SOURCEFORGE » RALF » 2015 Simplified communications schemes of Voyager I probe

h1. BPSK link BER simulation

For a beginner of LABVIEW, The first step of simulation is building a BPSK communication chain with Gauss White Noise channel and without coding. 

!Communication_chain_without_coding.jpg!

Communication chain of BPSK without coding

Like the figure above, we first generate the pseudorandom series bits “0” or “1”, then use BPSK modulation, we make “0” with 0 radian phase, and “1” with pi radian phase. Put signal through the Gauss White Noise channel, of course the noise comes out through the Eb/N0 calibration module, the next step is BPSK demodulation, use it to recovery the information bits, then the last step if calculate the BER. According the different Eb/N0, we get the different BER, the we draw the BER curve as a function of Eb/N0, 

The following is the program block with G-language:

!Labview_blocks_without_coding1.jpg!

Figure of the communication chain blocks without coding 1

!Labview_blocks_without_coding2.jpg!

Figure of the communication chain blocks without coding 2

!Labview_blocks_without_coding3.jpg!

Figure of the communication chain blocks without coding 3

The interface of Labview is shown as following:

!Communication_chain_interface_without_coding.jpg!

Communication Chain interface without coding of BPSK