# Pad source&&Wifi physical layer input/output **URL:** \ **Category:** GNU Radio\ **Created:** [April 16, 2014, 4:27am UTC](https://www.ruby-forum.com/t/pad-source-wifi-physical-layer-input-output/240476 "2014-04-16T04:27:28Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Post date:** [April 16, 2014, 4:27am UTC](https://www.ruby-forum.com/t/pad-source-wifi-physical-layer-input-output/240476/1 "2014-04-16T04:27:28Z")
Hi,GR I run Bloessl’s “802.11 OFDM physical layer” GRC program. The input and output block are “Pad source” block. What is the funcion of “Pad source”,how to use “Pad source”? If I want to use “File source” block to be the data input and output,how can I connect “File source” with the system? Best, Regards Owen Zhang ---
**Author:** ![zhangwen](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/8e7dd6/32.png) [@zhangwen](https://www.ruby-forum.com/u/zhangwen)\ **Post date:** [April 16, 2014, 4:35am UTC](https://www.ruby-forum.com/t/pad-source-wifi-physical-layer-input-output/240476/2 "2014-04-16T04:35:44Z")
The GRC Program Picture in attachment. -----ԭʼʼ----- : zhangwen [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ʱ: 2014416 ռ: “GnuRadio Receiver” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) : : [Discuss-gnuradio] pad source&&Wifi physical layer input/output Hi,GR I run Bloessl’s “802.11 OFDM physical layer” GRC program. The input and output block are “Pad source” block. What is the funcion of “Pad source”,how to use “Pad source”? If I want to use “File source” block to be the data input and output,how can I connect “File source” with the system? Best, Regards Owen Zhang ---
**Author:** ![zhangwen](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/8e7dd6/32.png) [@zhangwen](https://www.ruby-forum.com/u/zhangwen)\ **Post date:** [April 16, 2014, 10:34pm UTC](https://www.ruby-forum.com/t/pad-source-wifi-physical-layer-input-output/240476/3 "2014-04-16T22:34:36Z")
Thank you nathan I have found another flow graph to implement the whole process of Wifi which contains hier block. But I want to insert my own signal process block in pyhsical hier flow graph. Is there any way to use pyhsical hier flow graph only? Best, Regards Owen Zhang ---
**Author:** ![zhangwen](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/8e7dd6/32.png) [@zhangwen](https://www.ruby-forum.com/u/zhangwen)\ **Post date:** [June 4, 2014, 8:25am UTC](https://www.ruby-forum.com/t/pad-source-wifi-physical-layer-input-output/240476/4 "2014-06-04T08:25:03Z")
Hi, I have no idea how to run Bloessl’s “802.11 OFDM physical layer” GRC program wifi\_phy\_hier.grc;how can i connect “vector source” or “file source” with the wifi\_phy\_hier.grc? Thank you so much! Best, Regarts ubcubc ---
**Author:** ![zhangwen](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/8e7dd6/32.png) [@zhangwen](https://www.ruby-forum.com/u/zhangwen)\ **Post date:** [April 17, 2014, 12:09am UTC](https://www.ruby-forum.com/t/pad-source-wifi-physical-layer-input-output/240476/5 "2014-04-17T00:09:34Z")
On 2014-04-16 05:30, zhangwen wrote: > Thank you nathan！ > I have found another flow graph to implement the whole process of Wifi > which contains hier block. > But I want to insert my own signal process block in pyhsical hier flow > graph. > Is there any way to use pyhsical hier flow graph only? The hier flow graph has dummy inputs and outputs so you can not run it on its own. It is intended to be used by another flow graph. But you can change the hier flow graph according to your needs, build it, and then re-run the other flow graph that contains the hier block. Best, Bastian > > 收件人: zhangwen \<[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) [mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)\> > > > > > 发送时间: 2014年4月16日 星期三 > > > The input and output block are “Pad source” block. > > * * * > > Discuss-gnuradio mailing list > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio) – Dipl.-Inform. Bastian B. Distributed Embedded Systems University of Paderborn, Germany > **[Home](https://www.bastibl.net/)** > > I'm Bastian Bloessl, a Research Group Leader at the Secure Mobile Networking Lab, TU Darmstadt. Checkout my blog, projects, publications, and resume; or connect on Github, Twitter, YouTube, or Facebook.