By Andrew Miceli

ISBN-10: 1580530052

ISBN-13: 9781580530057

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Extra info for Wireless technician's handbook

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You may have heard of Walsh codes in CDMA. These Walsh codes are actually orthogonal sequences. 7 Modulation Modulation is the process of putting useful information on a carrier that can be transmitted from one point to another. Naturally, this information can be voice data or signaling data. 15 Logic gates common in cellular applications.  Any difference between the two signals would result in an area less than one. Pulse modulation; Phase modulation. Two of the more known forms of modulating voice are frequency modulation (FM) and amplitude modulation (AM).

As the 20th century unfolded, many applications, from television and radio to air and satellite communications began eating up this new domainfrequency spectrum. In the United States, the FCC needed to isolate and assign a band for this new and growing communications trend. As frequency goes up, it becomes more difficult to develop cellular communications systems, and many would agree that 10 GHz would be the upper limit. Thus, there is indeed a finite amount of bandwidth available, yet our scientists can come up with an infinite amount of applications to fill this bandwidth.

Differences between the created digital waveform and the actual voice waveform are called quantization errors. While this method can make for a high quality conversation, if the system requires 8 bits for each sample (as is the case for a standard called pulse code modulation, or PCM) it would require a data rate of 64 kbps, which would use too much bandwidth for most wireless systems. Adaptive differential pulse code modulation (ADPCM) uses much the same sampling process, but represents the samples differentially, that is, not as an absolute level, but rather as the difference from the last sample.

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Wireless technician's handbook by Andrew Miceli


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