Re: [Discuss-gnuradio] Measuring RSS during packet reception

[Adeel Anwar]

Nemanja,

I built this block sometime back. The ideas is to construct a custom RSSI Measurement block having input

1: complex IQ-samples after USRP-SRC or before "AGC"

2: byte-stream after "digital_correlate_access_code_bb". Output byte stream has data in LSB (1st bit) while Flag in 2nd bit shows header detection)


3: Calculate system/filters group-delay between the complex-IQ samples stream and output-of-correlate-access-code. This delay will depend on the
  a) No. of filters in system e.g. FLL-Filter, PFB-Timing-Synch etc
  b) No. of filter Taps


3: Delay the complex IQ-samples stream by amount calculated in 3


4: In Custom RSSI-Measurement Block use following logic


    if (2-bit of correlate-access-code-stream) is High:


        Take average of N-items from IQ-samples stream



where "N" depends on
   a) No of symbol in packet  


   b) Samples-per-Symbol



Hope this helps



-Adeel





On Wed, Jul 17, 2013 at 12:36 AM, Nemanja Savic <address@hidden> wrote:

This looks a bit silly cause I am speaking with myself. Anyway, maybe I can do something with probe_avg_mag_sqr, but maybe somebody can tell me how can I access that block's values from another block?

Best,
Nemanja

On Tue, Jul 16, 2013 at 3:16 PM, Nemanja Savic <address@hidden> wrote:

The only way that is on my mind is to detect burst and store it in a file, and then to send a message to the block that will read that file, and in case of successfull demodulation and decoding to calcualte signal power, but it looks pretty robust and non elegant.

Cheers,
Nemanja

On Tue, Jul 16, 2013 at 2:26 PM, Nemanja Savic <address@hidden> wrote:

Any suggestions on this topic, opinions?

Best

Nemanja

On Tue, Jul 9, 2013 at 4:23 PM, Nemanja Savic <address@hidden> wrote:

Hi again gnuradioers,

as always, I would like to ask for your opinion before starting to write my own block.

Basically, I would like to add a feature to my receiver to be able to calculate average signal strength during signal reception. When I receive a valid packet I would like to have a RSS value. My question is what is the best way to accomplish this in GNURADIO? Using tags or messages, ...? IS there anything similar already provided so that I can take a look?

Thank you and best

--
Nemanja Savić

--
Nemanja Savić

--
Nemanja Savić

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Nemanja Savić

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