Wavecom W-BitView V2.5.00 - Manual (Page 55)

BitView Manual V2.5.00 WAVECOM W-BV Function Library
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Function:
Descramble a bit stream scrambled with a scrambling polynomial (pseudo random sequence). The
polynomial is entered using the Descrambler config field. Clicking the drop-down list will open a shift
register schematic with 16 stages each representing in increasing order the elements of the scrambling
polynomial.
A click on the tick box for each stage enables or disables the individual stage. Clicking a stage icon will
toggle its initial state between 1 and 0. When configuring the descrambler is complete click Ok to save the
configuration, which is displayed in the Characteristic polynomial and Initial shift register state
fields.
Channel Encoding
Convolutional Encoding
In: Bit stream to encode
Out: Convolutionally encoded stream
Function:
Configures the convolutional encoder. The encoder is then applied to a bit stream. The convolutional
encoder may be used for simulators.
Parameter Description Value
Code rate (punctur-
ing)
Defines code rate and puncturing matrix See Standard Depuncturing function
for matrix details
Constraint Length Set constraint length of encoder 3 … 14