1. IEEE 802.16 (Wire less MAN) Name: Ehsan Rohani
Master: Dr. S.M.Fakhraeii
Figure Ref.

2. Out line: Abstract 802.16 Features 802.16a Features 802.16b Features
PHY Block Diagram
802.16a Features
802.16a – A Viable BWA Solution
802.16a Technical Specifications
802.16b Features
Some details about PHY Layer

3. Abstract Fixed Broadband Wireless Access (BWA) Why BWA?
Fixed Broadband Wireless Channels
Combining TDMA and FDMA
TDMA operation
FDMA operation
IEEE
IEEE Issues

4. Fixed Broadband Wireless Access (BWA)
New “last mile” access technology
Offers high speed voice, data and video servicend es
Broadband access currently dominated by DSL and cable modem technologies

5. Why BWA? Advantages of BWA Challenges for BWA
Ease of deployment and installation
Much higher data rates can be supported
Capacity can be increased by installing more base stations
Challenges for BWA
Price
Performance
Interoperability issues

6. Fixed Broadband Wireless Channels
Cells are less than 10 km in radius
Rooftop or window installed omni-directional antennas (2-10m) at the receiver
15-40 m base station antennas
Variety of terrain and tree density types

7. TDMA operation

8. FDMA operation

9. Combining TDMA and FDMA
TDMA + FDMA operation = OFDMA

10. IEEE 802.16 IEEE Standard 802.16-2001 [1], completed in
October 2001 and published on 8 April 2002
It now has a standard for second generation wireless metropolitan area networks
USA specification designed to provide the "firstmile/last-mile" connection in wireless metropolitan area networks(MAN)

11. IEEE 802.16 10-66 GHz range, single carrier modulation LoS propagation
2 to 11 GHz region due to be added during 2002
LoS propagation
Supports continuously varying traffic levels
54 Mbps data per channel
Uses different modulation schemes depending on type of data and error rates etc
802.16a approved as a standard on January 29, 2003, published on April 1, 2003

12. IEEE 802.16 Issues: LoS not feasible for residential applications
Significant multi path
Outdoor mounted antennas expensive

13. 802.16 Features LMDS in 10 - 66GHz band Point to Multipoint
Big block sizes
Air Interface designated “WirelessMAN-SC”
SC = Single Carrier Modulation
Usually QPSK 32 QAM
No OFD
Uplink Access by Time Division Multiple Access (TDMA)
Burst design allows both Time Division Duplex (TDD) and Frequency Division Duplex (FDD)

14. Roger Marks) The chairman of the 802.16a working group:(
IEEE a Features
802.16a approved as a standard on January 29, 2003, published on April 1, 2003
Roger Marks) The chairman of the a working group:(
The new IEEE a standard reshapes the broadband landscape. It closes the first-mile gap, giving users an easily installable, wire-free method to access core networks for multimedia applications

15. Error Control Encoding Error Control Decoding
PHY Block Diagram
Error Control Encoding
Data Source
OFDM Modulator
Wireless Channel
BER Tester
Error Control Decoding
Channel Estimator
Channel Equalizer
OFDM Demodulator

16. IEEE 802.16a Features Non-Line of Sight
6MHz bandwidth in GHZ band
10ms latency requirement
3 Modualtion schemes
WirelessMAN-SC2
Single Carrier modulation
WirelessMAN-OFDM
OFDM with 256-point FFT
TDMA access
WirelessMAN-OFDMA
OFDM with 2048-point FFT
Multiple carriers are assigned to multiple receivers to address multiple access

17. 802.16a – A Viable BWA Solution
2 – 11 GHz range, allows non LoS operation
Licensed and unlicensed spectrum
Key companies manufacturing a products: Soma Networks, IP Wireless, Flarion Technologies
Runcom’s RN-2234 System-On-a-Chip offers a cost effective solution for Customer Premises Equipment (CPE) manufacturers and Subscriber Unit (SU) modem developers of Broadband Wireless Access/MMDS applications. The modem chip complies with IEEE a standards and uses OFDMA technology to leverage broadband wireless communication in both downstream and upstream transmissions. Moreover, RN-2234 implements Physical (PHY) layer functions and includes analog modules to reduce the total cost of the Bill of Materials of the CPE/SU.

18. Some details about PHY Layer

19. 802.16a Technical Specifications
Data rates: 4-70 Mbps
Bandwidth: 10, 20, 25 MHz
Physical layer
Single carrier
OFDM with 256 point transform
OFDMA with 2048 point transform, multiple access
MAC: Point to multipoint and Mesh architectures supported
Runcom’s RN-2234 System-On-a-Chip offers a cost effective solution for Customer Premises Equipment (CPE) manufacturers and Subscriber Unit (SU) modem developers of Broadband Wireless Access/MMDS applications. The modem chip complies with IEEE a standards and uses OFDMA technology to leverage broadband wireless communication in both downstream and upstream transmissions. Moreover, RN-2234 implements Physical (PHY) layer functions and includes analog modules to reduce the total cost of the Bill of Materials of the CPE/SU.

20. OFDM Receiver

21. OFDM Modulation Schemes
256 point FFT
200 used (56 guard carriers)
8 pilot carriers (192 data carriers)
Sampling rate: 8/7 of the RF bandwidth
QPSK, 16-QAM and 64-QAM
Cyclic prefix length 1/4, 1/8, 1/16, 1/32 of the number of subcarriers

22. References
“Singapore Project DVB-RCT” Israel Koffmann – V.P. Marketing Runcom Technologies
Xilinx Solutions for Broadband Technologies
IEEE Presentation Submission Template (Rev. 8)
,Bob Heise
“IEEE Standard :A Technical Overview of the Wireless MAN™ Air Interface for Broadband Wireless Access” Carl Eklund, Nokia Research Center