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 | (pktno,) = struct.unpack('!H', payload[0:2]) |
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62 | #temp = struct.unpack('!s', payload[3:10]) |
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63 | #print "printing the elements of packet",temp,"!!!!!!!!!!!\n" |
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64 | ##################################################### |
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65 | if mode == "sync": |
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66 | (sync_signal,) = struct.unpack('!s', payload[2]) |
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67 | (sync_signal_red,) = struct.unpack('!s', payload[3]) #redundant sync bit |
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68 | (data_channel,) = struct.unpack('!s', payload[4]) |
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69 | (data_channel_red,) = struct.unpack('!s', payload[5]) #redundant channel bit |
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70 | #print "printing the elements of packet ",sync_signal," !!!!!!!!!!! ",sync_signal_red," !!!!!\n" |
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71 | #print "printing the channel ",data_channel_red," !!!!!!!!!!! ",data_channel_red," !!!!!\n" |
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72 | if ok: #== True :# and str(sync_signal) == 'o' and str(sync_signal_red) == 'o': |
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73 | #print "inside if" |
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74 | if ok: #== True: #str(data_channel) == str(data_channel_red): |
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75 | #print "inside if1$$$$$" |
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76 | if str(data_channel) == str(ch): |
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77 | #print "inside if2" |
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78 | sync_status = True |
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79 | #tb.stop() |
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80 | #print "after tb stop ans sync status is ",sync_status," sync status\n" |
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81 | #print "received a sync packet on channel %s\n" %(data_channel) |
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82 | #data = 'o'+'o'+str(data_channel)+str(data_channel) |
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83 | #print "sending this data",data,"@@@@@\n" |
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84 | #sync_pktno=0 |
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85 | #ack_payload = struct.pack('!H', sync_pktno & 0xffff) + data |
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86 | #print "printing the ack packet",ack_payload,"$$$$$\n" |
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87 | #k=0 |
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88 | #while k < 10000: |
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89 | #print "inside while" |
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90 | #send_pkt(tb,ack_payload) #sending back the acknowledgement |
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91 | #k=k+1 |
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92 | ##################################################### |
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93 | |
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94 | ######################### traffic ############################ |
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95 | if mode == "traffic": |
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96 | (data_header,) = struct.unpack('!s', payload[0]) |
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97 | if ok and data_header == 'd': |
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98 | comm = struct.unpack('!14s', data) |
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99 | print("received this ", comm) |
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100 | |
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101 | ############################################################## |
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102 | |
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103 | |
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104 | |
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105 | n_rcvd += 1 |
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106 | if ok: |
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107 | n_right += 1 |
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108 | |
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109 | #print "ok = %5s pktno = %4d n_rcvd = %4d n_right = %4d" % ( |
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110 | #ok, pktno, n_rcvd, n_right) |
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111 | |
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112 | mods = modulation_utils.type_1_mods() |
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113 | demods = modulation_utils.type_1_demods() |
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114 | |
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115 | #setting up the tx options parser |
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116 | parser_tx = OptionParser(option_class=eng_option, conflict_handler="resolve") |
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117 | expert_grp_tx = parser_tx.add_option_group("Expert_tx") |
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118 | print "printing Expert_tx group",expert_grp_tx,"printing Expert_tx group" |
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119 | parser_tx.add_option("-m", "--modulation", type="choice", choices=mods.keys(), |
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120 | default='gmsk', |
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121 | help="Select modulation from: %s [default=%%default]" |
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122 | % (', '.join(mods.keys()),)) |
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123 | |
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124 | parser_tx.add_option("-s", "--size", type="eng_float", default=1500, |
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125 | help="set packet size [default=%default]") |
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126 | parser_tx.add_option("-M", "--megabytes", type="eng_float", default=1.0, |
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127 | help="set megabytes to transmit [default=%default]") |
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128 | parser_tx.add_option("","--discontinuous", action="store_true", default=False, |
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129 | help="enable discontinous transmission (bursts of 5 packets)") |
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130 | parser_tx.add_option("","--from-file", default=None, |
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131 | help="use file for packet contents") |
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132 | print "printing parser_tx",parser_tx,"printing parser_tx" |
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133 | transmit_path.add_options(parser_tx, expert_grp_tx) |
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134 | |
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135 | for mod in mods.values(): |
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136 | mod.add_options(expert_grp_tx) |
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137 | |
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138 | (options_tx, args_tx) = parser_tx.parse_args () |
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139 | |
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140 | if len(args_tx) != 0: |
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141 | parser_tx.print_help() |
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142 | sys.exit(1) |
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143 | ############# Setting some default values for tx side of the block |
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144 | options_tx.tx_freq = 462.5625e6 |
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145 | options_tx.samples_per_symbol = 2 |
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146 | options_tx.modulation = 'dbpsk' |
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147 | options_tx.fusb_block_size = 4096 |
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148 | options_tx.fusb_nblocks = 16 |
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149 | options_tx.bitrate = 0.0125e6 |
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150 | ############# |
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151 | if options_tx.tx_freq is None: |
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152 | sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") |
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153 | parser_tx.print_help(sys.stderr) |
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154 | sys.exit(1) |
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155 | |
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156 | if options_tx.from_file is not None: |
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157 | source_file = open(options_tx.from_file, 'r') |
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158 | print "printing modulation type",mods[options_tx.modulation],"**" |
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159 | # build the graph |
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160 | print "printing tx options",options_tx,"&&&&\n" |
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161 | #tb = my_top_block(mods[options_tx.modulation], options_tx) |
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162 | |
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163 | #r = gr.enable_realtime_scheduling() |
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164 | #if r != gr.RT_OK: |
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165 | # print "Warning: failed to enable realtime scheduling" |
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166 | |
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167 | #setting up rx options parser |
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168 | |
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169 | # Create Options Parser: |
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170 | parser_rx = OptionParser (option_class=eng_option, conflict_handler="resolve") |
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171 | print "printing parser_rx",parser_rx,"!!!!!\n" |
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172 | print "after option parser" |
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173 | expert_grp_rx = parser_rx.add_option_group("Expert_rx") |
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174 | print "printing expert group rx",expert_grp_rx,"@@@@\n" |
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175 | parser_rx.add_option("-m", "--modulation", type="choice", choices=demods.keys(), |
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176 | default='gmsk', |
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177 | help="Select modulation from: %s [default=%%default]" |
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178 | % (', '.join(demods.keys()),)) |
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179 | print "inside rx option parser" |
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180 | receive_path.add_options(parser_rx, expert_grp_rx) |
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181 | |
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182 | for mod in demods.values(): |
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183 | mod.add_options(expert_grp_rx) |
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184 | |
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185 | (options_rx, args_rx) = parser_rx.parse_args () |
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186 | |
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187 | if len(args_rx) != 0: |
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188 | parser_rx.print_help(sys.stderr) |
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189 | sys.exit(1) |
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190 | ############# Setting some default values for rx side of the block |
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191 | options_rx.rx_freq = 462.5625e6 #setting default rx_freq value |
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192 | options_rx.samples_per_symbol = 2 |
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193 | options_rx.modulation = 'dbpsk' |
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194 | options_rx.fusb_block_size = 4096 |
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195 | options_rx.fusb_nblocks = 16 |
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196 | options_rx.bitrate = 0.0125e6 |
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197 | ############# |
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198 | if options_rx.rx_freq is None: |
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199 | sys.stderr.write("You must specify -f FREQ or --freq FREQ\n") |
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200 | parser_rx.print_help(sys.stderr) |
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201 | sys.exit(1) |
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202 | print "printing rx options",options_rx,"&&&&\n" |
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203 | |
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204 | |
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205 | # build the graph |
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206 | |
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207 | tb = my_top_block(mods[options_tx.modulation], |
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208 | demods[options_rx.modulation], |
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209 | rx_callback,options_tx, |
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210 | options_rx) |
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211 | r = gr.enable_realtime_scheduling() |
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212 | if r != gr.RT_OK: |
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213 | print "Warning: failed to enable realtime scheduling" |
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214 | |
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215 | tb.start() |
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216 | #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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217 | # generate and send packets |
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218 | #print "printing megamytes",options_tx.megabytes," $$$$\n" |
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219 | |
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220 | #n = 0 |
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221 | #pktno = 0 |
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222 | #pkt_size = int(options_tx.size) |
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223 | #options_tx.megabytes = 0.000048 |
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224 | |
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225 | #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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226 | |
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227 | |
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228 | myfile = file("logfile.txt", 'w') |
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229 | myfile.write("") |
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230 | #sending sync packet-format |
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231 | global ch |
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232 | check =True |
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233 | #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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234 | #resend = 5; #number of times a batch of sync packets is sent on a channel before trying a different channel |
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235 | running = True |
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236 | #resend_count= 0 #initializing resend count |
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237 | sync_pktno = 0 |
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238 | ch = int(random.choice('17')) |
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239 | while running: |
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240 | ################################################sync mode#################################### |
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241 | if mode == "sync": |
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242 | #nbytes = int(1e6 * .0003) |
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243 | #nbytes = int(1e6 * .0003) |
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244 | nbytes = 6 |
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245 | pkt_size = 6 |
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246 | data_pktno = 0 |
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247 | print "printing packet size",pkt_size,"pkt size\n" |
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248 | while sync_status != True: |
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249 | #ch = random.randint(1, 7) |
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250 | ch = int(random.choice('17')) |
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251 | |
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252 | #ch = random.randint(6,12) |
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253 | #ch = 1 |
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254 | hop_freq = float(1e6 * (462.5625+(ch-1)*0.025))#setting the centre freq frequency for sending packets |
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255 | tb.rxpath.min_freq = hop_freq - 80e3 |
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256 | tb.rxpath.max_freq = hop_freq + 80e3 |
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257 | is_present = tb.rxpath.get_spec_stats(1e13,1) #check if primary user is present |
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258 | if is_present == True: #if primary user is there then dont transmit on this channel |
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259 | continue |
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260 | |
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261 | #print "printing status ",status,"\n" |
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262 | #print "primary user present = ",is_present,"\n" |
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263 | #tb.rxpath.get_spec_stats(10) |
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264 | print "hop freq is ",hop_freq |
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265 | |
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266 | #hop_freq = float(1e6 * (462.5625+(5-1)*0.05))#setting the centre freq frequency for sending packets |
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267 | tb.txpath.set_freq(hop_freq) |
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268 | tb.rxpath.set_freq(hop_freq) |
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269 | #print "inside while pppp printing sync channel",sync_status," done" |
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270 | #if sync_status == "True": |
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271 | #print "synchronization done..data channel is found" |
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272 | #break |
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273 | #else: |
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274 | #print "inside else1" |
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275 | n = 0 |
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276 | |
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277 | print >> myfile, "out" |
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278 | while n < nbytes: |
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279 | print >> myfile, "inside while" |
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280 | if options_tx.from_file is None: |
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281 | #data = (pkt_size - 2) * chr(sync_pktno & 0xff) #0xff is 255 |
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282 | data = 's'+'s'+str(ch)+str(ch) #adding redundant bits for sync and channel |
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283 | #print >> myfile, data |
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284 | #print "printing data",data,"****\n" |
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285 | else: |
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286 | data = source_file.read(pkt_size - 2) |
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287 | if data == '': |
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288 | break; |
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289 | |
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290 | payload = struct.pack('!H', sync_pktno & 0xffff) + data |
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291 | #print "printing payload",payload,"**\n" |
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292 | |
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293 | send_pkt(tb,payload) |
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294 | #print "printing payload",payload,"**\n" |
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295 | n += len(payload) |
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296 | sys.stderr.write('.') |
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297 | if options_tx.discontinuous and sync_pktno % 5 == 4: |
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298 | time.sleep(1) |
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299 | sync_pktno += 1 |
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300 | #print "before sleeping for 10 seconds and value of resend count is",resend_count |
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301 | |
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302 | |
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303 | time.sleep(0.05) |
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304 | #time.sleep(2) |
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305 | #resend_count += 1 |
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306 | |
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307 | print "sync channel found! and it is channel ",ch,"\n" |
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308 | mode = "traffic" |
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309 | #send_pkt(tb,eof=True) |
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310 | #myfile.close() |
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311 | #tb.wait() |
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312 | ################################################end of sync mode#################################### |
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313 | |
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314 | ################################################Communications mode#################################### |
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315 | if mode == "traffic": |
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316 | print "inside traffic mode \n" |
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317 | nbytes = 15 |
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318 | pkt_size = 15 |
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319 | sync_pktno = 0 |
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320 | while n < nbytes: |
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321 | #print >> myfile, "inside while" |
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322 | if options_tx.from_file is None: |
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323 | #data = (pkt_size - 2) * chr(data_pktno & 0xff) #0xff is 255 |
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324 | data = 'dHi how are you' #Sending this message |
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325 | #print >> myfile, data |
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326 | #print "printing data",data,"****\n" |
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327 | else: |
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328 | data = source_file.read(pkt_size - 2) |
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329 | if data == '': |
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330 | break; |
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331 | |
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332 | |
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333 | payload = struct.pack('!15s', data) |
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334 | #print "printing payload",payload,"**\n" |
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335 | |
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336 | send_pkt(tb,payload) |
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337 | #print "printing payload",payload,"**\n" |
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338 | n += len(payload) |
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339 | sys.stderr.write('.') |
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340 | if options_tx.discontinuous and data_pktno % 5 == 4: |
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341 | time.sleep(1) |
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342 | data_pktno += 1 |
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343 | #print "before sleeping for 10 seconds and value of resend count is",resend_count |
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344 | #time.sleep(0.1) |
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345 | tb.rxpath.min_freq = hop_freq - 80e3 |
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346 | tb.rxpath.max_freq = hop_freq + 80e3 |
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347 | is_present = tb.rxpath.get_spec_stats(1e13,10) #check if primary user is present |
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348 | if is_present == True: #if primary user is present then get out of this communication channel, back to sync mode. |
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349 | mode = "sync" |
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350 | |
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351 | ################################################ end of Communications mode#################################### |
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352 | |
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353 | |
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354 | |
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355 | if __name__ == '__main__': |
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356 | try: |
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357 | main() |
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358 | except KeyboardInterrupt: |
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359 | pass |
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