Re: [Discuss-gnuradio] LTE and DVB-T signals

[J Mc]

Isabella,

I do not believe the OFDM mod block will provide you with what you need, both DVB-T and LTE follow a highly defined structure that defines pilot symbols and resource scrambling/user mapping that I doubt the OFDM block can emulate without significant modification. If this only has to be "DVB-T/LTE Like" then you could certainly make the statement that occupied tones is relative to occupied subcarriers etc... however it will not work with real hardware. What you could do is develop a non-realtime cell-wide LTE/DVB-T demodulator but even then that isn't a completely simple task, just simpler than a transmitter.

Regards,

John

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Date: Mon, 2 Jul 2012 15:53:28 +0200
From: address@hidden
To: address@hidden
Subject: [Discuss-gnuradio] LTE and DVB-T signals

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?

-----------------------------------------------------------------------------------------------------------
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.


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