Header utility for OFDM signals. More...

#include <packet_header_ofdm.h>

Inheritance diagram for gr::digital::packet_header_ofdm:

Public Types
typedef boost::shared_ptr < packet_header_ofdm >	sptr
Public Member Functions
	packet_header_ofdm (const std::vector< std::vector< int > > &occupied_carriers, int n_syms, const std::string &len_tag_key, const std::string &frame_len_tag_key, const std::string &num_tag_key, int bits_per_header_sym, int bits_per_payload_sym)
	~packet_header_ofdm ()
bool	header_parser (const unsigned char *header, std::vector< gr_tag_t > &tags)
	Inverse function to header_formatter().
Static Public Member Functions
static sptr	make (const std::vector< std::vector< int > > &occupied_carriers, int n_syms, const std::string &len_tag_key="packet_len", const std::string &frame_len_tag_key="frame_len", const std::string &num_tag_key="packet_num", int bits_per_header_sym=1, int bits_per_payload_sym=1)
Protected Attributes
pmt::pmt_t	d_frame_len_tag_key
const std::vector< std::vector < int > >	d_occupied_carriers
	Which carriers/symbols carry data.
int	d_syms_per_set
	Helper variable: Total number of elements in d_occupied_carriers.
int	d_bits_per_payload_sym

Detailed Description

Header utility for OFDM signals.

Member Typedef Documentation

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

Reimplemented from gr::digital::packet_header_default.

Constructor & Destructor Documentation

gr::digital::packet_header_ofdm::packet_header_ofdm	(	const std::vector< std::vector< int > > &	occupied_carriers,
		int	n_syms,
		const std::string &	len_tag_key,
		const std::string &	frame_len_tag_key,
		const std::string &	num_tag_key,
		int	bits_per_header_sym,
		int	bits_per_payload_sym
	)

gr::digital::packet_header_ofdm::~packet_header_ofdm ( )

Member Function Documentation

bool gr::digital::packet_header_ofdm::header_parser	(	const unsigned char *	header,
		std::vector< gr_tag_t > &	tags
	)		`[virtual]`

Inverse function to header_formatter().

Does the same as packet_header_default::header_parser(), but adds another tag that stores the number of OFDM symbols in the packet. Note that there is usually no linear connection between the number of OFDM symbols and the packet length, because, a packet might finish mid-OFDM-symbol.

Reimplemented from gr::digital::packet_header_default.

static sptr gr::digital::packet_header_ofdm::make	(	const std::vector< std::vector< int > > &	occupied_carriers,
		int	n_syms,
		const std::string &	len_tag_key = `"packet_len"`,
		const std::string &	frame_len_tag_key = `"frame_len"`,
		const std::string &	num_tag_key = `"packet_num"`,
		int	bits_per_header_sym = `1`,
		int	bits_per_payload_sym = `1`
	)		`[static]`

Parameters:

occupied_carriers	See carrier allocator
n_syms	The number of OFDM symbols the header should be (usually 1)
len_tag_key	The tag key used for the packet length (number of bytes)
frame_len_tag_key	The tag key used for the frame length (number of OFDM symbols, this is the tag key required for the frame equalizer etc.)
num_tag_key	The tag key used for packet numbering.
bits_per_header_sym	Bits per complex symbol in the header, e.g. 1 if the header is BPSK modulated, 2 if it's QPSK modulated etc.
bits_per_payload_sym	Bits per complex symbol in the payload. This is required to figure out how many OFDM symbols are necessary to encode the given number of bytes.