Multi-carrier transmitter

GNU Radio
1

Hello everyone.

I am looking for some design suggestions for a multi-carrier
transmitter with one daughterboard. I took a look at the hardware and
software yesterday. From my understanding it looks like I would have
to write a DUC in the FPGA that would mix and combine my multiple
channels. I actually want to transmit the same data on all channels…
Anyways, I was wondering if anyone has looked into this or if there
has been any work in this area?

Thanks
Jeff

2

Jeffrey K. wrote:

Thanks
Jeff

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If all your carriers are within the bandwidth of a USRP transmit stream,
then you simply generate your signals,
combine them mathematically in the host, then send the composite
signal to the USRP to transmit.

Assuming that the host host has enough computrons to compute the
required math for multiple carriers, it
should work just fine.

3

Marcus L. wrote:

If all your carriers are within the bandwidth of a USRP transmit stream,
then you simply generate your signals,
combine them mathematically in the host, then send the composite
signal to the USRP to transmit.

Assuming that the host host has enough computrons to compute the
required math for multiple carriers, it
should work just fine.

Yes. And if your carriers are evenly spaced and have enough guard band
between them, there is a very computationally efficient way of using an
IFFT to do this already in the software (blks.synthesis_filterbank).

–
Johnathan C.
Corgan Enterprises LLC
http://corganenterprises.com