def test_best_modulation_code(self, model):
e = model.enum
m = model
# Make sure it's the lowest
m.override(e.allocation_hz, 1e9)
m.override(e.cn0_db, 65)
m.override(e.target_margin_db, 5)
code = m.best_modulation_code
assert m.best_modulation_code.name == 'BPSK'
# Make sure it's the middle
m.override(e.allocation_hz, 1e6)
m.override(e.cn0_db, 70)
m.override(e.target_margin_db, 5)
assert m.best_modulation_code.name == 'QPSK'
# Make sure it's the highest
m.override(e.allocation_hz, 1e3)
m.override(e.cn0_db, 65)
m.override(e.target_margin_db, 5)
assert m.best_modulation_code.name == '8PSK'
# Verify asymmetric spectral efficiencies work
perf = [
pylink.Code("Usable", 1, .5, 4),
pylink.Code("Unusable", 1e-5, 1e5, 4),
]
m.override(e.modulation_performance_table, perf)
m.override(e.allocation_hz, 1e6)
m.override(e.target_margin_db, 3)
m.override(e.cn0_db, 60 + 7.02 + 5)
code = m.best_modulation_code
assert code.name == 'Usable'
def test_modulation_code_obj(self, model):
e = model.enum
m = model
perf = [pylink.Code("BPSK", .5, .5, 4)]
m.override(e.modulation_performance_table, perf)
code = m.best_modulation_code
assert code
# check the initial values
assert code.name == 'BPSK'
assert abs(code.esn0_db - 4.0) < 1e-5
assert abs(code.tx_eff - .5) < 1e-5
assert abs(code.rx_eff - .5) < 1e-5
# check the ebn0
assert abs(code.ebn0_db - 7.0102) < 1e-4
# check another ebn0
perf = [pylink.Code("8PSK", 2, 2, 12)]
m.override(e.modulation_performance_table, perf)
code = m.best_modulation_code
assert abs(code.ebn0_db - 8.9898) < 1e-4
@pytest.fixture
def attenuator_1db():
return pylink.Element(gain_db=-1,
noise_figure_db=1,
name='attenuator')
@pytest.fixture
def amplifier_10db():
return pylink.Element(gain_db=10,
noise_figure_db=3,
name='amplifier')
perf = [
pylink.Code("BPSK", .5, .5, 4),
pylink.Code("QPSK", 1, 1, 8),
pylink.Code("8PSK", 2, 2, 13),
]
@pytest.fixture
def model():
return pylink.DAGModel([pylink.Geometry(),
pylink.Antenna(is_rx=True),
pylink.Interconnect(is_rx=True),
pylink.Receiver(),
pylink.Transmitter(),
pylink.Interconnect(is_rx=False),
pylink.Antenna(is_rx=False),
pylink.Channel(),