meowlucian / sdr_matlab_ofdm_802.11a Goto Github PK

Threshold_graph=Threshold*ones(1,length(M_n));
Threshold_graph(idx-L-1)=1.15;

I face some problems in understanding the intention of these two sentences. If you are free, would you please give me some guidance? thank you ahead of time.

I could follow the contents as given and run the code with the zedboard. I need to measure Doppler Frequency or the propagation time from tx to rx. Can you give some tips to measure about it?

By the way, the Doppler frequency is related to CFO as estimated on the code, but the size of it is quite big around over 30,000Hz. Should I check the FFT of the received signal?

Recently, I am reading the core code about the frame detection described in your repository called SDR_Matlab_OFDM_802.11a_2.4GHz. But some parameters setting confuse me. To be exact, i do not understand the intention of parameter Length_over_Threshold and why the value of Length_over_Threshold should be 230.

For another, the nexe code block confuses me.

for x=1:length(Packet_Front_idx)-1
    if M_n(Packet_Front_idx(x)+Length_over_Threshold)>Threshold;
        idx=Packet_Front_idx(x)+L+1; 
    end 
end 

If you are free, I would be more than thankful to receive your answers to my questions.