get_affix.m

国外大学的同志作出来的好程序

function [prefix, appendix]=get_affix(symbols, sim);
%set the prefix and the appendix for symbols.
%
%Related parameters
%sim.symbol_rate
%sim.prefix_type
%sim.prefix_time
%sim.appendix_type
%sim.appendix_time
%
%
if findstr(lower(sim.prefix_type), 'mseq'),
    prefix_repnum=str2num(sim.prefix_type(5));
    prefix_len=round(sim.prefix_time*sim.symbol_rate/prefix_repnum);

    %decide the m-value for m-sequence or modified m-sequence
    m=floor(log2(prefix_len))+1;
    [prefix, prefix_bin]=zac_mseq(m, 'mseq');
    prefix=prefix(1: prefix_len);

    prefix=repmat(prefix, prefix_repnum, 1);

end

if findstr(lower(sim.appendix_type), 'mseq'),
    appendix_repnum=str2num(sim.appendix_type(5));
    appendix_len=round(sim.appendix_time*sim.symbol_rate/appendix_repnum);

    %decide the m-value for m-sequence or modified m-sequence
    m=floor(log2(appendix_len))+1;
    [appendix, appendix_bin]=zac_mseq(m, 'mseq');
    appendix=appendix(1: appendix_len);

    appendix=repmat(appendix, appendix_repnum, 1);
end

if findstr(lower(sim.appendix_type), 'prefix')
    appendix=prefix;
end