142 Dpsk PPTs View free & download

Performance Evaluation of DPSK Optical Fiber Communication Systems PowerPoint PPT Presentation

Performance Evaluation of DPSK Optical Fiber Communication Systems - ... (Ex. Erbium-Doped Fiber Amplifier) Complicated DPSK transmitter and receiver Stringent requirements on laser linewidth (

... (Ex. Erbium-Doped Fiber Amplifier) Complicated DPSK transmitter and receiver Stringent requirements on laser linewidth (

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Per-survivor Based Detection of DPSK Modulated High Rate Turbo Codes Over Rayleigh Fading Channels PowerPoint PPT Presentation

Per-survivor Based Detection of DPSK Modulated High Rate Turbo Codes Over Rayleigh Fading Channels - Per-survivor Based Detection of DPSK Modulated High Rate Turbo Codes Over Rayleigh Fading Channels Bin Zhao and Matthew C. Valenti Lane Dept. of Comp. Sci. & Elect.

Per-survivor Based Detection of DPSK Modulated High Rate Turbo Codes Over Rayleigh Fading Channels Bin Zhao and Matthew C. Valenti Lane Dept. of Comp. Sci. & Elect.

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Iterative Demodulation and Decoding of DPSK Modulated Turbo Codes over Rayleigh Fading Channels PowerPoint PPT Presentation

Iterative Demodulation and Decoding of DPSK Modulated Turbo Codes over Rayleigh Fading Channels - With coherent detection, turbo codes have remarkable performance in AWGN and fading channels. However with non-coherent or partially ... S. Ten Brink, 1999. ...

With coherent detection, turbo codes have remarkable performance in AWGN and fading channels. However with non-coherent or partially ... S. Ten Brink, 1999. ...

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Signal Processing Challenges Towards 100G Optical Links Andrew C' Singer University of Illinois at U PowerPoint PPT Presentation

Signal Processing Challenges Towards 100G Optical Links Andrew C' Singer University of Illinois at U - NRZ, RZ, CSRZ, ODB, DPSK, DQPSK, QPSK, Polarization Mux. MZ modulators. laser source ... Polarisation Beam Splitter. PBS. 90 90 PIN-TIA. PIN-TIA. PIN-TIA ...

NRZ, RZ, CSRZ, ODB, DPSK, DQPSK, QPSK, Polarization Mux. MZ modulators. laser source ... Polarisation Beam Splitter. PBS. 90 90 PIN-TIA. PIN-TIA. PIN-TIA ...

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Microwave Photonics Applications: Radio-over-Fiber PowerPoint PPT Presentation

Microwave Photonics Applications: Radio-over-Fiber - ... (mod.) (2.6 GHz) PRBS (156 Mb/s) BERT DPSK (demod.) (3.0 GHz) LD LD 1 2 PD Att. 60GHz EDFA-2 SMF SMF 57GHz 57GHz Two-Section EAT The EAT is the only optical ...

... (mod.) (2.6 GHz) PRBS (156 Mb/s) BERT DPSK (demod.) (3.0 GHz) LD LD 1 2 PD Att. 60GHz EDFA-2 SMF SMF 57GHz 57GHz Two-Section EAT The EAT is the only optical ...

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SignalEx: Linking environmental acoustics with the signaling schemes PowerPoint PPT Presentation

SignalEx: Linking environmental acoustics with the signaling schemes - SignalEx-D (Buzzard's Bay) August 10-11, 2000. Ray/beam trace and incoherent TL. CTD Record ... SX-D (Buzzard's Bay) impulse response. Drift 1: 0-3.5 km. Drift ...

SignalEx-D (Buzzard's Bay) August 10-11, 2000. Ray/beam trace and incoherent TL. CTD Record ... SX-D (Buzzard's Bay) impulse response. Drift 1: 0-3.5 km. Drift ...

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Diapositiva 1 PowerPoint PPT Presentation

Diapositiva 1 - MUESTREO, CUANTIFICACI N Y CODIFICIACI N Espectro de la se al muestreada Reconstrucci n de la se al muestreada Transmisi n s ncrona y as ncrona Velocidad de ...

MUESTREO, CUANTIFICACI N Y CODIFICIACI N Espectro de la se al muestreada Reconstrucci n de la se al muestreada Transmisi n s ncrona y as ncrona Velocidad de ...

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Kvantekryptografi med fotoner i optiske fibre PowerPoint PPT Presentation

Kvantekryptografi med fotoner i optiske fibre - ... N. Gisin, 'Quantum cryptography using entangled photons in energy-time Bell states,' Phys. ... also in implementations with source of entangled pairs ...

... N. Gisin, 'Quantum cryptography using entangled photons in energy-time Bell states,' Phys. ... also in implementations with source of entangled pairs ...

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Chapter Four PowerPoint PPT Presentation

Chapter Four - Bit error probability is similar to the one for non-coherently detected binary FSK ... Symbol error performance for coherently detected M-ary PSK ...

Bit error probability is similar to the one for non-coherently detected binary FSK ... Symbol error performance for coherently detected M-ary PSK ...

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Presentazione di PowerPoint PowerPoint PPT Presentation

Presentazione di PowerPoint - Bononi, P. Serena, A. Orlandini, and N. Rossi. Dipartimento di Ingegneria dell'Informazione, Universit di Parma ... model assumes zero chromatic dispersion (GVD) ...

Bononi, P. Serena, A. Orlandini, and N. Rossi. Dipartimento di Ingegneria dell'Informazione, Universit di Parma ... model assumes zero chromatic dispersion (GVD) ...

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Digital communication PowerPoint PPT Presentation

Digital communication - ... energy per bit. The noise spectral density is. or. In QPSK E = 2 Eb. BASK. Transmitter. BASK Receiver. Non coherent ASK. Transmitter. Coherent FSK. Coherent FSK ...

... energy per bit. The noise spectral density is. or. In QPSK E = 2 Eb. BASK. Transmitter. BASK Receiver. Non coherent ASK. Transmitter. Coherent FSK. Coherent FSK ...

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Complementary Code Keying PowerPoint PPT Presentation

Complementary Code Keying - Common problems with digital Radio Communications. Interference from other ... DSSS with use of Barker's code is more stable according to the long range and ...

Common problems with digital Radio Communications. Interference from other ... DSSS with use of Barker's code is more stable according to the long range and ...

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802.2LLC - 802.1 802.2LLC 802.3 CSMA/CD 802.4 Token-Bus 802.5 Token-Ring 802.6 DQDB 802.9 Isochronous Ethernet 802.11 Wireless LAN 802.12 100VG-

802.1 802.2LLC 802.3 CSMA/CD 802.4 Token-Bus 802.5 Token-Ring 802.6 DQDB 802.9 Isochronous Ethernet 802.11 Wireless LAN 802.12 100VG-

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Wireless%20Communications%20Principles%20and%20Practice%202/e%20T.S.%20Rapppaport PowerPoint PPT Presentation

Wireless%20Communications%20Principles%20and%20Practice%202/e%20T.S.%20Rapppaport - Key Digital Modulation Techniques: BPSK, OFDM, GMSK 2002 Pearson Education, Inc. ... Product Detection 2002 Pearson Education, Inc. ...

Key Digital Modulation Techniques: BPSK, OFDM, GMSK 2002 Pearson Education, Inc. ... Product Detection 2002 Pearson Education, Inc. ...

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Wireless Communications Principles and Practice 2/e T.S. Rapppaport PowerPoint PPT Presentation

Wireless Communications Principles and Practice 2/e T.S. Rapppaport - Wireless Communications Principles and Practice 2/e T.S. Rapppaport Chapter 6: Modulation Techniques for Mobile Radio Analog and Digital Modulation, Line Coding, AM ...

Wireless Communications Principles and Practice 2/e T.S. Rapppaport Chapter 6: Modulation Techniques for Mobile Radio Analog and Digital Modulation, Line Coding, AM ...

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Chapter 7 Error Probabilities for Noncoherent Systems PowerPoint PPT Presentation

Chapter 7 Error Probabilities for Noncoherent Systems - Chapter 7 Error Probabilities for Noncoherent Systems Noncoherent Detection of OOK Noncoherent Detection of FSK Differential Phase Shift Keying Huseyin Bilgekul

Chapter 7 Error Probabilities for Noncoherent Systems Noncoherent Detection of OOK Noncoherent Detection of FSK Differential Phase Shift Keying Huseyin Bilgekul

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Optical Signals Modulation and Compensation of Chromatic Dispersion PowerPoint PPT Presentation

Optical Signals Modulation and Compensation of Chromatic Dispersion - The SEEFIRE project is co-funded by the European Commission under ... Both phase-shift methods are accurate, measurement throught optical amplifiers, expensive ...

The SEEFIRE project is co-funded by the European Commission under ... Both phase-shift methods are accurate, measurement throught optical amplifiers, expensive ...

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Diapositiva 1 - ... and Communication Engineering (CEIIC), and of CNIT (Consorzio Nazionale ... various sources: Italian Government, industrial partners and European Commission. ...

... and Communication Engineering (CEIIC), and of CNIT (Consorzio Nazionale ... various sources: Italian Government, industrial partners and European Commission. ...

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Plenary: ACC Workshop PowerPoint PPT Presentation

Plenary: ACC Workshop - Plenary: ACC Workshop Robust and Reconfigurable High-Capacity Optical Communication Systems Alan E. Willner University of Southern California Los Angeles, CA 90089-2565

Plenary: ACC Workshop Robust and Reconfigurable High-Capacity Optical Communication Systems Alan E. Willner University of Southern California Los Angeles, CA 90089-2565

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Wireless Communications Principles and Practice 2/e T.S. Rapppaport - Wireless Communications. Principles and Practice. 2/e. T.S. Rapppaport. Chapter 6: Modulation Techniques for Mobile Radio 2002 Pearson Education, Inc. ...

Wireless Communications. Principles and Practice. 2/e. T.S. Rapppaport. Chapter 6: Modulation Techniques for Mobile Radio 2002 Pearson Education, Inc. ...

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1. Echantillonnage et quantification PowerPoint PPT Presentation

1. Echantillonnage et quantification - On d sire chantillonner un signal sinuso dal de 10 kHz, avec un rapport signal/bruit sup rieur 70 dB ... de phase diff rentielle 2 symboles) pour encoder la cha ne binaire ...

On d sire chantillonner un signal sinuso dal de 10 kHz, avec un rapport signal/bruit sup rieur 70 dB ... de phase diff rentielle 2 symboles) pour encoder la cha ne binaire ...

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Chromatic Dispersion Monitoring for WDM Systems using VestigialSideband Optical Filtering PowerPoint PPT Presentation

Chromatic Dispersion Monitoring for WDM Systems using VestigialSideband Optical Filtering - Intensity. Modulator. CS-RZ format. V. time. M-Z Output. Driving ... Intensity. Modulator. Optical. Filter. VSB Filtering. 228. OFC 2004 Modulation Formats ...

Intensity. Modulator. CS-RZ format. V. time. M-Z Output. Driving ... Intensity. Modulator. Optical. Filter. VSB Filtering. 228. OFC 2004 Modulation Formats ...

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TEKNIK MODULASI PADA KOMUNIKASI DATA PowerPoint PPT Presentation

TEKNIK MODULASI PADA KOMUNIKASI DATA - Universitas Mercu Buana Teknik Informatika TEKNIK MODULASI PADA KOMUNIKASI DATA Proses penumpangan signal analog atau Digital pad Signal Pembawa yang berupa ...

Universitas Mercu Buana Teknik Informatika TEKNIK MODULASI PADA KOMUNIKASI DATA Proses penumpangan signal analog atau Digital pad Signal Pembawa yang berupa ...

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Digital Modulation PowerPoint PPT Presentation

Digital Modulation - QPSK * of 30 Multi-level (M-ary) Phase and Amplitude Modulation Amplitude and phase shift keying can be combined to transmit several bits per symbol.

QPSK * of 30 Multi-level (M-ary) Phase and Amplitude Modulation Amplitude and phase shift keying can be combined to transmit several bits per symbol.

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Background: Optically Coherent vs' Differential Detection PowerPoint PPT Presentation

Background: Optically Coherent vs' Differential Detection - A pair of BALANCED DETECTORs in quadrature ... Building block for coherent and differential detection: Balanced detector ... INTERFEROMETER (DI) T. 7 ...

A pair of BALANCED DETECTORs in quadrature ... Building block for coherent and differential detection: Balanced detector ... INTERFEROMETER (DI) T. 7 ...

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Ch04-1 - Title: Modulation Author: Last modified by: Created Date: 2/9/2004 4:32:51 PM Document presentation format:

Title: Modulation Author: Last modified by: Created Date: 2/9/2004 4:32:51 PM Document presentation format:

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ISO 180004 Mode 4 2,45 GHz RFID for Item Management PowerPoint PPT Presentation

ISO 180004 Mode 4 2,45 GHz RFID for Item Management - Italy. ISO 18000-4 Mode 4. RFID for large, moving objects ... 16 bit start flag. 70 bit data, plus 10 stuffed zero bits. 7 bit status, plus 1 stuffed zero bit ...

Italy. ISO 18000-4 Mode 4. RFID for large, moving objects ... 16 bit start flag. 70 bit data, plus 10 stuffed zero bits. 7 bit status, plus 1 stuffed zero bit ...

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System parameters and performance PowerPoint PPT Presentation

System parameters and performance - System parameters and performance CDMA-2000, W-CDMA (UMTS), GSM 900, WLAN 802.11a, WLAN 802.11b, Bluetooth. By ystein Taskjelle Bluetooth Based on IEEE 802.15 WPAN ...

System parameters and performance CDMA-2000, W-CDMA (UMTS), GSM 900, WLAN 802.11a, WLAN 802.11b, Bluetooth. By ystein Taskjelle Bluetooth Based on IEEE 802.15 WPAN ...

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Etude des nouveaux formats de modulation pour la mont PowerPoint PPT Presentation

Etude des nouveaux formats de modulation pour la mont - TV num rique HD. 3 Mb/s. TV num rique SD. 1 Mb/s. Jeux en ligne. 2 Mb/s ... High density of information (Bit/s/Hz) increase the bit rate without increasing ...

TV num rique HD. 3 Mb/s. TV num rique SD. 1 Mb/s. Jeux en ligne. 2 Mb/s ... High density of information (Bit/s/Hz) increase the bit rate without increasing ...

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EE Engineering PowerPoint PPT Presentation

EE Engineering - Equivalent lowpass received signal, and for unmodulated carrier ... combining consists of receiving redundantly the same information-bearing signal ...

Equivalent lowpass received signal, and for unmodulated carrier ... combining consists of receiving redundantly the same information-bearing signal ...

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The CMX868 Modem PowerPoint PPT Presentation

The CMX868 Modem - On chip hybrid for simple line interfacing ... Bandpass filter to attenuate unwanted signals. Provides line equalisation for all modes ...

On chip hybrid for simple line interfacing ... Bandpass filter to attenuate unwanted signals. Provides line equalisation for all modes ...

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4. EMC??? ? ???? ? PowerPoint PPT Presentation

4. EMC??? ? ???? ? - 802.11b CCK. CCK: Complementary Code Keying. 11Mbps. . . DQPSK. . 11Mcps. 1Msps. . S/P. 1:8. 2. 6. . . ...

802.11b CCK. CCK: Complementary Code Keying. 11Mbps. . . DQPSK. . 11Mcps. 1Msps. . S/P. 1:8. 2. 6. . . ...

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JRA7: SilicononInsulator SOI based optical board technology for multipurpose hybrid integration PowerPoint PPT Presentation

JRA7: SilicononInsulator SOI based optical board technology for multipurpose hybrid integration - complementary solder deposition techniques ... Document 'Evaluation self-aligning flip-chip soldering technologies' (milestone) ...

complementary solder deposition techniques ... Document 'Evaluation self-aligning flip-chip soldering technologies' (milestone) ...

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Networking over Bluetooth: overview and issues PowerPoint PPT Presentation

Networking over Bluetooth: overview and issues - ESS and all of its stations appear to be a single MAC layer. AP communicate among themselves to ... DSSS provides good immunity against narrowband interferer ...

ESS and all of its stations appear to be a single MAC layer. AP communicate among themselves to ... DSSS provides good immunity against narrowband interferer ...

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Modulation Techniques PowerPoint PPT Presentation

Modulation Techniques - All modulation techniques involve operation on one or more of the three fundamental frequency domain parameters: amplitude, frequency, and phase.

All modulation techniques involve operation on one or more of the three fundamental frequency domain parameters: amplitude, frequency, and phase.

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Systeme II - Title: Vorlesung Algorithmen f r Peer-to-Peer-Netzwerke Author: Christian Schindelhauer Keywords: MUA, Vorlesung Last modified by: Christian Schindelhauer

Title: Vorlesung Algorithmen f r Peer-to-Peer-Netzwerke Author: Christian Schindelhauer Keywords: MUA, Vorlesung Last modified by: Christian Schindelhauer

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Cellular Evolution and 3G Roadmap' PowerPoint PPT Presentation

Cellular Evolution and 3G Roadmap' - Power efficiency = The ability a modulation technique to preserve the fidelity ... Data modulation : BPSK (Binary Phase Shift Keying) ...

Power efficiency = The ability a modulation technique to preserve the fidelity ... Data modulation : BPSK (Binary Phase Shift Keying) ...

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Petrozavodsk State University, Alex Moschevikin, 2004 PowerPoint PPT Presentation

Petrozavodsk State University, Alex Moschevikin, 2004 - Title: PowerPoint Author: Win98SE Last modified by: ROOT Created Date: 11/8/2003 9:33:33 AM Document presentation format:

Title: PowerPoint Author: Win98SE Last modified by: ROOT Created Date: 11/8/2003 9:33:33 AM Document presentation format:

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Josef Vojtech PowerPoint PPT Presentation

Josef Vojtech - Equipment for open photonic networking www.ces.net czechlight.cesnet.cz Josef Vojt ch Miloslav H la, Jan Nejman, Jan Radil, Pavel koda vojtech (at) cesnet (dot) cz

Equipment for open photonic networking www.ces.net czechlight.cesnet.cz Josef Vojt ch Miloslav H la, Jan Nejman, Jan Radil, Pavel koda vojtech (at) cesnet (dot) cz

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EE 551451, Fall, 2006 Communication Systems PowerPoint PPT Presentation

EE 551451, Fall, 2006 Communication Systems - EE 551/451, Fall, 2006. Communication Systems. Zhu Han ... EE 541/451 Fall 2006. Remember channel capacity C=Wlog2 (1 SNR) fb ...

EE 551/451, Fall, 2006. Communication Systems. Zhu Han ... EE 541/451 Fall 2006. Remember channel capacity C=Wlog2 (1 SNR) fb ...

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Optical Fiber Communications: Even More Fun in the PostBubble Era - Optical Fiber Communications: Even More Fun in the PostBubble Era

Optical Fiber Communications: Even More Fun in the PostBubble Era

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The Path to 100G New challenges for 40G and 100G Networks PowerPoint PPT Presentation

The Path to 100G New challenges for 40G and 100G Networks - ... is better Co-operate with existing 10G/40G channels Compatible with EDFAs and ROADMs High OSNR High Rx Sensitivity Low EDFA Noise The answer: New ...

... is better Co-operate with existing 10G/40G channels Compatible with EDFAs and ROADMs High OSNR High Rx Sensitivity Low EDFA Noise The answer: New ...

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Chapter 8: Data Communication Fundamentals PowerPoint PPT Presentation

Chapter 8: Data Communication Fundamentals - Chapter 8: Data Communication Fundamentals Business Data Communications, 4e Three Components of Data Communication Data Analog: Continuous value data (sound, light ...

Chapter 8: Data Communication Fundamentals Business Data Communications, 4e Three Components of Data Communication Data Analog: Continuous value data (sound, light ...

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Topic 4: Physical Layer - Chapter 8: Data Communication Fundamentals PowerPoint PPT Presentation

Topic 4: Physical Layer - Chapter 8: Data Communication Fundamentals - ITU-T now recommends the term baud rate be replaced by the term symbol rate. ... modems only, baud=BPS. The bit rate and the symbol rate (or baud rate) are the ...

ITU-T now recommends the term baud rate be replaced by the term symbol rate. ... modems only, baud=BPS. The bit rate and the symbol rate (or baud rate) are the ...

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ATN Air-Ground Subnetworks PowerPoint PPT Presentation

ATN Air-Ground Subnetworks - ATN Air-Ground Subnetworks Presentation ATN2.2 by R. Oishi, ARINC CAO Regional ATN Seminar 6-7 May 2002

ATN Air-Ground Subnetworks Presentation ATN2.2 by R. Oishi, ARINC CAO Regional ATN Seminar 6-7 May 2002

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Telefonia B - Criada a Strowger Automatic Telephone Exchange. 1892 - Almon Strowger, the St. Louis, ... A central por comando Crossbar Figura de um seletor crossbar: ...

Criada a Strowger Automatic Telephone Exchange. 1892 - Almon Strowger, the St. Louis, ... A central por comando Crossbar Figura de um seletor crossbar: ...

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Sistem Komunikasi Bergerak ( Cellular ) PowerPoint PPT Presentation

Sistem Komunikasi Bergerak ( Cellular ) - Dahlan Abdullah dahlan@unimal.ac.id http://dahlan.unimal.ac.id

Dahlan Abdullah dahlan@unimal.ac.id http://dahlan.unimal.ac.id

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The Impact of Channel Estimation Errors on Space-Time Block Codes PowerPoint PPT Presentation

The Impact of Channel Estimation Errors on Space-Time Block Codes - ... between the ith transmit antenna and the receive antenna undergoes flat-fading: ... If we have only one receive antenna then the received signal at time t can be ...

... between the ith transmit antenna and the receive antenna undergoes flat-fading: ... If we have only one receive antenna then the received signal at time t can be ...

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Encoding - Midbit transition is only for clocking. Transition at beginning of bit period=0. Transition absent at beginning=1. Has added advantage of differential encoding ...

Midbit transition is only for clocking. Transition at beginning of bit period=0. Transition absent at beginning=1. Has added advantage of differential encoding ...

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Plenary: ACC Workshop - The generous support and collaboration of CISCO, DARPA, HP, Intel, NSF, Packard ... Nick Tabellion, CTO, Fujitsu Softek: 'The commonly used number is: For every $1 ...

The generous support and collaboration of CISCO, DARPA, HP, Intel, NSF, Packard ... Nick Tabellion, CTO, Fujitsu Softek: 'The commonly used number is: For every $1 ...

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Ingegneria dell'Informazione PowerPoint PPT Presentation

Ingegneria dell'Informazione - Throughput and Energy Ef?ciency of Bluetooth v2 EDR in Fading Channels. A note on the use of ... Well, in most cases, we cannot provide univocal answers...

Throughput and Energy Ef?ciency of Bluetooth v2 EDR in Fading Channels. A note on the use of ... Well, in most cases, we cannot provide univocal answers...

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Comunicaciones por Fibra ptica PowerPoint PPT Presentation

Comunicaciones por Fibra ptica - Basados en la multiplicaci n por una portadora de frecuencia ... ASK: Amplitude Shift Keying. PSK: Phase Shift Keying. FSK: Frequency Shift Keying. Formato ASK ...

Basados en la multiplicaci n por una portadora de frecuencia ... ASK: Amplitude Shift Keying. PSK: Phase Shift Keying. FSK: Frequency Shift Keying. Formato ASK ...

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Modulation, Demodulation and Coding Course PowerPoint PPT Presentation

Modulation, Demodulation and Coding Course - Pulse shaping to have zero ISI at the sampling time ... Eye pattern:Display on an oscilloscope which sweeps the system response to a ...

Pulse shaping to have zero ISI at the sampling time ... Eye pattern:Display on an oscilloscope which sweeps the system response to a ...

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Chapter 4 Modulation and Demodulation PowerPoint PPT Presentation

Chapter 4 Modulation and Demodulation - Recall page252 For a system with optical amplifier If systems with cascades of optical amplifiers, optical signal consists of a lot of optical noise, ...

Recall page252 For a system with optical amplifier If systems with cascades of optical amplifiers, optical signal consists of a lot of optical noise, ...

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(b) ??????? - Title: PowerPoint Author: eecs-001 Last modified by: Created Date: 8/14/2003 6:02:16 AM Document presentation format:

Title: PowerPoint Author: eecs-001 Last modified by: Created Date: 8/14/2003 6:02:16 AM Document presentation format:

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Communication Engineering N Digital Communications Systems (part 2) Mr. Mark Ho, ITR Version 27/9/00 PowerPoint PPT Presentation

Communication Engineering N Digital Communications Systems (part 2) Mr. Mark Ho, ITR Version 27/9/00 - Simulation of Mixer Imperfections. X ... Mixer. Mixer out = (in1 in2)2. Mixer out = (in1 in2)2 k3(in1 in2)3. In the lower spectrum plot, we've added a 3rd ...

Simulation of Mixer Imperfections. X ... Mixer. Mixer out = (in1 in2)2. Mixer out = (in1 in2)2 k3(in1 in2)3. In the lower spectrum plot, we've added a 3rd ...

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Dpsk PowerPoint PPT Presentations