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hamnet70-gnuradio-legacy
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Updated preamble based on walsh-hadamard sequence 

This should improve the correlation behaviour.
This commit is contained in:
Thomas Kolb 2019-09-11 21:29:20 +02:00
parent 6f72013aaa
commit 9ef01a3e5f
3 changed files with 59 additions and 12 deletions
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4
grc/hamnet70_demod_sc16qam.grc
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59
grc/hamnet70_mod_sc16qam.grc
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@ -340,7 +340,7 @@
</param>
<param>
<key>value</key>
<value>[1, -1, -1, 1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, 1, -1, 1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 1, 1, -1, -1, 1, 1, 1, 1]</value>
<value>[-1, -1, -1, 1, 1, 1, 1, -1, 1, 1, 1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, 1, 1, -1, -1, -1, -1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1, 1, -1, 1, -1, -1, 1, -1, 1, -1, -1, 1]</value>
</param>
</block>
<block>
@ -1116,6 +1116,53 @@
<value>0xFF</value>
</param>
</block>
<block>
<key>hamnet70_insert_pilot_symbols</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>2</value>
</param>
<param>
<key>_coordinate</key>
<value>(1980, 443)</value>
</param>
<param>
<key>_rotation</key>
<value>0</value>
</param>
<param>
<key>id</key>
<value>hamnet70_insert_pilot_symbols_0</value>
</param>
<param>
<key>offsets</key>
<value>[len(preamble)+128, len(preamble)+256]</value>
</param>
<param>
<key>maxoutbuf</key>
<value>0</value>
</param>
<param>
<key>minoutbuf</key>
<value>0</value>
</param>
<param>
<key>pilot_sequence</key>
<value>[1+1j, -1-1j, 1-1j, -1+1j]</value>
</param>
</block>
<block>
<key>import</key>
<param>
@ -1347,7 +1394,7 @@
</param>
<param>
<key>_coordinate</key>
<value>(1972, 451)</value>
<value>(2188, 451)</value>
</param>
<param>
<key>_rotation</key>
@ -1415,7 +1462,7 @@
</connection>
<connection>
<source_block_id>blocks_tagged_stream_mux_0</source_block_id>
<sink_block_id>virtual_sink_0</sink_block_id>
<sink_block_id>hamnet70_insert_pilot_symbols_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
@ -1473,6 +1520,12 @@
<source_key>pdu_out</source_key>
<sink_key>in</sink_key>
</connection>
<connection>
<source_block_id>hamnet70_insert_pilot_symbols_0</source_block_id>
<sink_block_id>virtual_sink_0</sink_block_id>
<source_key>0</source_key>
<sink_key>0</sink_key>
</connection>
<connection>
<source_block_id>interp_fir_filter_xxx_0</source_block_id>
<sink_block_id>pad_sink_0</sink_block_id>

8
utils/filter_preamble.py
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@ -4,13 +4,7 @@ import numpy as np
import matplotlib.pyplot as pp
import rrc
pre = [1, -1, -1, 1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, 1, -1, 1,
-1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1,
1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, 1, -1, 1, -1, 1, -1, -1, -1, -1,
-1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, 1,
-1, 1, 1, -1, 1, 1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1,
-1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 1,
1, -1, -1, 1, 1, 1, 1]
pre = [-1, -1, -1, 1, 1, 1, 1, -1, 1, 1, 1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, 1, 1, -1, -1, -1, -1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1, 1, -1, 1, -1, -1, 1, -1, 1, -1, -1, 1]
pre_up = np.zeros(2 * len(pre) + 1)