Final Examination

1
Presentation 17

• Final Examination
• Final Reports
• Review of Spread Spectrum
• Ed and team Review of WiMax Costs

2
Final Examination

• The Exam will be on Monday March 17
• From 730 to 930
• Open-book bring calculators
• Problems will cover full course, any questions
  included on homework and midterm may be included.
• Ill try to keep calculations more reasonable

3
Final Reports

• Also due on March 17
• 15 to 20 pages
• Part I review of hardware (5 to 10 pages)
• Part II country report, include the issues
  covered in lecture
• A network plan to connect the rural region with
  low-cost WIMAX. VSAT where needed.Use local labor
  where possible
• Public access through roving cell phones and
  internet cafes or kiosks.
• Local Banking (micro) to keep capital in the
  community and bring in remissions and development
  loans
• Commerce based on internet trade with WTO
• Local ownership or regulation with cooperative
  marketing.( Suggestion of Dr. Khan that core be
  financed by local government for its services
  with public access added.)
• Local radio broadcasting.

4
Discuss Health and Education Services

• Educational computer supplement to Classrooms.
• Adult education in literacy and local economic
  issues.
• Local Teacher Education
• Online textbook distribution and local printing.
• Local addition of culture to courses with
  enrichment of cultural values.
• Distribution of local supplements Wikipedia
• Training health workers and linking with field
  hospitals

5
Early Spread Spectrum
6
Direct Sequence Spread Spectrum
7
Demodulating Direct Sequence Spread Spectrum
8
FDMA vs CDMA
9
Adjacent Channel Protection in FDMA, TDMA CDMA
10
CDMA Must SoftHand off because of very low
protection
11
Comparison of Cellular System Capacities
12
Recent article on Spread Spectrum efficiency
13
WiMax Network Projections

• E Katz
• D Labunsky

14
Wireless Network

• Central hub supports multiple users using
  multiple applications, mostly Internet and VoIP
  telephony

15
Assumptions

• Assume that the major differences between WiFi
  and WiMax are
• Software
• Power levels allowed (ERP)
• This implies that most of the hardware required
  for a WiMax network will eventually be priced
  comparably to that required by a WiFi network
  today, with the exception of antennae and some
  physical infrastructure

16
More assumptions

• We will limit our analysis to the last mile
  network, i.e. we assume local availability of
• Power
• A high place to put the antenna
• Some high bandwidth internet access (i.e. fiber
  optic, satellite ground station, WiMax Backhaul,
  etc.)
• Customers wanting internet service will need
  computers. We do not require high performance,
  however, and could easily make do with obsolete
  systems, donated by industrialized nations

17
Access Point

• Assuming WiMax CPE will be priced comparably to
  WiFi equipment available today
• Wireless router/access point
• Linksys WRTP54G-ER Wireless-G 54Mbps Broadband
  Router with Earthlink VoIP Service - 39.99
• Linksys WRT54GL Wireless-G Linux Router - 59.99
• Linksys WRTP54G Wireless-G Vonage VoIP Router -
  59.99
• Wireless Access Point
• Linksys WAP54G Wireless-G Access Point -
  79.99
• Netgear WG602 54Mbps Wireless Access Point -
  79.99
• D-Link DWL-2100AP 108Mbps Wireless Access Point
  w/ SNMP AES - Price 99.99

18
Local Transceiver Antennae

• Assumed to be at about 16 dB Gain
• Assumed to run in the 2.4-2.5 GHz range
• Good transmission, relatively low attenuation
• In the US , there is an amateur band at 900 MHz
  2.4 GHz

19
Andrews Corporation2.4-2.5GHz 17dBi Grid Ant

• 17 dBi (mid)N Male
• Die cast grid antenna is manufactured with
  magnesium alloy, stainless steel and aluminum.
  Weighs 33 less than aluminum antennas with no
  rust.
• Max Wind 140 MPH
• List106.00
• Gold68.90

20
More Antennae
 
 

• 13 dBi (mid)
• N Female Flat panel 60 degree sector antenna.
  Lightweight and rugged. Standard antenna mounts.
• List595.00
• Gold422.45  317.63
• 14.0 dBi (mid)
• N Female Lightweight and rugged Spread
  Spectrum/ISM band parabolic antenna. Mount
  provides fine adjustment of azimuth and
  elevation. Radome is included
• List450.00
• Gold297.00

21
Customer Premise Equipment- PCI Cards

• Notebook Mobile Adapters
• Netgear WN511T RangeMax Next Wireless N PC-Card
  Notebook Adapter - Price 99.99
• Linksys WPC54G 54Mbps Wireless-G PC Notebook
  Adapter - Price 49.99
• Buffalo CB-G54HP PC-Card AirStation High Power
  Wireless Notebook Adapter - Price 49.99
• Wireless PCI Card Adapters
• Linksys WMP54GS Wireless-G PCI Card with
  SpeedBooster - Price 59.99
• D-Link DWL-G510 54Mbps Wireless-G PCI Card -
  19.99
• Netgear WG311 54Mbps Wireless-G PCI Adapter for
  Desktop Computers - Price 39.99

22
Customer Premise Equipment- VoIP Phones

• Direct-to-LAN phones
• Hitachi IP-5000 - Hitachi-Cable Wireless
  IPC-5000 WiFi SIP VoIP Wireless phone 299.95
• Phones With PC Base Stations
• Grandstream GXP-2000 - 78.95
• Grandstream Budgetone GS-101 Black SIP IP Phone
  37.99 
• KeySpan VP-24A Cordless VoIP Phone (Skype) 66.99
  

23
VoIP for Existing Cell phonesOne Example is
TruPhone

• TruPhone
• Software provider
• TruPhone Software makes VoIP calls from any LAN
• Requires a phone compatible with TruPhone
  Software
• Nokia's E-series and N-series phones
• Calling landlines in other countries from their
  mobile (from US)
• UK 3.2c/min
• China 3.2c
• Mexico City 3.6c
• Japan 5.5c
• Calling international mobiles(from US)
• India 18.4c/min
• UK mobiles 23.1c
• China mobiles 3.3c
• Japan mobiles 24.0c

24
A sample system- A WiMax point serves N
computer/phone stations

• Linksys WRT54GL Wireless-G Linux Router (
  59.99)
• Andrews Grid Antenna (106.00)
• D-Link DWL-G510 54Mbps Wireless-G PCI Card -
  (N19.99)
• Grandstream Budgetone GS-101 Black SIP IP Phone
  (N37.99)
• Donated PC (0) 
• Total 165.99 N57.98
• Let N 10 Stations, Total cost 745.79