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~~~~~~~~~> Does DEBT  become SERFDOM ?

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Wednesday, November 4, 2015

This glass could be as strong as steel | Fox News

This glass could be as strong as steel | Fox News



To solve that problem, the researchers came up with a technique that bypasses the container entirely and allows the chemical components to mix together in air. The end result is colorless, transparent and extremely durable glass.




Code division multiple access - Wikipedia, the free encyclopedia

Code division multiple access - Wikipedia, the free encyclopedia



CDMA is an example ofmultiple access, where several transmitters can send information simultaneously over a single communication channel. This allows several users to share a band of frequencies (see bandwidth). To permit this without undue interference between the users, CDMA employsspread-spectrum technology and a special coding scheme (where each transmitter is assigned a code).




CDMA Orthogonal Spreading Codes :: Radio-Electronics.Com

CDMA Orthogonal Spreading Codes :: Radio-Electronics.Com



The CDMA orthogonal spreading codes are one of the major elements within the whole CDMA system. The CDMA orthogonal spreading codes are combined with the data stream to be transmitted in such a way that the bandwidth required is increased and the benefits of the spread spectrum system can be gained.
The CDMA codes are specific to each channel / user so that the different users can gain access to the system and communicate as required.


Define FHSS AND explain how it achieves bandwidth spreading?

Define FHSS AND explain how it achieves bandwidth spreading?



"The frequency hopping spread spectrum (FHSS) technique uses M different carrier frequencies that are modulated by the source signal. At one moment, the signal modulates one carrier frequency; at the next moment, the signal modulates another carrier frequency."








List three benefits of spread spectrum.?

List three benefits of spread spectrum.?



(1) We can gain immunity from various kinds of noise and multipath distortion. (2) It can also be used for hiding and encrypting signals. Only a recipient who knows the spreading code can recover the encoded information. (3) Several users can independently use the same higher bandwidth with very little interference, using code division multiple access (CDMA)."




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