Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Multi-carrier radio interface |
| 3 | * |
Pau Espin Pedrol | 4644463 | 2018-09-03 16:42:04 +0200 | [diff] [blame] | 4 | * Copyright (C) 2016 Ettus Research LLC |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 5 | * |
| 6 | * Author: Tom Tsou <tom.tsou@ettus.com> |
| 7 | * |
Pau Espin Pedrol | 21d03d3 | 2019-07-22 12:05:52 +0200 | [diff] [blame] | 8 | * SPDX-License-Identifier: AGPL-3.0+ |
| 9 | * |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 10 | * This program is free software: you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU Affero General Public License as published by |
| 12 | * the Free Software Foundation, either version 3 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU Affero General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU Affero General Public License |
| 21 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 22 | * See the COPYING file in the main directory for details. |
| 23 | */ |
| 24 | |
| 25 | #include <radioInterface.h> |
| 26 | #include <Logger.h> |
| 27 | |
| 28 | #include "Resampler.h" |
| 29 | |
| 30 | extern "C" { |
| 31 | #include "convert.h" |
| 32 | } |
| 33 | |
| 34 | /* Resampling parameters for 64 MHz clocking */ |
| 35 | #define RESAMP_INRATE 65 |
| 36 | #define RESAMP_OUTRATE (96 / 2) |
| 37 | |
| 38 | /* Universal resampling parameters */ |
| 39 | #define NUMCHUNKS 24 |
| 40 | |
| 41 | #define MCHANS 4 |
| 42 | |
| 43 | RadioInterfaceMulti::RadioInterfaceMulti(RadioDevice *radio, size_t tx_sps, |
| 44 | size_t rx_sps, size_t chans) |
| 45 | : RadioInterface(radio, tx_sps, rx_sps, chans), |
| 46 | outerSendBuffer(NULL), outerRecvBuffer(NULL), |
| 47 | dnsampler(NULL), upsampler(NULL), channelizer(NULL), synthesis(NULL) |
| 48 | { |
| 49 | } |
| 50 | |
| 51 | RadioInterfaceMulti::~RadioInterfaceMulti() |
| 52 | { |
| 53 | close(); |
| 54 | } |
| 55 | |
| 56 | void RadioInterfaceMulti::close() |
| 57 | { |
| 58 | delete outerSendBuffer; |
| 59 | delete outerRecvBuffer; |
| 60 | delete dnsampler; |
| 61 | delete upsampler; |
| 62 | delete channelizer; |
| 63 | delete synthesis; |
| 64 | |
| 65 | outerSendBuffer = NULL; |
| 66 | outerRecvBuffer = NULL; |
| 67 | dnsampler = NULL; |
| 68 | upsampler = NULL; |
| 69 | channelizer = NULL; |
| 70 | synthesis = NULL; |
| 71 | |
| 72 | mReceiveFIFO.resize(0); |
| 73 | powerScaling.resize(0); |
| 74 | history.resize(0); |
| 75 | active.resize(0); |
| 76 | |
| 77 | RadioInterface::close(); |
| 78 | } |
| 79 | |
| 80 | static int getLogicalChan(size_t pchan, size_t chans) |
| 81 | { |
| 82 | switch (chans) { |
| 83 | case 1: |
| 84 | if (pchan == 0) |
| 85 | return 0; |
| 86 | else |
| 87 | return -1; |
| 88 | break; |
| 89 | case 2: |
| 90 | if (pchan == 0) |
| 91 | return 0; |
| 92 | if (pchan == 3) |
| 93 | return 1; |
| 94 | else |
| 95 | return -1; |
| 96 | break; |
| 97 | case 3: |
| 98 | if (pchan == 1) |
| 99 | return 0; |
| 100 | if (pchan == 0) |
| 101 | return 1; |
| 102 | if (pchan == 3) |
| 103 | return 2; |
| 104 | else |
| 105 | return -1; |
| 106 | break; |
| 107 | default: |
| 108 | break; |
| 109 | }; |
| 110 | |
| 111 | return -1; |
| 112 | } |
| 113 | |
| 114 | static int getFreqShift(size_t chans) |
| 115 | { |
| 116 | switch (chans) { |
| 117 | case 1: |
| 118 | return 0; |
| 119 | case 2: |
| 120 | return 0; |
| 121 | case 3: |
| 122 | return 1; |
| 123 | default: |
| 124 | break; |
| 125 | }; |
| 126 | |
| 127 | return -1; |
| 128 | } |
| 129 | |
| 130 | /* Initialize I/O specific objects */ |
| 131 | bool RadioInterfaceMulti::init(int type) |
| 132 | { |
| 133 | float cutoff = 1.0f; |
| 134 | size_t inchunk = 0, outchunk = 0; |
| 135 | |
| 136 | if (mChans > MCHANS - 1) { |
| 137 | LOG(ALERT) << "Invalid channel configuration " << mChans; |
| 138 | return false; |
| 139 | } |
| 140 | |
| 141 | close(); |
| 142 | |
| 143 | sendBuffer.resize(mChans); |
| 144 | recvBuffer.resize(mChans); |
| 145 | convertSendBuffer.resize(1); |
| 146 | convertRecvBuffer.resize(1); |
| 147 | |
| 148 | mReceiveFIFO.resize(mChans); |
| 149 | powerScaling.resize(mChans); |
| 150 | history.resize(mChans); |
| 151 | active.resize(MCHANS, false); |
| 152 | |
| 153 | inchunk = RESAMP_INRATE * 4; |
| 154 | outchunk = RESAMP_OUTRATE * 4; |
| 155 | |
| 156 | if (inchunk * NUMCHUNKS < 625 * 2) { |
| 157 | LOG(ALERT) << "Invalid inner chunk size " << inchunk; |
| 158 | return false; |
| 159 | } |
| 160 | |
| 161 | dnsampler = new Resampler(RESAMP_INRATE, RESAMP_OUTRATE); |
| 162 | if (!dnsampler->init(1.0)) { |
| 163 | LOG(ALERT) << "Rx resampler failed to initialize"; |
| 164 | return false; |
| 165 | } |
| 166 | |
| 167 | upsampler = new Resampler(RESAMP_OUTRATE, RESAMP_INRATE); |
| 168 | if (!upsampler->init(cutoff)) { |
| 169 | LOG(ALERT) << "Tx resampler failed to initialize"; |
| 170 | return false; |
| 171 | } |
| 172 | |
| 173 | channelizer = new Channelizer(MCHANS, outchunk); |
| 174 | if (!channelizer->init()) { |
| 175 | LOG(ALERT) << "Rx channelizer failed to initialize"; |
| 176 | return false; |
| 177 | } |
| 178 | |
| 179 | synthesis = new Synthesis(MCHANS, outchunk); |
| 180 | if (!synthesis->init()) { |
| 181 | LOG(ALERT) << "Tx synthesis filter failed to initialize"; |
| 182 | return false; |
| 183 | } |
| 184 | |
| 185 | /* |
| 186 | * Allocate high and low rate buffers. The high rate receive |
| 187 | * buffer and low rate transmit vectors feed into the resampler |
| 188 | * and requires headroom equivalent to the filter length. Low |
| 189 | * rate buffers are allocated in the main radio interface code. |
| 190 | */ |
| 191 | for (size_t i = 0; i < mChans; i++) { |
| 192 | sendBuffer[i] = new RadioBuffer(NUMCHUNKS, inchunk, |
| 193 | upsampler->len(), true); |
| 194 | recvBuffer[i] = new RadioBuffer(NUMCHUNKS, inchunk, |
| 195 | 0, false); |
| 196 | history[i] = new signalVector(dnsampler->len()); |
| 197 | |
| 198 | synthesis->resetBuffer(i); |
| 199 | } |
| 200 | |
| 201 | outerSendBuffer = new signalVector(synthesis->outputLen()); |
| 202 | outerRecvBuffer = new signalVector(channelizer->inputLen()); |
| 203 | |
| 204 | convertSendBuffer[0] = new short[2 * synthesis->outputLen()]; |
| 205 | convertRecvBuffer[0] = new short[2 * channelizer->inputLen()]; |
| 206 | |
| 207 | /* Configure channels */ |
| 208 | switch (mChans) { |
| 209 | case 1: |
| 210 | active[0] = true; |
| 211 | break; |
| 212 | case 2: |
| 213 | active[0] = true; |
| 214 | active[3] = true; |
| 215 | break; |
| 216 | case 3: |
| 217 | active[0] = true; |
| 218 | active[1] = true; |
| 219 | active[3] = true; |
| 220 | break; |
| 221 | default: |
| 222 | LOG(ALERT) << "Unsupported channel combination"; |
| 223 | return false; |
| 224 | } |
| 225 | |
| 226 | return true; |
| 227 | } |
| 228 | |
| 229 | /* Receive a timestamped chunk from the device */ |
Pau Espin Pedrol | 8e498bf | 2018-09-03 16:45:15 +0200 | [diff] [blame] | 230 | int RadioInterfaceMulti::pullBuffer() |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 231 | { |
| 232 | bool local_underrun; |
| 233 | size_t num; |
| 234 | float *buf; |
Pau Espin Pedrol | 1f15152 | 2018-08-30 20:52:22 +0200 | [diff] [blame] | 235 | unsigned int i; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 236 | |
| 237 | if (recvBuffer[0]->getFreeSegments() <= 0) |
Pau Espin Pedrol | 8e498bf | 2018-09-03 16:45:15 +0200 | [diff] [blame] | 238 | return -1; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 239 | |
| 240 | /* Outer buffer access size is fixed */ |
Pau Espin Pedrol | a801ae5 | 2019-09-13 15:59:29 +0200 | [diff] [blame] | 241 | num = mDevice->readSamples(convertRecvBuffer, |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 242 | outerRecvBuffer->size(), |
| 243 | &overrun, |
| 244 | readTimestamp, |
| 245 | &local_underrun); |
| 246 | if (num != channelizer->inputLen()) { |
| 247 | LOG(ALERT) << "Receive error " << num << ", " << channelizer->inputLen(); |
Pau Espin Pedrol | 8e498bf | 2018-09-03 16:45:15 +0200 | [diff] [blame] | 248 | return -1; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 249 | } |
| 250 | |
| 251 | convert_short_float((float *) outerRecvBuffer->begin(), |
| 252 | convertRecvBuffer[0], 2 * outerRecvBuffer->size()); |
| 253 | |
Pau Espin Pedrol | e503c98 | 2019-09-13 18:56:08 +0200 | [diff] [blame^] | 254 | osmo_trx_sync_or_and_fetch(&underrun, local_underrun); |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 255 | readTimestamp += num; |
| 256 | |
| 257 | channelizer->rotate((float *) outerRecvBuffer->begin(), |
| 258 | outerRecvBuffer->size()); |
| 259 | |
| 260 | for (size_t pchan = 0; pchan < MCHANS; pchan++) { |
| 261 | if (!active[pchan]) |
| 262 | continue; |
| 263 | |
| 264 | int lchan = getLogicalChan(pchan, mChans); |
| 265 | if (lchan < 0) { |
| 266 | LOG(ALERT) << "Invalid logical channel " << pchan; |
| 267 | continue; |
| 268 | } |
| 269 | |
| 270 | /* |
| 271 | * Update history by writing into the head portion of the |
| 272 | * channelizer output buffer. For this to work, filter length of |
| 273 | * the polyphase channelizer partition filter should be equal to |
| 274 | * or larger than the resampling filter. |
| 275 | */ |
| 276 | buf = channelizer->outputBuffer(pchan); |
| 277 | size_t cLen = channelizer->outputLen(); |
| 278 | size_t hLen = dnsampler->len(); |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 279 | |
Pau Espin Pedrol | 1f15152 | 2018-08-30 20:52:22 +0200 | [diff] [blame] | 280 | float *fdst = &buf[2 * -hLen]; |
| 281 | complex *src = history[lchan]->begin(); |
| 282 | for (i = 0; i < hLen; i++) { |
| 283 | fdst[0] = src->real(); |
| 284 | fdst[1] = src->imag(); |
| 285 | src++; |
| 286 | fdst += 2; |
| 287 | } |
| 288 | complex *dst = history[lchan]->begin(); |
| 289 | float *fsrc = &buf[2 * (cLen - hLen)]; |
| 290 | for (i = 0; i < hLen; i++) { |
Timo Jacobus | 18a6151 | 2019-09-05 12:12:16 +0200 | [diff] [blame] | 291 | *dst = complex(fsrc[0], fsrc[1]); |
Pau Espin Pedrol | 1f15152 | 2018-08-30 20:52:22 +0200 | [diff] [blame] | 292 | fsrc += 2; |
| 293 | dst++; |
| 294 | } |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 295 | |
| 296 | float *wr_segment = recvBuffer[lchan]->getWriteSegment(); |
| 297 | |
| 298 | /* Write to the end of the inner receive buffer */ |
| 299 | if (!dnsampler->rotate(channelizer->outputBuffer(pchan), |
| 300 | channelizer->outputLen(), |
| 301 | wr_segment, |
| 302 | recvBuffer[lchan]->getSegmentLen())) { |
| 303 | LOG(ALERT) << "Sample rate upsampling error"; |
| 304 | } |
| 305 | } |
Pau Espin Pedrol | 8e498bf | 2018-09-03 16:45:15 +0200 | [diff] [blame] | 306 | return 0; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 307 | } |
| 308 | |
| 309 | /* Send a timestamped chunk to the device */ |
| 310 | bool RadioInterfaceMulti::pushBuffer() |
| 311 | { |
Pau Espin Pedrol | 25383a3 | 2019-09-13 18:23:47 +0200 | [diff] [blame] | 312 | bool local_underrun; |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 313 | if (sendBuffer[0]->getAvailSegments() <= 0) |
| 314 | return false; |
| 315 | |
| 316 | for (size_t pchan = 0; pchan < MCHANS; pchan++) { |
| 317 | if (!active[pchan]) { |
| 318 | synthesis->resetBuffer(pchan); |
| 319 | continue; |
| 320 | } |
| 321 | |
| 322 | int lchan = getLogicalChan(pchan, mChans); |
| 323 | if (lchan < 0) { |
| 324 | LOG(ALERT) << "Invalid logical channel " << pchan; |
| 325 | continue; |
| 326 | } |
| 327 | |
| 328 | if (!upsampler->rotate(sendBuffer[lchan]->getReadSegment(), |
| 329 | sendBuffer[lchan]->getSegmentLen(), |
| 330 | synthesis->inputBuffer(pchan), |
| 331 | synthesis->inputLen())) { |
| 332 | LOG(ALERT) << "Sample rate downsampling error"; |
| 333 | } |
| 334 | } |
| 335 | |
| 336 | synthesis->rotate((float *) outerSendBuffer->begin(), |
| 337 | outerSendBuffer->size()); |
| 338 | |
| 339 | convert_float_short(convertSendBuffer[0], |
| 340 | (float *) outerSendBuffer->begin(), |
| 341 | 1.0 / (float) mChans, 2 * outerSendBuffer->size()); |
| 342 | |
Pau Espin Pedrol | a801ae5 | 2019-09-13 15:59:29 +0200 | [diff] [blame] | 343 | size_t num = mDevice->writeSamples(convertSendBuffer, |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 344 | outerSendBuffer->size(), |
Pau Espin Pedrol | 25383a3 | 2019-09-13 18:23:47 +0200 | [diff] [blame] | 345 | &local_underrun, |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 346 | writeTimestamp); |
| 347 | if (num != outerSendBuffer->size()) { |
| 348 | LOG(ALERT) << "Transmit error " << num; |
| 349 | } |
| 350 | |
Pau Espin Pedrol | e503c98 | 2019-09-13 18:56:08 +0200 | [diff] [blame^] | 351 | osmo_trx_sync_or_and_fetch(&underrun, local_underrun); |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 352 | writeTimestamp += num; |
| 353 | |
| 354 | return true; |
| 355 | } |
| 356 | |
| 357 | /* Frequency comparison limit */ |
| 358 | #define FREQ_DELTA_LIMIT 10.0 |
| 359 | |
| 360 | static bool fltcmp(double a, double b) |
| 361 | { |
| 362 | return fabs(a - b) < FREQ_DELTA_LIMIT ? true : false; |
| 363 | } |
| 364 | |
| 365 | bool RadioInterfaceMulti::tuneTx(double freq, size_t chan) |
| 366 | { |
| 367 | if (chan >= mChans) |
| 368 | return false; |
| 369 | |
| 370 | double shift = (double) getFreqShift(mChans); |
| 371 | |
| 372 | if (!chan) |
Pau Espin Pedrol | a801ae5 | 2019-09-13 15:59:29 +0200 | [diff] [blame] | 373 | return mDevice->setTxFreq(freq + shift * MCBTS_SPACING); |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 374 | |
Pau Espin Pedrol | a801ae5 | 2019-09-13 15:59:29 +0200 | [diff] [blame] | 375 | double center = mDevice->getTxFreq(); |
Tom Tsou | c37594f | 2016-07-08 14:39:42 -0700 | [diff] [blame] | 376 | if (!fltcmp(freq, center + (double) (chan - shift) * MCBTS_SPACING)) { |
| 377 | LOG(NOTICE) << "Channel " << chan << " RF frequency offset is " |
| 378 | << freq / 1e6 << " MHz"; |
| 379 | } |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 380 | |
| 381 | return true; |
| 382 | } |
| 383 | |
| 384 | bool RadioInterfaceMulti::tuneRx(double freq, size_t chan) |
| 385 | { |
| 386 | if (chan >= mChans) |
| 387 | return false; |
| 388 | |
| 389 | double shift = (double) getFreqShift(mChans); |
| 390 | |
| 391 | if (!chan) |
Pau Espin Pedrol | a801ae5 | 2019-09-13 15:59:29 +0200 | [diff] [blame] | 392 | return mDevice->setRxFreq(freq + shift * MCBTS_SPACING); |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 393 | |
Pau Espin Pedrol | a801ae5 | 2019-09-13 15:59:29 +0200 | [diff] [blame] | 394 | double center = mDevice->getRxFreq(); |
Tom Tsou | c37594f | 2016-07-08 14:39:42 -0700 | [diff] [blame] | 395 | if (!fltcmp(freq, center + (double) (chan - shift) * MCBTS_SPACING)) { |
| 396 | LOG(NOTICE) << "Channel " << chan << " RF frequency offset is " |
| 397 | << freq / 1e6 << " MHz"; |
| 398 | } |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 399 | |
| 400 | return true; |
| 401 | } |
| 402 | |
| 403 | double RadioInterfaceMulti::setRxGain(double db, size_t chan) |
| 404 | { |
Pau Espin Pedrol | 17e6cd0 | 2019-09-13 16:19:58 +0200 | [diff] [blame] | 405 | if (chan == 0) |
Pau Espin Pedrol | a801ae5 | 2019-09-13 15:59:29 +0200 | [diff] [blame] | 406 | return mDevice->setRxGain(db); |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 407 | else |
Pau Espin Pedrol | a801ae5 | 2019-09-13 15:59:29 +0200 | [diff] [blame] | 408 | return mDevice->getRxGain(); |
Tom Tsou | 7676427 | 2016-06-24 14:25:39 -0700 | [diff] [blame] | 409 | } |
Pau Espin Pedrol | 6284524 | 2019-09-13 17:29:21 +0200 | [diff] [blame] | 410 | |
| 411 | double RadioInterfaceMulti::setTxGain(double dB, size_t chan) |
| 412 | { |
| 413 | if (chan == 0) |
| 414 | return mDevice->setTxGain(dB); |
| 415 | else |
| 416 | return mDevice->getTxGain(); |
| 417 | |
| 418 | } |