# Strange peaks in OFDM signal

**URL:** <https://www.ruby-forum.com/t/strange-peaks-in-ofdm-signal/243325>\
**Category:** GNU Radio\
**Created:** [September 16, 2015, 1:04am UTC](https://www.ruby-forum.com/t/strange-peaks-in-ofdm-signal/243325 "2015-09-16T01:04:53Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Sadaf\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/858c86/32.png) [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\
**Post date:** [September 16, 2015, 1:04am UTC](https://www.ruby-forum.com/t/strange-peaks-in-ofdm-signal/243325/1 "2015-09-16T01:04:53Z")

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Hello,  
I’m trying to transmit random data using OFDM system but I have strange  
problem. Like you can see on the picture I attached, there is quite high  
peak in the frequency spectrum (in the red rectangle). I am using OFDM  
example from gr-digital with some changes in options, flow graph  
screenshots are also attached. Any idea how can I get rid of this peak?  
Thanks!