1. No category

January 2015
[email protected]
2
Portable Wireless Test Applications
Multipath emulation
Interference generation
Roaming / hand-off
Throughput
Throughput vs. rotation
Video and multi-room emulation
www.octoscope.com
3
Key Wireless Test Capabilities
Throughput performance
Complete isolation
Controlled interference
Roaming behavior (sticky clients)
Interoperability (vendor to vendor)
Emulate a multi-room house
https://www.youtube.com/watch?v=NYbUKICCNeo
www.octoscope.com
4
Throughput Test Configuration
•
octoBox
Devices in the testbed
DUT orientation vs. test
antennas
Turn table rotation speed
Traffic generation (iperf or
IxChariot)
Test Antennas
quadAtten
Traffic
TX/RX
DUT AP
•
Multipath Emulator
Master client
Remote
Desktop
Powerful test automation
controls
Automated graphical test
reporting lets you
Automatically compile
multiple results files into a
single Excel plot
Save hours or days of
laborious testing and data
logging
Eliminate human error
Ship better tested devices
months sooner
www.octoscope.com
5
Throughput vs. Range Test Automation
OB-THROUGHPUT script controls iperf or IxChariot, turn table and programmable attenuators, outputs Excel plot
TCP Throughput
400
Each point on the plot may be averaged over
time (e.g. 1 minute) for statistically valid result.
Each point can also simultaneously be
averaged vs. DUT orientation with respect to
test antennas. Averaging = repeatability.
350
Throughput (Mbps)
300
250
200
150
100
50
0
0
10
20
30
40
Attenuation Setting (dB)
50
60
www.octoscope.com
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Throughput vs. Range vs. Orientation Test Automation
OB-THROUGHPUT
script controls iperf or
IxChariot, turn table
and programmable
attenuators, outputs
Excel plot
www.octoscope.com
octoBox Testbed Configuration Tutorial
https://www.youtube.com/watch?v=GwKcxrXAbeU
www.octoscope.com
8
Key Wireless Test Capabilities
Throughput performance
Complete isolation
Controlled interference
Roaming behavior (sticky clients)
Interoperability (vendor to vendor)
Emulate a multi-room house
https://www.youtube.com/watch?v=SKl857UkO04
www.octoscope.com
9
Jperf Run in the 5 GHz Band, 80 MHz Channel
octoBox door closed
octoBox door open
Contention with outside Wi-Fi traffic
when the octoBox door is open makes
measurements erratic and nonrepeatable.
www.octoscope.com
10
Jperf Run in the 2.4 GHz Band, 20 MHz Channel
octoBox door closed
octoBox door open
www.octoscope.com
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Achieving Repeatability
• Complete isolation
octoBox testbed design with filtered
data and power connections provides
complete isolation
Reference measurement
TX antenna
RX antenna
Door open
RX antenna
Isolation measurement from back
Door closed
www.octoscope.com
12
Isolation and Filtering
•
Creating controlled RF conditions with good isolation is
challenging, particularly for large-scale RF testbeds, such
as multi-room home or a mesh network.
Short wavelength high frequency signals couple via many
paths, including copper cabling, poor/aging gasketing,
ground loops, etc. Sources of interference may be difficult to
locate in a multi-box setup.
•
AC power filter
Fan
Isolation considerations
Up to 4 high
speed data filters
Fits up to 4 filters
Isolation should be measured and specified with a fully
cabled test setup.
All copper cabling, including Ethernet and power cabling, will
act as antennas contributing to RF coupling among
enclosures and thus limiting attenuation range setting.
Upfront investment into high grade enclosures with good
data and power feed-through filtering and absorptive foam
can save 1-2 months of chasing uncontrolled paths of
interference in the test setup.
octoBox feed-through high
speed data filters
www.octoscope.com
13
Filters
Internal side
OBS-05
Ethernet filter
OBS-06
USB filter
OBS-08
HDMI filter
OBS-07
DC filter
External side
www.octoscope.com
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Achieving Repeatability
• Anechoic (non-echoing)
>20dB of absorption allows for OTA (over the air) testing which is essential when
working with devices with embedded antennas (laptops, cellphones etc.)
www.octoscope.com
15
octoBox-26 Internal View
Small octoBox
GPS antenna
Filtered
USB
Filtered
Ethernet
Wi-Fi
antenna
Cellular
antenna
13.35”
DUT shelf
Plastic rails and shelf
www.octoscope.com
Antennas and Cable Connections
www.octoscope.com
octoBox vs. Common Shield Box
https://www.youtube.com/watch?v=Q6xIcTSVKeo
www.octoscope.com
18
Key Wireless Test Capabilities
Throughput performance
Complete isolation
Controlled interference
Roaming behavior (sticky clients)
Interoperability (vendor to vendor)
Emulate a multi-room house
www.octoscope.com
19
octoBox iGen Interference Generator
•
Generates Wi-Fi traffic or an interference
waveform
•
Traffic…
Realistic traffic with contention ON/OFF selection
Can be captured traffic for replay or supplied
packet sequence
Software controlled: gap between packets, packet
length, channel frequency and width
•
Waveform can be a radar emulation for 802.11h
DFS testing or other common interference
source, such as OOK signal or a frequency
hopping signal
ACI = adjacent channel interference
OOK = on off keying
802.11 ACI significantly
impacts performance
www.octoscope.com
20
Key Wireless Test Capabilities
Throughput performance
Complete isolation
Controlled interference
Roaming behavior (sticky clients)
Interoperability (vendor to vendor)
Emulate a multi-room house
https://www.youtube.com/watch?v=jGThhcHmwUc
www.octoscope.com
21
octoBox Roaming Testbed
AP1
conducted
4
AP2
conducted
Ping PC
quadAtten
Ethernet
Ping PC
4
Pinging Linux PCs
RF combiner
4
quadAtten
octoBox
Console
4
Console
4
OTA
Ethernet filter
Note: APs can be replaced by base stations for
2G/3G/LTE roaming testing
OB-26 triStack
OTA = over the air
www.octoscope.com
22
Roaming Test Script
Controls motion, velocity, distance between APs,
pinging, graphical reporting
The octoBox testbed supports multi-AP multiclient roaming scenarios
www.octoscope.com
23
Key Wireless Test Capabilities
Throughput performance
Complete isolation
Controlled interference
Roaming behavior (sticky clients)
Interoperability (vendor to vendor)
Emulate a multi-room house
https://www.youtube.com/watch?v=CaNxaTXCWWc
www.octoscope.com
Wi-Fi Alliance
Testbed
www.octoscope.com
Ethernet filters
Wi-Fi Alliance Testbed in an
OB-38 triStack
Wireless Sniffer
Sigma
UCC
Sigma AP
Control Agent
WFA
EMT
RF combiner
Ethernet Switch
5n
Sigma
PC End Point
RADIUS
Server
DUT
…
Ethernet Switch
5n
Control Ethernet
Test Ethernet
Ethernet Switch
n = MIMO order of testbed devices
www.octoscope.com
Vendor to Vendor Interoperability
• Use throughput or
roaming testbed to test
throughput performance
or roaming behavior with
devices from different
vendors
• The entire Wi-Fi Alliance
testbed can be housed
in an OB-38 triStack
configuration
Ethernet
Traffic
endpoint
octoBox
Test Antennas
quadAtten
Ethernet, power
DUT AP
Test
antennas
DUT AP
Multipath Emulator
MPE
Bridge
Ethernet
Console
Ethernet
Bridge
USB or Ethernet/POE
www.octoscope.com
27
Key Wireless Test Capabilities
Throughput performance
Complete isolation
Controlled interference
Roaming behavior (sticky clients)
Interoperability (vendor to vendor)
Emulate a multi-room house
https://www.youtube.com/watch?v=UTXtebyORQA
www.octoscope.com
28
Multiple Boxes to Emulate Multli-room Connected House
Controlled environment octoBox
testbed emulating a multi-room house
Three OB-38 triStacks
Source: Multimedia over Coax Alliance
www.octoscope.com
29
Testbed Emulating an 8-room House + Basement Video Gateway
Video, data over Wi-Fi testbed
www.octoscope.com
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Emulate Walls and Distance

octoBox quadAtten emulates walls, floors/ceilings, space and motion of devices.
=
www.octoscope.com
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Emulate Multipath

MPE module emulates multipath
reflections from walls and other surfaces.
Matches the IEEE 802.11 models of a
typical house or a typical office.
MPE (Multipath emulator)
=
www.octoscope.com
32
Generate Interference

octoBox iGen interference
generator generates realistic
multi-channel interference.
=
www.octoscope.com
33
octoBox Controlled Test Environment
Technologies Applications
Wi-Fi
Throughput
LTE
Roaming
2G/3G
Wi-Fi Alliance
Bluetooth
Wireless video
ZigBee
Coexistence
Proprietary
Multi-node/mesh
Capabilities
MIMO (up to 8x8)
Multipath + path loss
Multi-channel interference
Turn table for realistic results
Completely isolated
Stackable, configurable, portable
Powerful test automation
www.octoscope.com
Controlled Environment Essential for Meaningful Results
Wi-Firate
DUT’s data rate adaptation
Expected
behavior
adaptation
vs.vs. RSSI all the way down
Not returning to
RSSI to the RSSI level of -95 dBm.
54 Mbps
Data rate
vs.
Measured DUT RSSI is less than
-95 dBm. This means Master to
DUT coupling
RSSIof less than -100 dBm.
•
Rate adaptation isn’t optimum – DUT is not
returning to the maximum data rate of
802.11g of 54 Mbps
•
High isolation enables testing all the way
down to the bottom of the RX dynamic range
(-96 dBm in this example)
•
Wi-Fi RX is sensitive enough to receive a
small fraction of a microvolt and hence
requires complete isolation from outside
noise to enable observing the real
performance or DUT behavior (e.g. rate or
MCS adaptation)
www.octoscope.com
35
Customer Value Proposition
• Repeatable RF environment makes wireless measurements easy to manage
• Automation accelerates data collection and time to market; improves quality
• Graphical reporting helps visualize device performance or behavior issues
Portable wireless test platform delivers cost-effective
high performance repeatable MIMO OTA environment
www.octoscope.com
36
Contact
[email protected]
Phone: +1.978.222.3114
Littleton, MA
USA
www.octoscope.com