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octoBox MPE (multipath emulator) • octoBox MPE (multipath emulator) creates multipath inside octoBox ... •Insertion loss: 6 dB at 6000 MHz, typ ... CTIA, “Test Plan for Mobile

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  • [email protected]

    octoBox MPE (multipath

    emulator) Testbed

    1

    May 2014

    mailto:[email protected]

  • www.octoscope.com

    Introduction - Multipath Emulator

    • Wi-Fi manufacturers and evaluators test throughput performance in open air ‘real-life’ environment (e.g. a typical house or office) or using

    channel emulators.

    • octoScope has developed an octoBoxTM based testbed that creates multipath closely approaching the IEEE 802.11n/ac Models B or C [1],

    emulating home and small office environment.

    • octoBox MPE (multipath emulator) creates multipath inside octoBox small anechoic chamber by generating reflections with stubs of coaxial

    cable. A quad multipath emulator fixture supports up to 4-stream

    MIMO.

    • octoBox-MPE has been simulated, prototyped, measured and compared to the IEEE models.

    • Data throughput tests have been performed by www.smallnetbuilder.com on a 2x2 and a 3x3 802.11ac MIMO

    configuration demonstrating MIMO gains inside octoBox with

    equivalent or higher throughput to that measured in a representative

    home environment.

    • See SmallNetBuilder.com test results at this link: http://www.smallnetbuilder.com/wireless/wireless-howto/32082-how-we-test-

    wireless-products-revison-7

    2

    octoBox-MPE module (stacked in the

    middle) emulates IEEE 802.11n/ac

    Models B or C [1] corresponding to

    home and small office environment.

    Patents pending

    MPE module

    http://www.octoscope.com/ http://www.smallnetbuilder.com/

  • www.octoscope.com

    octoBox-MPE MIMO OTA Testbed Diagram

    3

    OTA = over the air

    octoBox

    DUT AP

    Test Antennas

    Master Client

    Traffic

    TX/RX

    Remote

    Desktop

    Attenuators

    Ethernet

    Filter

    Ethernet

    Filter

    Multipath

    segment

    octoBox-26 MPE Stack

    http://www.octoscope.com/

  • www.octoscope.com

    quadAtten Module – Programmable Attenuators

    • Frequency range: DC to 6000 MHz

    • Dynamic range: 63 dB

    • Step: 0.5 dB

    • Insertion loss: 6 dB at 6000 MHz, typ

    • 1 dB compression: 30 dBm

    • IP3: 55 dBm

    • Ethernet/PoE power and control interface (single line control and power)

    • USB power and control interface

    • Provided PC software automates attenuation control and MIMO

    throughput vs. range measurements

    4

    New

    quadAtten

    module

    Isolated

    well enough

    to be

    mounted

    externally

    http://www.octoscope.com/

  • www.octoscope.com

    OB-38-TT Internal View – Turntable Model

    5

    http://www.octoscope.com/

  • www.octoscope.com

    Automated MIMO Throughput vs. Range Test

    6

    0

    50

    100

    150

    200

    250

    300

    350

    400

    0 10 20 30 40 50 60

    T h

    ro u

    g h

    p u

    t (M

    b p

    s)

    Attenuation Setting (dB)

    TCP Throughput

    Measured using octoBox MPE testbed using automated throughput script - early 802.11ac device

    http://www.octoscope.com/English/Products/octoBox_MPE/octoBox_MPE.html

    Multiple points can be measured

    Repeatable controlled environment

    Measurement process is automated

    Script controls IxChariot and programmable attenuators, outputs Excel plot

    OB-38 MPE Stack

    MPE

    MPE = multi path emulator

    http://www.octoscope.com/ http://www.octoscope.com/English/Products/octoBox_MPE/octoBox_MPE.html

  • www.octoscope.com

    octoBox-TT (Turntable) Plot

    7

    0

    20

    40

    60

    80

    100

    120

    140

    160

    180

    200 -180

    -165

    -150

    -135

    -120

    -105

    -90

    -75

    -60

    -45

    -30

    -15 0

    15

    30

    45

    60

    75

    90

    105

    120

    135

    150

    165

    Throughput vs. rotation angle

    0dB (Mbps)

    5dB (Mbps)

    10dB (Mbps)

    15dB (Mbps)

    20dB (Mbps)

    25dB (Mbps)

    30dB (Mbps)

    40dB (Mbps)

    45dB (Mbps)

    50dB (Mbps)

    55dB (Mbps)

    60dB (Mbps)

    Mbps

    http://www.octoscope.com/

  • www.octoscope.com

    CONFIDENTIALCONFIDENTIAL

    www.octoscope.com

    CONFIDENTIAL 8

    Watch video at this link: http://www.youtube.com/watch?v=04JOt-3aivg

    OB-38-TT model

    http://www.octoscope.com/ http://www.octoscope.com/ http://www.youtube.com/watch?v=04JOt-3aivg

  • www.octoscope.com

    octoBox-MPE vs. Conventional Fader

    octoBox-MPE Conventional Fader

    Multipath fading Y Y

    Doppler fading Y

    Time variable fading Y

    Channel model programmability Several fixed channel model

    modules can be stacked

    Y

    Channel modeling capabilities Up to 4 clusters, up to ~200

    meter distance for reflections

    All standards based models and

    custom models

    Frequency range Up to 6 GHz, and higher 400 MHz – 6 GHz

    Channel width Flexible, 160 MHz supported 100 MHz

    Bi-directional Over the air (OTA) Y May require custom channel

    models, power amplifiers, etc.

    9

    http://www.octoscope.com/

  • www.octoscope.com

    802.11n Channel Models - Summary

    10

    Model [1] Distance to 1st

    wall (avg)

    # taps Delay

    spread

    (rms)

    Max delay # clusters

    A* test model 1 0 ns 0 ns

    B Residential 5 m 9 15 ns 80 ns 2

    C small office 5 m 14 30 ns 200 ns 2

    D typical office 10 m 18 50 ns 390 ns 3

    E large office 20 m 18 100 ns 730 ns 4

    F large space

    (indoor or outdoor)

    30 m 18 150 ns 1050 ns 6

    * Model A is a flat fading model; no delay spread and no multipath

    http://www.octoscope.com/

  • www.octoscope.com

    Model B – 2 Clusters Specifications

    11

    Source: [1] Appendix C

    http://www.octoscope.com/

  • www.octoscope.com

    octoBox-MPE vs. IEEE Model B

    12

    Model B 0ns 10 ns 20ns 30ns 40ns 50ns 60ns 70ns 80ns

    Cluster 1 0 -5.4 -10.8 -16.2 -21.7

    Cluster 2 -3.2 -6.3 -9.4 -12.5 -15.6 -18.7 -21.8

    Time domain response obtained from measured frequency domain

    http://www.octoscope.com/

  • www.octoscope.com

    Background

    13

    Measured Frequency Response 2.4 GHz band

    5 GHz band

    http://www.octoscope.com/

  • www.octoscope.com

    Measured Frequency Response

    14

    Entire spectrum to 6 GHz – measured on prototype fixture using VNA

    http://www.octoscope.com/

  • www.octoscope.com

    octoBox MPE Testbed

    • The octoBox MPE testbed ships

    assembled and ready to

    us in a crate

    • The crate door also acts as a ramp, making

    it easy to wheel the

    system out and get

    started

    15

    octoBox-38 MPE Stack

    http://www.octoscope.com/

  • www.octoscope.com

    References 1. IEEE, 802.11-03/940r4: TGn Channel Models; May 10, 2004

    2. IEEE, 11-09-0569 , “TGac Channel Model Addendum Supporting Material”, May 2009

    3. Schumacher et al, "Description of a MATLAB® implementation of the Indoor MIMO WLAN channel model proposed

    by the IEEE 802.11 TGn Channel Model Special Committee", May 2004

    4. IEEE 802.11-09/0308r12, “TGac Channel Model Addendum”, March 18, 2010

    5. IEEE, 11-09-0334-08-00ad-channel-models-for-60-ghz-wlan-systems

    6. Schumacher et al, "From antenna spacings to theoretical capacities - guidelines for simulating MIMO systems"

    7. Schumacher reference software for implementing and verifying 802.11n models -

    http://www.info.fundp.ac.be/~lsc/Research/IEEE_80211_HTSG_CMSC/distribution_terms.html

    8. 3GPP 36-521, UE Conformance Specification, Annex B

    9. 3GPP TR 25.996, "3rd Generation Partnership Project; technical specification group radio access networks; Spatial

    channel model for MIMO simulations“

    10. IST-WINNER II Deliverable 1.1.2 v.1.2, “WINNER II Channel Models”, IST-WINNER2, Tech. Rep., 2008

    (http://projects.celtic-initiative.org/winner+/deliverables.html)

    11. 3GPP TR37.976, MIMO OTA channel models

    12. 3GPP TS 34.114: “User Equipment (UE) / Mobile Station (MS) Over The Air (OTA) Antenna Performance

    Conformance Testing”

    13. CTIA, “Test Plan for Mobile Station Over the Air Performance - Method of Measurement for Radiated RF Power and

    Receiver Performance”, Revision 3.1, January 2011

    16

    http://www.octoscope.com/ http://www.info.fundp.ac.be/~lsc/Research/IEEE_80211_HTSG_CMSC/distribution_terms.html http://projects.celtic-initiative.org/winner+/deliverables.html

  • www.octoscope.com

    Contact

    [email protected] Tel: +1.222.3114

    • Visit our website at www.octoscope.com

    17

    Thank you!

    http://www.octoscope.com/ mailto:[email protected] http://www.octoscope.com/

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