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A little Smalltalk - download pdf or read online

By Timothy Budd

ISBN-10: 0201106981

ISBN-13: 9780201106985

Budd's advent to Smalltalk programming and the Little Smalltalk interpreter specializes in ordinary, instead of complex subject matters of object-oriented programming. The Little Smalltalk method runs less than the UNIX working approach and will be completed on traditional terminals.

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Sample text

For a wire antenna, the antenna length is for instance defined as D = λ2 , and hence the Fraunhofer distance follows dF = λ2 . 2. Main propagation mechanisms • Reflection: reflection takes place on obstacles of large dimensions with respect to wavelength. e. a surface where possible rough spots are small with respect to the wavelength), the reflection is said to be specular. In this case, the direction and the amplitude of the reflected ray are governed by the Snell-Descartes and Fresnel laws. When the surface separating the two materials presents non-negligible random rough spots, the reflection is called diffuse reflection.

In practice, the obstacles within the environment as well as the combination of multiple propagation paths lead to an additional attenuation of the 48 Ultra-Wideband Radio Propagation Channels transmitted waves. In general, this attenuation is a function of the distance d between the transmitter and the receiver. It is characterized by the path loss exponent Nd , the received signal power decreasing proportionally to d−Nd . The parameter Nd is equal to 2 in free space, and varies between 2 and 5 in NLOS configurations.

This configuration facilitates a very flexible management of the radio spectrum. Indeed, to avoid the jamming of any frequency band, we can forbid a series of carriers or the totality of a subband. This management can possibly be performed according to the legislation of the country of use or in a dynamic way according to the potential jammers. The management of the multi-users of the same group of subbands is performed using time-frequency code techniques. In a group of subbands, the communication of a given user regularly hops from one band to another, according to a cycle of approximately 1 μs duration.

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A little Smalltalk by Timothy Budd

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