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in the formalism are a discrete sequence of events, stretchng infinitely into past and future. The two basic temporal operators, Happens and Done, are augmented by some operators for describing the structure of event sequences, in the style of dynamic logic (Harel, 1979).The two most important of these constructors are and ' ':

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High data rate communications are limited not only by noise, --butespecially with increas(ISI) ing symbolrates -often more significantly by the Inter Symbol Interference due to the memory of the dispersive wireless communications channel [317]. Explicitly, this channel memory is caused by the dispersive channel impulse response (CIR) due to the differentlength propagation paths between the transmitting and the receiving antennae. This dispersion effect could theoretically be measured by transmitting an infinitely short impulse and receiving the CIR itself. On this basis, several measures of the effective duration of the impulse response can be calculated, one being the delay spread. The multipath propagation of the channel manifests itself by different echos of possibly different transmitted symbols overlapping at the receiver, which leads to error rate degradation. This effect occurs not only in wireless communications, but also over all types of electrical and optical wave-guides, although for these media the relative time differences are comparatively small, mostlydue to multi-mode transmission or incorrect electrical or optical termination at interfaces. In wireless communications systems the duration and the shapethe CIR depend heavof ily on the propagation environment of the communications system in question. While indoor wireless networks typically exhibit only short relative delays, outdoor networks, like the in Global System of Mobile communications (GSM)[ 131 can face delay spreads the order of

The next statemcnt specifies th at the plot is scm ilog. IV is the variable. and the ordinate is the angle of H , which though normally in rad /s is conve rt ed to degrees. The lise of the "unwrap" feature eliminates phase jumps from + 180 to - 180 degrees.

Following the present section, the remainder of this text focuses exclusively on sensing of naturally occuring incoherent elds (with the notable exception of our discussion of optical coherence tomography in Section 6.5). Prior to turning our attention away from coherent elds, however, we brie y turn our attention to holography. Holography is a form of optical interferometry invented by Gabor in 1948 [83] and substantially extended by many investigators after the invention of the

Proposed global IT architecture, strategy, standards and control processes map to these COBIT processes

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