I'm working with ofdm in Matlab R2015a but facing error kindly help to resolve this

numSC = 128; % Number of OFDM subcarriers

cpLen = 32; % OFDM cyclic prefix length

ofdmMod = comm.OFDMModulator('FFTLength',numSC,'CyclicPrefixLength',cpLen);

ofdmDemod = comm.OFDMDemodulator('FFTLength',numSC,'CyclicPrefixLength',cpLen);

channel = comm.AWGNChannel('NoiseMethod','Variance', ...

'VarianceSource','Input port');

txSig1 = ofdmMod(st1); % where st1 is matrix of 117 by 1 complex double

but getting following error:

Array formation and parentheses-style indexing with objects of class 'comm.OFDMModulator' is not allowed. Use objects of

class 'comm.OFDMModulator' only as scalars or use a cell array.

[Sajid Sarwar]

can someone help?

Answer 1

[Walter Roberson]

R2015a did not support that syntax . You will need to step() the object passing in the object as the first parameter and the data as the second parameter .

[Sajid Sarwar]

Please elborate it with some example

[Walter Roberson]

Replace

txSig1 = ofdmMod(st1);

with

txSig1 = step(ofdmMod,st1);

Just like I described: use step() with the object passed as the first parameter, and the data as the second parameter.