dab_ofdm_ffs_sample Class Reference

samples FFS error estimation at the correct time and averages it More...

#include <dab_ofdm_ffs_sample.h>

Inheritance diagram for dab_ofdm_ffs_sample:

Public Member Functions
float	ffe_estimate ()
int	work (int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)

Friends
dab_ofdm_ffs_sample_sptr	dab_make_ofdm_ffs_sample (unsigned int symbol_length, unsigned int fft_length, unsigned int num_symbols, float alpha, unsigned int sample_rate)

Detailed Description

samples FFS error estimation at the correct time and averages it

Parameters

symbol_length	number of samples in an OFDM symbol
fft_length	number of samples in an OFDM symbol without the cyclic prefix
num_symbols	number of symbols to use for averaging (more symbols is better, but symbols towards the end of the frame tend to have larger time offsets and worse values)
alpha	how fast should we adapt to new FFS error values (1=immediately)
sample_rate	sampling rate - needed to calculate the offset estimation in Hz

input: port 0: float - actual data; port 1: byte - trigger signal indicating the start of a frame output: float fine frequency offset estimation (in radian per sample)

Member Function Documentation

ffe_estimate()

float dab_ofdm_ffs_sample::ffe_estimate ( )

inline

Returns

fine frequency error estimate in Hz

work()

int dab_ofdm_ffs_sample::work	(	int	noutput_items,
		gr_vector_const_void_star &	input_items,
		gr_vector_void_star &	output_items )

Friends And Related Symbol Documentation

dab_make_ofdm_ffs_sample

dab_ofdm_ffs_sample_sptr dab_make_ofdm_ffs_sample ( unsigned int symbol_length, unsigned int fft_length, unsigned int num_symbols, float alpha, unsigned int sample_rate )

friend

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

• dab_ofdm_ffs_sample.h