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From: | monika bansal |
Subject: | Re: [Discuss-gnuradio] ofdm_sync and ofdm_sampler blocks |
Date: | Wed, 27 Apr 2016 22:24:03 +0530 |
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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