ECEN 5032 Data Networks Wireless PANs/MANs Peter Mathys - PowerPoint PPT Presentation

� 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

� 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

☛ ✄ ✝ ✄ � ✝ � ✁ ✂ ☎ ✆ ✂ ✟✠ ✆ ✂ ✟✡ ✆ ✂ ✆ ✂ ✆ ✂ � ✁ ✂ ✄ ☎ ✞ ✁ ✆ ✝ ✄ ✁ ✂ 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

� 802.15.3 Signal Constellations Data Networks, Wireless PANs/MANs, c 1996–2005, P . Mathys – p.4/15

� 802.15.3 TCM TCM: Trellis coded modulation. Data Networks, Wireless PANs/MANs, c 1996–2005, P . Mathys – p.5/15

� 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

� 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

� 802.16 Overview Data Networks, Wireless PANs/MANs, c 1996–2005, P . Mathys – p.8/15

� Downlink PMD Sublayer Data Networks, Wireless PANs/MANs, c 1996–2005, P . Mathys – p.9/15

� ✁ � 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

� 802.16a Transmit Processing Data Networks, Wireless PANs/MANs, c 1996–2005, P . Mathys – p.11/15

✟ ✖ ✒ ✎ ✆ � ✒ � ✁ ✟ ☛ ✘ ✆ ✡ ✟ ✁ ☛ ✟ ✗ ☛ ☛ ✏ ✏ ✡ ☎ ✆ ✝ � ✁ ✞ ✆ � ✍ ✆ ✙ ✎ 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

� 802.16a Convolutional Code Data Networks, Wireless PANs/MANs, c 1996–2005, P . Mathys – p.13/15

� 802.16a Convolutional Code Data Networks, Wireless PANs/MANs, c 1996–2005, P . Mathys – p.14/15

� 802.16a Code Rates Data Networks, Wireless PANs/MANs, c 1996–2005, P . Mathys – p.15/15