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/*
* iqbal.h
*
* IQ balance correction / estimation utilities
*
* Copyright (C) 2013 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef __OSMO_DSP_IQBAL_H__
#define __OSMO_DSP_IQBAL_H__
/*! \defgroup iqbal IQ balance utilities
* @{
*/
/*! \file iqbal.h
* \brief Osmocom IQ balance utils header
*/
#include <complex.h>
#include <osmocom/dsp/cxvec.h>
/* IQ balance correction and estimation */
void osmo_iqbal_fix(float complex *out, float complex *in, unsigned int len,
float mag, float phase);
struct osmo_cxvec *
osmo_iqbal_cxvec_fix(const struct osmo_cxvec *in, float mag, float phase,
struct osmo_cxvec *out);
float
osmo_iqbal_estimate(const float complex *data,
int fft_size, int fft_count);
float
osmo_iqbal_cxvec_estimate(const struct osmo_cxvec *sig,
int fft_size, int fft_count);
/* IQ balance optimization */
/*! \brief Processing options for the IQ balance optimization algorithm */
struct osmo_iqbal_opts {
int fft_size; /*!< \brief FFT size to use */
int fft_count; /*!< \brief Number of FFT to use */
int max_iter; /*!< \brief Max # iterations per pass */
int start_at_prev; /*!< \brief Use prev values as starting point */
};
extern const struct osmo_iqbal_opts osmo_iqbal_default_opts;
int
osmo_iqbal_cxvec_optimize(const struct osmo_cxvec *sig, float *mag, float *phase,
const struct osmo_iqbal_opts *opts);
/*! @} */
#endif /* __OSMO_DSP_IQBAL_H__ */
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