-5: SSB Circuits Generating SSB Signals: Phasing Method  The phasing method of SSB generation uses a phase-shift technique that causes one of the sidebands to be canceled out.  The phasing method uses two balanced modulators which /


McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Chapter 5 Analog Transmission.

2004 Digital-to-Analog Modulation (Digital Modulation) Digital Modulation พาบิตข้อมูลไปบนชุดของสัญญาณ อนาลอก (signal unit) สัญญาณอนาลอกที่ใช้พาข้อมูล สัญญาณพาหะ (Carrier signal) ส่วนใหญ่ที่ใช้เป็น sine wave ทำได้โดยเปลี่ยนแปลงคุณสมบัติของ สัญญาณพาหะ Amplitude -> Amplitude Shift Keying (ASK) Frequency -> Frequency Shift Keying (FSK) Phase-> Phase Shift Keying (PSK) Digital Demodulation การถอดบิตข้อมูลจากชุดสัญญาณ อนาลอกที่ได้รับ McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Bit Rate vs Baud Rate Bit rate/


McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 UNIT - 3 | Website for students | VTU NOTES.

students | VTU NOTES Types of digital-to-analog modulation Modulating techniques are 1)Amplitude Shift Keying (ASK) 2) Frequency Shift Keying (FSK) 3) Phase Shift Keying (PSK) 4) Quadrature Amplitude Modulation (QAM) www.bookspar.com | Website for students | VTU NOTES Bit /to decompose the multiplexed signal into its constituent component signals. The individual signals are then passed to a demodulator that separates them from their carriers and passes them to the receivers. www.bookspar.com | Website for/


Chapter 3 Digital Transmission Fundamentals

is centered in middle of bandpass channel Modulators embed information into a sinusoid Amplitude Modulation and Frequency Modulation Information 1 +1 Amplitude Shift Keying t T 2T 3T 4T 5T 6T -1 Map bits into amplitude of sinusoid: “1” send sinusoid; “0” no sinusoid Demodulator looks for signal vs. no signal +1 Frequency Shift Keying t T 2T 3T 4T 5T 6T -1 Map bits into frequency: “1/


Mobile Communications Chapter 2: Wireless Transmission

radio carrier analog baseband signal digital data analog demodulation synchronization decision radio receiver 101101001 radio carrier Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 2.23 Digital modulation Modulation of digital signals known as Shift Keying Amplitude Shift Keying (ASK): very simple low bandwidth requirements very susceptible to interference Frequency Shift Keying (FSK): needs larger bandwidth Phase Shift Keying (PSK): more complex robust against interference 1 1/


Mobile Communications Chapter 2: Wireless Transmission

analog baseband signal digital data analog demodulation synchronization decision radio receiver 101101001 radio carrier Prof. Dr.-Ing. Jochen H. Schiller www.jochenschiller.de MC - 2015 Prof. Dr. Dr. h.c. G. Krüger E. Dorner / Dr. J. Schiller Universität Karlsruhe Institut für Telematik Mobilkommunikation SS 1998 Digital modulation Modulation of digital signals known as Shift Keying Amplitude Shift Keying (ASK): very simple low bandwidth/


Wireless & Mobile Communications Chapter 2: Wireless Transmission

radio transmitter 101101001 radio carrier analog baseband signal digital data analog demodulation synchronization decision radio receiver 101101001 radio carrier ICS 243E - Ch.2 Wireless Transmission Spring 2003 Digital Modulation Modulation of digital signals known as Shift Keying Amplitude Shift Keying (ASK): very simple low bandwidth requirements very susceptible to interference Frequency Shift Keying (FSK): needs larger bandwidth Phase Shift Keying (PSK): more complex robust against interference 1 1 t 1/


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

Modulation (AM)  Frequency Modulation (FM)  Phase Modulation (PM) Modulation and demodulation synchronization decision digital data analog demodulation radio carrier analog baseband signal 101101001 radio receiver digital modulation digital data analog modulation radio carrier analog baseband signal 101101001 radio transmitter Digital modulation Modulation of digital signals known as Shift KeyingAmplitude Shift Keying (ASK):  very simple  low bandwidth requirements  very susceptible to interference/


CSE 475 Wireless and Mobile Networks Spring 2011-2012 Marmara University – Computer Engineering Assist. Prof. Ömer Korçak mimoza.marmara.edu.tr/~omer.korcak.

Modulation (AM) Frequency Modulation (FM) Phase Modulation (PM) Modulation and demodulation synchronization decision digital data analog demodulation radio carrier analog baseband signal 101101001 radio receiver digital modulation digital data analog modulation radio carrier analog baseband signal 101101001 radio transmitter Digital modulation Modulation of digital signals known as Shift Keying Amplitude Shift Keying (ASK): very simple low bandwidth requirements very susceptible to interference Frequency/


Wireless Radio Communications IT351: Mobile & Wireless Computing Objectives: – To study the wireless radio communication medium, spectrum and signals.

Modulation (AM) Frequency Modulation (FM) Phase Modulation (PM) Modulation and demodulation synchronization decision digital data analog demodulation radio carrier analog baseband signal 101101001 radio receiver digital modulation digital data analog modulation radio carrier analog baseband signal 101101001 radio transmitter Digital Modulation - Amplitude Shift Keying (ASK) Amplitude Shift Keying (ASK) –0 and 1 represented by different amplitudes i.e. a basic sine wave –Problem: susceptible to interference/


Analog & Digital Signals © Prof. Aiman Hanna Department of Computer Science Concordia University Montreal, Canada.

Frequencies), One Bit per Baud – Analog signal for 01001 21 D igital-to-Analog- Conversion Amplitude Modulation (AM)  Also known as Amplitude Shift Keying (ASK)  Each bit group is assigned to an analog signal of given magnitude  The / odems (continue...) Cable Modems  A number of techniques can be used for modulating & demodulating, but two are more popular: Quaternary Phase Shift Keying (QPSK)Quaternary Phase Shift Keying (QPSK) QAM64, a variation of QAMQAM64, a variation of QAM  QAM64 is typical /


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