wireless optical communication systems ppt

... the potential capabilities of spread- spectrum communication systems. Although direct-sequence systems greatly suppress interference, practical systems require channel codes to deal with the residual ... Probability Complex-Valued Quaternary Sequences 6.2 Systems with Random Spreading Sequences Direct-Sequence Systems with PSK Quadriphase Direct-Sequence Systems 6.3 Wideband Direct-Sequence Systems Multicarrier Direct-Sequence ... Field Long Nonlinear Sequences 2.3 Systems with PSK Modulation Tone Interference at Carrier Frequency General Tone Interference Gaussian Interference 2.4 Quaternary Systems 2.5 Pulsed Interference 2.6 Despreading...

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Ngày tải lên: 12/12/2013, 04:15

... 1.55- µ m optical communication systems operating at bit rates of 2.5 Gb/s or more. DFB lasers are reliable enough that they have been used since 1992 in all transoceanic lightwave systems. 3.4.2 ... limit the performance of optical communication systems, especially when β 2 C > 0, where β 2 is the dispersion parameter 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 source because of their superior performance compared with LEDs....

Ngày tải lên: 24/12/2013, 01:16

... Optic Communication Systems, 3rd Ed., Wiley, 2002. B. F. Jorgensen, B. Mikkelsen and C. J. Mahon, “Analysis of optical amplifier noise in co- herent optical communication systems with optical ... Digital Communications. According to the program of the workshop, the book is divided into four parts: Information and Communication Theory for Optical Communications. This first part examines optical ... methods. Key words: optical Kerr effect; optical fiber nonlinearity; nonlinear distortion; optical fiber theory. 1. INTRODUCTION The nonlinear Schrödinger equation governs the propagation of the optical field...

Ngày tải lên: 20/01/2014, 06:20

... 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 receivers by ... example, ∆ ν g ∼5 THz for semiconductor optical amplifiers for which T 2 ∼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...

Ngày tải lên: 21/01/2014, 06:20

... Chapter 6 that with the advent of optical amplifiers, fiber losses are 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 1.55 µ m and using optical transmitters containing a distributed feedback (DFB) laser. Such systems generally use the existing fiber-cable ... terrestrial lightwave systems but is reduced to about 50 km for submarine systems. Because of cost considerations, most laboratory experiments use a fiber loop in which the optical signal is forced...

Ngày tải lên: 21/01/2014, 06:20

... Persoinick, Eds., Coherent Lightwave Communications, IEEE Press, 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]. 484 CHAPTER 10. COHERENT LIGHTWAVE SYSTEMS invariably occur...

Ngày tải lên: 21/01/2014, 06:20

... +1)e j2πft df = 1 2j  1 j2πt fe j2πft + 1 4π 2 t 2 e j2πft      0 − 1 2 + 1 2j 1 j2πt e j2πft     0 − 1 2 − 1 2j  1 j2πt fe j2πft + 1 4π 2 t 2 e j2πft      1 2 0 + 1 2j 1 j2πt e j2πft     1 2 0 = j  − 1 4πt sin πt + 1 4π 2 t 2 (cos πt − 1)  38 SOLUTIONS MANUAL Communication Systems Engineering Second Edition John G. Proakis Masoud Salehi Prepared by Evangelos Zervas Upper...

Ngày tải lên: 05/03/2014, 19:20

... write ∞  n=−∞ |x n | 2 = −M  n=−∞ |x n | 2 + M  n=−M |x n | 2 + ∞  n=M |x n | 2 7 SOLUTIONS MANUAL Communication Systems Engineering Second Edition John G. Proakis Masoud Salehi Prepared by Evangelos Zervas Upper...

Ngày tải lên: 28/03/2014, 17:20

... interferers in wireless communications. IEEE Trans. Signal Process. 51, 64–76 (2003) [4] AV Nikitin, On the impulsive nature of interchannel interference in digital communication systems, in Proceedings ... has no competing interests. References [1] K Slattery, H Skinner, Platform Interference in Wireless Systems (Elsevier, Amsterdam, 2008) [2] F Leferink, F Silva, J Catrysse, S Batterman, V Beauvois, ... Introduction Nowadays, it is becoming more and more common that multiple digital communication devices, including wireless, coexist and concurrently operate in close physical proximity. A typical...

Ngày tải lên: 20/06/2014, 04:20

... systems with random signature sequences,” IEEE Transactions on Communications, vol. 37, no. 10, pp. 1052–1061, 1989. [35] J. C. Liberti Jr . and T. S. Rappaport, Smart Antennas for Wireless Communications: ... the IEEE Military Communications Conference (MILCOM ’91), vol. 2, pp. 571–575, McLean, Va, USA, November 1991. [33] R. E. Ziemer and W. H. Tranter, Principles of Communications: Systems, Modulation, ... remote sensing systems, ” WSEAS Transactions on Signal Processing, vol. 2, no. 1, pp. 203–208, 2005. [29]V.Tuzlukov,W.S.Yoon,andY.D.Kim,“Adaptivebeam- former generalized detector in wireless sensor...

Ngày tải lên: 21/06/2014, 05:20

... and modulation schemes used in telecommunication systems (2G/3G and 4G). In particular, ADMR has g ained a great attention in military applications, such as communication intelligence (COMINT), ... 2004. [7]A.K.NandiandE.E.Azzouz,“Algorithmsforautomatic modulation recognition of communication signals,” IEEE Transactions on Communications, vol. 46, no. 4, pp. 431–436, 1998. [8] A. Swami and B. M. ... QAM modulation classification algorithm using cyclic cumulants,” in Proceedings of the IEEE Wireless Communications and Networking Conference (WCNC ’04), pp. 745–748, 2004. [10] B. G. Mobasseri,...

Ngày tải lên: 21/06/2014, 16:20

... European Wireless Conference, Paris, France, April 2007. [34] P. Almers, E. Bonek, A. Burr, et al., “Survey of Channel and Radio Propagation Models for WirelessMIMO Systems, ” EURASIP Journal on Wireless ... Implementation of Network MIMO for Indoor Wireless Systems Sivarama Venkatesan, 1 Howard Huang, 1 Angel Lozano, 2 andReinaldoValenzuela 1 1 Wireless Communications Research Bell Labs, Alcatel-Lucent ... International Conference on Communications (ICC ’08), pp. 4106–4110, May 2008. [23] E. Aktas, J. Evans, and S. Hanly, “Distributed decoding in a cellular multiple-access channel,” IEEE Transactions on Wireless Communications,...

Ngày tải lên: 21/06/2014, 19:20

... within the “Cloud”. For this to happen the Cloud EURASIP Journal on Wireless Communications and Networking 7 IEEE Electronics and Telecommunications is currently developing a Ubiquitous Green Community ... Journal on Wireless Communications and Networking Volume 2009, Article ID 656785, 7 pages doi:10.1155/2009/656785 Research Article Green Networking for Major Components of Information Communication ... IEEE Standards Association, 2009, http://grouper.ieee.org/ groups/1888/. EURASIP Journal on Wireless Communications and Networking 5 must provide broadband bandwidth, security to users, and should...

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