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OFDM PHY Proposal May 2010 Date: Month Year

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Presentation on theme: "OFDM PHY Proposal May 2010 Date: Month Year"— Presentation transcript:

1 OFDM PHY Proposal May 2010 Date: 2010-05-01 Month Year
doc.: IEEE /xxxxr0 May 2010 OFDM PHY Proposal Date: Author(s): Name Company Address Phone Abu-Surra, Shadi Samsung Ban, Koichiro Toshiba Banerjea, Raja Marvell Basson, Gal Wilocity Blanksby, Andrew Broadcom Borges, Daniel Apple Borison, David Ralink Chang, Kapseok ETRI Chu, Liwen STMicroelectronics Chung, Hyun Kyu Coffey, Sean Realtek Cordeiro, Carlos Intel Dorsey, John Elboim, Yaron Fischer, Matthew Giraud, Claude NXP Golan, Ziv Gong, Michelle Grieve, David Agilent Carlos Cordeiro, Intel, et. al. VInko Erceg, Broadcom

2 May 2010 Month Year doc.: IEEE 802.11-07/xxxxr0 Author(s): Name
Company Address Phone Grodzinsky, Mark Wilocity Hansen, Christopher Broadcom Hart, Brian Cisco Hassan, Amer Microsoft Hong, Seung Eun ETRI Hosoya, Kenichi NEC Hosur, Srinath Texas Instruments Hsu, Alvin MediaTek Hsu, Julan Samsung Hung, Kun-Chien Jain, Avinash Qualcomm Jauh, Alan Jeon, Paul LGE Jin, Sunggeun Jones, VK Joseph, Stacy Beam Networks Jun, Haeyoung Kaaja, Harald Nokia Kafle, Padam Kakani, Naveen Kasher, Assaf Intel Kasslin, Mika Kim, Hodong Kim, Yongsun Kreifeldt, Rick Harman International Kwon, Edwin Kwon, Hyoungjin Kwon, Hyukchoon Laine, Tuomas Carlos Cordeiro, Intel, et. al. VInko Erceg, Broadcom

3 Nandagopalan, Saishankar
Month Year doc.: IEEE /xxxxr0 May 2010 Author(s): Name Company Address Phone Lakkis, Ismail Tensorcom Lee, Hoosung ETRI Lee, Keith AMD Lee, Wooyong Liu, Yong Marvell Lou, Hui-Ling Majkowski, Jakub Nokia Marin, Janne Maruhashi, Kenichi NEC Matsumoto, Taisuke Panasonic Meerson, Yury Wilocity Mese, Murat Broadcom Montag, Bruce Dell Myles, Andrew Cisco Nandagopalan, Saishankar Ngo, Chiu Samsung Nikula, Eero Park, DS Park, Minyoung Intel Pi, Zhouyue Ponnampalam, Vish MediaTek Prasad, Narayan Prat, Gideon Ramachandran, Kishore Raymond, Yu Zhan Ronkin, Roee Rozen, Ohad Sachdev, Devang NVIDIA Sadri, Ali Sampath, Hemanth Qualcomm Carlos Cordeiro, Intel, et. al. VInko Erceg, Broadcom

4 May 2010 Month Year doc.: IEEE 802.11-07/xxxxr0 Author(s): Name
Company Address Phone Sanderovich, Amichai Wilocity Sankaran, Sundar Atheros Scarpa, Vincenzo STMicroelectronics Seok, Yongho LGE Shao, Huai-Rong Samsung Shen, Ba-Zhong Broadcom Sim, Michael Panasonic Singh, Harkirat Soffer, Menashe Intel Song, Seungho SK Telecom Sorin, Simha Smith, Matt Stacey, Robert Sutskover, Ilan Taghavi, Hossain Qualcomm Takahashi, Kazuaki Trachewsky, Jason Self Trainin, Solomon Usuki, Naoshi Varshney, Prabodh Nokia Vertenten, Bart NXP Vlantis, George Wang, Chao-Chun MediaTek Wang, Homber TMC Wang, James Yee, James Yucek, Tevfik Yong, Su Khiong Marvell Zhang, Hongyuan Carlos Cordeiro, Intel, et. al. VInko Erceg, Broadcom

5 May 2010 Proposal overview This presentation is part and is in support of the complete proposal described in /432r0 (slides) and /433r0 (text) that: Supports data transmission rates up to 7 Gbps Supplements and extends the MAC and is backward compatible with the IEEE standard Enables both the low power and the high performance devices, guaranteeing interoperability and communication at gigabit rates Supports beamforming, enabling robust communication at distances beyond 10 meters Supports GCMP security and advanced power management Supports coexistence with other 60GHz systems Supports fast session transfer among 2.4GHz, 5GHz and 60GHz Vish Ponnampalam, Mediatek

6 OFDM PHY Characteristics
May 2010 OFDM PHY Characteristics Supports data rates up to ~7 Gbps Modulation formats: SQPSK, QPSK, 16-QAM and 64-QAM LDPC Coding: rates ½, 5/8, ¾ and 13/16 Designed to operate in NLOS environments Fixed Guard Interval (GI) of ~48 ns Coding tolerant to significant frequency selectivity Significant commonality with associated SC PHY Common preamble Common LDPC coding scheme etc

7 OFDM PHY MCS Table May 2010 MCS Index Modulation Code Rate NBPSC NCBPS
coded bits per OFDM symbol coded bits per subcarrrier Info bits per OFDM symbol MCS Index Modulation Code Rate NBPSC NCBPS NDBPS Data Rate (Mbps) 10 SQPSK 1/2 1 336 168 693.00 11 5/8 210 866.25 12 QPSK 2 672 13 420 14 3/4 504 15 16-QAM 4 1344 16 840 17 1008 18 13/16 1092 19 64-QAM 6 2016 1260 20 1512 21 1638

8 OFDM Parameters May 2010 Parameter Notation Value FFT Size NFFT 512
Number of data subcarriers NSD 336 Number of pilot subcarriers NSP 16 OFDM sampling frequency Fs 2640 MHz Subcarrier frequency spacing ΔF 5.16 MHz Guard Interval/Cyclic Prefix TGI 128/Fs= ~48ns

9 OFDM PPDU Format Preamble Header TRN-T/R Subfields (optional) May 2010
Consists of STF and CEF Duration of ~1.09 us Header carries 64 bits Includes 8-bit HCS and 8 reserved bits Fits into one OFDM symbol duration of ~ 242 ns TRN-T/R Subfields (optional) Used for beamforming training/tracking

10 May 2010 Preamble Format Ga128 and Gb128 are 128-length Golay complimentary sequence pairs sampled at SC chip rate Fs=1760 MHz (Tc = 1/Fs ~ 57 ns) Allows common pre-amble processing for OFDM and SC PHYs Short Training Field (STF) 15x repetition of Ga128 sequence Used for timing/frequency acquisition Channel Estimation Field (CEF) Consists of two 512-length complementary sequence pairs (GU512 and GV512) and a cyclic post-fix (GV128) Channel estimation in time or frequency domain Can auto-detect SC/OFDM PHY (different CEF formats employed)

11 Preamble Re-sampling Filter
May 2010 Preamble Re-sampling Filter OFDM preamble sequences are defined at SC chip rate (Fc) to support common SC/OFDM preamble processing 3/2-rate re-sampling is required to convert from Fc = 1760 MHz to (nominal) OFDM sampling rate (Fs = 2640 MHz) Re-sampling filter (73 taps) is specified so that Rx can undo filter response from channel estimate

12 Header Coding & Modulation
May 2010 Header Coding & Modulation Header contains 64 info bits which are heavily protected 168 parity bits generated by ¾ rate LDPC Info bits and parity repeated 3x Info bits not punctured Repetition of parity bits punctured differently Header mapped to OFDM symbol 8-bit check sequence included

13 Payload Coding & Modulation
May 2010 Payload Coding & Modulation Scrambling Data scrambled using 7-th order m-sequence Scrambler initialization sequence is tx-ed in the PHY header LDPC Encoding Zero padding to fit into OFDM symbols Parity bits generated Multiple code blocks are concatenated Modulation SQPSK: each code block is mapped to two OFDM symbols QPSK: each code clock is mapped to a single OFDM symbol 16-QAM: two code blocks are interleaved and mapped to a single OFDM symbol 64-QAM: three code blocks are interleaved and mapped to a single OFDM symbol

14 OFDM Tone Mapping (QPSK/SQPSK)
May 2010 OFDM Tone Mapping (QPSK/SQPSK) SQPSK QPSK Index P(k) is dependent on Dynamic/Static Tone Mapping (a) when Static Tone Mapping (STP) is used P(k) = k+168 (b) when Dynamic Tone Mapping (DTP) is used P(k) is derived from feedback

15 OFDM Tone Mapping (16-QAM/64-QAM)
May 2010 OFDM Tone Mapping (16-QAM/64-QAM) Only for 64-QAM For 16-QAM and 64-QAM, 2 and 3 code blocks are interleaved on a subcarrier basis, respectively.

16 Dynamic Tone Pairing for SQPSK and QPSK
May 2010 Dynamic Tone Pairing for SQPSK and QPSK First (NSD/2=168) half of data tones are sliced to NG (21 or 42 ) groups Each group consists of NTPG tones Second half of data tones are slices to NG groups Rx determines and feeds back pairings of groups l-th group of first half paired to GroupPairIndex(l)-th group of second half Tx/Rx use fixed mapping of tone-pairs used within pairs of groups

17 Conclusions OFDM PHY Mode has been proposed Main characteristics
Month Year doc.: IEEE /xxxxr0 May 2010 Conclusions OFDM PHY Mode has been proposed Part of complete proposal in /432r0 (slides) and /433r0 Main characteristics Significant commonality with SC Mode Proposal See IEEE ad-NT-8 Optimized for NLOS environment Provides up to 7 Gbps data rate Performance evaluation as per EVM document Presented in IEEE ad-CP-PHY Vish Ponnampalam, Mediatek VInko Erceg, Broadcom

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