Re: [Discuss-gnuradio] Data loss in transmission over the air

[Marcus Müller]

Hi Israel,

well, the packet decoder will drop any packet it can't properly decode. Since you don't have perfect transmission, some packets will be not decodable.
You will have to tweak the parameters of your transmission to increase its robustness. Since you don't show how you actually do the transmission, it's hard to advice, but generally, all your digital communication theory knowledge applies, so use as much power as feasible, increase E_b by decreasing symbol rate, make sure you account for possible frequency offsets, apply channel coding, do timing recovery etc, the whole book, one by one. By successively decreasing your packet error rate, you will build a better transceiver :)

Best regards,
Marcus

On 09.11.2015 19:24, Israel . wrote:

Hi,

I’m working on my degree final project and I would like to implement a wireless communications system between two USRPs (N200). One of the main goals is to be able to transmit a file (image, doc, video, …) and to receive it correctly (or, at least, to receive the complete file). My question is if I can do this with GNU Radio. I have tried it for a long time (with File Source, File Sink blocks) and I always lose data in the process. I’ve read quite solutions in the mailing list about other people who had the same problem, but none have worked for me.

I attached a picture of my flowgraph. It is made in a virtualization environment, however, when I work in the real environment (using the USPRs), I keep losing data.

On the other hand, if there is another way to transmit and to receive a file (for example, without using File Source and File Sink), I would also like to know.

I really appreciate any help

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