What am I missing here? I always get OFDMguiFnSound requires more input arguments.

function OFDMguiFnSound(action)

% Consolidates all of the GUI callbacks into one main function

stringArray = [...

% Slide 1

'Welcome to the Sound OFDM demo. This simulates QAM '...

'and OFDM using a sound file as input to demonstrate '...

'the advantages of using OFDM with a multipath '...

'channel. '...

'Choose the strength of multipath present in the '...

'channel and the plot will show the current channels '...

'frequency response. ';...

% Slide 2

'Here is a frequency domain (FD) representation of the '...

'QAM data to be transmitted. '...

'Press any key to continue. '...

' '...

' '...

' '...

' ';...

% Slide 2b

'For QAM (single-carrier) transmission, this plot '...

'shows the channel frequency response (black) and the '...

'received data (light blue) overlayed on the original '...

'data (blue). Note that the received data is slightly '...

'distorted due to the fading channel caused by '...

'multipath. '...

'Press any key to continue. ';...

% Slide 2c

'Here is a frequency domain (FD) representation of the '...

'OFDM data to be transmitted. '...

'Press any key to continue. '...

' '...

' '...

' '...

' ';...

% Slide 2d

'For OFDM (multi-carrier) transmission, this plot '...

'shows the channel (black) and received data (light '...

'blue) overlayed on the original data (blue). Note '...

'that the OFDM received data also exhibits multipath '...

'distortion. Also, notice that the OFDM signal is '...

'spread out over more bandwidth than QAM since OFDM '...

'uses many carrier frequencies. ';...

% Slide 3

'Here are the final plots of the recovered sound files '...

'along with the Bit Error Rate (BER) for OFDM and QAM. '...

'Click any of the 3 buttons to hear these sounds. '...

'Since OFDM handles multipath better, the sound is '...

'less distorted. '...

'The Long Sounds demonstrate longer examples that have '...

'already been processed offline. '];

switch action

case 'next' %---------------------------------------

textHnd1=findobj('Tag','StaticTextFeedback');

nextHnd1=findobj('Tag','PushbuttonNext'); % handler for the Next button

% axis handlers

axisHnd1=findobj('Tag','Axes1'); % main

axisHnd2=findobj('Tag','AxesOriginal'); % original

axisHnd3=findobj('Tag','AxesQAM'); % QAM

axisHnd4=findobj('Tag','AxesOFDM'); % OFDM

% multipath handlers

textHnd2=findobj('Tag','StaticTextMultipath');

popupHnd1=findobj('Tag','PopupMenuMultipath');

% Generated Sounds handlers

textHnd3=findobj('Tag','StaticTextGenSounds');

OriginalHnd1=findobj('Tag','PushbuttonOriginal');

QAMHnd1=findobj('Tag','PushbuttonQAM');

OFDMHnd1=findobj('Tag','PushbuttonOFDM');

% Long Sounds handlers

textHnd4=findobj('Tag','StaticTextLongSounds');

OriginalLongHnd1=findobj('Tag','PushbuttonOriginalLong');

QAMLongHnd1=findobj('Tag','PushbuttonQAMLong');

OFDMLongHnd1=findobj('Tag','PushbuttonOFDMLong');

% BER handlers

textHnd5=findobj('Tag','StaticTextBER1'); % label

textHnd6=findobj('Tag','StaticTextBER2'); % label

textHnd7=findobj('Tag','StaticTextBERQAM'); % OFDM BER field

textHnd8=findobj('Tag','StaticTextBEROFDM'); % QAM BER field

global COUNTER

if isempty(COUNTER)

COUNTER = 0; % initialize COUNTER if doesn't exist

end

COUNTER = COUNTER + 1;

[r , ~]=size(stringArray);

if COUNTER > r

COUNTER = 0;

close(gcf)

% SoundGUI

SoundGUI_win % windows only

else

set(textHnd1,'String',stringArray(COUNTER,:))

switch(COUNTER)

case 1

% disp('Slide 1')

% Show/Hide the GUI

set(nextHnd1,'String','Next')

% show multipath controls

set(textHnd2,'Visible','on')

set(popupHnd1,'Visible','on')

% enable multipath controls

set(textHnd2,'Enable','on')

set(popupHnd1,'Enable','on')

% show main axis

set(axisHnd1,'Visible','on'),axes(axisHnd1)

% hide other axis's

set(axisHnd2,'Visible','off')

set(axisHnd3,'Visible','off')

set(axisHnd4,'Visible','off')

% hide generated sounds stuff

set(textHnd3,'Visible','off')

set(OriginalHnd1,'Visible','off')

set(QAMHnd1,'Visible','off')

set(OFDMHnd1,'Visible','off')

% hide long sounds stuff

set(textHnd4,'Visible','off')

set(OriginalLongHnd1,'Visible','off')

set(QAMLongHnd1,'Visible','off')

set(OFDMLongHnd1,'Visible','off')

% hide the BER displays

set(textHnd5,'Visible','off')

set(textHnd6,'Visible','off')

set(textHnd7,'Visible','off')

set(textHnd8,'Visible','off')

set(popupHnd1,'Value',1) % no channel by default

% default plot

plot(0:.05:.5,zeros(1,11)),axis([0 0.5 -12 6]),title('Channel Magnitude Response')

xlabel('Digital Frequency'),ylabel('Magnitude (dB)')

case {2, 3, 4, 5}

% disp('Slide 2')

% disble multipath controls

set(textHnd2,'Enable','off')

set(popupHnd1,'Enable','off')

setupSoundGUI % sets up the Sound GUI variables

set(textHnd1,'String','QAM Simulation... Please Wait')

QAM

set(textHnd1,'String',stringArray(COUNTER,:))

fft_temp = abs(fft(QAM_tx_data));

fft_temp = fft_temp(1:floor(0.5*length(fft_temp))); % truncate (+ spectrum)

dig_x_axis = (1:length(fft_temp)) / (2*length(fft_temp));

plot(dig_x_axis, fft_temp)

title('FFT of Transmitted QAM')

% calculate the BER and store for slide 6

global BER_QAM_TEMP;

binary_err_bits_QAM = 0;

for i = 1:length(data_in)

err = abs(data_in(i)-QAM_data_out(i));

if err > 0

binary_err_bits_QAM = binary_err_bits_QAM + 1;

end

end

BER_QAM_TEMP = 100 * binary_err_bits_QAM/data_length;

COUNTER = COUNTER + 1;

pause

% disp('Slide 2b')

set(textHnd1,'String',stringArray(COUNTER,:))

hold on

% QAM Plotting

fft_temp = abs(fft(QAM_rx_data));

fft_temp = fft_temp(1:floor(0.5*length(fft_temp))); % truncate

plot(dig_x_axis, fft_temp,'c'),title(' ')

% channel display

if channel_on == 1

ComputeChannelGUI

size_mag=max(mag)-min(mag); % for scaled channel plot

plot(W/(2*pi),(0.5*max(fft_temp)/size_mag)*(mag + abs(min(mag))) + 0.5*max(fft_temp),'k')

end

hold off

COUNTER = COUNTER + 1;

pause

% disp('Slide 2c')

set(textHnd1,'String','OFDM Simulation... Please Wait')

OFDM

set(textHnd1,'String',stringArray(COUNTER,:))

fft_temp = abs(fft(xmit));

fft_temp = fft_temp(1:floor(0.5*length(fft_temp))); % truncate

dig_x_axis = (1:length(fft_temp)) / (2*length(fft_temp));

plot(dig_x_axis, fft_temp)

title('FFT of Transmitted OFDM')

% calculate the BER and store for slide 6

global BER_OFDM_TEMP;

binary_err_bits_OFDM = 0;

for i = 1:length(data_in)

err = abs(data_in(i)-output(i));

if err > 0

binary_err_bits_OFDM = binary_err_bits_OFDM +1;

end

end

BER_OFDM_TEMP = 100 * binary_err_bits_OFDM/data_length;

COUNTER = COUNTER + 1;

pause

% disp('Slide 2d')

set(textHnd1,'String',stringArray(COUNTER,:))

hold on

% OFDM Plotting

fft_temp = abs(fft(recv));

fft_temp = fft_temp(1:floor(0.5*length(fft_temp))); % truncate

plot(dig_x_axis, fft_temp,'c'),title(' ')

% channel display

if channel_on == 1

plot(W/(2*pi),(0.5*max(fft_temp)/size_mag)*(mag + abs(min(mag))) + 0.5*max(fft_temp),'k')

end

hold off

case 6

% disp('Slide 3')

setupSoundGUI

% hide main axis

plot(0) % clear the plot

axis off

% set(axisHnd1,'Visible','off')

% show other axis's

set(axisHnd2,'Visible','on')

set(axisHnd3,'Visible','on')

set(axisHnd4,'Visible','on')

% hide multipath controls

set(textHnd2,'Visible','off')

set(popupHnd1,'Visible','off')

% show generated sound buttons

set(textHnd3,'Visible','on')

set(OriginalHnd1,'Visible','on')

set(QAMHnd1,'Visible','on')

set(OFDMHnd1,'Visible','on')

% show long sounds stuff

set(textHnd4,'Visible','on')

set(OriginalLongHnd1,'Visible','on')

set(QAMLongHnd1,'Visible','on')

set(OFDMLongHnd1,'Visible','on')

% show the BER displays

set(textHnd5,'Visible','on')

set(textHnd6,'Visible','on')

set(textHnd7,'Visible','on') % QAM

set(textHnd8,'Visible','on') % OFDM

% Display the BERs

global BER_QAM_TEMP;

global BER_OFDM_TEMP;

set(textHnd7,'String',strcat(num2str(BER_QAM_TEMP,3),' %'))

set(textHnd8,'String',strcat(num2str(BER_OFDM_TEMP,3),' %'))

clear global BER_QAM_TEMP; % clean up the globals

clear global BER_OFDM_TEMP;

% Plot the Sounds

% Note: axes(handle) sets to plot on the handle axis

axes(axisHnd2)

plot(wavread(file_name)),title('Original sound')

axes(axisHnd3)

plot(wavread('QAM_out.wav')),title('QAM sound')

axes(axisHnd4)

plot(wavread('OFDM_out.wav')),title('OFDM sound')

set(nextHnd1,'String','Start Over') % repeat if desired

otherwise

disp('error')

COUNTER = 0;

end

end

case 'mp_channel' %-----------------------------------

ComputeChannelGUI

if noChannel ~= 1

% large or small case

plot(W/(2*pi),mag),axis([0 0.5 -12 6]),title('Channel Magnitude Response')

xlabel('Digital Frequency'),ylabel('Magnitude (dB)')

else

% none case

plot(0:.05:.5,zeros(1,11)),axis([0 0.5 -12 6]),title('Channel Magnitude Response')

xlabel('Digital Frequency'),ylabel('Magnitude (dB)')

end

case 'close' %---------------------------------------

clear global COUNTER

close(gcbf)

case 'PlayOriginal' %-----------------------------------

sound(wavread('shortest.wav'),11025)

case 'PlayQAM' %---------------------------------------

sound(wavread('QAM_out.wav'),11025)

case 'PlayOFDM' %---------------------------------------

sound(wavread('OFDM_out.wav'),11025)

case 'PlayOriginalLong' %-----------------------------------

sound(wavread('Long.wav'),11025)

case 'PlayQAMLong' %---------------------------------------

sound(wavread('QAM_Long.wav'),11025)

case 'PlayOFDMLong' %---------------------------------------

sound(wavread('OFDM_Long.wav'),11025)

case 'figure' %---------------------------------------

% this is called whenever the figure is first created -or NOT???

% textHnd1=findobj('Tag','StaticTextFeedback');

% axisHnd1=findobj('Tag','Axes1');

% set(textHnd1,'String','Sound OFDM Demo') % default text message

% set(axisHnd1,'Visible','off') % hide Axis to begin

end

Answer 1

[Sahithi Kanumarlapudi]

Hi,

You might have defined another function with the same name but with different number of inputs. Ensuring that the required 'OFDMguiFnSound' is on the path might help you.