Hi Sakthivel,
great to hear that you are interested in contributing to GNU
Radio! I'm sure GNU Radio would benefit from a well-written
gr-mimo module.
Practical difficulties are very likely to appear during the
design and the implementation, how problematic that is for the
feasibility of the project, however, mainly depends on you. :)
Synchronization and channel estimation will be one issue you have
to deal with, and if you use multiple USRPs for the trasnmitter or
the receiver, you will have to deal with the inter-device
synchronization, too. The latter could, e.g., be alleviated by
simply using USRP B210s and restricting the system to 2x2 antennas
as you wrote yourself.
At your stage, I think it's most important to get a clear idea of
what you would like to implement. As this is not one of our ideas
from the list, the acceptance of the project does not only depend
on your proposal and the idea itself, we would also have to find a
mentor for that and this is much easier with a clearly scoped
proposal.
So make a plan with deliverables you think you can actually
realize in the given time and come back to this list so we can
discuss it further.
If anybody here on this list thinks he'd want to mentor such a
project, feel free to chime in!
Cheers,
Felix
On 02/27/2018 02:53 PM, Sakthivel
Velumani wrote:
Hi all,
I am a graduate student at Technische Universitat
Darmstadt, Germany, majoring in signal processing for wireless
communication. I am originally form India and did my bachelors
there. I haven't heard about GNU Radio until a few months back
and I regret for that, as I had more time in my undergrad and
now graduate study is quite intense.
But still I managed to play with GR for few months now and
also trying to build a block for carrier sync for OQPSK
signals.
I saw MIMO transceiver idea in the GSoCOldIdeas page and I
found it interesting and it suits me. I have done projects on
solving problems in MIMO networks but the works were purely
theoretical and simulation based. So I am eager to try out
MIMO stuffs with hardware. As mentioned in the idea, I too
feel that it would be nice for beginners to enjoy the effect
of MIMO practically for a better understanding of the subject.
So a standard gr-mimo module with a simple MRC decoder and a
multi user beamforming encoder would do the job.
I further saw some discussion in the mailing list from 2014
regarding the same idea, and there were concerns (by Micheal
Dickens) about the feasibility and practical difficulties in
implementation as 3 months would not be sufficient. I am a bit
confused as I think 3 months would be sufficient to implement
the stuffs mentioned in the idea, or may be I am missing
something here. I even saw Alick Zhoa and some others saying
that they had already implemented 2x2 MIMO system in GR
without OFDM but might have got obsolete.
However it has been few years since then and I hope someone
could give more insight on implementing a practical MIMO
transceiver and difficulties in it.
So my concerns are
- I would be glad if someone could explain the possible
difficulties in implementing a practical 2x2 MIMO system
in GNU Radio and with USRPs
- Considering the difficulties, is it doable in a span of
3 months?
- If someone had already worked on similar stuffs, their
help would be appreciated.
- Will the standard MIMO module (gr-mimo) be really
beneficial to the project? If not, I would rather work on
it at my leisure than for GSoC as the idea would be less
likely to be accepted.
Regarding the hardware, my university laboratory has several
USRPs and I can use them.
Best regards,
Sakthivel Velumani
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