constell_mapping_rate.m

国外大学的同志作出来的好程序

function mapping_rate=constell_mapping_rate(mapping_type);
%Get mapping rate of the mapping_type.
%For example, if mapping_type='bpsk', mapping_rate=2;
%
mapping_rate=[];
if strcmp(lower(mapping_type), 'bpsk') | strcmp(lower(mapping_type), 'psk2') | strcmp(lower(mapping_type), 'pam2')
    mapping_rate=1;
elseif strcmp(lower(mapping_type), 'qam4') | strcmp(lower(mapping_type), 'qpsk') | strcmp(lower(mapping_type), 'pam4') ...
        | strcmp(lower(mapping_type), 'psk4')
    mapping_rate=2;
elseif strcmp(lower(mapping_type), 'qam8') | strcmp(lower(mapping_type), 'psk8') | strcmp(lower(mapping_type), 'pam8')
    mapping_rate=3;
elseif strcmp(lower(mapping_type), 'qam16') | strcmp(lower(mapping_type), 'psk16')| strcmp(lower(mapping_type), 'pam16')
    mapping_rate=4;
elseif strcmp(lower(mapping_type), 'qam32')
    mapping_rate=5;
elseif strcmp(lower(mapping_type), 'qam64')
    mapping_rate=6;
elseif strcmp(lower(mapping_type), 'qam128')
    mapping_rate=7;
elseif strcmp(lower(mapping_type), 'qam256')
    mapping_rate=8;
else
    disp('[mapping_rate]Error: type is not supported.');
    return;
end