Communication Systems doc

Ngày tải lên: 24/12/2013, 14:16

... covers telecommunication fun- damentals, telecommunication network structures, advances in telecommunication systems, information superhighways, and newly developed telecommunication systems. In ... WM. X INTELLIGENT COMMUNICATION SYSTEMS telecommunication description methods that are easy to use, and human-friendly telecommunication environments. The intelligent c...

Ngày tải lên: 17/02/2014, 20:20

... 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 ... 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...

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 ... dependence of α for several semiconductor ma- terials commonly used to make photodetectors for lightwave systems. The wavelength λ c at which α becomes zero is called the cutoff wave...

Ngày tải lên: 24/12/2013, 01:16

... 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 ... possible for lightwave systems operating near 1.55 µ m. It is interesting to compare the loss limit of 0.85- µ m lightwave systems with that of electrical communicati...

Ngày tải lên: 24/12/2013, 01:16

... leaves the contents of the WDM signal intact. Chapter 8 Multichannel Systems In principle, the capacity of optical communication systems can exceed 10 Tb/s be- cause of a large frequency associated ... tunable optical filter. 8.2 WDM Components The implementation of WDM technology for fiber-optic communication systems re- quires several new optical components. Among them are multiplex...

Ngày tải lên: 21/01/2014, 06:20

... resolution issues 221 8.4.1 Narrowband systems 221 8.4.2 Wideband systems 221 8.4.3 Super-resolution techniques 222 8.4.4 UWB systems 225 8.5 UWB positioning and communications 227 8.5.1 Potential ... difference between the UWB and narrowband systems is the variation of major parameters with frequency. Due to this fact, working with UWB signals and systems usually demands more comple...

Ngày tải lên: 25/01/2014, 17:20

... contemporary economic systems include capitalist systems, socialist systems, and mixed economies. "Economic systems& quot; is the economics category that includes the study of respective systems. Currently ... I. ECONOMIC SYSTEMS 1. Definitions An economic system is the system of production, distribution and consumption ... wealth among other social objectives". 2. Type of...

Ngày tải lên: 25/10/2012, 16:12

Ngày tải lên: 12/12/2013, 04:15