Thanks Marcus - that helps.
Could you please let me know what's the bandwidth of each sub-carrier? How
can I calculate that and reconfigure the same?
On Sat, Jun 18, 2016 at 12:50 AM, Marcus Müller <marcus.muel...@ettus.com>
wrote:
> Hi Avinash,
>
> On 06/16/2016 03:29 PM, avinash kalyanaraman wrote:
>
> i) These 64 complex values (a + ib) represent the 64 sub-carriers and I
> can get the amplitude and phase of each sub-carrier as sqrt( a^2 + b^2) and
> arctan(b/a) respectively ?
>
> Yes.
>
>
> ii) I see that the CSI calculation is per tag. I understand from your link
> that the tag represents additional information/metadata attached to a
> specific item. However, in this case, I am unsure what a tag denotes? In
> other words, could you please tell me what a “tag” is being attached to
> here, on which a channel estimate is calculated?
>
> If I remember correctly:
> To the first sample of the "chunk" of samples that were used for
> estimation, that is, on the first sample of the OFDM symbol.
>
> I do think that if you're into channel estimation, reading the source code
> is very much worth your time, and you'll notice variable and method names
> were chosen sensibly to make understanding what's happening easier. Go for
> the get_chan_taps() method in ofdm_chanest_vcvc_impl.cc; you'll find it in
> your GNU Radio source tree; be sure to use a recent version of GNU Radio
> (3.7.7 or later).
>
>
> iii) Please let me know what is the unit of rx_time ? Seconds?
> Offset: 76 Source: n/a Key: rx_time Value: {7 0.303}
> Offset: 77 Source: n/a Key: rx_time Value: {7 0.399}
>
> http://gnuradio.org/doc/doxygen/page_uhd.html
>
> look for "timestamp" on that page.
>
> Best regards,
> Marcus
>
--
Avinash
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