i get an error when i try to define type of modulation

This expression'

mod_methods = ('BPSK','QPSK','8PSK','16QAM','32QAM','64QAM');

gives me this error

Expression or statement is incorrect--possibly unbalanced (, {, or [.

Answer 1

[Walter Roberson]

mod_methods = {'BPSK','QPSK','8PSK','16QAM','32QAM','64QAM'};

[Ray]

Thanks for the answer. I also have an error for the following line:

rec_syms = knnsearch([real(symbol_book) imag(symbol_book)], [real(X_hat) imag(X_hat)]) - 1;

Error using KDTreeSearcher/knnsearch (line 74)
Y must be a matrix with 8 columns.

Error in knnsearch (line 142)
    idx = knnsearch(O,Y,'k',numNN, 'includeties', includeTies);

Error in OFDM_image (line 139)
rec_syms = knnsearch([real(symbol_book) imag(symbol_book)], [real(X_hat) imag(X_hat)]) - 1;

[Walter Roberson]

[real(symbol_book) imag(symbol_book)] together makes a matrix with 8 columns, such as if there are 4 columns in symbol_book. But [real(X_hat) imag(X_hat)], the locations to search for, does not have 8 columns. The locations to search for (the second parameter) must have the same number of columns as the first parameter.