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New preamble and header modulation to assist phase tracking 

Also, the new symbols give more power to the sync parts, which should
make the sync more robust.
This commit is contained in:
Thomas Kolb 2019-09-25 23:51:48 +02:00
parent f38ad55b10
commit c805bee1fb
3 changed files with 169 additions and 83 deletions
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216
grc/hamnet70_demod_sc16qam.grc
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@ -36,71 +36,135 @@ blocks:
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(-0.7778965069363739-0.7778965069363739j), (0.19672922787199323+0.19672922787199323j),
(0.8053026272676546+0.8053026272676546j), (0.15962425611814487+0.15962425611814487j),
(-0.8137238460807423-0.8137238460807423j), (-0.9215764973541457-0.9215764973541457j),
(-0.609918904259522-0.609918904259522j), (-0.6668473580346201-0.6668473580346201j),
(-0.7839911528474385-0.7839911528474385j), (-0.6418964722093792-0.6418964722093792j),
(-0.6554268264967297-0.6554268264967297j), (-0.8849046342212495-0.8849046342212495j),
(-0.7317384814481425-0.7317384814481425j), (-0.03259813363664732-0.03259813363664732j),
(0.7055538541773648+0.7055538541773648j), (1.0248825368497154+1.0248825368497154j),
(0.7268408407840553+0.7268408407840553j), (-0.056954175409504475-0.056954175409504475j),
(-0.7298952394033935-0.7298952394033935j), (-0.862388190907787-0.862388190907787j),
(-0.6984645278411455-0.6984645278411455j), (-0.6068937129219674-0.6068937129219674j),
(-0.6939114111904727-0.6939114111904727j), (-0.8671951461489478-0.8671951461489478j),
(-0.7334642243259445-0.7334642243259445j), (-0.04799627890206295-0.04799627890206295j),
(0.7250084426992481+0.7250084426992481j), (1.0172542273316627+1.0172542273316627j),
(0.7183416410512831+0.7183416410512831j), (-0.0393421058267044-0.0393421058267044j),
(-0.754313065831116-0.754313065831116j), (-0.8473572919418604-0.8473572919418604j),
(-0.636527393457419-0.636527393457419j), (-0.7287891872618689-0.7287891872618689j),
(-0.7778654465178765-0.7778654465178765j)]'
states:
bus_sink: false
bus_source: false
@ -124,7 +188,7 @@ blocks:
id: variable_constellation_rect
parameters:
comment: ''
const_points: '[1, -1]'
const_points: '[1+1j, -1-1j]'
imag_sect: '2'
precision: '8'
real_sect: '2'
@ -238,12 +302,20 @@ blocks:
id: variable
parameters:
comment: ''
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: '[(-1-1j), (1+1j), (1+1j), (1+1j), (-1-1j), (1+1j), (1+1j), (1+1j), (-1-1j),
(1+1j), (-1-1j), (1+1j), (1+1j), (1+1j), (-1-1j), (1+1j), (-1-1j), (-1-1j),
(1+1j), (-1-1j), (1+1j), (1+1j), (1+1j), (1+1j), (-1-1j), (1+1j), (1+1j), (1+1j),
(-1-1j), (-1-1j), (1+1j), (1+1j), (-1-1j), (1+1j), (1+1j), (-1-1j), (-1-1j),
(-1-1j), (1+1j), (-1-1j), (-1-1j), (1+1j), (-1-1j), (-1-1j), (1+1j), (-1-1j),
(-1-1j), (1+1j), (-1-1j), (1+1j), (1+1j), (1+1j), (1+1j), (1+1j), (-1-1j), (1+1j),
(-1-1j), (-1-1j), (-1-1j), (-1-1j), (-1-1j), (-1-1j), (1+1j), (1+1j), (1+1j),
(-1-1j), (-1-1j), (-1-1j), (-1-1j), (-1-1j), (1+1j), (-1-1j), (1+1j), (-1-1j),
(-1-1j), (1+1j), (-1-1j), (1+1j), (1+1j), (1+1j), (1+1j), (1+1j), (1+1j), (-1-1j),
(1+1j), (1+1j), (1+1j), (1+1j), (1+1j), (1+1j), (1+1j), (-1-1j), (-1-1j), (-1-1j),
(1+1j), (-1-1j), (1+1j), (1+1j), (-1-1j), (-1-1j), (-1-1j), (1+1j), (-1-1j),
(1+1j), (-1-1j), (-1-1j), (-1-1j), (1+1j), (1+1j), (-1-1j), (-1-1j), (1+1j),
(-1-1j), (-1-1j), (-1-1j), (-1-1j), (-1-1j), (1+1j), (1+1j), (-1-1j), (-1-1j),
(-1-1j), (-1-1j), (1+1j), (1+1j), (-1-1j), (-1-1j), (-1-1j)]'
states:
bus_sink: false
bus_source: false

28
grc/hamnet70_mod_sc16qam.grc
View File

@ -96,7 +96,7 @@ blocks:
id: variable_constellation_rect
parameters:
comment: ''
const_points: '[1, -1]'
const_points: '[1+1j, -1-1j]'
imag_sect: '2'
precision: '8'
real_sect: '2'
@ -159,12 +159,20 @@ blocks:
id: variable
parameters:
comment: ''
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: '[(-1-1j), (1+1j), (1+1j), (1+1j), (-1-1j), (1+1j), (1+1j), (1+1j), (-1-1j),
(1+1j), (-1-1j), (1+1j), (1+1j), (1+1j), (-1-1j), (1+1j), (-1-1j), (-1-1j),
(1+1j), (-1-1j), (1+1j), (1+1j), (1+1j), (1+1j), (-1-1j), (1+1j), (1+1j), (1+1j),
(-1-1j), (-1-1j), (1+1j), (1+1j), (-1-1j), (1+1j), (1+1j), (-1-1j), (-1-1j),
(-1-1j), (1+1j), (-1-1j), (-1-1j), (1+1j), (-1-1j), (-1-1j), (1+1j), (-1-1j),
(-1-1j), (1+1j), (-1-1j), (1+1j), (1+1j), (1+1j), (1+1j), (1+1j), (-1-1j), (1+1j),
(-1-1j), (-1-1j), (-1-1j), (-1-1j), (-1-1j), (-1-1j), (1+1j), (1+1j), (1+1j),
(-1-1j), (-1-1j), (-1-1j), (-1-1j), (-1-1j), (1+1j), (-1-1j), (1+1j), (-1-1j),
(-1-1j), (1+1j), (-1-1j), (1+1j), (1+1j), (1+1j), (1+1j), (1+1j), (1+1j), (-1-1j),
(1+1j), (1+1j), (1+1j), (1+1j), (1+1j), (1+1j), (1+1j), (-1-1j), (-1-1j), (-1-1j),
(1+1j), (-1-1j), (1+1j), (1+1j), (-1-1j), (-1-1j), (-1-1j), (1+1j), (-1-1j),
(1+1j), (-1-1j), (-1-1j), (-1-1j), (1+1j), (1+1j), (-1-1j), (-1-1j), (1+1j),
(-1-1j), (-1-1j), (-1-1j), (-1-1j), (-1-1j), (1+1j), (1+1j), (-1-1j), (-1-1j),
(-1-1j), (-1-1j), (1+1j), (1+1j), (-1-1j), (-1-1j), (-1-1j)]'
states:
bus_sink: false
bus_source: false
@ -340,14 +348,16 @@ blocks:
parameters:
affinity: ''
alias: ''
comment: ''
comment: 'Dirty hack: scale symbols up
by roughly sqrt(2)'
dimension: '1'
in_type: byte
maxoutbuf: '0'
minoutbuf: '0'
num_ports: '1'
out_type: complex
symbol_table: header_mod.points()
symbol_table: '[p*1.41 for p in header_mod.points()]'
states:
bus_sink: false
bus_source: false

8
utils/filter_preamble.py
View File

@ -4,9 +4,9 @@ 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 = np.array([ -1, 1, 1, 1, -1, 1, 1, 1, -1, 1, -1, 1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, 1, 1, 1, -1, -1, 1, 1, -1, 1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, -1, 1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, 1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, -1, 1, -1, -1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, 1, -1, -1, -1]) * (1+1j)
pre_up = np.zeros(2 * len(pre) + 1)
pre_up = np.zeros(2 * len(pre) + 1, dtype=complex)
pre_up[1::2] = pre
@ -14,6 +14,10 @@ rrc_coef = rrc.rrc_design(150, 2)
pre_flt = np.convolve(pre_up, rrc_coef, mode='same')
print("===== Preamble =====")
print(list(pre))
print("===== Filtered Preamble =====")
print(list(pre_flt))
pp.plot(pre_up)