orthogonal frequency division multiplexing for optical communications

... friend Mona Alsayigh for her assistance Not forgetting also, my examiners and all committee members for their helpful suggestions iv ABSTRACT Orthogonal Frequency Division Multiplexing (OFDM) ... INTERPOLATION METHOD FOR CHANNEL ESTIMATION IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) SYSTEM USING PILOT SIGNALS AHMED NOORI HUMMADI THESIS SUBMITTED IN FULFILMENT FOR THE DEGREE OF ... performance based on QPSK Modulation 83 4.4 The OFDM systems performance based on DBPSK Modulation 85 4.5 The OFDM systems performance based on DQPSK Modulation 87 4.6 The OFDM systems performance

Ngày tải lên: 26/05/2013, 21:28

... the IEEE P802.15 WPAN project is to use a multiband orthogonal frequency-division multiplexing (OFDM) system and punctured convolutional codes for UWB channels supporting a data rate up to 480 ... (ISI) caused by multipath channels are equalization and orthogonal frequency-division multiplexing (OFDM) [4] OFDM is a promising solution for efficiently capturing multipath energy in highly dispersive ... Article ID 91329, Pages 1 12DOI 10.1155/WCN/2006/91329 High-Speed Turbo-TCM-Coded Orthogonal Frequency-Division Multiplexing Ultra-Wideband Systems Yanxia Wang, Libo Yang, and Lei Wei School of

Ngày tải lên: 22/06/2014, 22:20

... Pietikäinen Communications Laboratory / HUT S-72.333 Postgraduate Course in Radio Communications Kari Pietikäinen Communications Laboratory / HUT S-72.333 Postgraduate Course in Radio Communications Orthogonal ... Communications Orthogonal Frequency Division Multiplexing Kari Pietikäinen kari.pietikainen@hut.fi Postgraduate Course in Radio Communications 30.11. Kari Pietikäinen Communications Laboratory ... components • Pilots are designed for easy detection • Pilots are used for channel estimation – Frequency and phase offsets – Can be used for synchronization Kari Pietikäinen Communications Laboratory

Ngày tải lên: 11/07/2014, 20:21

... tải hiệu quả hơn 2.2 Sự khác nhau giữa OFDM và FDM (Frequency Division Multiplexing) Kỹ thuật ghép kênh theo tần số FDM (Frequency Division Multiplexing) làtruyền đồng thời các tín hiệu nhánh ... hóa, kinh tế, chính trị, khoa học kỹ thuật rất đa dạng và phong phú Kỹ thuật OFDM (Orthogonal Frequency Division Multiplexing) đã từng là một bước đột phá quan trọng trong lĩnh vực truyền dẫn dữ ... như truyền hình vệ tinh 1.4 Tương lai phát triển của kỹ thuật OFDM Công nghệ OFDM (Orthogonal Frequency Division Multiplexing) đã và đang chứng minh vai trò quan trọng trong việc truyền dẫn dữ liệu

Ngày tải lên: 20/08/2024, 15:07

... television Coded Orthogonal Frequency Division Multiplexing • Need for a good transmission technique • Explanation of the different parts • Coded • Frequency Division Multiplexing • Orthogonal Trang ... Mb/s in 7 MHz • Developed for 8 MHz channels – A 7 MHz variant has been produced and tested • Can use single frequency networks - SFNs • New technology with scope for continued improvement ... receiver bandwidths proposed – 500 kHz portable / mobile for sound and data – 5.6 MHz fixed / mobile for SDTV and LDTV – 5.6 MHz fixed for HDTV • Individual band segments can be allocated to separate

Ngày tải lên: 09/07/2014, 08:16

... University Orthogonal Frequency Division Multiple Access in WiMAX and LTE: A Comparison Group 4 – Trang 2 INTRODUCTION USE OF OFDMA IN WIMAX AND LTE  NETWORK ENTRY STEPS IN WIMAX AND LTE  PERFORMANCE ... with subtle differences.The main common technology is orthogonal frequency-division multiple access (OFDMA). - There are many good reasons for choosing OFDMA such as multipath handling capability, ... can be viewed asdiscrete Fourier transform (DFT)-spread OFDMA The data is passed through a DFT block before being input to the OFDMA module. Trang 6USE OF FREQUENCY DIVERSITYUSE OF OFDMA IN WIMAX

Ngày tải lên: 24/07/2015, 22:26

... station CDMA code division multiple access MSE mean square error CFO carrier frequency offset OFDM orthogonal frequency division multiplexing CP cyclic prefix OFDMA orthogonal frequency division multiple ... DFT discrete Fourier transform P/S parallel to sequential FDMA frequency division multiple access QPSK quaternary phase shift keying FFT fast Fourier transform SDMA space division multiple access ... time division multiple access MF matched filtering WiMAX worldwide interoperability microwave access viii Summary In current broadband evolution of wireless communications, Orthogonal Frequency Division

Ngày tải lên: 14/09/2015, 14:03

... Delay Diversity CDMA Code Division Multiple Access DFT Discrete Fourier Transform FDE Frequency Domain Equalizer FDMA Frequency Division Multiple Access FEC Forward Error Correcting ... TDMA/FDMA based Global System for Mobile Communications (GSM), which was first... systems, multiple access technologies based on orthogonal frequency division multiplexing (OFDM) air interface ... for Detection and Decoding of coded IFDMA System 36 2.7 Decoding Tree for S = 3, Q = 2 39 2.8 BER Performance Comparison for ZF QRD and MMSE QRD 46 2.9 BER Performance Comparison for

Ngày tải lên: 08/09/2015, 18:24

... on Wireless Communications and NetworkingVolume 2007, Article ID 20258, 11 pages doi:10.1155/2007/20258 Research Article Practical Quantize-and-Forward Schemes for the Frequency Division Relay ... quasistatic orthogonal relay channels for which orthogonality is defined accordingly to [1] Since the source-destination channel is assumed to be orthogonal to the relay-destination channel (i.e., the forward ... assertion can be proven for the two combiners pro-vided in this paper, for more information see [12]) There-fore, one has to keep in mind that in quasistatic channels the performance gain due to

Ngày tải lên: 22/06/2014, 00:20

... Manual for Optical Fiber Communications 4th Edition by Gerd Keiser https://getbooksolutions.com/download/solution-manual-optical-fibercommunications-4th-edition-by-keiser Gerd Keiser, Optical ... Fiber Communications, McGraw-Hill, 4th ed., 2011 Problem Solutions for Chapter E  100cos 210 t  30 e x  20cos 210 t  50 e y 2.1 2.2  40cos 2108 t  210 e z The general form is: ... 2108 t  210 e z The general form is: y = (amplitude) cos(t - kz) = A cos [2(t - z/)] Therefore (a) amplitude = m (b) wavelength: 1/ = 0.8 m-1 so that  = 1.25 m (c)  = 2(2) =

Ngày tải lên: 01/03/2019, 11:36

... It is evident that each frequency corresponds to a different wavelength This technique could be named either Frequency Division Multiplexing (FDM) or Wavelength Division Multiplexing (WDM) The ... 8ABSTRACT Technology of wavelength division multiplexing Telecommunications make wide use of optical techniques where the carrier wave belongs to the classical optical domain (Hình 1) The wave ... generally reserved for very close frequency spacings (typically less than 50 GHz corresponding to 0.4 nm) The terminology is not set in concrete With wavelength division multiplexing it is possible

Ngày tải lên: 16/04/2021, 04:29

... pattern, the described optical elements allow performing OAM-mode division demultiplexing (OAM-MDM) and spatial division mul-tiplexing (SDM) with the same optical platform Moreover, the directions ... OAM-mode division multiplexing are combined for further improvement of the information transmission capacity, in terms of bandwidth, of the optical link, both for free-space transmis-sion and optical ... and characterization of phase-only diffractive optical elements (DOE) performing mode-division (de) multiplexing (MDM) and spatial-division (de)multiplexing (SDM) at the same time Samples have

Ngày tải lên: 24/11/2022, 17:46

... that are to be used to perform the particular function such as • How to format the source information stream • How to detect transmission errors • How to handle errors • For each function, both ... streams are multiplexed together for transmission over the network • Time division multiplexing (TDM) technique is normally used H.324 • The H.324 standard is intended for use in a PSTN Video • Options: ... audio and video streams are formatted into packets for transfer over the network using the real-time transport protocol (RTP). • RTP is for the transfer of real-time information • At the head of

Ngày tải lên: 06/09/2013, 07:50

... evolving field for telecommunications, computer, and mediaindustries In particular, for real time video compression applications a growing economical signifi-cance is expected for the next years ... power required for the discrete cosinetransform and motion estimation, these algorithms are the first candidates for a dedicated imple-mentation As typical examples, alternatives for a dedicated ... arediscussed in the following The discrete cosine transform (DCT) is a real-valued frequency transform similar to the DiscreteFourier transform (DFT) When applied to an image block of size L× L,

Ngày tải lên: 25/10/2013, 02:15

... languages is investigated for minimum the DSP’s measurement time The steps of Monte Carlo simulations embedded into the DSK’s flash through the DSK’s JTAG interface for optical parameters measurement ... 50% • Optical parameters measurement setup: Fig 7 Optical parameter measurement based on MC simulations and DSP Trang 7Fig 8 Interfaces between the ADC, the DSP and the PC The flowchart for data ... the flowchart of photon movement in a biological sample Fig 2 Flowchart for Monte Carlo simulations Monte Carlo simulations for biological samples begin by photon stepsize and photon weighting

Ngày tải lên: 28/03/2014, 13:20

... model.
Describe the importance of addressing and naming schemes in network communications. Trang 3The Platform for CommunicationsTrang 4Elements of CommunicationTrang 5Communicating the Messages00101010100101010101010101010101010 ... network, including the devices and media that are necessary for successful communications.
Explain the function of protocols in network communications.
Explain the advantages of using a layered ... or both Software determines the role.
Servers provide information and services to clients e-mail or web pages
Clients request information from the server Server Trang 14Intermediary Devices

Ngày tải lên: 01/04/2014, 12:20

... ELECTROTECHNICAL COMMISSION –––––––– CONNECTORS FOR OPTICAL FIBRES AND CABLES – Part 14-4: Detail specification for fibre optic adaptor (simplex) type SC for multimode fibre FOREWORD 1) The IEC (International ... 910004XX0004 First edition 1997-06 Connectors for optical fibres and cables – Part 14-4: Detail specification for fibre optic adaptor (simplex) type SC for multimode fibre Commission Electrotechnique ... 910004XX0004 First edition 1997-06 Connectors for optical fibres and cables – Part 14-4: Detail specification for fibre optic adaptor (simplex) type SC for multimode fibre Reference number IEC 60874-14-4:1997(E)

Ngày tải lên: 04/04/2014, 11:52

... Dissimilar uplink/ downlink modulation? frequency band Uplink frequency band Downlink frequency Trang 22required at both mobile and base stations for both forward and reverse linktransmissions ... levels than a nonfading (static) channel for a similar level of per- sig-formance in terms of, for example, bit error rate (BER) To illustrate, BPSK BER for information transmitted over a fading channel ... N infor-2.3.1 FH-SS An FH-SS system is similar to a frequency shift keyed (FSK) modulation The difference is that in FSK systems two frequency tones are used for the lation of 1 and 0 information,

Ngày tải lên: 27/05/2014, 04:01

... carrier frequency domain equalization (SCFDE) over a diffuse optical wireless (DOW) communications. Recently orthogonal frequency division multiplexing (OFDM) has been applied to DOW communications. However, ... receivers for optical signals. These opto electronic devices are cheaper as compared to RF equipments. Orthogonal frequency division multiplexing (OFDM) modulation is a promising modulation scheme for ... the OFDM systems for DOW transmission, the asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) [7]hasbeen shown to be more efficient in terms of optical power than the...

Ngày tải lên: 21/06/2014, 08:20

... 9 Elementary decoder for row 1 Elementary decoder for row 2 Elementary decoder for row N Elementary decoder for column 1 Elementary decoder for column 2 Elementary decoder for column N Elementary decoder for ... signals Elementary decoder for row 1 Elementary decoder for row 2 Elementary decoder for row N Elementary decoder for column 1 Elementary decoder for column 2 Elementary decoder for column N FPGA XC5VLX330 Connection ... signals Elementary decoder for row 1 Elementary decoder for row 2 Elementary decoder for row N Elementary decoder for column 1 Elementary decoder for column 2 Elementary decoder for column N SERDES...

Ngày tải lên: 21/06/2014, 23:20