1. 4G2-01 WiMAX vs. LTE Implications for Practical Device Applications
Paul Tornatta, CTO
SkyCross Inc.
January 20, 2010

2. SkyCross Company Introduction LTE vs. WiMAX in North America
Agenda
SkyCross Company Introduction
LTE vs. WiMAX in North America
Frequency Allocation
Range loss
User Platform Consideration
Summary
Conclusions

3. 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

4. Personal/Home Entertainment
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
Handsets
Smartphone
Femtocell
Smart Grid
AND MORE –
our technology is versatile!
Computing
Personal/Home Entertainment
Personal Navigation Device
USB dongle
Personal Media/Game Players
PC Card
Wireless Audio
Ultra-mobile PC
Home Entertainment
Laptop

5. 4G Frequency Allocations
Carrier
Application
Band
Bandwidth
Verizon
LTE
Band 13
20 MHz
AT&T
Band 17
24 MHz
Clear
WiMAX
Band 7
120 MHz
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

6. 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

7. 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

8. Simulation - 700 MHz MIMO Handset Antenna Implementation
Efficiency:
30-40%
VSWR: <2:1
Patterns almost identical
CC: >0.8
Coupling:
-4dB

9. Simulation - 700 MHz MIMO Handset Antenna Implementation – Isolated Mode Technique
Efficiency %
VSWR <2.2:1
CC: <0.35
Isolation:
<-13 dB
Significantly different patterns results in low envelope correlation coefficient

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

11. Thank You!