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Note that locating requirements are equivalent to those typical of mobile networks. The functions carried out by the Agents are similar to those performed by the Location Registers in any given mobile network or between different mobile networks. Today, the spread of data services (chie¯y those based on IP) is increasingly interwoven with the spread of the concept of mobility. Clearly, in fact, the burgeoning growth of mobile communications is increasing marked ± and not just in the forecasts ± by keener interest in multimedia mobile communications, where data, voice and image connections can coexist in the same call.

By means of a lowpass ®lter, the signal's information-bearing component is then selected. In order to perform the despreading operation, the code must thus be known to the receiver in some way: for example, the mobile terminal may be noti®ed of the code via connection negotiation stage signalling. In addition, the code c(t) applied in reception must be synchronous with that used in transmission. Let us now suppose that jamming occurs, with narrow band interference superimposed on the transmitted signal.

1, all of the couples who are talking to each other in different languages (codes) will be able to continue their conversation providing that everyone speaks in a normal tone of voice. To make themselves heard better, one couple could decide to start shouting. In this way, however, they would cause a disturbance ± or in other words, interference ± which would prevent everyone else from continuing the communication. Hence, it is clear that the use of more power than necessary has the practical effect of annulling the cell's capacity.

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Spread Spectrum Methods for Wireless Communications IEEE ComMag

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