% Setup PRBS parameters
O = 12;
M = 2;
N = 2^(O-1); % Length of PRBS
randkey = 1; % Random key for random stream

[~, seed] = prbs(O, 1); % Initialize first seed of PRBS
bitpattern = [];

s = RandStream('twister', 'Seed', randkey);
for i = 1:log2(M)
    bitpattern(:, i) = randi(s, [0 1], N, 1);
end

Tx_bits = Informationsignal(bitpattern);

Digi_Mod = PAMmapper(M, 0,"eth_style",1);

% Map bits to symbols
Symbols = Digi_Mod.map(Tx_bits);

% Demap symbols back to bits
Rx_bits = Digi_Mod.demap(Symbols);

[~, error_num, ber, ~] = calc_ber(Tx_bits.signal, Rx_bits.signal, ...
    "skip_front", 0, "skip_end", 0, "returnErrorLocation", 1);

fprintf('BER VNLE: %.1E \n',ber);