MATLAB: Error on coding

berinvalid syntax '='MATLAB

 when i run my codings following error has occoured , it shows that following error is in following code line ...please help to correct it

Error is

phase error at '=' : usage might be a invalid matlab syntax

code is

(j)=a(k).*scar(j); %bpsk signal

Best Answer

You cannot start a statement with (j) =

Guessing there was supposed to be "a(j) = " or some other variable name.

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MATLAB: Estimate BER for LDPC 1/2 code

Hi Pertesis,

The issue you observe is due to the usage of comm.BPSKDemodulator with hard decision (which is the default) in conjunction with the LDPC decoder. Note that LDPC decoder expects the input to be the LLR's, but due to the hard decision from the BPSK demodulation, the output is bits from it. This is provided to LDPC decoder and it just wasn't able to decode any of it properly. I suggest you to make the following update to the BPSK demodulator and place the EbNoVec range from -11:0.1:2 to see the free falling curve.

bpskDEModulator = comm.BPSKDemodulator('DecisionMethod',"Log-likelihood ratio");

More details of the usage of LDPC decoder and BPSK demod can be accessed with the links.

Hope this helps.

Regards,

Sriram

Best Answer

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