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WiMax System Analysis Using

XFdtd® and Wireless InSite ®

Kyle L. Labowski

Joseph J. Rokita

Modern Communication Systems

Network • LTE, WiMax, etc.

networks require consideration for coverage and capacity

• May require modification for special events or moving/shifting populations

• Intended coverage for normal, “Business Day” operation

• Intended coverage for “Special Event” operation

Antenna Array Modeling in XFdtd

• Circular array of dipoles

• Phase between elements

set based upon:

– Number of elements

– Width of array

– Desired main beam

direction

• “Design and optimization

of an antenna array for

WiMax base stations”

Antenna Array Modeling in XFdtd

• Circular array of

dipoles

• Element phase

– Proper Phasing

between elements

creates directionality

– Allows electronically

steering of beam

direction

Antenna Array Modeling in XFdtd

• Circular array of

dipoles

• Element phase

– Proper Phasing

between elements

creates directionality

– Allows electronically

steering of beam

direction

Antenna Array Modeling in XFdtd

• Circular array of

dipoles

• Element phase

– Proper Phasing

between elements

creates directionality

– Allows electronically

steering of beam

direction

Antenna Array Modeling in XFdtd

• Circular array of

dipoles

• Element phase

– Proper Phasing

between elements

creates directionality

– Allows electronically

steering of beam

direction

Antenna Array Modeling in XFdtd

• Circular array of

dipoles

• Element phase

– Proper Phasing

between elements

creates directionality

– Allows electronically

steering of beam

direction

Antenna Array Modeling in XFdtd

• Circular array of

dipoles

• Element phase

– Proper Phasing

between elements

creates directionality

– Allows electronically

steering of beam

direction

XFdtd: Parameterization

• Parameters • Equations

• Math functions

• Units

• Auto completes

previously used

parameters

XFdtd: XACT® Mesh Coarse Mesh 80.9 MB

Fine Mesh 160.2 MB

XACT Mesh 86.5 MB

XFdtd: Parameter Sweep

• The feed points can be parameterized and a

sweep performed to quickly iterate through

various configurations and beam patterns.

Single Parameter Sweep Multiple Parameter Sweep

XFdtd: Modeling Beam Steering

No Phase Offset Main Beam Phi = 0

Main Beam Phi = 180 Main Beam Phi = 270

XFdtd: XStream GPU Acceleration

• XStream®, Remcom’s GPU acceleration

technology, allows each simulation to be

performed at a fraction of the time needed

using CPUs only.

XFdtd: XStream GPU Acceleration

XFdtd: Generate Optimal Far-Zone Patterns

XFdtd: Export Far-Zone Pattern

• Once modeling the antenna array is completed

using XFdtd, the sample far-zone patterns can

be sent to Wireless InSite to analyze in-situ

performance.

Transfer Far-Zone Pattern from

XFdtd to Wireless InSite • Once modeling the antenna

array is completed using XFdtd,

the sample far-zone patterns

can be sent to Wireless InSite

to analyze in-situ performance.

Analyze Array Performance Using

Wireless InSite • Wireless InSite can be

used to determine coverage and throughput for different configurations of antenna pattern.

• The WiMax carrier wishes to provide coverage for the hi-rise section of the city during normal working hours.

• The beam can be shifted to provide better coverage for the stadium during football games and other events without modifying any physical installation.

Wireless InSite: Import Terrain

• Start by importing

terrain

Wireless InSite: Import Terrain

• Start by importing terrain

• Can be flat, irregular,

or imported from a

DTED or DEM

database

Wireless InSite: Import 3D Building

Data • Import 3D

building (“city”)

data

• Can be obtained

from DXF or ESRI

shapefiles

• In this case, we

have a model of

part of the city of

Chicago, as well

as Soldier Field.

Wireless InSite: Import 3D Building

Data • Import 3D

building (“city”)

data

• Can be obtained

from DXF or ESRI

shapefiles

• In this case, we

have a model of

part of the city of

Chicago, as well

as Soldier Field.

Wireless InSite: Place Transmitters

and Receivers

Wireless InSite: Place Transmitters

and Receivers

Wireless InSite: Place Transmitters

and Receivers

Wireless InSite: Assign Waveform

and Run Simulation

• Assign desired waveform

• Run simulation using Full

3D propagation model

Wireless InSite: XStream 3D

Acceleration (V 2.6)

• New XStream 3D model can utilize GPU technology

to enhance calculation speed

• Take-away: 2-19x speed-up

(30 Faces) (1,000 Faces) (5,200 Faces)

Wireless InSite: XStream 3D

Acceleration (V 2.6)

• New XStream 3D model can utilize GPU technology

to enhance calculation speed

• Take-away: Hours Minutes

(30 Faces) (1,000 Faces) (5,200 Faces)

Wireless InSite: Quickly Obtain

Results • Iterate quickly to

determine the

optimal

configuration

• The best beam-formed

far-zone pattern

provides coverage for

each scenario

Wireless InSite: Data Throughput

Analysis (Rel. 2.6)

• Throughput

toolbox

provides

analysis for

LTE and WiMax

configurations

Wireless InSite: Data Throughput

Analysis

• Coverage for

Business Hours

• Coverage for

Stadium Event

Summary

• XFdtd and Wireless InSite can be used to model the device as placed into a Communications System Network.

• Advanced features speed iterations, to allow engineers to rapidly optimize the network with minimal disruptions.

Read more about XFdtd and Wireless InSite,

watch videos, and download this presentation at:

www.remcom.com/mtt-ims-2011

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live web demonstration:

www.remcom.com 1-814-861-1299

sales@remcom.com