Mathlab code for Modified duobinary encoder without Precoder

Code for modified duo binary without precoder using Mathlab

Answer 1

[Dev]

Hi @Sanginadam Neeha,

I am assuming that you need help in writing the code for a modified duo-binary encoder (without precoder) in MATLAB. To achieve the same, you can refer to the steps mentioned below-

• Define a random binary input sequence and generate the same using the “randi” function available in MATLAB.
• Convert the binary bits (0 and 1) into their polar form (-1 and +1) using mathematical operations.
• Next, we can use these polar bits to generate a duo-binary encoder (without precoder) as follows-

% Modified Duo-Binary Encoding (no precoder)
encoded = zeros(1, N);
encoded(1) = input_polar(1); % Assume x(0) = 0
for n = 2:N
    encoded(n) = input_polar(n) + input_polar(n-1);
end

• Finally, we can plot both the input bits and the duo-binary encoded signal using the “subplot” function in MATLAB. I have attached a reference screenshot below showing the signals-

For more information on the usage of functions mentioned above, please refer to the links below-

“randi”- https://www.mathworks.com/help/releases/R2024b/matlab/ref/randi.html

“subplot”- https://www.mathworks.com/help/releases/R2024b/matlab/ref/subplot.html

Hope the above steps resolve your query.