wireless optical cdma communication systems

... of Multicarrier CDMA and Space-Time Coding 29 2.1 Combining DS-CDMA and OFDM 30 2.1.1 DS-CDMA 30 2.1.2 OFDM 33 2.2 Multicarrier CDMA Systems 38 2.2.1 MC-CDMA 38 2.2.2 MC-DS-CDMA 42 2.2.3 ... MULTICARRIER CDMA COMMUNICATION SYSTEMS HU XIAOYU NATIONAL UNIVERSITY OF SINGAPORE 2005 Trang 2ON THE PERFORMANCE AND CAPACITY OF SPACE-TIME BLOCK CODED MULTICARRIER CDMA COMMUNICATION SYSTEMS ... shown that multicarrier CDMA offers high spectral efficiency, robustness and flexibility Three different systems exist, namely MC-CDMA, MC-DS-CDMA and multitone (MT-) CDMA MC-CDMA is based on a serial

Ngày tải lên: 16/09/2015, 15:54

... (CDMA): An Overview 6 1.4.1 Motivation for CDMA 6 1.4.2 Basic Synchronous CDMA Model 7 1.4.3 Basic Asynchronous CDMA Model 8 1.5 Limitations of Conventional CDMA System 9 Trang 41.5.1 Multiple ... Multiple-Access (CDMA): An Overview 1.4.1 Motivation for CDMA The code-division multiple-access (CDMA) scheme was developed mainly to increase capacity The development of the digital cellular systems ... fundamentals of spread spectrum communications and a detailed look at the pros and cons of CDMA which is fast becoming the accepted standard for the next generation of wireless communications Chapter

Ngày tải lên: 28/11/2015, 13:33

... pagesdoi:10.1155/2011/913189 Research Article Signal Processing by Generalized Receiver in DS-CDMA Wireless Communication Systems with Optimal Combining and Partial Cancellation Vyacheslav Tuzlukov School ... interference cancellation (PPIC) using GR employed by direct-sequence code-division multiple access (DS-CDMA) systems under multipath fading channel in the case of periodic code scenario is proposed Optimal ... is very close to potentially achieved one and surpasses the BER performance of real PCF for DS-CDMA systems discussed in the literature 1 Introduction In this paper, we investigate the generalized

Ngày tải lên: 21/06/2014, 05:20

... 18A Brief History of Wireless Optical Communications 5Figure 1.1 An indoor wireless optical communication system. Figure 1.1 presents a diagram of a typical indoor wireless optical cations scenario ... studies‚electronics design‚ communications systems design among others The focus commu-of this text is on the design commu-of communications systems for indoor wirelessoptical channels Signalling ... directed wireless optical links can be large and allowsfor the transmission of large amounts of information, especially in short rangeapplications avail-Indoor wireless optical communication systems

Ngày tải lên: 23/10/2015, 20:19

... the optical signal passes thecascaded optical amplifers The power ratio between optical signal and optical noise is called as optical signal to noise ratio (OSNR), which is a key parameter in opticalfiber ... the physical layer of optical fiber transmission systems [1] Optical performancemonitoring (OPM) offers a great assistance to optical impairment management intransmission systems, which is potential ... performance ofoptical transmission systems In the optical transmission channel, additive spontaneousemission noise (ASE) generated by optical amplifier and chromatic dispersion (CD) ofoptical fiber

Ngày tải lên: 09/09/2015, 08:17

... FORMATS IN COHERENT OPTICAL COMMUNICATION SYSTEMS ZHANG HONGYU NATIONAL UNIVERSITY OF SINGAPORE Trang 2STUDY ON ADVANCED MODULATION FORMATS IN COHERENT OPTICAL COMMUNICATION SYSTEMSZHANG HONGYU ... Detection Systems Coherent optical communication systems started to attract extensive attention in the 1980s Since that time, the homodyne receiver is mainly used in coherent optical systems Next ... extensive attention in coherent optical communications, since they can achieve a high spectral efficiency (SE) One major issue in coherent optical communication systems is to recover carrier phase,

Ngày tải lên: 09/09/2015, 10:15

... support optical communication In the specific area of measurement technology of optical fiber sensor and communication systems, great demands are needed in the market For example, in optical communication ... TECHNIQUES IN OPTICAL FIBER SENSOR AND COMMUNICATION SYSTEMS HU JUNHAO NATIONAL UNIVERSITY OF SINGAPORE 2011 Trang 2ADVANCED MEASUREMENT TECHNIQUES IN OPTICAL FIBER SENSOR AND COMMUNICATION SYSTEMS ... world is becoming a truly global village after implementing optic fiber in optical communication systems These telecommunication links between the countries provide us low price, high speed and

Ngày tải lên: 10/09/2015, 08:41

... radio systems and has been adopted by the wireless telecommunication industry for many years Driven by consumer demand for different services, the development and emergence of new wireless communication ... spectrum scarcity poses an imminent problem for the development of future wireless communication systems Trang 14The Federal Communications Commission (FCC) established the Spectrum Policy Task Force ... the systems are heavily loaded Bluetooth Wireless  USB Bluetooth, Zigbee UWB Fig 1.2 Co-located radio systems which operate in the unlicensed band Trang 17The future challenge for radio systems

Ngày tải lên: 11/09/2015, 09:09

... Trang 1WIRELESS COMMUNICATION SYSTEMSBIN DA NATIONAL UNIVERSITY OF SINGAPORE 2010 Trang 2BIN DAAll Rights Reserved Trang 3WIRELESS COMMUNICATION SYSTEMSBIN DA (B.Eng, HHU) ... RRA 1.1 Evolution of wireless communication systems Due to the fast development of digital signal processing and very large scale integratedcircuits, wireless communication systems have been experiencing ... enable improvement in ical layer performance of modern wireless communication systems as compared withsingle-antenna systems [17] In MIMO systems, multiple antennas are used at both thetransmitter

Ngày tải lên: 11/09/2015, 10:15

... BROADBAND WIRELESS COMMUNICATION SYSTEMS VIAEXPECTATION MAXIMIZATION (EM) BASED ALGORITHMS THE-HANH PHAM NATIONAL UNIVERSITY OF SINGAPORE 2007 Trang 2ITERATIVE RECEIVER DESIGN FOR BROADBAND WIRELESS COMMUNICATION ... 6.2 Future works 107 Trang 8CONTENTSTrang 9Wireless communication systems are good choices to satisfy the growing demands onhigh-rate, high-quality communications for today’s users Due to the ... for CDMA 845.8 BER v.s number of iterations for BI-GDFE and EM for MC-CDMA 855.9 The MSE performance of MC-CDMA 855.10 BER v.s SNR for different iterations of BI-GDFE and EM for CP-CDMA

Ngày tải lên: 12/09/2015, 08:19

... coherent optical communication systems draw considerable attention andwere intensively investigated in 1980s The LO in the receiver dramatically im- Trang 291.1 Review of Coherent Optical Communicationproves ... of cloud computing also requires high speeddata communication within data-centers and high performance computers [3].The optical communication systems can be divided into two categories based ... Fiber-optic communication systems are lightwave systems that employ opticalfibers for information transmission The carrier frequencies for optical commu-nication systems are in the range of 100 THz which

Ngày tải lên: 12/09/2015, 09:28

... Trang 1CO-EXISTENCE OF WIRELESS COMMUNICATION SYSTEMS IN ISM BANDS: AN ANALYTICAL STUDY WANG FENG (B.Eng) A THESIS SUBMITTED FOR THE ... signal-to-noise ratio TDD time division duplex WLAN wireless local area network WPAN wireless personal area network Trang 11LIST OF FIGURES Figure 1.1 A ubiquitous wireless networking structure Figure 1.2 ... replacement applications Bluetooth is ideal for applications such as wireless headsets, wireless synchronization of PDAs with computers, and wireless peripherals such as printers or keyboards WLAN and

Ngày tải lên: 12/09/2015, 10:21

... TwoDOS Systems 4 1.1.2 Challenges in MIMO-OFDM Systems 7 1.2 Optical Storage Systems 8 1.2.1 Historical Overview 8 1.2.2 Detection in Optical Storage Systems 10 1.3 Wireless ... techniques developed in this thesis pertain to two different systems: opticalstorage and wireless communication systems Optical storage systems tend to have welldefined channel characteristics because ... coefficients ishighly important in wireless communication systems Therefore, we focus on developingchannel estimation techniques for wireless communication systems The application weconsider

Ngày tải lên: 14/09/2015, 14:12

... experimental validation of current wireless communication systems • Second, we propose a novel interleaved domain IDMA architecture applicable to cur-rent wireless communication standards The proposed ... ON MULTI-USER MIMO WIRELESS COMMUNICATIONSYSTEMS Tran Thi Thao Nguyen Trang 21.1 Background 8 1.2 Research Objectives 11 1.3 Thesis Hierarchy 13 2 Multi-User MIMO Wireless System Overview ... transceiver systems as well as their ability to employ the practical implementation To apply enhanced systems for future standards, the wireless channel emulator is portant to test the systems It

Ngày tải lên: 11/07/2021, 16:34

... RELIABILITY IN MULTI- ANTENNA WIRELESS COMMUNICATION SYSTEMS 1.1 Overview of multi-antenna wireless communication systems The traditional multi-antenna communication systems are shown in Figure ... enhance the security and reliability of multiple-antenna systems to ensure safe and trustworthy communication Security for wireless communication systems mostly depends on traditional encryption methods ... overview of traditional antenna wireless communication systems, focusing on key components including encryption, channel coding, and wireless channel modeling Current systems often adopt conventional

Ngày tải lên: 03/07/2025, 10:12

... Polarization Control Many wireless communication systems require a high degree of polarization control in order to optimize system performance For antennas to be fully exploited in such systems, high polarization ... transducer for radiating or receiving electromagnetic waves, is a critical component in wireless communication systems The history of antennas date back to 1886 when Professor Heinrich Rudolph Hertz ... Trang 1BROADBAND DESIGN OF DUAL AND CIRCULARLY POLARIZED ANTENNAS FOR WIRELESS COMMUNICATION SYSTEMS KHOO KAH WEE JONATHAN (B.Eng (Hons), NUS) A THESIS SUBMITTED FOR THE DEGREE

Ngày tải lên: 02/10/2015, 12:56

... commu-nication channel The major component of optical transmitters is an optical source.Fiber-optic communication systems often use semiconductor optical sources such aslight-emitting diodes (LEDs) ... Trang 1Chapter 3Optical Transmitters The role of the optical transmitter is to convert an electrical input signal into the responding optical signal and then launch it into the optical fiber serving ... 1.55-µm optical communication systems operating at bit rates of2.5 Gb/s or more DFB lasers are reliable enough that they have been used since 1992 periodic-in all transoceanic lightwave systems

Ngày tải lên: 24/12/2013, 01:16

... of an optical receiver depends on the modulation format used by the mitter Since most lightwave systems employ the binary intensity modulation, we focus trans-in this chapter on digital optical ... case of optical transmitters (Section 3.4), packaging of optical ceivers is also an important issue [75]–[79] The fiber–detector coupling issue is quitecritical since only a small amount of optical ... incident optical power It is useful to introduce the concept of rise time T r, defined as the time over which the current builds up from 10 to 90% of its final value when the incident optical

Ngày tải lên: 24/12/2013, 01:16

... 1Chapter 5Lightwave Systems The preceding three chapters focused on the three main components of a fiber-opticcommunication system—optical fibers, optical transmitters, and optical receivers Inthis ... third-generation systems operating near 1.55µm andcan exceed 100 (Tb/s)-km for the fourth-generation systems 5.1.2 Distribution Networks Many applications of optical communication systems require ... and then converts de-it back into optical form by modulating an optical source Fiber losses can also becompensated by using optical amplifiers, which amplify the optical bit stream directlywithout

Ngày tải lên: 24/12/2013, 01:16

... electrical communication systems The book departs from the usual format in two major respects First, the text does not cover analog or pulse modulation systems Only digital communication systems ... [22] Although the theorem has little application to ordinary radio communication systems, it is important in optical communication systems, antenna theory, picture processing, image enhancement, ... Communications Magazine, Vol 21, No 1, January 1983, pp 4-10 (2] Couch, II, L W., Digital and Analog Communication Systems, Macmillan Publishing Co., Inc., New York, 1983 {3] Carlson, A B., Communication

Ngày tải lên: 24/12/2013, 14:16