please teach me how to change in 2020 version??

that codes are 2015 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)));

i want to change these codes 2020 version

Answer 1

[Steven Lord]

The modem package was removed from Communications Toolbox in release R2019a. We first noted that modem.qammod and modem.qamdemod would be removed in a future release starting in release R2016a and we started issuing warnings about all the functionality in the modem package being removed in release R2018a. See the table in the Release notes for recommended replacements for those functions.

[Choi]

thank you for anwser how can i see the table???

[Choi]

and i already changed qammod in 2020 but, it's not working can you tell me why?

[Choi]

also, i want to change not only modem.qammod but also modulate and demodulate

[Steven Lord]

Click on the link I posted. Scroll down to the item "modem package has been removed".

A quick look at the documentation page for the recommended replacement shows several examples that may be of use to you in learning how to use that replacement to perform this modulation.

I don't use Communications Toolbox at all but perhaps if you post your attempted update of the code, the output of whos so we can see the class and size of the variables used in that code, and the full text of whatever error or warning messages you receive (if you receive any) someone with more experience with that toolbox may be able to offer some guidance.

[Choi]

thank you but, i was outout of whos but, there aren't anything just was output what my code. i want to know what changed modulate and demodulate.

[Choi]

bc modulate changed analog signal but, in 15version used data signal so, i dont understand anything and they dont explained modulate. only analog signal.... i want to know data signal of modulate

Answer 2

[Walter Roberson]

hmodem =   modem.qammod('M',M,  'SymbolOrder', 'Gray','InputType', 'bit');
digMod1 = modulate(hmodem,x(Nt+1:Nt+Nobit,:));
digMod2 = modulate(hmodem,x(Nt+Nobit+1:Nt+2*Nobit,:));

should be replaced with

digMod1 = qammod(x(Nt+1:Nt+Nobit,:), M, 'gray', 'InputType', 'bit');
digMod2 = qammod(x(Nt+Nobit+1:Nt+2*Nobit,:), M, 'gray', 'InputType', 'bit');

and

hdemodem = modem.qamdemod('M', M,'SymbolOrder','Gray','OutputType','bit');
bitb1 = demodulate(hdemodem,sqrt(42)*ytry(inth(1)));
bitb2 = demodulate(hdemodem,sqrt(42)*ytry(inth(2)));

should be replaced with

bitb1 = qademod(sqrt(42)*ytry(inth(1)), M, 'gray', 'InputType', 'bit');
bitb2 = qademod(sqrt(42)*ytry(inth(2)), M, 'gray', 'InputType', 'bit');