L8 - WiMAX 1 Evolution of IEEE802.16 2 Aspects of Physical...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
SYSC 5403 - 8 Copyright © 1995-2009 by R.H.M. Hafez 1 WiMAX WiMAX 1. Evolution of IEEE802.16 2. Aspects of Physical layer 3. MAC layer 4. 802.16e vs. 802.16m 5. 802.20 SYSC 5403 - 8 Copyright © 1995-2009 by R.H.M. Hafez 2 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 Support for Mobile and Nomadic computing
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
SYSC 5403 - 8 Copyright © 1995-2009 by R.H.M. Hafez 3 IEEE802.16m (4G) IEEE802.16m (4G) 2005 2007 2009 2010 802.16f 802.16i 802.16J 802.16m MIB Fixed MMR Mobile Multi-Hop Relay MIB Mobile IMT-Advanced 4G MIB = Management Information Base SYSC 5403 - 8 Copyright © 1995-2009 by R.H.M. Hafez 4 Space Time Coding (optional) Space Time Coding (optional) 1. Two blocks of data are paired logically and are separated by a guard-time delay Block (0) Delay Block (1) Delay S0(n) -S1*(-n) S1(n) S0*(-n) Data is conjugated and time reversed time time Tx antenna 1 Tx antenna 2
Background image of page 2
SYSC 5403 - 8 Copyright © 1995-2009 by R.H.M. Hafez 5 STC (cont.)) STC (cont.)) Tx antenna 1 Tx antenna 2 Rx antenna H0 H1 2. Received signal during the first block is R0 and during the second block is R1 ) ( 0 N ) ( 1 S ) ( 1 H ) ( 0 S ) ( 0 H ) ( 0 R * ω + ω ω ω ω = ω ) ( 1 N ) ( 0 S ) ( 1 H ) ( 1 S ) ( 0 H ) ( 1 R * ω + ω ω + ω ω = ω 3. Assuming that the two channels are known, R0 and R1 can be optimally combined to obtain S0 and S1 SYSC 5403 - 8 Copyright © 1995-2009 by R.H.M. Hafez 6 OFDM OFDM – TDD Framing (example) TDD Framing (example)
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
SYSC 5403 - 8 Copyright © 1995-2009 by R.H.M. Hafez 7 Applying STC in OFDM Applying STC in OFDM Transmit Diversity Encoder IFFT Filter DAC RF Coding & Mod. Input Packing IFFT Filter DAC RF IFFT Filter DAC RF Diversity Comb Decode & de-mod. Decisions SYSC 5403 - 8 Copyright © 1995-2009 by R.H.M. Hafez 8 Physical Sub Physical Sub -Channels Channels FFT IFT 0 0 0 0 0 0 A/D x x x x x x RF Channel D/A 0 = Zero the input x = Ignore the output Transmitter A Receiver A carriers that are zeroed and ignored by the Tx/Rx “A” can be used “simultaneously” by other Tx/Rx pairs
Background image of page 4
SYSC 5403 - 8 Copyright © 1995-2009 by R.H.M. Hafez 9 Mapping Data in OFDMA Mapping Data in OFDMA 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 n n+1 n+2 n=3 n+4 n+5 n+6 n+7 n+8 n+9 n+10 n+11 n+24 n+25 n+26 n+27 n+28 n+29 n+30 n+31 n+32 n+33 n+34 n+35 n+12 n+13 n+14 n+15 n+16 n+17 n+18 n+19 n+20 n+21 n+22 n+23 Data Region One FEC code word k k+1 k+2 k+3 k+4 k+5 k+6 k+7 k+8 Time Frequency k+9 k+10 k+11 k+12 k+13 k+14 SYSC 5403 - 8 Copyright © 1995-2009 by R.H.M. Hafez 10 OFDMA Scheduling (Example) OFDMA Scheduling (Example) DL Frame Prefix 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 k k+1 k+2 k+3 k+4 k+5 k+6 k+7 k+8 k+9 k+10 k+11 k+12 k+13 k+14 UL-MAP DL Burst #3 DL Burst #1 DL Burst #2 DL burst #4 DL Burst #5 Preamble UL-Burst #1 UL-Burst #2 UL-Burst #3 Ranging DL-MAP DL TTG DL RTG Time New Cycle
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
SYSC 5403 - 8 Copyright © 1995-2009 by R.H.M. Hafez 11
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 21

L8 - WiMAX 1 Evolution of IEEE802.16 2 Aspects of Physical...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online