mirror of https://github.com/pvnis/srsRAN_4G.git
Added AGC module
ismagom
11 years ago
parent
d99e4f5988
commit
ecb30a9014
@ -0,0 +1,69 @@
|
||||
/**
|
||||
*
|
||||
* \section COPYRIGHT
|
||||
*
|
||||
* Copyright 2013-2014 The libLTE Developers. See the
|
||||
* COPYRIGHT file at the top-level directory of this distribution.
|
||||
*
|
||||
* \section LICENSE
|
||||
*
|
||||
* This file is part of the libLTE library.
|
||||
*
|
||||
* libLTE is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU Lesser General Public License as
|
||||
* published by the Free Software Foundation, either version 3 of
|
||||
* the License, or (at your option) any later version.
|
||||
*
|
||||
* libLTE 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 Lesser General Public License for more details.
|
||||
*
|
||||
* A copy of the GNU Lesser General Public License can be found in
|
||||
* the LICENSE file in the top-level directory of this distribution
|
||||
* and at http://www.gnu.org/licenses/.
|
||||
*
|
||||
*/
|
||||
|
||||
|
||||
|
||||
#ifndef AGC_
|
||||
#define AGC_
|
||||
|
||||
#include <stdbool.h>
|
||||
#include <stdint.h>
|
||||
#include <complex.h>
|
||||
|
||||
#include "liblte/config.h"
|
||||
|
||||
/* Automatic Gain Control
|
||||
*
|
||||
*/
|
||||
typedef _Complex float cf_t;
|
||||
|
||||
#define AGC_DEFAULT_BW (1e-2f)
|
||||
|
||||
typedef struct LIBLTE_API{
|
||||
float bandwidth;
|
||||
float gain;
|
||||
float y_out;
|
||||
bool lock;
|
||||
} agc_t;
|
||||
|
||||
LIBLTE_API int agc_init (agc_t *q);
|
||||
|
||||
LIBLTE_API void agc_free(agc_t *q);
|
||||
|
||||
LIBLTE_API void agc_set_bandwidth(agc_t *q,
|
||||
float bandwidth);
|
||||
|
||||
LIBLTE_API float agc_get_rssi(agc_t *q);
|
||||
|
||||
LIBLTE_API void agc_lock(agc_t *q, bool enable);
|
||||
|
||||
LIBLTE_API void agc_push(agc_t *q,
|
||||
cf_t *input,
|
||||
cf_t *output,
|
||||
uint32_t len);
|
||||
|
||||
#endif // AGC_
|
||||
@ -0,0 +1,79 @@
|
||||
/**
|
||||
*
|
||||
* \section COPYRIGHT
|
||||
*
|
||||
* Copyright 2013-2014 The libLTE Developers. See the
|
||||
* COPYRIGHT file at the top-level directory of this distribution.
|
||||
*
|
||||
* \section LICENSE
|
||||
*
|
||||
* This file is part of the libLTE library.
|
||||
*
|
||||
* libLTE is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU Lesser General Public License as
|
||||
* published by the Free Software Foundation, either version 3 of
|
||||
* the License, or (at your option) any later version.
|
||||
*
|
||||
* libLTE 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 Lesser General Public License for more details.
|
||||
*
|
||||
* A copy of the GNU Lesser General Public License can be found in
|
||||
* the LICENSE file in the top-level directory of this distribution
|
||||
* and at http://www.gnu.org/licenses/.
|
||||
*
|
||||
*/
|
||||
|
||||
|
||||
#include <string.h>
|
||||
#include <strings.h>
|
||||
#include <stdlib.h>
|
||||
#include <math.h>
|
||||
#include <complex.h>
|
||||
|
||||
#include "liblte/phy/utils/debug.h"
|
||||
|
||||
#include "liblte/phy/agc/agc.h"
|
||||
#include "liblte/phy/utils/vector.h"
|
||||
#include "liblte/phy/utils/debug.h"
|
||||
|
||||
|
||||
int agc_init (agc_t *q) {
|
||||
bzero(q, sizeof(agc_t));
|
||||
q->bandwidth = AGC_DEFAULT_BW;
|
||||
q->lock = false;
|
||||
q->gain = 1.0;
|
||||
q->y_out = 1.0;
|
||||
return LIBLTE_SUCCESS;
|
||||
}
|
||||
|
||||
void agc_free(agc_t *q) {
|
||||
bzero(q, sizeof(agc_t));
|
||||
}
|
||||
|
||||
void agc_set_bandwidth(agc_t *q, float bandwidth) {
|
||||
q->bandwidth = bandwidth;
|
||||
}
|
||||
|
||||
float agc_get_rssi(agc_t *q) {
|
||||
return 1.0/q->gain;
|
||||
}
|
||||
|
||||
void agc_lock(agc_t *q, bool enable) {
|
||||
q->lock = enable;
|
||||
}
|
||||
|
||||
void agc_push(agc_t *q, cf_t *input, cf_t *output, uint32_t len) {
|
||||
|
||||
// Apply current gain to input signal
|
||||
vec_sc_prod_cfc(input, q->gain, output, len);
|
||||
|
||||
// compute output energy estimate
|
||||
float y = sqrtf(crealf(vec_dot_prod_conj_ccc(output, output, len))/len);
|
||||
|
||||
q->y_out = (1-q->bandwidth) * q->y_out + q->bandwidth * y;
|
||||
if (!q->lock) {
|
||||
q->gain *= expf(-0.5*q->bandwidth*logf(q->y_out));
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue