Is it possible to use a decimation factor smaller than 4 in the comm.SDRuReceiver System object?

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Linus Rüttimann
Linus Rüttimann 2015-6-8
评论： sadegh 2023-8-3
Im planning to buy a USRP B200/B210 SDR Board.
According to the comm.SDRuReceiver System object documentation the decimation factor must be >= 4. This would lower the usable bandwidth of the USRP B200 to 56MHz/4=14MHz. According to the Hardware description it should be possible to receive the full 56MHz signal though. I was wondering if this is a documentation mistake or a software limitation?

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Linus Rüttimann
Linus Rüttimann 2015-6-29
I have tested myself in the meantime. It's possible to set a decimation factor smaller than 4 with the B200.

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Walter Roberson
Walter Roberson 2015-6-8
Looking at http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/2012-September/005313.html it looks like the DAC has a minimum 4x interpolation (so 100 MSamp/s would become 400 MSamp/s), so the 4x decimation would be returning to the original speed, not reducing the bandwidth.

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