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ECEN 5032 Data Networks Wireless PANs/MANs Peter Mathys mathys@colorado.edu University of Colorado, Boulder Data Networks, Wireless PANs/MANs, c 19962005, P . Mathys p.1/15 802.15 WPAN Overview Standard Modulation Method

SLIDE 1

ECEN 5032 Data Networks

Wireless PANs/MANs

Peter Mathys

mathys@colorado.edu

University of Colorado, Boulder

Data Networks, Wireless PANs/MANs, c

1996–2005, P

. Mathys – p.1/15

SLIDE 2

802.15 WPAN Overview

Standard Modulation Method Frequencies Data Rates (Mb/s) 802.15.1 GFSK+FHSS 2.4 GHz 1 802.15.3 QPSK,8-state TCM 2.4 GHz 11 DQPSK 2.4 GHz 22 16-QAM,8-state TCM 2.4 GHz 33 32-QAM,8-state TCM 2.4 GHz 44 64-QAM,8-state TCM 2.4 GHz 55 802.15.4 BPSK 0.9 GHz 0.02 BPSK 0.9 GHz 0.04 OQPSK 2.4 GHz 0.25

Data Networks, Wireless PANs/MANs, c

1996–2005, P

. Mathys – p.2/15

SLIDE 3

802.15.1 Error Control

There are 3 error correction schemes:

Rate 1/3 forward error correction (FEC). Uses simple repeat-3 code (used for headers). Rate 2/3 FEC. Uses shortened (15,10,4) Hamming code with generator polynomial

✂ ✄ ☎ ✁ ✂ ✆ ✝ ✄ ✁ ✂ ✞ ✆ ✂ ✆ ✝ ✄

. ARQ (automatic repeat request) scheme for data. Uses cyclic redundancy check (CRC) for error detection. Generator polynomial

✂ ✄ ☎ ✂ ✟✠ ✆ ✂ ✟✡ ✆ ✂ ☛ ✆ ✝

.

Packet header is always protected by rate 1/3 FEC. Other error control schemes are negotiated.

Data Networks, Wireless PANs/MANs, c

1996–2005, P

. Mathys – p.3/15

SLIDE 4

802.15.3 Signal Constellations

Data Networks, Wireless PANs/MANs, c

1996–2005, P

. Mathys – p.4/15

SLIDE 5

802.15.3 TCM

TCM: Trellis coded modulation.

Data Networks, Wireless PANs/MANs, c

1996–2005, P

. Mathys – p.5/15

SLIDE 6

802.11g PBCC

PBCC: Packet binary convolutional code. 256-state rate 2/3 code.

Data Networks, Wireless PANs/MANs, c

1996–2005, P

. Mathys – p.6/15

SLIDE 7

802.16 WiMAX Overview

Standard Modulation Method Frequencies Data Rates BW 802.16 QPSK, 16/64QAM 10-66 GHz 32-134 Mb/s 20-28 MHz 802.16a QPSK, 16/64QAM <11 GHz 75 Mb/s 20 MHz OFDM 256 subcarr 802.16e QPSK, 16/64QAM < 6 GHz 15 Mb/s 5 MHz OFDM 256 subcarr

Data Networks, Wireless PANs/MANs, c

1996–2005, P

. Mathys – p.7/15

SLIDE 8

802.16 Overview

Data Networks, Wireless PANs/MANs, c

1996–2005, P

. Mathys – p.8/15

SLIDE 9

Downlink PMD Sublayer

Data Networks, Wireless PANs/MANs, c

1996–2005, P

. Mathys – p.9/15

SLIDE 10

802.16 FEC Code Types

RS: Reed-Solomon (block) code. GF(

) (or GF(256)): Finite field made from binary 8-tuples. Turbo Code: Product of 2 codes that can be decoded iteratively using soft decisions.

Data Networks, Wireless PANs/MANs, c

1996–2005, P

. Mathys – p.10/15

SLIDE 11

802.16a Transmit Processing

Data Networks, Wireless PANs/MANs, c

1996–2005, P

. Mathys – p.11/15

SLIDE 12

802.16a FEC

✁✄✂

☎ ✆ ✝

error correcting RS Code over GF(
✁

):

✞ ✠✟ ✆ ✡ ✠✟ ☛✌☞ ✍ ✆ ✠✟ ☛✌☞ ✎ ✆✑✏ ✏ ✏ ✠✟ ☛✌☞ ✒ ✓✕✔ ✎ ✆

. GF(

) based on

✖ ✠✟ ✆ ✡ ✟ ✁ ☛ ✟ ✗ ☛ ✟ ✘ ☛ ✟ ✒ ☛ ✙

. Inner code is rate-compatible TCM code derived from a rate 1/2 constraint length K=7 (64-state), binary convolutional code.

Data Networks, Wireless PANs/MANs, c

1996–2005, P

. Mathys – p.12/15

SLIDE 13

802.16a Convolutional Code

Data Networks, Wireless PANs/MANs, c

1996–2005, P

. Mathys – p.13/15

SLIDE 14

802.16a Convolutional Code

Data Networks, Wireless PANs/MANs, c

1996–2005, P

. Mathys – p.14/15

SLIDE 15

802.16a Code Rates

Data Networks, Wireless PANs/MANs, c

1996–2005, P

. Mathys – p.15/15