March 2006
Beginner
216 pages
6h 56m
English
Content preview from Cellular Communications Explained
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that only the signal from the required BTS is recognized. With the movement of mobiles, signals
vary considerably, and it is possible that the signal from a nearby cell may be received suddenly.
The use of the training patterns enables the mobile to detect this.
The data, usually from the voice encoding, need to be split to fit the data structure. The speech is
broken into blocks of 20 ms, and this is processed by the speech coder to give 260 bits to represent
the speech. These are ordered and divided int o two groups. For full-rate speech, one group of
182 bits is passed through error correction and results in a string of 382 bits. The less critical group
of 78 bits is just summed with the error-corrected data to yield 482 bits. These are diago ...
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