[Discuss-gnuradio] LTE and DVB-T signals

[isabella nardacchione]

Hi,
I have to generate DVB-T and LTE signals using gnuradio companion.
I'm in trouble because I don't know how to set some parameters in the OFDM modulator block.

LTE signal:
transmission bandwith: 5MHz
FFT size: 512
Cyclic prefix length: 128
occupied subcarriers:300  

My questions concerning LTE signal are:
1) The number of occupied tones is the number of occupied subcarriers?
2)Which value should I set for the payload length?

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DVB-T signal:
transmission bandwith: 5MHz
FFT size: 8192 (8k)
occupied carriers:6817  

My question concerning DVB-T signal is:
1)Which value should I set for the Payload length and the Cyclic prefix length?

In both cases of LTE and DVBT signals is it correct to set INPUT TYPE as "complex"?

If someone could help me,   I would be very thankful.