| 1 | #!/usr/bin/env python |
|---|
| 2 | #Transmission and reception, one ata a time on the same antena |
|---|
| 3 | |
|---|
| 4 | from gnuradio import gr, gru, modulation_utils |
|---|
| 5 | from gnuradio import eng_notation |
|---|
| 6 | from gnuradio.eng_option import eng_option |
|---|
| 7 | from optparse import OptionParser |
|---|
| 8 | from numpy import random |
|---|
| 9 | import random, time, struct, sys, math |
|---|
| 10 | from datetime import datetime |
|---|
| 11 | |
|---|
| 12 | # from current dir |
|---|
| 13 | from transmit_path import transmit_path |
|---|
| 14 | from receive_path import receive_path |
|---|
| 15 | |
|---|
| 16 | # import cross |
|---|
| 17 | from cross import * |
|---|
| 18 | |
|---|
| 19 | |
|---|
| 20 | global sync_status,mode,ch,traffic_flag,n_rcvd, n_right |
|---|
| 21 | sync_status = False |
|---|
| 22 | #Defining modes of operation |
|---|
| 23 | # sync: the two nodes are trying to rendezvous on a common channel |
|---|
| 24 | # traffic: the two node are communicating information to each other |
|---|
| 25 | mode = "sync" #Default mode is sync |
|---|
| 26 | traffic_flag = False |
|---|
| 27 | class my_top_block(gr.top_block): |
|---|
| 28 | |
|---|
| 29 | def __init__(self, mod_class, demod_class, |
|---|
| 30 | rx_callback, options_tx,options_rx): |
|---|
| 31 | |
|---|
| 32 | gr.top_block.__init__(self) |
|---|
| 33 | self.rxpath = receive_path(demod_class, rx_callback, options_rx) |
|---|
| 34 | self.txpath = transmit_path(mod_class, options_tx) |
|---|
| 35 | self.connect(self.txpath); |
|---|
| 36 | self.connect(self.rxpath); |
|---|
| 37 | |
|---|
| 38 | |
|---|
| 39 | def main(): |
|---|
| 40 | |
|---|
| 41 | global stats_array, count_array, time_array, n_rcvd, n_right,sync_status,mode,ch,traffic_flag,n_attempts,return_flag |
|---|
| 42 | n_rcvd = 0 |
|---|
| 43 | n_right = 0 |
|---|
| 44 | n_attempts = 5 |
|---|
| 45 | return_flag = 0 |
|---|
| 46 | |
|---|
| 47 | count_array = [ 0, 0, 0, 0, 0] |
|---|
| 48 | time_array = [ 0, 0, 0, 0, 0] |
|---|
| 49 | stats_array = [ 0, 0, 0, 0, 0] |
|---|
| 50 | |
|---|
| 51 | |
|---|
| 52 | def send_pkt(self, payload='', eof=False): |
|---|
| 53 | return self.txpath.send_pkt(payload, eof) |
|---|
| 54 | |
|---|
| 55 | def get_real_channel(channel): |
|---|
| 56 | |
|---|
| 57 | real_channel = 1; |
|---|
| 58 | |
|---|
| 59 | if channel == 1: |
|---|
| 60 | real_channel = 1 |
|---|
| 61 | if channel == 2: |
|---|
| 62 | real_channel = 7 |
|---|
| 63 | if channel == 3: |
|---|
| 64 | real_channel = 8 |
|---|
| 65 | if channel == 4: |
|---|
| 66 | real_channel = 14 |
|---|
| 67 | |
|---|
| 68 | return real_channel |
|---|
| 69 | |
|---|
| 70 | def get_average_time(channel,absent_time): |
|---|
| 71 | |
|---|
| 72 | global count_array, time_array |
|---|
| 73 | |
|---|
| 74 | count_array[channel] = count_array[channel] + 1 |
|---|
| 75 | average_time = (time_array[channel] + absent_time) / count_array[channel] |
|---|
| 76 | |
|---|
| 77 | return average_time |
|---|
| 78 | |
|---|
| 79 | def get_freq(hop_freq,probe_level,absent_time,cross): |
|---|
| 80 | |
|---|
| 81 | # Convert hop_freq to our unique channel list |
|---|
| 82 | |
|---|
| 83 | if cross == True: |
|---|
| 84 | |
|---|
| 85 | if hop_freq == 462562500: |
|---|
| 86 | channel = 1 |
|---|
| 87 | if hop_freq == 462712500: |
|---|
| 88 | channel = 2 |
|---|
| 89 | if hop_freq == 467562500: |
|---|
| 90 | channel = 3 |
|---|
| 91 | if hop_freq == 467712500: |
|---|
| 92 | channel = 4 |
|---|
| 93 | |
|---|
| 94 | currentParameters = Parameter(1) |
|---|
| 95 | currentParameters[0].name = "channel" |
|---|
| 96 | currentParameters[0].value = channel |
|---|
| 97 | |
|---|
| 98 | o = Observable(2) |
|---|
| 99 | o[0].value = probe_level |
|---|
| 100 | o[0].name = "energy" |
|---|
| 101 | |
|---|
| 102 | o[1].value = absent_time |
|---|
| 103 | o[1].name = "communication_time" |
|---|
| 104 | |
|---|
| 105 | # If time == 0 then we are scanning and we dont want to |
|---|
| 106 | # use this time in the averaging process. |
|---|
| 107 | |
|---|
| 108 | if absent_time != 0: |
|---|
| 109 | UpdateParameterPerformance(currentParameters,1,o,1) |
|---|
| 110 | |
|---|
| 111 | else: |
|---|
| 112 | # Get the average communication time |
|---|
| 113 | average_time = get_average_time(channel, absent_time) |
|---|
| 114 | o[1].value = average_time |
|---|
| 115 | o[1].name = "communication_time" |
|---|
| 116 | UpdateParameterPerformance(currentParameters,1,o,2) |
|---|
| 117 | |
|---|
| 118 | p = Parameter(1) |
|---|
| 119 | p = GetOptimalParameters(o,2,currentParameters,1); |
|---|
| 120 | |
|---|
| 121 | channel = get_real_channel(int(p[0].value)) |
|---|
| 122 | else: |
|---|
| 123 | channel = int(random.choice([1,7,8,14])) |
|---|
| 124 | |
|---|
| 125 | |
|---|
| 126 | if channel < 8: |
|---|
| 127 | hop_freq = float(1e6 * (462.5625+(channel-1)*0.025))#setting the centre freq frequency for sending packets |
|---|
| 128 | else: |
|---|
| 129 | hop_freq = float(1e6 * (467.5625+(channel-8)*0.025))#setting the centre freq frequency for sending packets |
|---|
| 130 | |
|---|
| 131 | return channel,hop_freq #returning the channel number and hop frequency |
|---|
| 132 | |
|---|
| 133 | |
|---|
| 134 | def rx_callback(ok, payload): |
|---|
| 135 | |
|---|
| 136 | global n_rcvd, n_right,sync_status,mode,ch,traffic_flag |
|---|
| 137 | ########################## sync #################################### |
|---|
| 138 | if mode == "sync": |
|---|
| 139 | if ok: |
|---|
| 140 | (pktno,) = struct.unpack('!H', payload[0:2]) |
|---|
| 141 | (sync_signal,) = struct.unpack('!s', payload[2]) |
|---|
| 142 | (data_channel,) = struct.unpack('!H', payload[3:5]) |
|---|
| 143 | |
|---|
| 144 | if str(sync_signal) == 'o' and str(data_channel) == str(ch): |
|---|
| 145 | |
|---|
| 146 | sync_status = True |
|---|
| 147 | #tb.stop() |
|---|
| 148 | |
|---|
| 149 | if str(sync_signal) == 's' and str(data_channel) == str(ch): |
|---|
| 150 | |
|---|
| 151 | sync_status = True |
|---|
| 152 | data = 'o' |
|---|
| 153 | pktno=0 |
|---|
| 154 | ack_payload = struct.pack('!HsH', pktno & 0xffff,data,ch & 0xffff) #+ data |
|---|
| 155 | send_pkt(tb,ack_payload) #sending back the acknowledgement |
|---|
| 156 | ################################################################### |
|---|
| 157 | |
|---|
| 158 | ######################### traffic ################################# |
|---|
| 159 | if mode == "traffic": |
|---|
| 160 | if ok: |
|---|
| 161 | (data_header,) = struct.unpack('!s', payload[0]) |
|---|
| 162 | if data_header == 'd': |
|---|
| 163 | traffic_flag = True |
|---|
| 164 | comm = struct.unpack('!14s', payload[1:15]) |
|---|
| 165 | data = 'dI am fine.....' #Sending this message |
|---|
| 166 | payload = struct.pack('!15s', data) |
|---|
| 167 | send_pkt(tb,payload) |
|---|
| 168 | |
|---|
| 169 | ############################################################## |
|---|
| 170 | |
|---|
| 171 | n_rcvd += 1 |
|---|
| 172 | if ok: |
|---|
| 173 | n_right += 1 |
|---|
| 174 | |
|---|
| 175 | mods = modulation_utils.type_1_mods() |
|---|
| 176 | demods = modulation_utils.type_1_demods() |
|---|
| 177 | |
|---|
| 178 | #setting up the tx options parser |
|---|
| 179 | |
|---|
| 180 | parser_tx = OptionParser(option_class=eng_option, conflict_handler="resolve") |
|---|
| 181 | |
|---|
| 182 | parser_tx.add_option("-m", "--modulation", type="choice", choices=mods.keys(), |
|---|
| 183 | default='gmsk', |
|---|
| 184 | help="Select modulation from: %s [default=%%default]" |
|---|
| 185 | % (', '.join(mods.keys()),)) |
|---|
| 186 | parser_tx.add_option("-s", "--size", type="eng_float", default=1500, |
|---|
| 187 | help="set packet size [default=%default]") |
|---|
| 188 | parser_tx.add_option("-M", "--megabytes", type="eng_float", default=1.0, |
|---|
| 189 | help="set megabytes to transmit [default=%default]") |
|---|
| 190 | parser_tx.add_option("","--discontinuous", action="store_true", default=False, |
|---|
| 191 | help="enable discontinous transmission (bursts of 5 packets)") |
|---|
| 192 | parser_tx.add_option("","--from-file", default=None, |
|---|
| 193 | help="use file for packet contents") |
|---|
| 194 | |
|---|
| 195 | expert_grp_tx = parser_tx.add_option_group("Expert_tx") |
|---|
| 196 | dsa_grp = parser_tx.add_option_group("DSA Options") |
|---|
| 197 | dsa_grp.add_option("-c", "--cross", action="store_true", default=False, |
|---|
| 198 | help="Use the CROSS CBR Cognitive Engine for DSA channel decisions [default=off (random selection)].") |
|---|
| 199 | |
|---|
| 200 | dsa_grp.add_option("-T", "--threshold", type="eng_float", default=1.5e8, |
|---|
| 201 | help="set primary user sensing energy threshold [default=%default]") |
|---|
| 202 | |
|---|
| 203 | |
|---|
| 204 | transmit_path.add_options(parser_tx, expert_grp_tx) |
|---|
| 205 | parser_tx.remove_option('-f'); |
|---|
| 206 | parser_tx.remove_option('--tx-freq'); |
|---|
| 207 | |
|---|
| 208 | for mod in mods.values(): |
|---|
| 209 | mod.add_options(expert_grp_tx) |
|---|
| 210 | |
|---|
| 211 | |
|---|
| 212 | (options_tx, args_tx) = parser_tx.parse_args () |
|---|
| 213 | |
|---|
| 214 | if len(args_tx) != 0: |
|---|
| 215 | parser_tx.print_help() |
|---|
| 216 | sys.exit(1) |
|---|
| 217 | |
|---|
| 218 | ############# Setting some default values for tx side of the block |
|---|
| 219 | options_tx.tx_freq = 462.5625e6 |
|---|
| 220 | options_tx.samples_per_symbol = 2 |
|---|
| 221 | options_tx.modulation = 'dbpsk' |
|---|
| 222 | options_tx.fusb_block_size = 4096 |
|---|
| 223 | options_tx.fusb_nblocks = 16 |
|---|
| 224 | options_tx.bitrate = 0.0125e6 |
|---|
| 225 | ############# |
|---|
| 226 | |
|---|
| 227 | if options_tx.tx_freq is None: |
|---|
| 228 | sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") |
|---|
| 229 | parser_tx.print_help(sys.stderr) |
|---|
| 230 | sys.exit(1) |
|---|
| 231 | |
|---|
| 232 | parser_rx = OptionParser (option_class=eng_option, conflict_handler="resolve") |
|---|
| 233 | expert_grp_rx = parser_rx.add_option_group("Expert_rx") |
|---|
| 234 | receive_path.add_options(parser_rx, expert_grp_rx) |
|---|
| 235 | |
|---|
| 236 | parser_rx.remove_option('-f'); |
|---|
| 237 | |
|---|
| 238 | parser_rx.add_option("-c", "--cross", action="store_true", default=False, |
|---|
| 239 | help="Use the CROSS engine for DSA decisions: default is random.") |
|---|
| 240 | parser_rx.add_option("-T", "--threshold", type="eng_float", default=1.5e8, |
|---|
| 241 | help="set primary user sensing energy threshold [default=%default]") |
|---|
| 242 | |
|---|
| 243 | |
|---|
| 244 | |
|---|
| 245 | (options_rx, args_rx) = parser_rx.parse_args () |
|---|
| 246 | |
|---|
| 247 | ############# Setting some default values for rx side of the block |
|---|
| 248 | options_rx.rx_freq = 462.5625e6 #setting default rx_freq value |
|---|
| 249 | options_rx.samples_per_symbol = 2 |
|---|
| 250 | options_rx.modulation = 'dbpsk' |
|---|
| 251 | options_rx.fusb_block_size = 4096 |
|---|
| 252 | options_rx.fusb_nblocks = 16 |
|---|
| 253 | options_rx.bitrate = 0.0125e6 |
|---|
| 254 | ############# |
|---|
| 255 | |
|---|
| 256 | |
|---|
| 257 | |
|---|
| 258 | if options_rx.cross == True: |
|---|
| 259 | print "[[ Using the CROSS DSA Cognitive Engine ]]\n" |
|---|
| 260 | else: |
|---|
| 261 | print "[[ Using the RANDOM channel selection algorithm ]]\n" |
|---|
| 262 | |
|---|
| 263 | # build the graph |
|---|
| 264 | |
|---|
| 265 | tb = my_top_block(mods[options_tx.modulation], |
|---|
| 266 | demods[options_rx.modulation], |
|---|
| 267 | rx_callback,options_tx, |
|---|
| 268 | options_rx) |
|---|
| 269 | r = gr.enable_realtime_scheduling() |
|---|
| 270 | if r != gr.RT_OK: |
|---|
| 271 | print "Warning: failed to enable realtime scheduling" |
|---|
| 272 | |
|---|
| 273 | tb.start() |
|---|
| 274 | |
|---|
| 275 | #listening to random frequencies untill a match is found |
|---|
| 276 | running = True |
|---|
| 277 | ch_energy = tb.rxpath.probe.level() #setting initial value |
|---|
| 278 | hop_freq = options_tx.tx_freq # = options_rx.rx_freq...same for tx and rx side |
|---|
| 279 | |
|---|
| 280 | |
|---|
| 281 | # Scan all channels first for inital data |
|---|
| 282 | time.sleep(0.1) |
|---|
| 283 | |
|---|
| 284 | print "\n[[ Scanning channels for network nodes ]]\n" |
|---|
| 285 | while running: |
|---|
| 286 | |
|---|
| 287 | ################################################sync mode#################################### |
|---|
| 288 | if mode == "sync": |
|---|
| 289 | if sync_status != True: |
|---|
| 290 | |
|---|
| 291 | if return_flag == 0: |
|---|
| 292 | ch,hop_freq = get_freq(hop_freq,ch_energy,0,options_rx.cross) |
|---|
| 293 | else: |
|---|
| 294 | ch,hop_freq = get_freq(hop_freq,ch_energy,elapsed_time,options_rx.cross) |
|---|
| 295 | return_flag = 0 |
|---|
| 296 | |
|---|
| 297 | tb.txpath.set_freq(hop_freq) |
|---|
| 298 | tb.rxpath.set_freq(hop_freq) |
|---|
| 299 | |
|---|
| 300 | ch_energy = tb.rxpath.probe.level() #check if primary user is present |
|---|
| 301 | |
|---|
| 302 | if int(ch_energy) > 1.5e8: #if primary user is there then dont transmit on this channel |
|---|
| 303 | continue |
|---|
| 304 | |
|---|
| 305 | nbytes = 5 #int(1e6 * .0003) |
|---|
| 306 | pkt_size = 5 |
|---|
| 307 | n = 0 |
|---|
| 308 | pktno = 0 |
|---|
| 309 | while n < nbytes: |
|---|
| 310 | if options_tx.from_file is None: |
|---|
| 311 | data = 's' |
|---|
| 312 | else: |
|---|
| 313 | data = source_file.read(pkt_size - 2) |
|---|
| 314 | if data == '': |
|---|
| 315 | break; |
|---|
| 316 | |
|---|
| 317 | payload = struct.pack('!HsH', pktno & 0xffff,data,ch & 0xffff) #+ data |
|---|
| 318 | |
|---|
| 319 | send_pkt(tb,payload) |
|---|
| 320 | n += len(payload) |
|---|
| 321 | sys.stderr.write('.') |
|---|
| 322 | if options_tx.discontinuous and pktno % 5 == 4: |
|---|
| 323 | time.sleep(1) |
|---|
| 324 | pktno += 1 |
|---|
| 325 | time.sleep(0.1) |
|---|
| 326 | |
|---|
| 327 | else: |
|---|
| 328 | print "\n\n[[ Network Node Found: Commencing communications on CHANNEL ", ch, " ]]\n"; |
|---|
| 329 | n_attempts_counter = 0 |
|---|
| 330 | mode = "traffic" |
|---|
| 331 | traffic_flag = False |
|---|
| 332 | sync_status="False" |
|---|
| 333 | start_time = datetime.now() #measuring the time for which the primary user is away |
|---|
| 334 | |
|---|
| 335 | ################################################end of sync mode#################################### |
|---|
| 336 | |
|---|
| 337 | ################################################Communications mode################################# |
|---|
| 338 | if mode == "traffic": |
|---|
| 339 | |
|---|
| 340 | nbytes = 15 |
|---|
| 341 | pkt_size = 15 |
|---|
| 342 | data_pktno = 0 |
|---|
| 343 | n = 0 |
|---|
| 344 | while n < nbytes: |
|---|
| 345 | |
|---|
| 346 | if options_tx.from_file is None: |
|---|
| 347 | data = 'dHi how are you' #Sending this message |
|---|
| 348 | |
|---|
| 349 | else: |
|---|
| 350 | data = source_file.read(pkt_size - 2) |
|---|
| 351 | if data == '': |
|---|
| 352 | break; |
|---|
| 353 | |
|---|
| 354 | |
|---|
| 355 | payload = struct.pack('!15s', data) |
|---|
| 356 | |
|---|
| 357 | send_pkt(tb,payload) |
|---|
| 358 | n += len(payload) |
|---|
| 359 | sys.stderr.write('.') |
|---|
| 360 | if options_tx.discontinuous and data_pktno % 5 == 4: |
|---|
| 361 | time.sleep(1) |
|---|
| 362 | data_pktno += 1 |
|---|
| 363 | time.sleep(0.2 + 0.05*int(random.choice([0,1,2,3]))) |
|---|
| 364 | |
|---|
| 365 | if traffic_flag != True: |
|---|
| 366 | n_attempts_counter += 1 |
|---|
| 367 | if n_attempts_counter > n_attempts: #get out of the data channel as it seems that the other node is still trying to rendezvous |
|---|
| 368 | mode = "sync" |
|---|
| 369 | continue |
|---|
| 370 | |
|---|
| 371 | ch_energy = tb.rxpath.probe.level() #check if primary user is present |
|---|
| 372 | |
|---|
| 373 | if int(ch_energy) > 1.5e8: #if primary user is there then dont transmit on this channel |
|---|
| 374 | stop_time = datetime.now() |
|---|
| 375 | _elapsed_time = start_time - stop_time |
|---|
| 376 | elapsed_time = _elapsed_time.seconds |
|---|
| 377 | print "\n[[ Primary User Detected: Evacuating Current Channel ]]\n" |
|---|
| 378 | print "\n[[ Scanning channels for network nodes ]]\n" |
|---|
| 379 | mode = "sync" |
|---|
| 380 | return_flag = 1 |
|---|
| 381 | |
|---|
| 382 | |
|---|
| 383 | if __name__ == '__main__': |
|---|
| 384 | try: |
|---|
| 385 | main() |
|---|
| 386 | except KeyboardInterrupt: |
|---|
| 387 | pass |
|---|
| 388 | |
|---|
| 389 | |
|---|
| 390 | |
|---|
| 391 | |
|---|
| 392 | |
|---|
