How can implement descrambler operation ?

Hello,

I am trying to channel modelling in Matlab. I should complete descrambler processing in Receiver in order to recover original signal. I completed Scrambler part with XOR operation but I stuck about descrabler process. I shared below my scrambler process codes.

    length = 1200;       

    binaryalph = [0,1];

    randomData = randsrc(1,length,binaryalph);

    seed = [[0,0,1,1, 1,1,1,1, 1,1,1,1, 1,1,1]
        [0,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1]
        [1,0,1,1, 1,1,1,1, 1,1,1,1, 1,1,1]
        [1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1]];

    initialState = seed(1);

    % Generator polynomial for LFSR ( 1 + x^(-14) + x^(-15) )
    generatorPolynomial = [1,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,1,1];

    % Mask represents the value to tap from LFSR as output
    mask = [1,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0];

    % Create PN Sequence object having the recommended generator polynomial and
    % given initialState
    % scr = comm.Scrambler(length(generatorPolynomial),'1 + x^(-14) + x^(-15)',         

    h =  commsrc.pn('GenPoly',generatorPolynomial,    ...
              'InitialStates',initialState,     ...
              'CurrentStates',initialState,     ...
              'Mask',mask,                      ...
              'NumBitsOut',1);

    % Number of bits to generate for scrambling must be equal to the number of
    % bits in the input
    set(h,'NumBitsOut',numel(randomData));

    % Do bitwise xor between input bits and generated pseudo-random bits to get
    % the scrambled output bits
    scrambledBitVector = bitxor(randomData,reshape(generate(h),1,[]));

If someone show the way how can I descrambler operation or share the descrambler codes reallay appreciate that.

Thanks in advance?

PALES

Answer 1

[Phung Dao]

Are you sure your scambler function works?