8/28/2023 0 Comments Scramble data set matlab![]() Moreover, it is important to notice that, unlike the additive approach, the multiplicative one is characterized by different schemes for scrambler and descrambler, as shown in Fig.2. Therefore, under ideal conditions, the two techniques exhibit the same error-free performance. Again, in Fig.6 the correct operation of the scrambler / descrambler pair is reported as well, where all the original info bits are recovered with no errors since both employ the same LFSR initial state and no bit corruptions occur between the scrambler output and the descrambler input. However, the disadvantage of the multiplicative scrambling is that even a single wrong bit at the descrambler input can cause a significant error propagation at its output, as shown in Fig.7. In fact, after at most N processed bits (needed for self-synchronization) the descrambler is always able to correctly recover the original info stream (an example is reported in Fig.8, where the case of different Tx/Rx LFSR initial states is simulated). At each time step, the input causes the contents of the registers to shift sequentially. The adders operate modulo N, where N is the value specified by the CalculationBase property. This schematic shows the multiplicative scrambler operation. For example, in WCDMA all the physical channel carrying user data from a specific cell is scrambled by a specific scrambling code and this scrambling code can be the identifier of the physical cell that is transmitting the specific user data.The multiplicative (aka self-synchronizing) approach does not require scrambler and descrambler to be initialized to a common and fixed synchronization word. Description The comm.Scrambler object applies multiplicative scrambling to input data. By designing a set of scramble code (scrambling sequence) in a specific way, you can use it as a specific identification code for each transmitter. ![]() The scrambled sequence should be able to be unscrambled by deterministic / systematic way.
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