Openmoko Bug #2043: GTA02 WiFi signal reception too weak
Openmoko Public Trac
bugs at docs.openmoko.org
Tue Sep 30 13:15:12 CEST 2008
#2043: GTA02 WiFi signal reception too weak
---------------------+------------------------------------------------------
Reporter: vnevoa | Owner: openmoko-devel
Type: defect | Status: new
Priority: normal | Milestone:
Component: unknown | Version: Om2008.8
Severity: normal | Keywords:
Blockedby: | Reproducible: always
Blocking: |
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Software: OM2008.9 with "testing" feeds. Updated and rebooted today.
Comparing the Neo FR's wifi signal strength to other portable systems
apparently indicates that the FR's wifi system has very bad signal
reception. This may be at the root of many of the other numerous wifi
tickets.
Use case: placed the FR and a Eee901 side-by-side, and scanned for
wireless networks on both. (I had to switch off the Eee901 before scanning
with the FR, or the interference would kill the signal on the FR).
Here the output of both scans:
===========Eee901=========
vasco at van-eee:~$ iwlist scan
ra0 Scan completed :
Cell 01 - Address: 00:11:88:A4:6B:62
ESSID:"INTERNET"
Mode:Managed
Channel:6
Quality:20/100 Signal level:-82 dBm Noise level:-97
dBm
Encryption key:off
Bit Rates:36 Mb/s
Cell 02 - Address: 00:21:29:8A:C5:EE
ESSID:"linksys"
Mode:Managed
Channel:5
Quality:34/100 Signal level:-76 dBm Noise level:-97
dBm
Encryption key:off
Bit Rates:36 Mb/s
Cell 03 - Address: 00:11:88:A4:6B:60
ESSID:""
Mode:Managed
Channel:6
Quality:15/100 Signal level:-84 dBm Noise level:-97
dBm
Encryption key:off
Bit Rates:36 Mb/s
Cell 04 - Address: 00:14:BF:65:86:2A
ESSID:"INS"
Mode:Managed
Channel:7
Quality:20/100 Signal level:-82 dBm Noise level:-97
dBm
Encryption key:on
Bit Rates:11 Mb/s
Cell 05 - Address: 00:14:7C:B1:D8:B2
ESSID:""
Mode:Managed
Channel:11
Quality:15/100 Signal level:-84 dBm Noise level:-97
dBm
Encryption key:on
Bit Rates:22 Mb/s
=========Neo FR==========
root at om-gta02:~# iwlist scan
eth0 Scan completed :
Cell 01 - Address: 00:21:29:8A:C5:EE
ESSID:"linksys"
Mode:Master
Frequency:2.432 GHz (Channel 5)
Quality=4/94 Signal level=-91 dBm Noise level=-95
dBm
Encryption key:off
Extra:bcn_int=100
Cell 02 - Address: 00:11:88:A4:6B:60
ESSID:""
Mode:Master
Frequency:2.437 GHz (Channel 6)
Quality=4/94 Signal level=-91 dBm Noise level=-95
dBm
Encryption key:off
Extra:bcn_int=100
So, the FR "sees" only 2 networks instead of 5.
And for the strongest network, it shows Signal/Noise of -91dBm/-95dBm when
the Eee901 shows -76dBm/-97dBm.
I think its ok that the FR has 2dBm more noise level (smaller device, more
compact electronics, more EMI), but it worries me that the signal level is
15dBm lower!...
Desired behavior: FR should identify all present networks and be able to
connect to those that have an acceptable signal power, just like other
mobile devices.
--
Ticket URL: <https://docs.openmoko.org/trac/ticket/2043>
docs.openmoko.org <http://docs.openmoko.org/trac/>
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