Re: [Discuss-gnuradio] How to change the SNR through gnuradio

[Marcus Müller]

Dear zs,

> I want to change the ratio of power of the received signal to power of the noise.

well, improving receiver SNR is the *core* problem of all wireless communication. Unless you just add noise (on the receiver or the transmitter side, depending on whether you want your noise to be channel-shaped or not), there's your whole digital communication knowledge you can apply (matched filtering, oversampling, coding gain, preselection filtering...).

> And I want to change the gain of the transmitter.
Well, then do that. The usrp_sink block has a TX gain setting, and all daughterboards (aside from the Basic*, LF* and TVRX* boards) have adjustable gain: use the set_tx_gain(gain) method, or if you're using GRC, look into the "RF settings" tab.

Best regards,
Marcus

On 01.03.2016 09:56, w xd wrote:

Sorry for that.

I'm now using the USRP N210,one transmitter and one receiver.I want to change the ratio of power of the received signal to power of the noise.And I want to change the gain of the transmitter.

2016-03-01 16:45 GMT+08:00 Marcus Müller <address@hidden>:

Dear zs,

your question is absolutely unclear. SNR of what? What instrument? TX or RX, or simulation?

Best regards,
Marcus

On 01.03.2016 07:06, w xd wrote:

Hi,

   I want to change the SNR through gnuradio.Can I realize it by just change the gain of the gnuradio?Or the instrument is fixed,and the snr can't be change?

  Thanks so much.

Best Regards,

zs 

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