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## Re: [Discuss-gnuradio] multi-tone carrier wave

 From: pengyu zhang Subject: Re: [Discuss-gnuradio] multi-tone carrier wave Date: Thu, 2 Aug 2012 20:30:43 -0400

Nazmul -- Thanks very much for pointing sampling rate out. Hope I understand correctly. Sending carrier wave at three frequencies is feasible on USRP. However, the gaps between carrier wave frequencies are determined by receivers' sampling rate. If the receiver has 20 MHz sampling rate, the gaps between carrier wave cannot be larger than 10 MHz (or 20 MHz as Ben suggested).

On Thu, Aug 2, 2012 at 8:21 PM, Ben Hilburn wrote:
Also, remember that USRPs use quadrature down-conversion, so if you set the sample rate to 20 MS/s, you can see 20 MHz, not 10 MHz.

Cheers,
Ben

On Thu, Aug 2, 2012 at 2:37 PM, Nazmul Islam wrote:
You can add three sine waves and send them using a single carrier. However, in this approach, the separation of the sine wave frequency components will be limited by the sampling rate.

Let's assume that you can obtain a 20 MS/s sampling rate in your system. You can cover 10 MHz frequency band with this sampling rate. If you use a carrier frequency of 902 MHz, you can send different sine waves up to 912 MHz frequency in this approach.

Thanks,

Nazmul

On Thu, Aug 2, 2012 at 4:51 PM, pengyu zhang wrote:
Hi,

I know that USRP can send out carrier wave at one frequency. For example, a carrier wave at frequency 902MHz. The carrier wave sent is sin(2*pi*902MHz*t). Can we send a carrier wave at three frequencies? For example, a carrier wave at frequency 902MHz, 915MHz, and 928MHz. The carrier wave I want to send is sin(2*pi*902MHz*t)+sin(2*pi*915MHz*t)+sin(2*pi*928MHz*t). Is multi-tone carrier wave feasible given USRP's hardware? How could I implement this on USRP? Thanks.

Pengyu

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Electrical & Computer Engineering
Wireless Information & Networking Laboratory
Rutgers, USA.

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