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Re: [Discuss-gnuradio] Packet Loss Rate/Bit Error Rate

From: kaleem ahmad
Subject: Re: [Discuss-gnuradio] Packet Loss Rate/Bit Error Rate
Date: Fri, 25 Jul 2008 09:45:55 -0700 (PDT)

I am using RFX2400 daughter boards,
VERT2450 antenna which I received with my USRP from ettus,
I have tried different bitrates from 40kbps - 100kbps but got same results,
I am not observing any overrun or underrun,
I am working in office environment where I dont have any interference
Gain = 0, but I have tried other values [0-20].


George Nychis wrote:
> kaleem ahmad wrote:
>> If someone has ever measured Quality of service of received data (using
>> any
>> modulation and daughter board but preferably RFX2400) in terms of packet
>> loss rate/Bit Error Rate (or any other metric) with USRP & GNU Radio
>> without
>> any error correction (ARQ,FEC) mechanism (but no problem if you have with
>> error correction mechnism) then please share your results here. 
>> Actually without and error correction mechanism, with FSK, I am getting
>> almost half of my data lost. I was thinking that it may be improved by
>> adding some error correction mechanism. Or this high data loss is because
>> of
>> some implementation errors...What do you say ??????????
> We have no idea what your actual setup is, so we have no clue whether or 
> not error correction will truly help you.
> It's like saying my computer crashed, and asking if a new hard drive 
> will help.  Who knows, it all depends :)
> Some questions that might help:
>   - are you using coax?
>   - are you using antennas?
>   - what kind of gain are you using?
>   - what kind of physical conditions?
>   - what bitrate are you using?
>   - are you seeing underruns at your receiver?
> - George
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> Discuss-gnuradio mailing list
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