Re: [Discuss-gnuradio] ofdm_sync and ofdm_sampler blocks

[monika bansal]

Hi, Martin

Thanks. I will move to the new blocks. But if someone have encountered this kind of problem please let me know.

Regards,

- Monika

On Wed, Apr 27, 2016 at 9:58 PM, Martin Braun <address@hidden> wrote:

Monika,

please be patient on this list. Also, the blocks you mention are very
old and not actively developed/maintained. I recommend switching to the
ofdm_tx and ofdm_rx blocks.

Cheers,
Martin

On 04/27/2016 04:09 AM, monika bansal wrote:
> Please help me with this.
>
> Thanks.
>
> Regards,
> -monika
>
> On Wed, Apr 27, 2016 at 4:37 PM, monika bansal <address@hidden
> <mailto:address@hidden>> wrote:
>
>     Hi,
>
>     I have connected benchmark_tx.py and benchmark_rx.py to make it
>     loopback mode without USRPs. There is no channel block between the
>     tx and rx chain.
>
>     I checked all blocks in the Transmit chain. All are working as
>     expected. But in Receiver chain i did not understand the output of
>     /ofdm_sync_ml /and /digital.ofdm_sampler / blocks.
>
>     I tried checking the output of port 1 of ofdm_sync. The sync signal
>     is one on the following indexes:
>     * 714,   7109,  13515,  19911,  26308,  32705,  39115,  45515,*
>     *        51910,  58315,  64715,  71115,  77515,  83915,  90315,  96712,*
>     *       103115, 109512, 115910, 122315, 128715, 135113, 141510, 147915,*
>     *       154288, 160711, 167112, 173515, 179912, 186315*
>     *
>     *
>     I checked the output of port 1 of ofdm_sampler. The sync signal is
>     one on the following indexes:
>     *0,   5120,  10752,  15872,  20992,  26112,  31744,  36864,*
>     *        41984,  47616,  52736,  57856,  62976,  68096,  73216,  78336,*
>     *        83968,  89088,  94208,  99840, 104960, 110080, 115200, 120832,*
>     *       125952, 131584, 136704, 142336, 147456, 153088*
>     *
>     *
>     *I expected the output of *port 1 of ofdm_sync to be 639, 639+6400,
>     639+12800 , ...
>     and output of  port 1 of ofdm_sampler to be 0, 5120, 5120*2, 5120*3,
>     ....
>
>     General parameters are as follows:
>     fft_len = 512
>     cp_len = 128
>     occupied_tones = 200
>     modulation = bpsk
>     pkt_size = 200 bytes
>     after CRC and Header pkt_length = 209 bytes
>     1 sync word for each packet
>
>     Finally there will be 10 OFDM symbols per pkt and 512+128 = 640
>     complex symbols per OFDM symbol.
>
>
>
>
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