IEEE 802.16 (Wire less MAN) Name: Ehsan Rohani Master: Dr. S.M.Fakhraeii E-mail: e.rohani@ece.ut.ac.ir Figure Ref. http://www.ieee802.org/16/

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

Abstract Fixed Broadband Wireless Access (BWA) Why BWA? Fixed Broadband Wireless Channels Combining TDMA and FDMA TDMA operation FDMA operation IEEE 802.16 IEEE 802.16 Issues

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

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

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

TDMA operation

FDMA operation

Combining TDMA and FDMA TDMA + FDMA operation = OFDMA

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)

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

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

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)

Roger Marks) The chairman of the 802.16a working group:( IEEE 802.16a Features 802.16a approved as a standard on January 29, 2003, published on April 1, 2003 Roger Marks) The chairman of the 802.16a working group:( The new IEEE 802.16a 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

Error Control Encoding Error Control Decoding 802.16 PHY Block Diagram Error Control Encoding Data Source OFDM Modulator Wireless Channel BER Tester Error Control Decoding Channel Estimator Channel Equalizer OFDM Demodulator

IEEE 802.16a Features Non-Line of Sight 6MHz bandwidth in 2 - 11GHZ 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

802.16a – A Viable BWA Solution 2 – 11 GHz range, allows non LoS operation Licensed and unlicensed spectrum Key companies manufacturing 802.16a 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 802.16a 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.

Some details about PHY Layer

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 802.16a 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.

OFDM Receiver

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

References “Singapore Project DVB-RCT” Israel Koffmann – V.P. Marketing Runcom Technologies Xilinx Solutions for Broadband Technologies IEEE 802.16 Presentation Submission Template (Rev. 8) 2000-11-08 ,Bob Heise “IEEE Standard 802.16:A Technical Overview of the Wireless MAN™ Air Interface for Broadband Wireless Access” Carl Eklund, Nokia Research Center