total access communication system

... developed the AMPS communications system in the late 1970s [BEL-79]. The AMPS system was introduced into commercial service in 1983 by AT&T with a 3-month trial in Chicago. The system operates ... system to be investigated. The evolution of mobile communications can be categorised into generations of develop- ment. Presently, we are on the verge of the third-generation (3G) of mobile systems. ... wireless-local area network (W- LAN) solutions. 2G systems are synonymous with the globalisation of mobile systems, and in Mobile Satellite Communication Networks. Ray E. Sheriff and Y. Fun Hu Copyright...

Ngày tải lên: 14/09/2012, 11:26

... Multiple Access SSN Subsystem Number SSN7 Signalling System Number 7 SSPA Solid State Power Amplifier STP Service Transfer Part STP Service Transfer Point SUITED Multi-Segment System for Ubiquitous Access ... Satellite System GOCC Ground OCC GPM Gross Potential Market GPRS General Packet Radio Service GPS Global Positioning System GRAN Generic Radio Access Network GSC Gateway Station Control GSM Global System ... Adapter TA Timing Advance TACCH Terminal-to-Terminal Associated Control Channel TACS Total Access Communications System TCE Traffic Channel Equipment TCH Traffic Channel TCH/F Full-Rate Traffic Channel TCH/H...

Ngày tải lên: 14/09/2012, 11:26

... II trong sách “Principles of Digital Communication Systems and Computer Networks” của nhóm em. Phần I – Các hệ thống truyền thông số (Digital Communation System) Chương 2: Lý Thuyết Thông Tin (Information ... sư truyền thông. Tài liệu tham khảo C. E. Shannon. "A Mathematical Theory of Communication. " Bell System Technical Journal, Vol. 27, 1948. Tất cả các kỹ sư truyền thông phải đọc bài ... 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 System Technical là cơ sở cho sự phát triển toàn...

Ngày tải lên: 18/09/2012, 10:13

... available. Call Systems Engineering for more information. 3 2/98 465 Soneplex ® Access Multiplexer System System Overview The Soneplex AM System provides a broad range of service access options ... support costs. 22/98 465 Soneplex ® Access Multiplexer System The Soneplex Access Multiplexer System breaks the barrier between customer and carrier networks by being the first to integrate LAN support into SONET access ... Provider Soneplex AM STD High Rise Building Soneplex AM STD PBX 62/98 465 Soneplex ® Access Multiplexer System Soneplex Access Multiplexer Chassis Soneplex AM-STD Shelf kit Soneplex AM-Micro Shelf Kit Soneplex...

Ngày tải lên: 10/12/2013, 16:15

Ngày tải lên: 12/12/2013, 04:15

Ngày tải lên: 20/12/2013, 19:15

... digital lightwave systems employ OOK in combination with PCM. 1.3 Optical Communication Systems As mentioned earlier, optical communication systems differ in principle from mi- crowave systems only ... optical communication system. It consists of a transmitter, a communication channel, and a receiver, the three elements common to all communication systems. Optical communication systems can be clas- sified ... communication systems currently use optical fibers, the commonly used term for them is fiber-optic communication systems. The term lightwave system is also sometimes used for fiber-optic communication systems, although...

Ngày tải lên: 24/12/2013, 01:16

... powers in optical communication systems are typically below 10 mW, SRS is not a limiting factor for single-channel lightwave systems. However, it affects the performance of WDM systems considerably; ... modes, and radiation modes [14]. As one might expect, sig- nal transmission in fiber-optic communication systems takes place through the guided modes only. The following discussion focuses exclusively ... understanding [12]–[21]. This chapter focuses on the role of optical fibers as a communication channel in lightwave systems. In Section 2.1 we use geometrical- optics description to explain the...

Ngày tải lên: 24/12/2013, 01:16

... 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 ... transverse modes. [85]. In the absence of fiber dispersion, MPN would be harmless for optical communication systems, as all modes would remain synchronized during transmis- sion and detection. However, ... because of a short recombination time associated with stimulated emission. Most fiber-optic communication systems use semiconductor lasers as an optical source because of their superior performance...

Ngày tải lên: 24/12/2013, 01:16

... nonetheless useful for optical communication systems simply because of their higher sensitivity. Receiver sensitivity is an important issue in the design of lightwave systems and is discussed next. 4.5 ... Forrest, in Optical Fiber Telecommunications II, S. E. Miller and I. P. Kaminow, Eds., Academic Press, San Diego, CA, 1988, Chap. 14. [5] B. L. Kasper, in Optical Fiber Telecommunications II, S. E. ... 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 II, S. E....

Ngày tải lên: 24/12/2013, 01:16

... third-generation systems operating near 1.55 µ m and can exceed 100 (Tb/s)-km for the fourth-generation systems. 5.1.2 Distribution Networks Many applications of optical communication systems require ... constitute a basic element of all communication systems, including LANs, MANS, and other distribution networks. 5.2 Design Guidelines The design of fiber-optic communication systems requires a clear understanding ... bandwidth offered by fiber-optic communication systems. The main difference between MANs and LANs is related to the random access of- fered to multiple users of a LAN. The system architecture plays...

Ngày tải lên: 24/12/2013, 01:16

Ngày tải lên: 24/12/2013, 14:16

... Conclusions 23 25 25 25 26 26 27 27 4 SYSTEM MODELING 4.1 Introduction 4.2 OptiSystem Software 4.3 System Model in OptiSystem 4.4 System Components 4.4.1 IsOWC Transmitter Design ... 4.3 System Model in OptiSystem Several designs were built to obtain the optimum design for the IsOWC system. Based on the basic IsOWC block diagram presented in Chapter 2, the system ... 2, the system is modeled with basic communication subsystems as stated in the project’s scope of work. The first design consists of basic OWC communication system and is shown in Figure 4.1....

Ngày tải lên: 19/01/2014, 07:20

... 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 System Single-Carrier ... 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 ... every linear code is equivalent to a systematic linear code [1]. Therefore, systematic block codes are the standard choice and are assumed henceforth. Some systematic codewords have only one nonzero...

Ngày tải lên: 20/01/2014, 06:20

... along the link in such a way that the total dispersion over the entire link length was quite small at the operating wavelength of 1.55 µ m. By 1992, the total system length could be increased to ... the nonlinear effects then limits the system length L T [134]–[147]. For single-channel systems, the most dominant nonlinear phenomenon that limits the system performance is self-phase modulation ... L A , Fig. 6.22 shows the total system length L T as a function of L A for several values of input powers P in assuming that an electrical SNR of 20 dB is required for the system to function properly...

Ngày tải lên: 21/01/2014, 06:20

... compensated using DCFs [138]. 7.9 High-Capacity Systems Modern WDM lightwave systems use a large number of channels to realize a system capacity of more than 1 Tb/s. For such systems, the dispersion-management ... dispersion-managed systems [184]–[196]. Before considering the techniques used for PMD compensation, we provide an order-of-magnitude estimate of the system length in uncompensated systems. Equa- tion ... interval, the system will stop functioning properly; this is referred to as fading or outage in analogy with a similar effect occurring in radio systems [184]. The performance of a PMD-limited system...

Ngày tải lên: 21/01/2014, 06:20

Ngày tải lên: 21/01/2014, 06:20

Ngày tải lên: 21/01/2014, 06:20

Ngày tải lên: 21/01/2014, 06:20

Ngày tải lên: 17/02/2014, 20:20