Re: [Discuss-gnuradio] Impulse response in DVB-T, someboby knows how to calculate?

[Ron Economos]

Just a reminder that the gr-dvbt project is now part of GNU Radio in the gr-dtv component and the Digital Television category of gnuradio-companion. The DVB-T receiver has some significant bug fixes and enhancements over the baseline in gr-dvbt.

The C in COFDM stands for "coded". In the case of DVB-T, Viterbi and Reed-Solomon FEC.

The impulse response of a channel is really a separate topic from DVB-T, so I'll let others comment on that. A quick Google of "channel impulse response" provides a starting point.

http://dsp.stackexchange.com/questions/536/what-is-meant-by-a-systems-impulse-response-and-frequency-response

Ron

On 10/02/2016 11:40 AM, Cinaed Simson wrote:

On 10/01/2016 04:46 PM, Juan Antonio wrote:

Hello, someone would know how to calculate the impulse response of a
COFDM, DVB-T channel with an SDR device?

Thank you in advance


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An inverse DFT on a sinc function in the frequency domain yields a sine
function in the time domain. And a DFT on the sine function in the time
domain yields a sinc function in the frequency domain.

I presume the "C" in COFDM means to chop up the bandwidth into carriers
such that the sinc function in one channel hits nulls in the other
channels.

Piece of cake in theory.

There's a gr-dvbt project on github

  https://github.com/BogdanDIA/gr-dvbt

I don't know anything about it - I don't even know if it works.

-- Cinaed

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