# Do anyone know how to add pilot to sub-carrier in benchmark ofdm example? **URL:** \ **Category:** GNU Radio\ **Created:** [August 27, 2013, 1:05pm UTC](https://www.ruby-forum.com/t/do-anyone-know-how-to-add-pilot-to-sub-carrier-in-benchmark-ofdm-example/236333 "2013-08-27T13:05:44Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Post date:** [August 27, 2013, 1:05pm UTC](https://www.ruby-forum.com/t/do-anyone-know-how-to-add-pilot-to-sub-carrier-in-benchmark-ofdm-example/236333/1 "2013-08-27T13:05:44Z")
Hi guys, Thanks in advance. I am currently using Gnuradio 3.6. I want to use pilot to trace the phase offset in each ofdm symbol. However, I cannot see any pilot is added in ofdm benchmark example. Is there any example or project that has already implemented pilot to trace phase offset? If no, which block should I locate to do the least modification. Appreciate your great help. Best, Kay ---
**Author:** ![Yingjie\_C](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/f14d63/32.png) [@Yingjie\_C](https://www.ruby-forum.com/u/Yingjie_C)\ **Post date:** [August 27, 2013, 1:54pm UTC](https://www.ruby-forum.com/t/do-anyone-know-how-to-add-pilot-to-sub-carrier-in-benchmark-ofdm-example/236333/2 "2013-08-27T13:54:49Z")
On Tue, Aug 27, 2013 at 07:04:21PM +0800, Yingjie C. wrote: > Thanks in advance. > > I am currently using Gnuradio 3.6. I want to use pilot to trace the phase > offset in each ofdm symbol. However, I cannot see any pilot is added in ofdm > benchmark example. Is there any example or project that has already implemented > pilot to trace phase offset? If no, which block should I locate to do the least > modification. There is a detailed explanation in the manual. [http://gnuradio.org/doc/doxygen/page\_ofdm.html](http://gnuradio.org/doc/doxygen/page_ofdm.html) MB – Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin B. Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT – University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association ---
**Author:** ![Yingjie\_C](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/f14d63/32.png) [@Yingjie\_C](https://www.ruby-forum.com/u/Yingjie_C)\ **Post date:** [August 27, 2013, 2:01pm UTC](https://www.ruby-forum.com/t/do-anyone-know-how-to-add-pilot-to-sub-carrier-in-benchmark-ofdm-example/236333/3 "2013-08-27T14:01:15Z")
Thanks for you reply, Martin. But seem some blocks in GRC example is not compatible with the blocks in original benchmark ofdm example, I am supposed that I need major modification if I use it. 2013/8/27 Martin B. (CEL) [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![Yingjie\_C](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/f14d63/32.png) [@Yingjie\_C](https://www.ruby-forum.com/u/Yingjie_C)\ **Post date:** [August 28, 2013, 9:17am UTC](https://www.ruby-forum.com/t/do-anyone-know-how-to-add-pilot-to-sub-carrier-in-benchmark-ofdm-example/236333/4 "2013-08-28T09:17:40Z")
On Tue, Aug 27, 2013 at 07:59:48PM +0800, Yingjie C. wrote: > Thanks for you reply, Martin. But seem some blocks in GRC example is not > compatible with the blocks in original benchmark ofdm example, I am supposed > that I need major modification if I use it. Yes, that’s right. ## MB Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin B. Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT – University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association