[USRP-users] E312 Two Transmit Channel and One Receive Channel

Marcus D. Leech patchvonbraun at gmail.com
Fri Mar 22 10:40:26 EDT 2019


On 03/21/2019 04:06 PM, Xingjian Chen via USRP-users wrote:
> Dear all,
> I am trying to use two tx channels and one rx channel at the same 
> time. Now, I can do 1 tx and 1 rx work at the same time no matter 
> which tx channel I use. However, I cannot make 2 tx channels working 
> with 1 rx properly. I narrow down to a point that in my cpp control 
> file in host computer. As long as I set both tx channel for the 
> streamer to true, the received signal becomes 1/4 cycle. Please check 
> the pictures below or in the attachment.
>
>     tx_radio_ctrl->set_tx_streamer(true, tx_chan);
>     tx_radio_ctrl->set_tx_streamer(true, tx_chan_1);
>     rx_radio_ctrl->set_rx_streamer(true, rx_chan);
>
> When I check in the FPGA code in the receiving chain, I see that the 
> *m_axis_data_tvalid* is switching between high and low. I am wondering 
> if there is any way to set up in cpp or host computer such that 
> forcing the rx radio to keep streaming without any break when using 2 
> tx channels? I tried uhd::stream_cmd_t 
> stream_cmd(uhd::stream_cmd_t::STREAM_MODE_START_CONTINUOUS);
> but no luck. Thank you in advance!
>
As far as I know, 2 x 1 MIMO is not supported on the E31x series. If 
you're using 2 TX channels, you MUST also configure for two RX channels.
   You can simply ignore the data from one channel in your flow-graph.


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