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open-sdr / openwifi-hw

open-source IEEE 802.11 WiFi baseband FPGA (chip) design: FPGA, hardware
GNU Affero General Public License v3.0
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Data format of IQ #18

Closed hyanki closed 3 years ago

hyanki commented 3 years ago

Hi I want to know that what is data format of IQ in 16 bit in receive side? In demodulater.v why scaling is taken 1024 though input is in 16 bit? Regards J S Hyanki

JiaoXianjun commented 3 years ago

You can read document of openofdm: https://openofdm.readthedocs.io/en/latest/

hyanki commented 3 years ago

Hi jiao Basically in demodulate.v , input is 16 bit but for demaping max value is taken 1024 which is 10 bit. Why? Regards J S Hyanki

On Fri, 31 Jul 2020, 17:34 Jiao Xianjun, notifications@github.com wrote:

You can read document of openofdm: https://openofdm.readthedocs.io/en/latest/

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JiaoXianjun commented 3 years ago

because the signal is scaled to that range by the processing steps.

hyanki commented 3 years ago

You mean output of FFT block.

On Fri, 31 Jul 2020, 19:13 Jiao Xianjun, notifications@github.com wrote:

because the signal is scaled to that range by the processing steps.

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JiaoXianjun commented 3 years ago

Could be. And also equalization.

hyanki commented 3 years ago

So maximum value coming from fft block is 1024.

On Fri, 31 Jul 2020, 19:52 Jiao Xianjun, notifications@github.com wrote:

Could be. And also equalization.

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JiaoXianjun commented 3 years ago

from euqalization module. Fft output is not fed to demodulate module directly. There is a equalisation module before the demodulation.

1024 is just a reference amplitude to decide the decision threshold inside demodulation.

hyanki commented 3 years ago

Ok. I want to know that how much doppler can cope this ref design?

On Fri, 31 Jul 2020, 20:14 Jiao Xianjun, notifications@github.com wrote:

from euqalization module. Fft output is not fed to demodulate module directly. There is a equalisation module before the demodulation.

1024 is just a reference amplitude to decide the decision threshold inside demodulation.

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JiaoXianjun commented 3 years ago

We never test this. I think it should be like several 10KHz.

hyanki commented 3 years ago

Ok Thanks for your support. Regards

On Fri, 31 Jul 2020, 21:14 Jiao Xianjun, notifications@github.com wrote:

We never test this. I think it should be like several 10KHz.

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JiaoXianjun commented 3 years ago

Hello,

Would you please tell us your email? If you could also introduce yourself bit (student? Company? University?), that would be perfect. We might send out some questions to listen for user feed feedback.

Thanks.

hyanki commented 3 years ago

Hi My mail id is hyankijitu@gmail.com Regards J S Hyanki

On Sat, 1 Aug 2020, 01:14 Jiao Xianjun, notifications@github.com wrote:

Hello,

Would you please tell us your email? If you could also introduce yourself bit (student? Company? University?), that would be perfect. We might send out some questions to listen for user feed feedback.

Thanks.

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/open-sdr/openwifi-hw/issues/18#issuecomment-667319626, or unsubscribe https://github.com/notifications/unsubscribe-auth/AC2RBWKL3BQXQUQKPE52QFDR6MNJZANCNFSM4PFZAGNQ .

JiaoXianjun commented 3 years ago

Thanks!