gr::digital::ofdm_cyclic_prefixer Class Reference

Adds a cyclic prefix and performs pulse shaping on OFDM symbols. More...

#include <ofdm_cyclic_prefixer.h>

Inheritance diagram for gr::digital::ofdm_cyclic_prefixer:

List of all members.

Public Types
typedef boost::shared_ptr < ofdm_cyclic_prefixer >	sptr
Static Public Member Functions
static sptr	make (size_t input_size, size_t output_size, int rolloff_len=0, const std::string &len_tag_key="")

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Detailed Description

Adds a cyclic prefix and performs pulse shaping on OFDM symbols.

Input: OFDM symbols (in the time domain, i.e. after the IFFT). Optionally, entire frames can be processed. In this case, len_tag_key must be specified which holds the key of the tag that denotes how many OFDM symbols are in a frame. Output: A stream of (scalar) complex symbols, which include the cyclic prefix and the pulse shaping. Note: If complete frames are processed, and rolloff_len is greater than zero, the final OFDM symbol is followed by the delay line of the pulse shaping.

The pulse shape is a raised cosine in the time domain.

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Member Typedef Documentation

typedef boost::shared_ptr<ofdm_cyclic_prefixer> gr::digital::ofdm_cyclic_prefixer::sptr

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Member Function Documentation

static sptr gr::digital::ofdm_cyclic_prefixer::make	(	size_t	input_size,
		size_t	output_size,
		int	rolloff_len = 0,
		const std::string &	len_tag_key = ""
	)		[static]

Parameters:

input_size	FFT length (i.e. length of the OFDM symbols)
output_size	FFT length + cyclic prefix length (in samples)
rolloff_len	Length of the rolloff flank in samples
len_tag_key	For framed processing the key of the length tag

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The documentation for this class was generated from the following file:

• ofdm_cyclic_prefixer.h