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Re: [Discuss-gnuradio] transmitter receiving its own packet
From: |
Josh Blum |
Subject: |
Re: [Discuss-gnuradio] transmitter receiving its own packet |
Date: |
Wed, 10 Apr 2013 19:04:11 -0500 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130308 Thunderbird/17.0.4 |
On 04/10/2013 12:27 AM, Rahman, Muhammad Mahboob Ur wrote:
> Hi Josh,
>
>> So it would be possible to mute the ADC samples when the device is
>> transmitting. However, that might only be desirable in a couple of
>> use cases, and there are probably a dozen ways to solve this from
>> all the way down at the physical layer up the the MAC layer:
>
>> * mute the RX ADC when transmitting (probably an FPGA mod)
>
>
> We are interested to operate our USRP N200 radios in TDM. In other
> words, we want each of our radio to transmit and receive at the same
> frequency. Since we expect very high self-interference in this case,
> we would be interested to play a little bit with the ADC mute option.
> Could you provide us some pointers on where to modify the FPGA code
> to do this? Also, how much realistic/feasible it sounds if we want to
https://github.com/EttusResearch/uhd/blob/master/fpga/usrp2/top/N2x0/u2plus_core.v
See the section at line 614? Use the run_tx signal to conditionally zero
out the values going to .adc_a and .adc_b
> control ADC (on/off) switching from within the GRC flow graph (at the
> very least, we will expect some latency associated with this
> operation).
>
If you are running continuous receive, by knowing the transmit time of a
packet - or based on some concept of valid transmit window, you can
choose what rx samples to ignore based on the rx sample's timestamps. --
that would be the most exact way to do it.
-josh
>
> Thanks in anticipation, Mahboob
>
- [Discuss-gnuradio] transmitter receiving its own packet, Sahoo, Anirudha, 2013/04/09
- Message not available
- Message not available
- Re: [Discuss-gnuradio] transmitter receiving its own packet, Marcus D. Leech, 2013/04/09
- Re: [Discuss-gnuradio] transmitter receiving its own packet, M. Ranganathan, 2013/04/09
- Re: [Discuss-gnuradio] transmitter receiving its own packet, Josh Blum, 2013/04/09
- Re: [Discuss-gnuradio] transmitter receiving its own packet, Rahman, Muhammad Mahboob Ur, 2013/04/10
- Re: [Discuss-gnuradio] transmitter receiving its own packet,
Josh Blum <=
- Re: [Discuss-gnuradio] transmitter receiving its own packet, Marcus D. Leech, 2013/04/09
Message not available