Re: [Discuss-gnuradio] XFDMSync and gr-gfdm

[Johannes Demel]

Hi Satish,

I didn't receive your mail through the mailing list. I wonder if anyone 
else did? Anyways, I just post my answer to the mailing list so others 
may benefit as well.

First off, there is a `convert38` branch in both repos that enables you 
to use `gr-gfdm` and `XFDMSync` with GNU Radio 3.8. These branches got 
some additional bugfixes and some clean-up. I'd just recommend to use 
these branches now.

I just pushed a new commit to the repo with an updated flowgraph. Of 
course everything is on `convert38` and thus you need to use it with GNU 
Radio 3.8.

It is always useful to have some form of CRC check. Usually you'd use 
some FEC as well. Though, this is left out in the example flowgraph.

Cheers
Johannes

On 22.09.19 17:26, Satish Kolli wrote:
> Mr.Demel,
> 
> I hope you are doing great. I sent the following to the 
> 'discuss-gnuradio' per your direction last time and just want to bring 
> it to your attention, if you can help. Thank you very much.
> 
> Satish
> 
> ------------------------------------------------------------------------
> *From:* Satish Kolli
> *Sent:* Sunday, September 22, 2019 11:21 AM
> *To:* address@hidden <address@hidden>
> *Subject:* XFDMSync and gr-gfdm
> Hello,
> 
> I am using XFDMSync and gr-gfdm from the following github.
> 
> https://github.com/jdemel/XFDMSync
> https://github.com/jdemel/gr-gfdm
> 
> I am generating a fixed byte message (ex: "AAAAAA|timestamp") and 
> sending it through USRP (tried with N200 and X310). I am able to 
> successfully transmit and receive but the messages on the receiver end 
> are interleaved (meaning some message don't start exactly with my AAAA 
> prefix, part of previous message and part of next message gets written 
> to my Sync). I noticed that the first few messages are always printed as 
> garbled characters at my Sync.
> 
> I augmented gfdm_ota_demo.grc 
> <https://github.com/jdemel/gr-gfdm/blob/master/examples/gfdm_ota_demo.grc> 
> (https://github.com/jdemel/gr-gfdm/blob/master/examples/gfdm_ota_demo.grc) 
> with 
> my source that generates the messages and added a sync to capture the 
> messages.
> 
> Any insight/help is greatly appreciated. Thank you.
> 
> Satish
> 
>