data aqusition toolbox,an error

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osman yurdakul
osman yurdakul 2011-5-27
[EDIT: 20110527 07:57 CDT - reformat - WDR]
clear all;clc;close all
f_signal = 40000; % Orneklenecek isaretin frekansi
T_signal = 1 / f_signal; % Orneklenecek isaretin periyodu
f_sample = 160000;% Ornekleme frekansi
T_sample = 1/f_sample;% Ornekleme periyodu
T_bit = 2*power(10,-3);% Saniye cinsinden bit suresi
T_frame = 1;% Bir cercevenin saniye cinsinden suresi
blank = 276;%Frame'e 20 bit suresi kadar bosluk konacak
barker_code_lenght = 13;
rate = 1 / T_bit; % Saniyede iletilen sembol sayisi
data_length = T_frame/T_bit - 1 - blank - barker_code_lenght;
A_signal = 1;% Tasiyici isaretin genligi
sample_number_per_bit = T_bit * f_sample;
h = [1 1 1 1 1 -1 -1 1 1 -1 1 -1 1];
h_barker = fliplr(h);
N = sample_number_per_bit;
h_barker2 = reshape(repmat(h_barker,N,1),1,N*length(h_barker));
AI = analoginput('nidaq','Dev1');
set(AI,'InputType','SingleEnded');
chans = addchannel(AI,8);
set(AI,'SampleRate',f_sample)
set(AI,'SamplesPerTrigger', f_sample*5);
set(AI,'TriggerType','Manual');
set(AI,'ManualTriggerHwOn', 'Trigger');
start(AI)
trigger(AI)
r = getdata(AI);
stop(AI);
r = r - 4.24;
t = 0:T_sample:5*T_frame-T_sample;
r1 = r.*cos(2*pi*f_signal*t');
r2 = -1i*r.*sin(2*pi*f_signal*t');
rp = r1 + r2;
rp_conv = conv(rp,h_barker2);
rp_conv2 = abs(rp_conv);
[max_rp_conv2,n] = max(rp_conv2);
R2 = r(n-length(h)*320:end);
R3 = R2(length(h)*320+1:end);
R4 = R3(1:(data_length+1)*320);
% % % % % % % % % % DEMODULATION % % % % % % % % % % % %
t = 0:T_sample:(data_length + 1) * T_bit-T_sample;
Y1 = R4' .* cos(2*pi*f_signal*t);
Y2 = -1i*R4' .* sin(2*pi*f_signal*t);
y1 = sum(reshape(Y1,320,211));
y2 = sum(reshape(Y2,320,211));
y = y1 + y2;
decision = real( y(2:end) .* conj(y(1:end-1))) < 0;
received_string = sprintf('%i',decision)
word_phrase_receiver = char(bin2dec(reshape(received_string,7,[]).')).'
when i run this code, i get an error like
??? proje_uygulama_alıcı
|
Error: The input character is not valid in MATLAB statements or expressions.
how can i deal with this situation? what i do wrong?
please help me...

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采纳的回答

Walter Roberson
Walter Roberson 2011-5-27
You appear to have saved the code in a file named "proje_uygulama_alıcı.m" . That name contains the character "ı" which is not one of the Latin characters (upper or lower case) or one of the digits or an underscore. Filenames for scripts or functions must obey the same rules as MATLAB identifiers. You will have to replace the "ı" with some other character.

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