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#1 2017-Jan-30 09:45:08

alice_warp
Member
From: Italy
Registered: 2015-Sep-08
Posts: 53

20 bandwidth in WarpLAB

Hi,

I'm using wl_example_continuous_tx.m script. I saw that WarpLab uses 40MHz bandwidth. Is there any possibility to use 20MHz?
I changed from 40 to 20 the last two clocks of clock_generator_ProcBusSamp_Clocks and from 2 to 4 in status=clk_init(CLK_BASEADDR, 2) [so status=clk_init(CLK_BASEADDR, 4)], but I've just seen that it uses 40MHz.
Maybe I'm doing something wrong....

if I use exp(j*2*pi * 11e6 * t), WARP transmits at 11 MHz, but it should not be possible, because the bandwidth should be 20MHz (from -10 to 10 MHz)... right?

Thank you in advance.
Alice

Last edited by alice_warp (2017-Jan-30 11:21:24)

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#2 2017-Jan-30 13:04:53

murphpo
Administrator
From: Mango Communications
Registered: 2006-Jul-03
Posts: 5159

Re: 20 bandwidth in WarpLAB

You can transmit a 20MHz signal with 40MSps ADCs/DACs using interpolation and decimation filters. This is how the WARPLab OFDM example works. I would definitely recommend leaving the clocks in the WARPLab FPGA design unchanged.

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#3 2017-Jan-31 05:01:23

alice_warp
Member
From: Italy
Registered: 2015-Sep-08
Posts: 53

Re: 20 bandwidth in WarpLAB

Perfect!
As always, thank you.

Alice

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