wimax=updated

wimax=updated - WiMax Outline 1. What is WiMax? 2. The...

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© Copyright Roshdy H. M. Hafez 1990-2007 1 WiMax Outline 1. What is WiMax? 2. The History of 802.16 3. The MAC of WiMax © Copyright Roshdy H. M. Hafez 1990-2007 2 What is WiMax? z WiMax is an industrial forum that promotes deployments of “Broadband Wireless Networks” z It supports IEEE802.16 family of standards z Certify interoperability of products and technology z Global drive for acceptance of broadband wireless
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© Copyright Roshdy H. M. Hafez 1990-2007 3 IEEE802.16 Family 2001 2002 2003 2004 2005 802.16 802.16c 802.16a 802.16 REVd 802.16e 10 – 66 GHz Point-to-Point 2 – 11 GHz Point-to-Multi-Point Extension 10 – 66 GHz WiMax System profiles 2 – 66 GHz Revision of 802.16 and 802.16a Compatibility to “e” 2 – 6 GHz Mobile computing TDD / 5 MHZ MIMO (1x2) DL (46) /UL(11) 802.16 -2009 2 – 6 GHz TDD/FDD 20 MHz Various Enhancements 2009 802.16m TDD/FDD 5/10/20 & 40 DL (300) / UL (135) 2010 802.16j Multi-Hop & Relays © Copyright Roshdy H. M. Hafez 1990-2007 4 IEEE802.16 Bands Common Powerful MAC 10-66 GHz 10-66 GHz 2-11 GHz 2-11 GHz 3.5 GHz 3.5 GHz Licensed Unlicensed TDM TDMA Single Carrier HUMAN 5-6 GHz OFDM OFDMA OFDM OFDMA
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© Copyright Roshdy H. M. Hafez 1990-2007 5 Physical Layer 10-66 GHz 1. Line-of-sight is assumed 2. Single Carrier (SC) strategy 3. Burst mode only 4. Burst-by-burst adaptive coding/modulation 5. Three types of duplexing (TDD, FDD and FSDD) 6. Bandwidth management by time division © Copyright Roshdy H. M. Hafez 1990-2007 6 Duplexing Modes Single Frequency ¾ FDD = Frequency Division Multiplexing ¾ FSDD = Frequency Switched Division Multiplexing ¾ TDD = Time Division Multiplexing Three Three Modes Modes Two Frequencies / Full Duplex Two Frequencies Half Duplex
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© Copyright Roshdy H. M. Hafez 1990-2007 7 Frequency Division Multiplexing Broadcast Full Duplex First Half Duplex Second Half Duplex Frame Downlink Uplink © Copyright Roshdy H. M. Hafez 1990-2007 8 Framing
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wimax=updated - WiMax Outline 1. What is WiMax? 2. The...

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