webeeBitGenerator.m

function [psdu, scramInit] = webeeBitGenerator(sym, cfgNonHT)

    [~, nsym, ~] = size(sym);

    mcsTable = wlan.internal.getRateTable(cfgNonHT);

    persistent codMtrx;
    persistent controlBitIdx;

    if isempty(codMtrx) || isempty(controlBitIdx)
        [codMtrx, controlBitIdx] = getCodMatrix(mcsTable, sym);
    end

    % Constellation demapping
    qamDemodOut = wlanConstellationDemap(sym, 0, mcsTable.NBPSCS, 'hard');
    qamDemodOut = reshape(qamDemodOut, [], 1);

    % Deinterleave
    deintlvrOut = wlanBCCDeinterleave(qamDemodOut, 'Non-HT', mcsTable.NCBPS);
    deintlvrOut = reshape(deintlvrOut, [], nsym);

    % Deduce uncode bits based on "coded bits".
    decBits = uncodeDeduct(codMtrx, deintlvrOut, controlBitIdx);
    decBits = reshape(decBits, [], 1);

    % Derive initial state of the scrambler
    scramInitBits = [0, 1, 0, 0, 1, 0, 0]'; % Fixed according to WEBee.

    % Remove pad and tail bits, and descramble
    if all(scramInitBits == 0)
        % Scrambler initialization invalid (0), therefore do not descramble
        descramDataOut = decBits(1:(16 + 8 * cfgNonHT.PSDULength));
    else
        descramDataOut = wlanScramble(decBits(1:(16 + 8 * cfgNonHT.PSDULength)), scramInitBits);
    end

    % Remove the 16 service bits
    psdu = descramDataOut(17:end);

    % Convert scrambler initialization bits to number
    scramInit = bit2int(scramInitBits, length(scramInitBits));

end