wireless optical cdma communication systems
Principles of Digital Communication Systems and Computer Networks
... MSSV:08520582-TRƯƠNG VĂN VĨ MSSV:08520470Sau đây là bài dịch chương II trong sách “Principles of Digital Communication Systems and Computer Networks” của nhóm em.Phần I – Các hệ thống truyền thông số(Digital ... trọng cho mỗi kỹ sư truyền thông.Tài liệu tham khảoC. E. Shannon. "A Mathematical Theory of Communication. " Bell System Technical Journal, Vol. 27, 1948.Tất cả các kỹ sư truyền thông ... Shannon đặt nền móng về lý thuyết thông tin năm 1948. Cuốn sách của ông “A Maththemathical Theroy of Communication ” (Một lý thuyết toán học của sự truyền thông tin) được xuất bản trong Tạp chí Bell...
- 15
- 948
- 1
The Future of Wireless Banking Implementation of Wireless Banking and Financial Systems
... SphereDeviceIDUserProfileNotificationServicesSystemprocessingUpdateAlertServices Wireless DevicesNetworks /ProtocolsServiceProvidersCDPDGateway CDMA GatewayArdisGatewayGSMGateway3- Wireless Middleware (Application server engine) Wireless application ... manner.The Future of Wireless BankingImplementation of Wireless Banking and Financial Systems Rod GhaniSenior ConsultantIBM Global Services03/15/2001The Future of Wireless BankingRon Ghani12The ... service provider to another. Themost challenging issue about the wireless systems is coverage.As end users sign up with WSP (Wireless Service Providers), they quickly come to realize that thepackages...
- 16
- 562
- 0
Tài liệu Fibre optic communication systems P1 doc
... of the resulting optical signal. Most digital lightwave systems employ OOK incombination with PCM.1.3 Optical Communication Systems As mentioned earlier, optical communication systems differ ... Willner, Optical Fiber Communication Systems, ArtecHouse, Norwood, MA, 1996.[38] R. Papannareddy, Introduction to Lightwave Communication Systems, Artec House, Nor-wood, MA, 1997.[39] K. Nosu, Optical ... limitingvalue, optical communication systems have the potential of carrying information atbit rates ∼1 Tb/s. It is this enormous potential bandwidth of optical communication systems that is...
- 22
- 403
- 1
Tài liệu Fibre optic communication systems P2 pdf
... channel powers in optical communication systems are typically below 10 mW, SRSis not a limiting factor for single-channel lightwave systems. However, it affects theperformance of WDM systems considerably; ... fiber-optic communications.Several books devoted entirely to optical fibers cover numerous advances made in theirdesign and understanding [12]–[21]. This chapter focuses on the role of optical fibersas ... lightwave systems. It is often used for de-multiplexing individual channels when time-division multiplexing is used in the optical domain. It can also be used for wavelength conversion. FWM in optical...
- 54
- 319
- 1
Tài liệu Fibre optic communication systems P3 pptx
... 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 1992in all transoceanic lightwave systems. 3.4.2 ... limit the performance of optical communication systems, especially whenβ2C > 0, whereβ2is the dispersionparameter and C is the chirp parameter. Even though optical pulses emitted from ... recombination time associated with stimulated emission.Most fiber-optic communication systems use semiconductor lasers as an optical sourcebecause of their superior performance compared with LEDs....
- 56
- 371
- 1
Tài liệu Fibre optic communication systems P4 doc
... 14.[5] B. L. Kasper, in Optical Fiber Telecommunications II, S. E. Miller and I. P. Kaminow,Eds., Academic Press, San Diego, CA, 1988, Chap. 18.[6] S. B. Alexander, Optical Communication Receiver ... G. Swartz, in Optical Fiber Telecommunications II, S. E. Miller and I. P. Kaminow,Eds., Academic Press, San Diego, CA, 1988, Chap. 20.[54] K. Kobayashi, in Optical Fiber Telecommunications ... nonetheless useful for optical communication systems simply because of their higher sensitivity. Receiver sensitivity is an importantissue in the design of lightwave systems and is discussed...
- 50
- 338
- 1
Tài liệu Fibre optic communication systems P5 doc
... third-generation systems operating near 1.55µm andcan exceed 100 (Tb/s)-km for the fourth-generation systems. 5.1.2 Distribution NetworksMany applications of optical communication systems require ... 1993.[4] I. P. Kaminow and T. L. Koch, Eds., Optical Fiber Telecommunications III, AcademicPress, San Diego, CA, 1997.[5] G. E. Keiser, Optical Fiber Communications, 3rd ed., McGraw-Hill, New ... Gnauck, in Optical Fiber Telecommunications II,S.E. Miller and I. P. Kaminow, Eds., Academic Press, San Diego, CA, 1988, Chap. 21.[2] S. E. Miller and I. P. Kaminow, Eds., Optical Fiber Telecommunications...
- 43
- 321
- 1
Tài liệu PRINCIPLES OF SPREAD-SPECTRUM COMMUNICATION SYSTEMS ppt
... the potential capabilities of spread-spectrum communication systems. Although direct-sequence systems greatlysuppress interference, practical systems require channel codes to deal with theresidual ... ProbabilityComplex-Valued Quaternary Sequences6.2 Systems with Random Spreading SequencesDirect-Sequence Systems with PSKQuadriphase Direct-Sequence Systems 6.3Wideband Direct-Sequence Systems Multicarrier Direct-Sequence ... FieldLong Nonlinear Sequences2.3 Systems with PSK ModulationTone Interference at Carrier FrequencyGeneral Tone InterferenceGaussian Interference2.4Quaternary Systems 2.5Pulsed Interference2.6Despreading...
- 457
- 421
- 0
Tài liệu Fibre optic communication systems P6 ppt
... issues for long-haul systems employing a cascaded chain of optical amplifiers.6.5.1 Optical Preamplification Optical amplifiers are routinely used for improving the sensitivity of optical receiversby ... example, ∆νg∼5 THz for semiconductor optical amplifiers for which T2∼60 fs.Amplifiers with a relatively large bandwidth are preferred for optical communication systems because the gain is then nearly ... limitation on all long-haul systems designed with a cascaded chain of optical amplifiers [123]–[126].The physical origin of ASE-induced jitter can be understood by noting that optical amplifiers affect...
- 53
- 350
- 2
Tài liệu Fibre optic communication systems P7 ppt
... Chapter 6 that with the advent of optical amplifiers, fiber lossesare no longer a major limiting factor for optical communication systems. Indeed, mod-ern lightwave systems are often limited by the ... provided by the third-generation terrestrial systems operating near 1.55µmand using optical transmitters containing a distributed feedback (DFB) laser. Such systems generally use the existing fiber-cable ... terrestrial lightwave systems but isreduced to about 50 km for submarine systems. Because of cost considerations, most laboratory experiments use a fiber loop inwhich the optical signal is forced...
- 51
- 357
- 1
Tài liệu Fibre optic communication systems P8 docx
... toOTDM lightwave systems. 8.4.1 Channel MultiplexingIn OTDM lightwave systems, several optical signals at a bit rate B share the samecarrier frequency and are multiplexed optically to form ... Channel selection through a tunable optical filter.8.2 WDM ComponentsThe implementation of WDM technology for fiber-optic communication systems re-quires several new optical components. Among them ... case in which a tunable optical filter is used to select a single channelamong the N channels incident on it. If the optical filter is set to pass the mth channel,the optical power reaching the...
- 74
- 336
- 1
Tài liệu Fibre optic communication systems P9 pdf
... is preserved quite well even after416CHAPTER 9. SOLITON SYSTEMS 9.2.4 Soliton TransmittersSoliton communication systems require an optical source capable of producing chirp-free picosecond ... into an optical bit stream in the RZformat [53]. Although optical pulses launched from such transmitters typically do nothave the “sech” shape of a soliton, they can be used for soliton systems ... nonsolitonlightwave systems, remain the lasers of choice even for soliton systems. Early experiments on soliton transmission used the technique of gain switching forgenerating optical pulses of...
- 74
- 416
- 3
Tài liệu Fibre optic communication systems P10 ppt
... Persoinick, Eds., Coherent Lightwave Communications, IEEEPress, Piscataway, NJ, 1990.[15] S. Betti, G. de Marchis, and E. Iannone, Coherent Optical Communication Systems, Wi-ley, New York, 1995.[16] ... 1995.[16] S. Ryu, Coherent Lightwave Communication Systems, Artec House, Boston, 1995.[17] F. Heismann, S. K. Korotky, and J. J. Veselka, in Optical Fiber Telecommunications III,Vol. B, I. P. ... important for long-haul systems using cascaded optical am-plifiers [111]. Even XPM effects become significant in coherent FSK systems [112].484CHAPTER 10. COHERENT LIGHTWAVE SYSTEMS invariably occur...
- 40
- 378
- 1
Tìm thêm: hệ việt nam nhật bản và sức hấp dẫn của tiếng nhật tại việt nam xác định các mục tiêu của chương trình xác định các nguyên tắc biên soạn khảo sát chương trình đào tạo gắn với các giáo trình cụ thể xác định thời lượng học về mặt lí thuyết và thực tế tiến hành xây dựng chương trình đào tạo dành cho đối tượng không chuyên ngữ tại việt nam điều tra đối với đối tượng giảng viên và đối tượng quản lí khảo sát các chương trình đào tạo theo những bộ giáo trình tiêu biểu nội dung cụ thể cho từng kĩ năng ở từng cấp độ phát huy những thành tựu công nghệ mới nhất được áp dụng vào công tác dạy và học ngoại ngữ mở máy động cơ rôto dây quấn đặc tuyến hiệu suất h fi p2 đặc tuyến mômen quay m fi p2 đặc tuyến dòng điện stato i1 fi p2 động cơ điện không đồng bộ một pha sự cần thiết phải đầu tư xây dựng nhà máy thông tin liên lạc và các dịch vụ phần 3 giới thiệu nguyên liệu từ bảng 3 1 ta thấy ngoài hai thành phần chủ yếu và chiếm tỷ lệ cao nhất là tinh bột và cacbonhydrat trong hạt gạo tẻ còn chứa đường cellulose hemicellulose chỉ tiêu chất lượng 9 tr 25