Empirical ber must be a real vector between 0 and 1

When i use a line berfit(EbNoEncoderInput, BERVec(1,:)); i got a error like EMPBer must a real vector between 0 and 1

[Rik]

Sounds like BERVec(1,:) is not a real vector with values between 0 and 1. Did you check?

[Sowmika M]

No

[Image Analyst]

Then please check

maxValue = max(BERVec(1,:))
minValue = min(BERVec(1,:))

See documentation: berfit

Answer 1

[Ayush]

Hi Sowmika,

I understand that you want to resolve the error stating “EMPBer must be a real vector between 0 and 1”.

First step would be to ensure that “EbNoEncoderInput” is a vector of “Eb/N0” values (the ratio of bit energy to noise power spectral density) in dB and “BERVec(1,:)” is a vector of corresponding BER measurements for the “Eb/N0” values. You can follow below steps to correct the error in your code:

• Check Real Values: Ensure that “BERVec(1,:)” contains only real numbers, not complex numbers.
• Range of Values: Make sure that all the elements in “BERVec(1,:)” are within the range of 0 to 1. BER cannot be negative or greater than 1, as it represents the ratio of the number of incorrect bits to the total number of transmitted bits.
• No “NaNs” or “Infs”: Check for “NaN” (Not a Number) or “Inf” (Infinity) values in your BER vector, which are not valid input for “berfit”.

You can refer the pseudo code below to get an idea on how to implement above suggested methods:

% Check for real numbers
if ~isreal(BERVec(1,:))
    error('BERVec must contain only real numbers.');
end

% Check for values within the range [0, 1]
if any(BERVec(1,:) < 0) || any(BERVec(1,:) > 1)
    error('BERVec values must be between 0 and 1.');
end

% Check for NaNs or Infs
if any(isnan(BERVec(1,:))) || any(isinf(BERVec(1,:)))
    error('BERVec must not contain NaN or Inf values.');
end

% If all checks pass, use berfit
berfit(EbNoEncoderInput, BERVec(1,:));

For more information on “berfit” function you can refer the documentation page given below:

https://www.mathworks.com/help/comm/ref/berfit.html

Regards,

Ayush