Re: [Discuss-gnuradio] Received data rate for wifi_rx in gnuradio

[Torell, Kent L]

Well, you could look at the raw data you've captured/processed from the Lime, 
and process a few milliseconds of that.  Plot the amplitude, and you will see 
the bursts of the wifi transmitter.  You can isolate a burst and determine the 
spectral bandwidth to bound the modulation rate, then do some simple 
demodulation to get a better measure of the modulation type (bpsk has only 2 
phases) and rate.  Wireshark will tell you the user data rate, after the 
transport packets are re-assembled after stripping off the header and control 
bits of the physical layer signal.
Kent

-----Original Message-----
From: SG <address@hidden> 
Sent: Wednesday, May 29, 2019 10:10 PM
To: Torell, Kent L <address@hidden>; address@hidden
Subject: Re: [Discuss-gnuradio] Received data rate for wifi_rx in gnuradio

Thanks for your reply.

So in the considered system, transmitter is continuously broadcasting data at 
the rate 5Mbps using ieee802.11 protocol (BPSK modulation is used). The WiFi 
receiver is receiving continuously using LimeSDR Mini and I am trying to 
capture data rate after the decode and demodulation of received signal. It is 
receiving the broadcasted data at a significantly lower rate (based on 
wireshark capture statistics) for which I am unable to identify the reason. So 
I was wondering if looking at wireshark file is an accurate way to approach 
this data-rate calculation problem or something more appropriate exists.

Thanks

SG

On 29/05/19 9:35 PM, Torell, Kent L wrote:
> Wi-fi is short burst messages.   So the modulation data rate is high, but the 
> effective user data rate is low.  'Data rate' is very context dependent.
>
> -----Original Message-----
> From: Discuss-gnuradio 
> <address@hidden> On Behalf Of 
> SG
> Sent: Wednesday, May 29, 2019 1:26 AM
> To: address@hidden
> Subject: [Discuss-gnuradio] Received data rate for wifi_rx in gnuradio
>
> Hi,
>
> I have been wondering and trying to figure out a way to calculate data rate 
> of the wifi_rx.  One way that I thought was to check the captured statistics 
> of the wireshark (.pcap) file generated by wifi_rx. However, these are far 
> lower than the transmitter rate which is set to 5Mbps and the receiver is 
> based on the gr-ieee802.11.
>
> Could anyone point me in the right direction for calculating data-rate in 
> gnuradio.
>
> Thanks
>
> SG
>
>
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