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Post by Akhil Kumar on May 2, 2013 3:45:41 GMT
Data whitening is used for adding a white noise in the bit stream to avoid the redundant bit sequence, but how redundant sequence of data bits (only 0s or only 1s) affects (or kills) the RF transmission? And how DC bias is reduced using Data whitening?
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srishtansh
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can contact me at : srishtanshp@nanopowercommunications.com
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Post by srishtansh on May 2, 2013 8:37:19 GMT
from a radio point of view data can be considered as random data flow with logic 1s and 0s alternating in a random manner. Such data ensures smooth
power distribution over the occupied bandwidth.
Ideally the clocks on both sides are stable and do not change during the rest of the communication and even long strings of 1s and 0s can be sent
Sometimes, however, the clock frequency on the transmitter side may change slightly during transmission (when no external crystal oscillator is used to create the modulated data in order to keep the cost low) or frequency drift may exist between the external crystals. To have the same clock frequency on both sides, the receiver continuously fine-tunes its re-created data clock. The more often logic ones and zeroes alternate, the better the fine-tuning. If the data to be transmitted contains long strings of logic 1s and 0s, the fine tuning may not be sufficient, which may cause bit errors in the received data. To avoid this, a data whitening technique can be used. This algorithm “whitens” the data in such a way that the 1s and 0s will be better balanced.
I think this answers the both questions.
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