Re: [Discuss-gnuradio] Multiple-Transmitter OFDM

<?xml version='1.0' encoding='utf-8'?>
<?grc format='1' created='3.7.13'?>
<flow_graph>
<timestamp>Thu Jan 17 14:32:20 2019</timestamp>
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<value></value>
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<value>2000,2000</value>
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<param>
<key>category</key>
<value>[GRC Hier Blocks]</value>
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<value>no_gui</value>
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<param>
<key>hier_block_src_path</key>
<value>.:</value>
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<value>ofdm_rx_tx_hier_blocks</value>
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<key>id</key>
<value>header_equalizer</value>
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<param>
<key>value</key>
<value>digital.ofdm_equalizer_simpledfe(fft_len, header_mod.base(), occupied_carriers, pilot_carriers, pilot_symbols)</value>
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<value>0</value>
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<key>id</key>
<value>header_formatter</value>
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<param>
<key>value</key>
<value>digital.packet_header_ofdm(occupied_carriers, n_syms=1, len_tag_key=packet_length_tag_key, frame_len_tag_key=length_tag_key, bits_per_header_sym=header_mod.bits_per_symbol(), bits_per_payload_sym=payload_mod.bits_per_symbol(), scramble_header=False)</value>
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<value>0</value>
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<key>value</key>
<value>digital.constellation_bpsk()</value>
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<value></value>
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<value>length_tag_key</value>
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<value>(200, 52)</value>
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<value>0</value>
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<value>min_obuffer</value>
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<value>2**18</value>
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<key>_coordinate</key>
<value>(800, 148)</value>
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<key>_rotation</key>
<value>0</value>
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<key>id</key>
<value>occupied_carriers</value>
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<key>value</key>
<value>(range(-52, -49) + range(-48, -35) + range(-34, -21) + range(-20, -7) + range(-6, 0) + range(1, 7) + range(8, 21) + range(22, 35) + range(36, 49) + range(50, 52),)</value>
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<key>id</key>
<value>occupied_carriers_0</value>
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<value>(range(-90, -77)+range(-76, -63)+range(-62, -49) + range(-48, -35),)</value>
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<value>(1384, 84)</value>
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<value>0</value>
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<key>id</key>
<value>occupied_carriers_1</value>
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<value>(range(36, 49) + range(50, 63) + range(64, 77) + range(78, 91),)</value>
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<key>_rotation</key>
<value>0</value>
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<value>96</value>
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<value>(1040, 12)</value>
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<value>0</value>
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<value>"packet_len"</value>
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<value></value>
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<value>True</value>
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<value>(880, 84)</value>
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<value>0</value>
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<key>id</key>
<value>payload_equalizer</value>
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<key>value</key>
<value>digital.ofdm_equalizer_simpledfe(fft_len, payload_mod.base(), occupied_carriers, pilot_carriers, pilot_symbols, 1)</value>
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<value>0</value>
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<key>id</key>
<value>payload_mod</value>
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<key>value</key>
<value>digital.constellation_qpsk()</value>
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<key>id</key>
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<value>(1528, 28)</value>
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<key>id</key>
<value>pilot_carriers_0</value>
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<value>((-91,-77,-63,-49,-35),)</value>
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<value>(1528, 84)</value>
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<value>0</value>
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<key>id</key>
<value>pilot_carriers_1</value>
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<value>((35,49,63,77,91),)</value>
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<key>_coordinate</key>
<value>(1072, 148)</value>
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<param>
<key>_rotation</key>
<value>0</value>
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<param>
<key>id</key>
<value>pilot_symbols</value>
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<value>((1,-1,1, -1, 1, -1, -1, -1),)</value>
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<value>((-1,1,1,-1,-1),)</value>
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<value>pilot_symbols_1</value>
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<value>0</value>
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<value>30</value>
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<value>(88, 236)</value>
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<key>id</key>
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<value>920e6</value>
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<value>(0, 236)</value>
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<value>180</value>
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<param>
<key>_enabled</key>
<value>1</value>
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<param>
<key>file</key>
<value>/home/rcetin/ofdm_rx_1</value>
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<param>
<key>id</key>
<value>blocks_file_sink_0</value>
</param>
<param>
<key>type</key>
<value>byte</value>
</param>
<param>
<key>unbuffered</key>
<value>False</value>
</param>
<param>
<key>vlen</key>
<value>1</value>
</param>
</block>
<block>
<key>blocks_file_sink</key>
<param>
<key>append</key>
<value>False</value>
</param>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>1</value>
</param>
<param>
<key>file</key>
<value>/home/rcetin/ofdm_rx_2</value>
</param>
<param>
<key>_coordinate</key>
<value>(1480, 540)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>blocks_file_sink_0_0</value>
</param>
<param>
<key>type</key>
<value>byte</value>
</param>
<param>
<key>unbuffered</key>
<value>False</value>
</param>
<param>
<key>vlen</key>
<value>1</value>
</param>
</block>
<block>
<key>blocks_tag_debug</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>display</key>
<value>True</value>
</param>
<param>
<key>_enabled</key>
<value>1</value>
</param>
<param>
<key>_coordinate</key>
<value>(1728, 164)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>blocks_tag_debug_0</value>
</param>
<param>
<key>type</key>
<value>byte</value>
</param>
<param>
<key>filter</key>
<value>""</value>
</param>
<param>
<key>name</key>
<value>Rx'd Packets</value>
</param>
<param>
<key>num_inputs</key>
<value>1</value>
</param>
<param>
<key>vlen</key>
<value>1</value>
</param>
</block>
<block>
<key>blocks_tag_debug</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>display</key>
<value>True</value>
</param>
<param>
<key>_enabled</key>
<value>1</value>
</param>
<param>
<key>_coordinate</key>
<value>(1528, 428)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>blocks_tag_debug_0_0</value>
</param>
<param>
<key>type</key>
<value>byte</value>
</param>
<param>
<key>filter</key>
<value>""</value>
</param>
<param>
<key>name</key>
<value>Rx'd Packets 2</value>
</param>
<param>
<key>num_inputs</key>
<value>1</value>
</param>
<param>
<key>vlen</key>
<value>1</value>
</param>
</block>
<block>
<key>blocks_tagged_stream_to_pdu</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>0</value>
</param>
<param>
<key>_coordinate</key>
<value>(1720, 356)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>blocks_tagged_stream_to_pdu_0</value>
</param>
<param>
<key>type</key>
<value>byte</value>
</param>
<param>
<key>tag</key>
<value>packet_len</value>
</param>
<param>
<key>maxoutbuf</key>
<value>0</value>
</param>
<param>
<key>minoutbuf</key>
<value>min_obuffer</value>
</param>
</block>
<block>
<key>digital_ofdm_rx</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>cp_len</key>
<value>fft_len/4</value>
</param>
<param>
<key>_enabled</key>
<value>1</value>
</param>
<param>
<key>fft_len</key>
<value>fft_len</value>
</param>
<param>
<key>_coordinate</key>
<value>(1368, 204)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>header_mod</key>
<value>"BPSK"</value>
</param>
<param>
<key>id</key>
<value>digital_ofdm_rx_0</value>
</param>
<param>
<key>log</key>
<value>False</value>
</param>
<param>
<key>maxoutbuf</key>
<value>0</value>
</param>
<param>
<key>minoutbuf</key>
<value>min_obuffer</value>
</param>
<param>
<key>occupied_carriers</key>
<value>occupied_carriers_0</value>
</param>
<param>
<key>packet_len_key</key>
<value>packet_length_tag_key</value>
</param>
<param>
<key>payload_mod</key>
<value>"QPSK"</value>
</param>
<param>
<key>pilot_carriers</key>
<value>pilot_carriers_0</value>
</param>
<param>
<key>pilot_symbols</key>
<value>pilot_symbols_0</value>
</param>
<param>
<key>scramble_bits</key>
<value>False</value>
</param>
<param>
<key>sync_word1</key>
<value>()</value>
</param>
<param>
<key>sync_word2</key>
<value>()</value>
</param>
</block>
<block>
<key>digital_ofdm_rx</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>affinity</key>
<value></value>
</param>
<param>
<key>cp_len</key>
<value>fft_len/4</value>
</param>
<param>
<key>_enabled</key>
<value>1</value>
</param>
<param>
<key>fft_len</key>
<value>fft_len</value>
</param>
<param>
<key>_coordinate</key>
<value>(1152, 380)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>header_mod</key>
<value>"BPSK"</value>
</param>
<param>
<key>id</key>
<value>digital_ofdm_rx_0_0</value>
</param>
<param>
<key>log</key>
<value>False</value>
</param>
<param>
<key>maxoutbuf</key>
<value>0</value>
</param>
<param>
<key>minoutbuf</key>
<value>min_obuffer</value>
</param>
<param>
<key>occupied_carriers</key>
<value>occupied_carriers_1</value>
</param>
<param>
<key>packet_len_key</key>
<value>packet_length_tag_key</value>
</param>
<param>
<key>payload_mod</key>
<value>"QPSK"</value>
</param>
<param>
<key>pilot_carriers</key>
<value>pilot_carriers_1</value>
</param>
<param>
<key>pilot_symbols</key>
<value>pilot_symbols_1</value>
</param>
<param>
<key>scramble_bits</key>
<value>False</value>
</param>
<param>
<key>sync_word1</key>
<value>()</value>
</param>
<param>
<key>sync_word2</key>
<value>()</value>
</param>
</block>
<block>
<key>import</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>comment</key>
<value></value>
</param>
<param>
<key>_enabled</key>
<value>True</value>
</param>
<param>
<key>_coordinate</key>
<value>(176, 12)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>import_1</value>
</param>
<param>
<key>import</key>
<value>from gnuradio.digital.utils import tagged_streams</value>
</param>
</block>
<block>
<key>uhd_usrp_source</key>
<param>
<key>alias</key>
<value></value>
</param>
<param>
<key>ant0</key>
<value>RX2</value>
</param>
<param>
<key>bw0</key>
<value>0</value>
</param>
<param>
<key>center_freq0</key>
<value>rx_center_freq</value>
</param>
<param>
<key>dc_offs_enb0</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb0</key>
<value>""</value>
</param>
<param>
<key>norm_gain0</key>
<value>False</value>
</param>
<param>
<key>gain0</key>
<value>rx_gain</value>
</param>
<param>
<key>lo_export0</key>
<value>False</value>
</param>
<param>
<key>lo_source0</key>
<value>internal</value>
</param>
<param>
<key>ant10</key>
<value></value>
</param>
<param>
<key>bw10</key>
<value>0</value>
</param>
<param>
<key>center_freq10</key>
<value>0</value>
</param>
<param>
<key>dc_offs_enb10</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb10</key>
<value>""</value>
</param>
<param>
<key>norm_gain10</key>
<value>False</value>
</param>
<param>
<key>gain10</key>
<value>0</value>
</param>
<param>
<key>lo_export10</key>
<value>False</value>
</param>
<param>
<key>lo_source10</key>
<value>internal</value>
</param>
<param>
<key>ant11</key>
<value></value>
</param>
<param>
<key>bw11</key>
<value>0</value>
</param>
<param>
<key>center_freq11</key>
<value>0</value>
</param>
<param>
<key>dc_offs_enb11</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb11</key>
<value>""</value>
</param>
<param>
<key>norm_gain11</key>
<value>False</value>
</param>
<param>
<key>gain11</key>
<value>0</value>
</param>
<param>
<key>lo_export11</key>
<value>False</value>
</param>
<param>
<key>lo_source11</key>
<value>internal</value>
</param>
<param>
<key>ant12</key>
<value></value>
</param>
<param>
<key>bw12</key>
<value>0</value>
</param>
<param>
<key>center_freq12</key>
<value>0</value>
</param>
<param>
<key>dc_offs_enb12</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb12</key>
<value>""</value>
</param>
<param>
<key>norm_gain12</key>
<value>False</value>
</param>
<param>
<key>gain12</key>
<value>0</value>
</param>
<param>
<key>lo_export12</key>
<value>False</value>
</param>
<param>
<key>lo_source12</key>
<value>internal</value>
</param>
<param>
<key>ant13</key>
<value></value>
</param>
<param>
<key>bw13</key>
<value>0</value>
</param>
<param>
<key>center_freq13</key>
<value>0</value>
</param>
<param>
<key>dc_offs_enb13</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb13</key>
<value>""</value>
</param>
<param>
<key>norm_gain13</key>
<value>False</value>
</param>
<param>
<key>gain13</key>
<value>0</value>
</param>
<param>
<key>lo_export13</key>
<value>False</value>
</param>
<param>
<key>lo_source13</key>
<value>internal</value>
</param>
<param>
<key>ant14</key>
<value></value>
</param>
<param>
<key>bw14</key>
<value>0</value>
</param>
<param>
<key>center_freq14</key>
<value>0</value>
</param>
<param>
<key>dc_offs_enb14</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb14</key>
<value>""</value>
</param>
<param>
<key>norm_gain14</key>
<value>False</value>
</param>
<param>
<key>gain14</key>
<value>0</value>
</param>
<param>
<key>lo_export14</key>
<value>False</value>
</param>
<param>
<key>lo_source14</key>
<value>internal</value>
</param>
<param>
<key>ant15</key>
<value></value>
</param>
<param>
<key>bw15</key>
<value>0</value>
</param>
<param>
<key>center_freq15</key>
<value>0</value>
</param>
<param>
<key>dc_offs_enb15</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb15</key>
<value>""</value>
</param>
<param>
<key>norm_gain15</key>
<value>False</value>
</param>
<param>
<key>gain15</key>
<value>0</value>
</param>
<param>
<key>lo_export15</key>
<value>False</value>
</param>
<param>
<key>lo_source15</key>
<value>internal</value>
</param>
<param>
<key>ant16</key>
<value></value>
</param>
<param>
<key>bw16</key>
<value>0</value>
</param>
<param>
<key>center_freq16</key>
<value>0</value>
</param>
<param>
<key>dc_offs_enb16</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb16</key>
<value>""</value>
</param>
<param>
<key>norm_gain16</key>
<value>False</value>
</param>
<param>
<key>gain16</key>
<value>0</value>
</param>
<param>
<key>lo_export16</key>
<value>False</value>
</param>
<param>
<key>lo_source16</key>
<value>internal</value>
</param>
<param>
<key>ant17</key>
<value></value>
</param>
<param>
<key>bw17</key>
<value>0</value>
</param>
<param>
<key>center_freq17</key>
<value>0</value>
</param>
<param>
<key>dc_offs_enb17</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb17</key>
<value>""</value>
</param>
<param>
<key>norm_gain17</key>
<value>False</value>
</param>
<param>
<key>gain17</key>
<value>0</value>
</param>
<param>
<key>lo_export17</key>
<value>False</value>
</param>
<param>
<key>lo_source17</key>
<value>internal</value>
</param>
<param>
<key>ant18</key>
<value></value>
</param>
<param>
<key>bw18</key>
<value>0</value>
</param>
<param>
<key>center_freq18</key>
<value>0</value>
</param>
<param>
<key>dc_offs_enb18</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb18</key>
<value>""</value>
</param>
<param>
<key>norm_gain18</key>
<value>False</value>
</param>
<param>
<key>gain18</key>
<value>0</value>
</param>
<param>
<key>lo_export18</key>
<value>False</value>
</param>
<param>
<key>lo_source18</key>
<value>internal</value>
</param>
<param>
<key>ant19</key>
<value></value>
</param>
<param>
<key>bw19</key>
<value>0</value>
</param>
<param>
<key>center_freq19</key>
<value>0</value>
</param>
<param>
<key>dc_offs_enb19</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb19</key>
<value>""</value>
</param>
<param>
<key>norm_gain19</key>
<value>False</value>
</param>
<param>
<key>gain19</key>
<value>0</value>
</param>
<param>
<key>lo_export19</key>
<value>False</value>
</param>
<param>
<key>lo_source19</key>
<value>internal</value>
</param>
<param>
<key>ant1</key>
<value>RX2</value>
</param>
<param>
<key>bw1</key>
<value>0</value>
</param>
<param>
<key>center_freq1</key>
<value>930000000</value>
</param>
<param>
<key>dc_offs_enb1</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb1</key>
<value>""</value>
</param>
<param>
<key>norm_gain1</key>
<value>False</value>
</param>
<param>
<key>gain1</key>
<value>0</value>
</param>
<param>
<key>lo_export1</key>
<value>False</value>
</param>
<param>
<key>lo_source1</key>
<value>internal</value>
</param>
<param>
<key>ant20</key>
<value></value>
</param>
<param>
<key>bw20</key>
<value>0</value>
</param>
<param>
<key>center_freq20</key>
<value>0</value>
</param>
<param>
<key>dc_offs_enb20</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb20</key>
<value>""</value>
</param>
<param>
<key>norm_gain20</key>
<value>False</value>
</param>
<param>
<key>gain20</key>
<value>0</value>
</param>
<param>
<key>lo_export20</key>
<value>False</value>
</param>
<param>
<key>lo_source20</key>
<value>internal</value>
</param>
<param>
<key>ant21</key>
<value></value>
</param>
<param>
<key>bw21</key>
<value>0</value>
</param>
<param>
<key>center_freq21</key>
<value>0</value>
</param>
<param>
<key>dc_offs_enb21</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb21</key>
<value>""</value>
</param>
<param>
<key>norm_gain21</key>
<value>False</value>
</param>
<param>
<key>gain21</key>
<value>0</value>
</param>
<param>
<key>lo_export21</key>
<value>False</value>
</param>
<param>
<key>lo_source21</key>
<value>internal</value>
</param>
<param>
<key>ant22</key>
<value></value>
</param>
<param>
<key>bw22</key>
<value>0</value>
</param>
<param>
<key>center_freq22</key>
<value>0</value>
</param>
<param>
<key>dc_offs_enb22</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb22</key>
<value>""</value>
</param>
<param>
<key>norm_gain22</key>
<value>False</value>
</param>
<param>
<key>gain22</key>
<value>0</value>
</param>
<param>
<key>lo_export22</key>
<value>False</value>
</param>
<param>
<key>lo_source22</key>
<value>internal</value>
</param>
<param>
<key>ant23</key>
<value></value>
</param>
<param>
<key>bw23</key>
<value>0</value>
</param>
<param>
<key>center_freq23</key>
<value>0</value>
</param>
<param>
<key>dc_offs_enb23</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb23</key>
<value>""</value>
</param>
<param>
<key>norm_gain23</key>
<value>False</value>
</param>
<param>
<key>gain23</key>
<value>0</value>
</param>
<param>
<key>lo_export23</key>
<value>False</value>
</param>
<param>
<key>lo_source23</key>
<value>internal</value>
</param>
<param>
<key>ant24</key>
<value></value>
</param>
<param>
<key>bw24</key>
<value>0</value>
</param>
<param>
<key>center_freq24</key>
<value>0</value>
</param>
<param>
<key>dc_offs_enb24</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb24</key>
<value>""</value>
</param>
<param>
<key>norm_gain24</key>
<value>False</value>
</param>
<param>
<key>gain24</key>
<value>0</value>
</param>
<param>
<key>lo_export24</key>
<value>False</value>
</param>
<param>
<key>lo_source24</key>
<value>internal</value>
</param>
<param>
<key>ant25</key>
<value></value>
</param>
<param>
<key>bw25</key>
<value>0</value>
</param>
<param>
<key>center_freq25</key>
<value>0</value>
</param>
<param>
<key>dc_offs_enb25</key>
<value>""</value>
</param>
<param>
<key>iq_imbal_enb25</key>
<value>""</value>
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<key>norm_gain25</key>
<value>False</value>
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<value>0</value>
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<key>lo_export25</key>
<value>False</value>
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<value>internal</value>
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<value></value>
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<value>""</value>
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<key>norm_gain26</key>
<value>False</value>
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<value>0</value>
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<value>False</value>
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<key>lo_source26</key>
<value>internal</value>
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<value></value>
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<value>""</value>
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<value>False</value>
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<value>False</value>
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<value></value>
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<value>False</value>
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<value></value>
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<value>False</value>
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<value>""</value>
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<key>iq_imbal_enb30</key>
<value>""</value>
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<key>norm_gain30</key>
<value>False</value>
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<value>False</value>
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<value>internal</value>
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<value></value>
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<value>0</value>
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<value>""</value>
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<key>iq_imbal_enb31</key>
<value>""</value>
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<key>norm_gain31</key>
<value>False</value>
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<value>False</value>
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<value></value>
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<value>0</value>
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<value>0</value>
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<value>""</value>
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<param>
<key>iq_imbal_enb3</key>
<value>""</value>
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<key>norm_gain3</key>
<value>False</value>
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<key>gain3</key>
<value>0</value>
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<value>False</value>
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<value>internal</value>
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<value></value>
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<value>""</value>
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<key>norm_gain4</key>
<value>False</value>
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<value>internal</value>
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<key>ant5</key>
<value></value>
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<value>0</value>
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<value>0</value>
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<key>dc_offs_enb5</key>
<value>""</value>
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<key>iq_imbal_enb5</key>
<value>""</value>
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<key>norm_gain5</key>
<value>False</value>
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<key>gain5</key>
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<value>False</value>
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<value>""</value>
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<key>iq_imbal_enb6</key>
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<key>norm_gain7</key>
<value>False</value>
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<value>False</value>
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<value></value>
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<value>0</value>
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<key>dc_offs_enb9</key>
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<key>iq_imbal_enb9</key>
<value>""</value>
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<key>norm_gain9</key>
<value>False</value>
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<value>""</value>
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<key>dev_args</key>
<value>"addr=192.168.10.2"</value>
</param>
<param>
<key>_enabled</key>
<value>1</value>
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<key>_coordinate</key>
<value>(888, 236)</value>
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<value>0</value>
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<value>uhd_usrp_source_0</value>
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<value></value>
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<value></value>
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<value></value>
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<value></value>
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<value></value>
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<key>minoutbuf</key>
<value>0</value>
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<key>nchan</key>
<value>1</value>
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<key>num_mboards</key>
<value>1</value>
</param>
<param>
<key>type</key>
<value>fc32</value>
</param>
<param>
<key>samp_rate</key>
<value>samp_rate</value>
</param>
<param>
<key>hide_cmd_port</key>
<value>False</value>
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<param>
<key>hide_lo_controls</key>
<value>True</value>
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<value>[]</value>
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<key>sync</key>
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</param>
<param>
<key>otw</key>
<value></value>
</param>
</block>
<connection>
<source_block_id>digital_ofdm_rx_0</source_block_id>
<sink_block_id>blocks_file_sink_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>digital_ofdm_rx_0</source_block_id>
<sink_block_id>blocks_tag_debug_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>digital_ofdm_rx_0</source_block_id>
<sink_block_id>blocks_tagged_stream_to_pdu_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>digital_ofdm_rx_0_0</source_block_id>
<sink_block_id>blocks_file_sink_0_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>digital_ofdm_rx_0_0</source_block_id>
<sink_block_id>blocks_tag_debug_0_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>uhd_usrp_source_0</source_block_id>
<sink_block_id>digital_ofdm_rx_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>uhd_usrp_source_0</source_block_id>
<sink_block_id>digital_ofdm_rx_0_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
</flow_graph>

Hi Kevin,

My FG is attached. Actually, receiver and transmitter uses same OFDM settings. But receiver puts RX signal to two OFDM receivers for getting separate signals using different occupied carriers.

On 20.06.2019 16:55, Kevin Reid wrote:

On Thu, Jun 20, 2019 at 6:24 AM Ramazan Çetin <ramazan.cetin@gohm.com.tr> wrote:

At the end, i decided to give some gap between transmitters. So, 36 to
90 and -36 to -90 are assigned to transmitters. But, result is same. I
have attached two pictures of spectrum. They represents state of one and
two transmitters are active. You can check the situation from there.

I'm not familiar with the details of OFDM systems but that looks like quite adequate separation in the spectrum. Therefore, it seems to me that the problem is most likely your receiver's filter — it is not adequately selecting one signal and not the other. Consider visualizing the output of your low pass filter, and telling us what blocks and parameters you are using.