Re: [Discuss-gnuradio] Frequency multiplexing at baseband -filters introduce 'DDDDDDDDDDD'

[Marcus Müller]

Dear Damindra,

a "D" means that your computer was so busy, the operating system wasn't able to handle network data sufficiently fast, and in effect, network packets were dropped even before they reached UHD.

This means that your filter is too compute-intense for your PC. Either get a faster PC, or decrease the order of your filter. Overly sharp filters are a common mistake.

Best regards,

Marcus

On 05.12.2016 21:25, Damindra Bandara wrote:

Hi,

I am trying to send multiple baseband signals combined using USRP N210. To do that I multiplied the baseband signals by a proper sine wave and added them before transmission. At the receiver I try to filter the signals using bandpass filters, then multiply using the same sinewave and extract the signal. The problem I am facing is that as soon as I add a filter the USRP started to give a sequence of 'DDDDDD' s.  Could somebody please help me to understand what is going on.

If the method I am trying to get the frequency multiplexing at the baseband is wrong could you please give me some instructions to do baseband channel multiplexing. I appreciate if you could give me any help.

Thank you,

Damindra

--

Damindra Savithri Bandara,

Ph.D. in Information Technology (Candidate)
George Mason University,
Fairfax,
Virginia

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