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QAM demodulator

hi

 

I am new to this labview.. so if please anyone could help me in clearing my doubts related to the vi  http://zone.ni.com/devzone/cda/epd/p/id/5100

1)  In the polar graph..why the  X-axis has been labelled as 00 , 10 , 11 , 01 (from right to left)?

2) I am unable to demodulate the transmitted wave if i add noise in the channel..so if please anyone could send me the demodulator part (recieved bits and the corresponding recieved waveform after demodulating) for this  vi. 

 

 Regards

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