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It is possible to do whitening of the transmitted data to avoid long parts of
consecutive 1’s or 0’s on the air (DC-balance). When using whitening in TX, the
data is XOR-ed with a 9-bit pseudo-random (PN9) sequence before being
transmitted. At the receiver end, the data is XOR-ed with the same pseudorandom
sequence. This way, the whitening is reversed, and the original data appear in
the receiver. The polynomial used is x^9+x^5+1 initialized to all 1’s. This
sequence is also used when generating random data.
Whitening is not
performed on the sync word. After a sync word is transmitted or received, the
payload is XOR-ed as showed below.
Since the sync word is not whitened
and the PN9 sequence always has the same initial value, the transmitter and
receiver will always be in sync.
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