| 1 | #!/usr/bin/env python |
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| 2 | #Transmission and reception, one ata a time on the same antena |
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| 3 | |
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| 4 | from gnuradio import gr, gru, modulation_utils |
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| 5 | from gnuradio import eng_notation |
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| 6 | ##########spectrum sense specific imports |
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| 7 | from gnuradio import optfir, window |
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| 8 | from gnuradio import usrp |
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| 9 | #from gnuradio.eng_option import eng_option |
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| 10 | #from usrpm import usrp_dbid |
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| 11 | ########## |
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| 12 | from gnuradio.eng_option import eng_option |
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| 13 | from optparse import OptionParser |
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| 14 | from numpy import random |
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| 15 | import random, time, struct, sys, math |
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| 16 | |
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| 17 | # from current dir |
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| 18 | from transmit_path import transmit_path |
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| 19 | from receive_path import receive_path |
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| 20 | #import spec_sense_path |
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| 21 | |
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| 22 | global sync_status |
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| 23 | sync_status = False #default value is "False"... |
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| 24 | global mode |
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| 25 | #Defining modes of operation |
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| 26 | #sync = synchronizing with other node before data transfer |
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| 27 | #traffic = data transfer |
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| 28 | #spec_sense = sensing spectrum for primary user |
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| 29 | mode = "sync" #default mode of operation... |
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| 30 | class my_top_block(gr.top_block): |
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| 31 | |
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| 32 | def __init__(self, mod_class, demod_class, |
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| 33 | rx_callback, options_tx,options_rx): |
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| 34 | |
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| 35 | gr.top_block.__init__(self) |
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| 36 | self.rxpath = receive_path(demod_class, rx_callback, options_rx) |
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| 37 | self.txpath = transmit_path(mod_class, options_tx) |
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| 38 | self.connect(self.txpath); |
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| 39 | self.connect(self.rxpath); |
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| 40 | |
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| 41 | |
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| 42 | #//////main////// |
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| 43 | |
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| 44 | global n_rcvd, n_right,hop_freq |
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| 45 | |
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| 46 | def main(): |
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| 47 | global n_rcvd, n_right,sync_status,mode,hop_freq |
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| 48 | n_rcvd = 0 |
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| 49 | n_right = 0 |
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| 50 | def send_pkt(self, payload='', eof=False): |
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| 51 | return self.txpath.send_pkt(payload, eof) |
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| 52 | |
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| 53 | def rx_callback(ok, payload): |
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| 54 | |
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| 55 | |
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| 56 | print "inside rx callback" |
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| 57 | global n_rcvd, n_right, sync_status,mode,hop_freq |
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| 58 | #tb.rxpath.min_freq = hop_freq - 80e3 |
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| 59 | #tb.rxpath.max_freq = hop_freq + 80e3 |
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| 60 | #tb.rxpath.get_spec_stats(1e13,20,2) |
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| 61 | #temp = struct.unpack('!s', payload[3:10]) |
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| 62 | #print "printing the elements of packet",temp,"!!!!!!!!!!!\n" |
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| 63 | ##################################################### |
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| 64 | if mode == "sync": |
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| 65 | if ok: |
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| 66 | (pktno,) = struct.unpack('!H', payload[0:2]) |
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| 67 | (sync_signal,) = struct.unpack('!s', payload[2]) |
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| 68 | (sync_signal_red,) = struct.unpack('!s', payload[3]) #redundant sync bit |
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| 69 | (data_channel,) = struct.unpack('!s', payload[4]) |
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| 70 | (data_channel_red,) = struct.unpack('!s', payload[5]) #redundant channel bit |
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| 71 | #print "printing the elements of packet ",sync_signal," !!!!!!!!!!! ",sync_signal_red," !!!!!\n" |
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| 72 | #print "printing the channel ",data_channel_red," !!!!!!!!!!! ",data_channel_red," !!!!!\n" |
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| 73 | #== True :# and str(sync_signal) == 'o' and str(sync_signal_red) == 'o': |
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| 74 | if str(data_channel) == str(ch): |
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| 75 | #print "inside if2" |
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| 76 | sync_status = True |
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| 77 | #tb.stop() |
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| 78 | #print "after tb stop ans sync status is ",sync_status," sync status\n" |
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| 79 | #print "received a sync packet on channel %s\n" %(data_channel) |
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| 80 | #data = 'o'+'o'+str(data_channel)+str(data_channel) |
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| 81 | #print "sending this data",data,"@@@@@\n" |
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| 82 | #sync_pktno=0 |
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| 83 | #ack_payload = struct.pack('!H', sync_pktno & 0xffff) + data |
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| 84 | #print "printing the ack packet",ack_payload,"$$$$$\n" |
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| 85 | #k=0 |
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| 86 | #while k < 10000: |
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| 87 | #print "inside while" |
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| 88 | #send_pkt(tb,ack_payload) #sending back the acknowledgement |
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| 89 | #k=k+1 |
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| 90 | ##################################################### |
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| 91 | |
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| 92 | ######################### traffic ############################ |
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| 93 | if mode == "traffic": |
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| 94 | print "Mode is ",mode,"received traffic packet\n" |
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| 95 | if ok: |
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| 96 | (data_header,) = struct.unpack('!s', payload[0]) |
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| 97 | if data_header == 'd': |
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| 98 | (comm,) = struct.unpack('!14s', payload[1:15]) |
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| 99 | print "received this ", comm,"\n" |
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| 100 | else : |
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| 101 | print"not ok" |
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| 102 | |
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| 103 | ############################################################## |
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| 104 | |
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| 105 | |
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| 106 | |
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| 107 | n_rcvd += 1 |
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| 108 | if ok: |
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| 109 | n_right += 1 |
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| 110 | |
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| 111 | #print "ok = %5s pktno = %4d n_rcvd = %4d n_right = %4d" % ( |
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| 112 | #ok, pktno, n_rcvd, n_right) |
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| 113 | |
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| 114 | mods = modulation_utils.type_1_mods() |
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| 115 | demods = modulation_utils.type_1_demods() |
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| 116 | |
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| 117 | #setting up the tx options parser |
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| 118 | parser_tx = OptionParser(option_class=eng_option, conflict_handler="resolve") |
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| 119 | expert_grp_tx = parser_tx.add_option_group("Expert_tx") |
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| 120 | print "printing Expert_tx group",expert_grp_tx,"printing Expert_tx group" |
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| 121 | parser_tx.add_option("-m", "--modulation", type="choice", choices=mods.keys(), |
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| 122 | default='gmsk', |
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| 123 | help="Select modulation from: %s [default=%%default]" |
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| 124 | % (', '.join(mods.keys()),)) |
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| 125 | |
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| 126 | parser_tx.add_option("-s", "--size", type="eng_float", default=1500, |
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| 127 | help="set packet size [default=%default]") |
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| 128 | parser_tx.add_option("-M", "--megabytes", type="eng_float", default=1.0, |
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| 129 | help="set megabytes to transmit [default=%default]") |
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| 130 | parser_tx.add_option("","--discontinuous", action="store_true", default=False, |
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| 131 | help="enable discontinous transmission (bursts of 5 packets)") |
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| 132 | parser_tx.add_option("","--from-file", default=None, |
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| 133 | help="use file for packet contents") |
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| 134 | print "printing parser_tx",parser_tx,"printing parser_tx" |
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| 135 | transmit_path.add_options(parser_tx, expert_grp_tx) |
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| 136 | |
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| 137 | for mod in mods.values(): |
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| 138 | mod.add_options(expert_grp_tx) |
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| 139 | |
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| 140 | (options_tx, args_tx) = parser_tx.parse_args () |
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| 141 | |
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| 142 | if len(args_tx) != 0: |
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| 143 | parser_tx.print_help() |
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| 144 | sys.exit(1) |
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| 145 | ############# Setting some default values for tx side of the block |
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| 146 | options_tx.tx_freq = 462.5625e6 |
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| 147 | options_tx.samples_per_symbol = 2 |
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| 148 | options_tx.modulation = 'dbpsk' |
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| 149 | options_tx.fusb_block_size = 4096 |
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| 150 | options_tx.fusb_nblocks = 16 |
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| 151 | options_tx.bitrate = 0.0125e6 |
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| 152 | ############# |
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| 153 | if options_tx.tx_freq is None: |
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| 154 | sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") |
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| 155 | parser_tx.print_help(sys.stderr) |
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| 156 | sys.exit(1) |
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| 157 | |
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| 158 | if options_tx.from_file is not None: |
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| 159 | source_file = open(options_tx.from_file, 'r') |
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| 160 | print "printing modulation type",mods[options_tx.modulation],"**" |
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| 161 | # build the graph |
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| 162 | print "printing tx options",options_tx,"&&&&\n" |
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| 163 | #tb = my_top_block(mods[options_tx.modulation], options_tx) |
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| 164 | |
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| 165 | #r = gr.enable_realtime_scheduling() |
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| 166 | #if r != gr.RT_OK: |
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| 167 | # print "Warning: failed to enable realtime scheduling" |
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| 168 | |
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| 169 | #setting up rx options parser |
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| 170 | |
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| 171 | # Create Options Parser: |
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| 172 | parser_rx = OptionParser (option_class=eng_option, conflict_handler="resolve") |
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| 173 | print "printing parser_rx",parser_rx,"!!!!!\n" |
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| 174 | print "after option parser" |
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| 175 | expert_grp_rx = parser_rx.add_option_group("Expert_rx") |
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| 176 | print "printing expert group rx",expert_grp_rx,"@@@@\n" |
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| 177 | parser_rx.add_option("-m", "--modulation", type="choice", choices=demods.keys(), |
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| 178 | default='gmsk', |
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| 179 | help="Select modulation from: %s [default=%%default]" |
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| 180 | % (', '.join(demods.keys()),)) |
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| 181 | print "inside rx option parser" |
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| 182 | receive_path.add_options(parser_rx, expert_grp_rx) |
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| 183 | |
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| 184 | for mod in demods.values(): |
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| 185 | mod.add_options(expert_grp_rx) |
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| 186 | |
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| 187 | (options_rx, args_rx) = parser_rx.parse_args () |
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| 188 | |
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| 189 | if len(args_rx) != 0: |
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| 190 | parser_rx.print_help(sys.stderr) |
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| 191 | sys.exit(1) |
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| 192 | ############# Setting some default values for rx side of the block |
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| 193 | options_rx.rx_freq = 462.5625e6 #setting default rx_freq value |
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| 194 | options_rx.samples_per_symbol = 2 |
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| 195 | options_rx.modulation = 'dbpsk' |
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| 196 | options_rx.fusb_block_size = 4096 |
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| 197 | options_rx.fusb_nblocks = 16 |
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| 198 | options_rx.bitrate = 0.0125e6 |
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| 199 | ############# |
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| 200 | if options_rx.rx_freq is None: |
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| 201 | sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") |
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| 202 | parser_rx.print_help(sys.stderr) |
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| 203 | sys.exit(1) |
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| 204 | print "printing rx options",options_rx,"&&&&\n" |
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| 205 | |
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| 206 | |
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| 207 | # build the graph |
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| 208 | |
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| 209 | tb = my_top_block(mods[options_tx.modulation], |
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| 210 | demods[options_rx.modulation], |
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| 211 | rx_callback,options_tx, |
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| 212 | options_rx) |
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| 213 | r = gr.enable_realtime_scheduling() |
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| 214 | if r != gr.RT_OK: |
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| 215 | print "Warning: failed to enable realtime scheduling" |
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| 216 | |
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| 217 | tb.start() |
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| 218 | #tb.rxpath.get_spec_stats(10) #10 is the number of fft frames that we are looking at to determine the average power |
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| 219 | # generate and send packets |
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| 220 | #print "printing megamytes",options_tx.megabytes," $$$$\n" |
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| 221 | |
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| 222 | #n = 0 |
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| 223 | #pktno = 0 |
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| 224 | #pkt_size = int(options_tx.size) |
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| 225 | #options_tx.megabytes = 0.000048 |
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| 226 | |
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| 227 | #options_tx.size = 6 #2 bytes for packet size,2 bytes for the synchronization request(including redundant bit) and 2 bits to specify the channel number(including redundant bit) |
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| 228 | |
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| 229 | |
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| 230 | myfile = file("logfile.txt", 'w') |
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| 231 | myfile.write("") |
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| 232 | #sending sync packet-format |
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| 233 | global ch |
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| 234 | check =True |
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| 235 | #ch = random.randint(1, 7)#which channel to send information on...this is the second data packet of the synchronization frame |
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| 236 | #resend = 5; #number of times a batch of sync packets is sent on a channel before trying a different channel |
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| 237 | running = True |
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| 238 | #resend_count= 0 #initializing resend count |
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| 239 | sync_pktno = 0 |
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| 240 | #ch = int(random.choice('17')) |
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| 241 | while running: |
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| 242 | ################################################sync mode#################################### |
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| 243 | if mode == "sync": |
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| 244 | #nbytes = int(1e6 * .0003) |
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| 245 | #nbytes = int(1e6 * .0003) |
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| 246 | nbytes = 6 |
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| 247 | pkt_size = 6 |
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| 248 | data_pktno = 0 |
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| 249 | #print "printing packet size",pkt_size,"pkt size\n" |
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| 250 | while sync_status != True: |
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| 251 | #ch = random.randint(1, 7) |
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| 252 | ch = int(random.choice('37')) |
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| 253 | |
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| 254 | #ch = random.randint(6,12) |
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| 255 | #ch = 1 |
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| 256 | hop_freq = float(1e6 * (462.5625+(ch-1)*0.025))#setting the centre freq frequency for sending packets |
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| 257 | print "hop freq is ",hop_freq |
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| 258 | tb.rxpath.min_freq = hop_freq - 80e3 |
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| 259 | tb.rxpath.max_freq = hop_freq + 80e3 |
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| 260 | is_present = tb.rxpath.get_spec_stats(1e13,1) #check if primary user is present |
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| 261 | if is_present == True: #if primary user is there then dont transmit on this channel |
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| 262 | print "Cant use this channel..Primary user detected\n" |
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| 263 | continue |
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| 264 | |
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| 265 | #print "printing status ",status,"\n" |
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| 266 | #print "primary user present = ",is_present,"\n" |
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| 267 | #tb.rxpath.get_spec_stats(10) |
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| 268 | |
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| 269 | |
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| 270 | #hop_freq = float(1e6 * (462.5625+(5-1)*0.05))#setting the centre freq frequency for sending packets |
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| 271 | tb.txpath.set_freq(hop_freq) |
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| 272 | tb.rxpath.set_freq(hop_freq) |
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| 273 | #print "inside while pppp printing sync channel",sync_status," done" |
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| 274 | #if sync_status == "True": |
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| 275 | #print "synchronization done..data channel is found" |
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| 276 | #break |
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| 277 | #else: |
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| 278 | #print "inside else1" |
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| 279 | n = 0 |
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| 280 | |
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| 281 | print >> myfile, "out" |
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| 282 | while n < nbytes: |
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| 283 | #print >> myfile, "inside while" |
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| 284 | if options_tx.from_file is None: |
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| 285 | #data = (pkt_size - 2) * chr(sync_pktno & 0xff) #0xff is 255 |
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| 286 | data = 's'+'s'+str(ch)+str(ch) #adding redundant bits for sync and channel |
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| 287 | #print >> myfile, data |
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| 288 | #print "printing data",data,"****\n" |
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| 289 | else: |
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| 290 | data = source_file.read(pkt_size - 2) |
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| 291 | if data == '': |
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| 292 | break; |
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| 293 | |
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| 294 | payload = struct.pack('!H', sync_pktno & 0xffff) + data |
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| 295 | #print "printing payload",payload,"**\n" |
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| 296 | |
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| 297 | send_pkt(tb,payload) |
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| 298 | #print "printing payload",payload,"**\n" |
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| 299 | n += len(payload) |
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| 300 | sys.stderr.write('.') |
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| 301 | if options_tx.discontinuous and sync_pktno % 5 == 4: |
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| 302 | time.sleep(1) |
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| 303 | sync_pktno += 1 |
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| 304 | #print "before sleeping for 10 seconds and value of resend count is",resend_count |
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| 305 | |
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| 306 | |
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| 307 | time.sleep(0.05) |
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| 308 | #time.sleep(2) |
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| 309 | #resend_count += 1 |
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| 310 | |
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| 311 | print "sync channel found! and it is channel ",ch,"\n" |
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| 312 | mode = "traffic" |
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| 313 | #send_pkt(tb,eof=True) |
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| 314 | #myfile.close() |
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| 315 | #tb.wait() |
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| 316 | ################################################end of sync mode#################################### |
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| 317 | |
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| 318 | ################################################Communications mode#################################### |
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| 319 | if mode == "traffic": |
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| 320 | print "inside traffic mode \n" |
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| 321 | nbytes = 15 |
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| 322 | pkt_size = 15 |
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| 323 | sync_pktno = 0 |
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| 324 | n = 0 |
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| 325 | while n < nbytes: |
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| 326 | #print >> myfile, "inside while" |
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| 327 | if options_tx.from_file is None: |
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| 328 | #data = (pkt_size - 2) * chr(data_pktno & 0xff) #0xff is 255 |
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| 329 | data = 'dHi how are you' #Sending this message |
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| 330 | #print >> myfile, data |
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| 331 | #print "printing data",data,"****\n" |
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| 332 | else: |
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| 333 | data = source_file.read(pkt_size - 2) |
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| 334 | if data == '': |
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| 335 | break; |
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| 336 | |
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| 337 | |
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| 338 | payload = struct.pack('!15s', data) |
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| 339 | #print "printing payload",payload,"**\n" |
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| 340 | |
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| 341 | send_pkt(tb,payload) |
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| 342 | time.sleep(0.5) |
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| 343 | #print "printing payload",payload,"**\n" |
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| 344 | n += len(payload) |
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| 345 | sys.stderr.write('.') |
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| 346 | if options_tx.discontinuous and data_pktno % 5 == 4: |
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| 347 | time.sleep(1) |
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| 348 | data_pktno += 1 |
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| 349 | #print "before sleeping for 10 seconds and value of resend count is",resend_count |
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| 350 | |
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| 351 | tb.rxpath.min_freq = hop_freq - 80e3 |
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| 352 | tb.rxpath.max_freq = hop_freq + 80e3 |
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| 353 | is_present = tb.rxpath.get_spec_stats(1e13,1) #check if primary user is present |
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| 354 | if is_present == True: #if primary user is present then get out of this communication channel, back to sync mode. |
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| 355 | mode = "sync" |
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| 356 | sync_status = False |
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| 357 | print "Moving out of this channel..Primary user detected\n" |
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| 358 | ################################################ end of Communications mode#################################### |
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| 359 | |
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| 360 | |
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| 361 | |
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| 362 | if __name__ == '__main__': |
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| 363 | try: |
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| 364 | main() |
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| 365 | except KeyboardInterrupt: |
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| 366 | pass |
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