Some problems when using the Pluto

Dear Sirs, I have some problems when using the Pluto

I am a student from National Taiwan University and I have some problems when using the Pluto for signal transmission experiment.

I executed the Matlab program for sending and receiving signals at the same time (at the same program) via Pluto shown in Fig.1. The API used on the Matlab is "iio_sys_obj_matlab.m". I sent a sinusoidal signal with 1024 in length and the received the consecutive 2048*7 signals shown in Fig.2. My problems are:

  1. Why are the received signals null at the beginning?
  2. How can I transmit and receive signals at the same time by using Pluto? That is, I can acquire the corresponding received signal of the transmitted signal at the same time instant?

 

Fig.1

 

Fig.2

Thanks,

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