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cisco-power: Add comments to explain some of the math.

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This commit is contained in:
Ben Greear
2020-10-12 10:39:11 -07:00
parent b08b3af1f3
commit c89cef3bde
1 changed files with 17 additions and 0 deletions
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17
lf_cisco_power.py
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@@ -1026,6 +1026,9 @@ def main():
if (m != None): if (m != None):
_rxrate = m.group(1) _rxrate = m.group(1)
# ath10k radios now take noise-floor into account, so adjust_nf
# should remain set to false when using those radios. Possibly other
# radios would need this, so leave code in place.
rssi_adj = 0 rssi_adj = 0
if (args.adjust_nf and _noise_bare != None): if (args.adjust_nf and _noise_bare != None):
_noise_i = int(_noise_bare) _noise_i = int(_noise_bare)
@@ -1051,6 +1054,11 @@ def main():
print("rssi_to_use == combined: sig: %s"%sig) print("rssi_to_use == combined: sig: %s"%sig)
calc_dbm = int(sig) + pi + rssi_adj calc_dbm = int(sig) + pi + rssi_adj
print("calc_dbm %s"%(calc_dbm)) print("calc_dbm %s"%(calc_dbm))
# Calculated per-antenna power is what we calculate the AP transmitted
# at (rssi + pathloss). So, if we see -30 rssi, with pathloss of 50,
# then we calculate AP transmitted at +20
calc_ant1 = 0 calc_ant1 = 0
if (ants[0] != ""): if (ants[0] != ""):
calc_ant1 = int(ants[0]) + pi + rssi_adj calc_ant1 = int(ants[0]) + pi + rssi_adj
@@ -1077,12 +1085,19 @@ def main():
pf = 1 pf = 1
pfs = "PASS" pfs = "PASS"
pfrange = pf_dbm; pfrange = pf_dbm;
# Allowed per path is what we expect the AP should be transmitting at.
# calc_ant1 is what we calculated it actually transmitted at based on rssi
# and pathloss. Allowed per-path is modified taking into account that multi
# NSS tranmission will mean that each chain should be decreased so that sum total
# of all chains is equal to the maximum allowed txpower.
allowed_per_path = cc_dbmi allowed_per_path = cc_dbmi
if (int(_nss) == 1): if (int(_nss) == 1):
diff_a1 = calc_ant1 - cc_dbmi diff_a1 = calc_ant1 - cc_dbmi
if (abs(diff_a1) > pfrange): if (abs(diff_a1) > pfrange):
pf = 0 pf = 0
if (int(_nss) == 2): if (int(_nss) == 2):
# NSS of 2 means each chain should transmit at 1/2 total power, thus the '- 3'
allowed_per_path = cc_dbmi - 3 allowed_per_path = cc_dbmi - 3
diff_a1 = calc_ant1 - allowed_per_path diff_a1 = calc_ant1 - allowed_per_path
diff_a2 = calc_ant2 - allowed_per_path diff_a2 = calc_ant2 - allowed_per_path
@@ -1090,6 +1105,7 @@ def main():
(abs(diff_a2) > pfrange)): (abs(diff_a2) > pfrange)):
pf = 0 pf = 0
if (int(_nss) == 3): if (int(_nss) == 3):
# NSS of 3 means each chain should transmit at 1/3 total power, thus the '- 5'
allowed_per_path = cc_dbmi - 5 allowed_per_path = cc_dbmi - 5
diff_a1 = calc_ant1 - allowed_per_path diff_a1 = calc_ant1 - allowed_per_path
diff_a2 = calc_ant2 - allowed_per_path diff_a2 = calc_ant2 - allowed_per_path
@@ -1099,6 +1115,7 @@ def main():
(abs(diff_a3) > pfrange)): (abs(diff_a3) > pfrange)):
pf = 0 pf = 0
if (int(_nss) == 4): if (int(_nss) == 4):
# NSS of 4 means each chain should transmit at 1/4 total power, thus the '- 6'
allowed_per_path = cc_dbmi - 6 allowed_per_path = cc_dbmi - 6
diff_a1 = calc_ant1 - allowed_per_path diff_a1 = calc_ant1 - allowed_per_path
diff_a2 = calc_ant2 - allowed_per_path diff_a2 = calc_ant2 - allowed_per_path