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How can i change syntax ?left is 2020 right is 2015 I want to change lines on 22, 23 in 2020 from 2015 but, I don't know how to change it.

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Choi
Choi 2020-10-1
关闭： MATLAB Answer Bot 2021-8-20
i want to change syntax so, I changed syntax in 2020 from 2015's version syntax but, it's not working. please teach me my errors. Thank you in advance
  2 个评论
Choi
Choi 2020-10-2
编辑：madhan ravi 2020-10-2
These codes are in 2015, but i want to change 2020 version
bc it's not working in 2020 version
hmodem = modem.qammod('M',M, 'SymbolOrder', 'Gray','InputType', 'bit');
hdemodem = modem.qamdemod('M', M,'SymbolOrder','Gray','OutputType','bit');
digMod1 = modulate(hmodem,x(Nt+1:Nt+Nobit,:));
digMod2 = modulate(hmodem,x(Nt+Nobit+1:Nt+2*Nobit,:));
bitb1 = demodulate(hdemodem,sqrt(42)*ytry(inth(1)));
bitb2 = demodulate(hdemodem,sqrt(42)*ytry(inth(2)));
bitb123 = demodulate(hdemodem,sqrt(42)*yzf(inth3(1)));
bitb223 = demodulate(hdemodem,sqrt(42)*yzf(inth3(2)));
bitb12 = demodulate(hdemodem,sqrt(42)*ysp(inth2(1)));
bitb22 = demodulate(hdemodem,sqrt(42)*ysp(inth2(2)));
bitb14 = demodulate(hdemodem,sqrt(42)*yml(inth4(1)));
bitb24 = demodulate(hdemodem,sqrt(42)*yml(inth4(2)));

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回答（1 个）

Priysha LNU
Priysha LNU 2020-10-7
The function "qammod" takes a 'data signal' as the first input argument.
y = qammod(x,M,Name,Value) % modulates input signal x by using QAM with the specified modulation order M. Output y is the modulated signal.
The code provided above in comments shows a 'string' ('M') as first input argument instead of a data signal.
Try changing this argument to a signal instead of a string.
Refer to this documentation link for more information.
Similarly for function "qamdemod" takes input signal 'y' for its first argument, not a string ('M').
z = qamdemod(y,M,Name,Value) %returns a demodulated signal, z, given quadrature amplitude modulation (QAM) signal y of modulation order M.
Refer to this documentation link for more information.
DISCLAIMER: These are my own views and in no way depict those of MathWorks.

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