Chang center frequency quickly
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Hi Paul,
I would like to change center frequency quickly. If I change it and then restart the object in Matlab, it runs too slow.
Can I change center frequency in real time quickly? Can the example(Receive Tone Signal Using Analog Devices AD9361/AD9364) deployed to ARM?
Thanks and Best Regards,
Ardeal
1 个评论
Jan
2018-10-24
"Change center frequency" is a very vague description, as "runs too slow" is also. Can you edit the question and add more details?
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Paul
2018-10-24
0 个投票
- It is possible to change the CenterFrequency property while the System object is locked as it is a tunable property.Give a look at this doc page comm.SDRRxAD936x System object (R18b) to see a list of tunable properties. Tunable properties can be modified without having to release the System object.
- The Receive Tone Signal Using Analog Devices AD9361/AD9364 example you are referring to cannot be deployed on the ARM. You will have to follow these instructions Hardware-Software Co-Design if you want to deploy a model to the target. This is only available on Simulink.You should be able to create a Simulink model similar to what the example is doing. Since you are not targeting the FPGA, you can focus on the Software Interface Model.
Ardeal Liang
2018-10-25
编辑：Ardeal Liang
2018-10-25
Hi Paul,
Thanks for your answer!
Here are the steps(pseudo-code) of the exeriment I wang to do:
for rf_scan = 1:10
current_center_frequency = start_freq_tx + (rf_scan - 1) * scan_interval;
sdrTransmitter.CenterFrequency = current_center_frequency;
sdrReceiver.CenterFrequency = current_center_frequency;
try
timeCounter = 0;
while timeCounter < StopTime
[data, len, lostSamps] = sdrReceiver();
if (lostSamps > 0)
warning('data lost');
end
if len > 0
% save the data to file
timeCounter = timeCounter + RadioFrameTime;
end
end
catch ME
rethrow(ME);
end
end
I want to change the center frequency without restarting tx and rx.
sdrTransmitter.CenterFrequency = current_center_frequency;
sdrTransmitter(complex(ones(1,1), ones(1,1)));
sdrReceiver.CenterFrequency = current_center_frequency;
The upper code is able to change center frequency, and take effect immediately.
tic
[data, len, lostSamps] = sdrReceiver();
toc
I use the tic and toc to count the time need to receive data by sdrReceiver. The following is time:
the time needed to establish the connection once center frequency is changed is around 7s which is a very long time!
is there anyway to shorten the time(7s)?
Thanks and Best Regards,
Ardeal
1 个评论
Paul
2018-11-6
When calling the step method, it will first setup the System object if it has not been first setup. You can give a look at the call sequence of System objects here: Summary of Call Sequence
I suggest you try to call the setup method of that System object first by doing the following:
setup(sdrReceiver)
while_loop
tic
[data, len, lostSamps] = sdrReceiver();
toc
end
This way, the first call to step should be as quick as the second since the device has been setup before.
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