# OFDM\_Cyclic\_Prefixer

**URL:** <https://www.ruby-forum.com/t/ofdm-cyclic-prefixer/230131>\
**Category:** GNU Radio\
**Created:** [June 2, 2014, 2:55am UTC](https://www.ruby-forum.com/t/ofdm-cyclic-prefixer/230131 "2014-06-02T02:55:08Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jason\_sam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/7993a0/32.png) [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\
**Post date:** [June 2, 2014, 2:55am UTC](https://www.ruby-forum.com/t/ofdm-cyclic-prefixer/230131/1 "2014-06-02T02:55:08Z")

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**Author:** ![xianda](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/x/b38774/32.png) [@xianda](https://www.ruby-forum.com/u/xianda)\
**Post date:** [June 2, 2014, 4:14am UTC](https://www.ruby-forum.com/t/ofdm-cyclic-prefixer/230131/2 "2014-06-02T04:14:09Z")

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If the rolloff parameter is zero, the block does not  
do any pulse shaping. The rolloff parameter is in  
symbols, and must be at least 2 and less than or  
equal to CP length.

Ron

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**Author:** ![xianda](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/x/b38774/32.png) [@xianda](https://www.ruby-forum.com/u/xianda)\
**Post date:** [June 2, 2014, 8:51am UTC](https://www.ruby-forum.com/t/ofdm-cyclic-prefixer/230131/3 "2014-06-02T08:51:49Z")

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On 06/02/2014 04:13 AM, Ron E. wrote:

> If the rolloff parameter is zero, the block does not  
> do any pulse shaping. The rolloff parameter is in  
> symbols, and must be at least 2 and less than or  
> equal to CP length.

Thanks Ron, that’s correct – just a technicality: The rolloff is in  
_samples_.

M