OFDM link simulation

I want to simulate an OFDM link to carry 214 bytes per Ethernet packet &
implement it using 2 laptops running GNU & 2 USRPs.
Each USRP is a TX & RX .(FULL-DUPLEX)

I calculated all OFDM parameters needed.
total BW=200KHz
sample Rate=240k
symbol time including CP=5ms= 8-burst gsm ( one burst is 0.6ms)
T guard= CP =625u
T data=4.375ms
2 bits/subcarrier (QPSK)
number of bits/ ofdm symbol =440 bits
256 subcarriers per symbol , 224 subcarriers used for data , 2
subcarriers
for pilots.
FFT size =256.
I want to use constitutional coding.

I don’t know how to start , and what to write in ofdm blocks (what to
write
in occupied carriers in ofdm transmitter for ex. , … )
I don’t know which blocks can be used & what to write in each field in
the
blocks.
And how to apply constitutional code , do I have to use specific block?!
I am new to Ubuntu & GNU.
I found in GNU folders , Python and c++ codes , I don’t know if I have
to
change in any of these files? Do I have to read them to understand ?

Do I have to write a code to make a TX/RX block ? (As I need full duplex
link)

Anyone can help me how to start??
As I installed GNU a month ago , I tried to read tutorials and search in
doxygen , but till now , I am so confused & don’t know how to fill the
fields in the blocks!!

Thanks :slight_smile:

Hi Sara,

Please look at the OFDM TX/RX examples in GNU Radio Companion. It’s
already
there for you. :slight_smile:

best,
aditya

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