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130 lines
5.2 KiB
C
130 lines
5.2 KiB
C
/**
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* Copyright 2013-2022 Software Radio Systems Limited
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*
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* This file is part of srsRAN.
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*
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* srsRAN is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsRAN is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#ifndef SRSRAN_WIENER_DL_H_
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#define SRSRAN_WIENER_DL_H_
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#include <srsran/config.h>
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#include <srsran/phy/common/phy_common.h>
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#include <srsran/phy/dft/dft.h>
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#include <srsran/phy/utils/random.h>
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// Constant static parameters
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#define SRSRAN_WIENER_DL_HLS_FIFO_SIZE (8U)
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#define SRSRAN_WIENER_DL_MIN_PRB (4U)
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#define SRSRAN_WIENER_DL_MIN_RE (SRSRAN_WIENER_DL_MIN_PRB * SRSRAN_NRE)
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#define SRSRAN_WIENER_DL_MIN_REF (SRSRAN_WIENER_DL_MIN_PRB * 2U)
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#define SRSRAN_WIENER_DL_TFIFO_SIZE (2U)
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#define SRSRAN_WIENER_DL_XFIFO_SIZE (400U)
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#define SRSRAN_WIENER_DL_TIMEFIFO_SIZE (32U)
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#define SRSRAN_WIENER_DL_CXFIFO_SIZE (400U)
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typedef struct {
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cf_t* hls_fifo_1[SRSRAN_WIENER_DL_HLS_FIFO_SIZE]; // Least square channel estimates on odd pilots
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cf_t* hls_fifo_2[SRSRAN_WIENER_DL_HLS_FIFO_SIZE]; // Least square channel estimates on even pilots
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cf_t* tfifo[SRSRAN_WIENER_DL_TFIFO_SIZE]; // memory for time domain channel linear interpolation
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cf_t* xfifo[SRSRAN_WIENER_DL_XFIFO_SIZE]; // fifo for averaging the frequency correlation vectors
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cf_t cV[SRSRAN_WIENER_DL_MIN_RE]; // frequency correlation vector among all subcarriers
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float deltan; // step within time domain linear interpolation
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uint32_t nfifosamps; // number of samples inside the fifo for averaging the correlation vectors
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float invtpilotoff; // step for time domain linear interpolation
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cf_t* timefifo; // fifo for storing single frequency channel time domain evolution
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cf_t* cxfifo[SRSRAN_WIENER_DL_CXFIFO_SIZE]; // fifo for averaging time domain channel correlation vector
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uint32_t sumlen; // length of dynamic average window for time domain channel correlation vector
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uint32_t skip; // pilot OFDM symbols to skip when training Wiener matrices (skip = 1,..,4)
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uint32_t cnt; // counter for skipping pilot OFDM symbols
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} srsran_wiener_dl_state_t;
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typedef struct {
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// Maximum allocated number of...
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uint32_t max_prb; // Resource Blocks
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uint32_t max_ref; // Reference signals
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uint32_t max_re; // Resource Elements (equivalent to sub-carriers)
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uint32_t max_tx_ports; // Tx Ports
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uint32_t max_rx_ant; // Rx Antennas
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// Configured number of...
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uint32_t nof_prb; // Resource Blocks
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uint32_t nof_ref; // Reference signals
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uint32_t nof_re; // Resource Elements (equivalent to sub-carriers)
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uint32_t nof_tx_ports; // Tx Ports
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uint32_t nof_rx_ant; // Rx Antennas
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// One state per possible channel (allocated in init)
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srsran_wiener_dl_state_t* state[SRSRAN_MAX_PORTS][SRSRAN_MAX_PORTS];
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// Wiener matrices
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cf_t wm1[SRSRAN_WIENER_DL_MIN_RE][SRSRAN_WIENER_DL_MIN_REF];
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cf_t wm2[SRSRAN_WIENER_DL_MIN_RE][SRSRAN_WIENER_DL_MIN_REF];
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bool wm_computed;
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bool ready;
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// Calculation support
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cf_t hlsv[SRSRAN_WIENER_DL_MIN_RE];
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cf_t hlsv_sum[SRSRAN_WIENER_DL_MIN_RE];
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cf_t acV[SRSRAN_WIENER_DL_MIN_RE];
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union {
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cf_t m[SRSRAN_WIENER_DL_MIN_REF][SRSRAN_WIENER_DL_MIN_REF];
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cf_t v[SRSRAN_WIENER_DL_MIN_REF * SRSRAN_WIENER_DL_MIN_REF];
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} RH;
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union {
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cf_t m[SRSRAN_WIENER_DL_MIN_REF][SRSRAN_WIENER_DL_MIN_REF];
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cf_t v[SRSRAN_WIENER_DL_MIN_REF * SRSRAN_WIENER_DL_MIN_REF];
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} invRH;
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cf_t hH1[SRSRAN_WIENER_DL_MIN_RE][SRSRAN_WIENER_DL_MIN_REF];
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cf_t hH2[SRSRAN_WIENER_DL_MIN_RE][SRSRAN_WIENER_DL_MIN_REF];
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// Temporal vector
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cf_t* tmp;
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// Random generator
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srsran_random_t random;
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// FFT/iFFT
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srsran_dft_plan_t fft;
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srsran_dft_plan_t ifft;
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cf_t filter[SRSRAN_WIENER_DL_MIN_RE];
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// Matrix inverter
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void* matrix_inverter;
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} srsran_wiener_dl_t;
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SRSRAN_API int
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srsran_wiener_dl_init(srsran_wiener_dl_t* q, uint32_t max_prb, uint32_t max_tx_ports, uint32_t max_rx_ant);
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SRSRAN_API int srsran_wiener_dl_set_cell(srsran_wiener_dl_t* q, srsran_cell_t cell);
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SRSRAN_API void srsran_wiener_dl_reset(srsran_wiener_dl_t* q);
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SRSRAN_API int srsran_wiener_dl_run(srsran_wiener_dl_t* q,
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uint32_t tx,
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uint32_t rx,
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uint32_t m,
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uint32_t shift,
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cf_t* pilots,
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cf_t* estimated,
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float snr_lin);
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SRSRAN_API void srsran_wiener_dl_free(srsran_wiener_dl_t* q);
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#endif // SRSRAN_WIENER_DL_H_
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