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Dear all, can anyone help me on to fix the following

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samson zitha
samson zitha 2018-1-22
关闭： MATLAB Answer Bot 2021-8-20
Error using comm.APPDecoder/step
Complexity mismatch with input 2; expected real, got complex.
-tmp is QPSK complex signal+noise
Error in G_NOMA_IDMA_SAMSON_ZITHA>CBCReceiever (line 297)
[outSoftData outLLR]= step(hAppDec,ini,transpose(tmp));
In fact i want the hAppDec to decode complex signal, how do i define that in the hAppDec matlab function
e.g
hAppDec = comm.APPDecoder(...
'TerminationMethod','Truncated','TrellisStructure',poly2trellis(3,[5 7]), ...
'Algorithm','True APP','CodedBitLLROutputPort',true);

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