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4G2-01 WiMAX vs. LTE Implications for Practical Device Applications. Paul Tornatta, CTO SkyCross Inc. January 20, 2010. Agenda. SkyCross Company Introduction LTE vs. WiMAX in North America Frequency Allocation Range loss User Platform Consideration Summary Conclusions. About Us.

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4g2 01 wimax vs lte implications for practical device applications

4G2-01WiMAX vs. LTEImplications for Practical Device Applications

Paul Tornatta, CTO

SkyCross Inc.

January 20, 2010

agenda
Agenda
  • SkyCross Company Introduction
  • LTE vs. WiMAX in North America
    • Frequency Allocation
    • Range loss
    • User Platform Consideration
  • Summary
  • Conclusions
about us
About Us

SkyCross is a global designer and manufacturer of one-stop antenna solutions for a variety of wireless devices

  • Founded in 2000
  • Headquarters in Viera, Florida
    • Global Locations: China, Korea, Japan, Taiwan
  • Privately held with strong financial partners
    • Intel Capital
    • Investor Growth Capital: > $1B investments
    • TL Ventures: > $1.5B under management
  • 4-Yr Revenue Growth  55% CAGR
  • > 500 Employees
  • Strong IP Portfolio >140 Global Patents
markets served
Markets Served

Our multi-band/mode antennas enable increased functionality – voice, data, video, location, audio – in any wireless device without compromising style.

Mobile Phones

Networking

Router/ Access Point

Femtocell

Smart Grid

Handsets

Smartphone

AND MORE –

our technology is versatile!

Computing

Personal/Home Entertainment

USB dongle

Personal Navigation Device

Personal Media/Game Players

PC Card

Ultra-mobile PC

Wireless Audio

Home Entertainment

Laptop

4g frequency allocations
4G Frequency Allocations
  • LTE and WiMAX use similar modulation schemes and have similar spectral efficiency
  • WiMAX implementation in North America has a significant advantage in total bandwidth available to service a large number of customers
range loss comparison 700 mhz vs 2600 mhz
Range Loss Comparison – 700 MHz vs. 2600 MHz
  • LTE in North America is implemented in the 700 MHz band
  • WiMAX is implemented in the 2600 MHz band
  • LTE has a significant advantage in coverage range and footprint over WiMAX

dBm

750 MHz

2600 MHz

mimo antenna implementation issues
MIMO Antenna Implementation Issues

What works for 3G will not be good enough for 4G

  • MIMO antenna performance is greatly effected by device geometry
  • Handset geometries are small in terms of wavelength in the 700 MHz band making it difficult to implement MIMO antennas
  • Handset geometries are larger in terms of wavelength at 2600 MHz making MIMO antenna implementation more practical

Freespace Wavelength at 750 MHz ~ 400 mm

Maximum Dimension Resonance = 1150 MHz

w=60 mm

L=110 mm

Freespace Wavelength at 2600 MHz ~ 115 mm

simulation 700 mhz mimo handset antenna implementation
Simulation - 700 MHz MIMO Handset Antenna Implementation

Efficiency:

30-40%

VSWR: <2:1

Patterns almost identical

CC: >0.8

Coupling:

-4dB

simulation 700 mhz mimo handset antenna implementation isolated mode technique
Simulation - 700 MHz MIMO Handset Antenna Implementation – Isolated Mode Technique

Efficiency 50-58%

VSWR <2.2:1

CC: <0.35

Isolation:

<-13 dB

Significantly different patterns results in low envelope correlation coefficient

summary conclusions
Summary / Conclusions
  • LTE 700 is capacity limited for a given data rate
  • WiMAX at 2.6 GHz is range limited for a given data rate
  • 700 MHz MIMO handset antenna implementation requires specialized techniques
  • WiMAX and LTE each have benefits and drawbacks
  • WiMAX and LTE will likely coexist each filling particular needs for data rates, coverage and capacity

What works for 3G will not be good enough for 4G

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