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MultiBand OFDM Overview

This presentation provides an overview of the MultiBand OFDM proposal, including technical advantages, key supporters, and references to supporting materials.

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MultiBand OFDM Overview

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [MultiBand OFDM Overview] Date Submitted: [ 19 January, 2005] Source: [Matthew B. Shoemake] Company [WiQuest Communications, Inc.] Address [601 Century Parkway, Suite 110, Allen, Texas, USA 75013] Voice:[+1 214-547-1600], FAX: [+1 214-547-1606], E-Mail:[Matthew.Shoemake@WiQuest.com] Re: [MultiBand OFDM Proposal, doc. 15-04-493r1] Abstract: [This presentation provides an overview of the MultiBand OFDM proposal. Details of the actual proposal may be found in document 15-04-493r1. This presentation provides high level technical details of the MultiBand OFDM proposal. It attempts to communicate what MultiBand OFDM is, why key technical decision were made, how the solution functions and who key supporters of the proposal are.] Purpose: [To inform voters of the merits of MultiBand OFDM thereby allowing them to make an informed vote in the IEEE 802.15.3a technical selection procedure.] Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. Matthew B. Shoemake, WiQuest

  2. Introduction • The purpose of this document is to provide an overview of MultiBand OFDM (doc. 15-04-0493r1) including • Technical advantages and characteristics • Identification of key supporters • References to supporting material Matthew B. Shoemake, WiQuest

  3. Proposal Overview • The MultiBand OFDM proposal: • Is based on proven OFDM technology • Used in IEEE 802.11a and 802.11g • Achieves data rates of 53 to 480 Mbps • Support for 4 to 16 simultaneous piconets • Spectrum easily sculpted for international regulatory domain compliance • Is easily extensible for future range/rate improvements Matthew B. Shoemake, WiQuest

  4. Frame Format • PLCP Preamble • Deterministic sequence • Allows packet detect and piconet identification • PLCP Header • Encoded at 53 Mbps • Contains reserved bits for future extensions • Payload • Coded at 53 to 480 Mbps • Each frame contains multiple OFDM symbols PHY Tail MAC Tail Pad Frame Payload Tail Pad PLCP Preamble HCS FCS - Header Bits Header Bits Bits Variable Length: 0 4095 bytes Bits Bits PLCP Header 53.3*, 80, 110*, 160, 200*, 320, 400, 480 Mb/s 53.3 Mb/s * - Mandatory Rates Matthew B. Shoemake, WiQuest

  5. NULL 0 0 1 1 # 1 2 2 # 2 61 61 # 61 NULL 62 62 Frequency-Domain Inputs NULL 63 63 Time-Domain Outputs NULL 64 64 NULL 65 65 66 66 NULL - # 61 67 67 -2 # 126 126 - # 1 127 127 Output Data A D D D D D D Output Data B Output Data C Encoder Puncturer 64-State BCC Scrambler 3-Stage Interleaver QPSK Mapper IFFT DAC Time Frequency Kernel • Error Control Coding • Standard 64-State Binary Convolutional Code • Punctured to achieve various data rates • IFFT • 128 points • 100 data, 12 pilot, 10 guard, 6 null Matthew B. Shoemake, WiQuest

  6. Packet at Baseband • Each OFDM symbol is 312.5 ns long containing: • - 60.6 ns null cyclic prefix • - 242.4 ns of data transmission • - 9.5 ns guard • Number of OFDM Symbols: • - Packet sync: 21 • - Frame sync: 3 • - Channel estimation: 6 • - PLCP header: 12 • - Payload: Variable (54 at left) Matthew B. Shoemake, WiQuest

  7. Spectrum DAC converter rate = 528 MHz Tone width = 4.125 MHz Instantaneous Bandwidth ≈ 123 * 4.125 MHz = 511 MHz As characteristic of OFDM systems, signal rolloff is sharp yielding excellent adjacent channel interference characteristics Matthew B. Shoemake, WiQuest

  8. Band Band Band #1 #2 #3 3432 3960 4488 f MHz MHz MHz Band Groups • Spectrum is divided into 14 bands • Bands are spaced at 528 MHz • Five band groups are defined • Enables structured expansion • Each Time Frequency Code (TFC) corresponds to a Logic Channel • Logical Channels enable Simultaneously Operating Piconets (SOPS) • Four SOPS are enabled on Band Group1 Matthew B. Shoemake, WiQuest

  9. AWGN Performance Noise Bandwidth ≈ 500 MHz Noise Floor ≈ -87 dBm Matthew B. Shoemake, WiQuest

  10. Features • Regulatory • Meets FCC requirement for 500 MHz minimum bandwidth • Maximally flexible for regulatory expansion due spectral sculpting capability • Robustness • Time Frequency Coding provides frequency diversity gain and robustness to interference Matthew B. Shoemake, WiQuest

  11. System Performance (3-band) • The distance at which the Multi-band OFDM system can achieve a PER of 8% for a 90% link success probability is tabulated below: • Includes losses due to front-end filtering, clipping at the DAC, ADC degradation, multi-path degradation, channel estimation, carrier tracking, packet acquisition, no attenuation on the guard tones, etc. Matthew B. Shoemake, WiQuest

  12. PHY-SAP Throughput • Assumptions: • MPDU (MAC frame body + FCS) length is 1024 bytes. • SIFS = 10 ms. • MIFS = 2 ms. • Assumptions: • MPDU (MAC frame body + FCS) length is 4024 bytes. Matthew B. Shoemake, WiQuest

  13. MB-OFDM Support • MultiBand OFDM has an unprecedented level of support and serves the needs of: • Major PersonalComputer manufacturers • Major MobilePhone manufacturers • Major ConsumerElectronics manufacturers • Major Software companies • Component manufacturers • Test equipment manufacturers Matthew B. Shoemake, WiQuest

  14. MB-OFDM Advantages Matthew B. Shoemake, WiQuest

  15. Summary • Inherent Multipath Capture and Immunity • High Performance Error Control • Range/rate extendable • Spectral Sculpting for Global Expandability • Superior channelization • Low Cost and Power Consumption Matthew B. Shoemake, WiQuest

  16. Backup Matthew B. Shoemake, WiQuest

  17. Signal Robustness/Coexistence • Assumption: Received signal is 6 dB above sensitivity. • Values listed below are the required distance or power level needed to obtain a PER  8% for a 1024 byte packet at 110 Mb/s and operating in Band Group #1. • Coexistence with IEEE 802.11b and Bluetooth is relatively straightforward because they are out-of-band. • Multi-band OFDM is also coexistence friendly with both GSM and WCDMA. • MB-OFDM has the ability to tightly control OOB emissions. Matthew B. Shoemake, WiQuest

  18. PHY Complexity • Unit manufacturing cost (selected information): • Process: CMOS 90 nm technology node in 2005. • CMOS 90 nm production will be available from all major SC foundries by early 2004. • Die size for the PHY (RF+baseband) operating in Band Group #1: • Active CMOS power consumption for the PHY (RF+baseband) operating in Band Group #1 : * Analog Component area. Matthew B. Shoemake, WiQuest

  19. Select References 15-03-0343, MultiBand OFDM September 2003 presentation, Anuj Batra 15-03-0449, MultiBand OFDM Physical Layer Presentation, Roberto Aiello and Anand Dabak 15-04-0010, MultiBand OFDM January 2004 Presentation, Roberto Aiello, Gadi Shor and Naiel Askar 15-04-0013, C-Band Satellite Interference Measurements TDK RF Test Range, Evan Green, Gerald Rogerson and Bud Nation 15-04-0017, Coexistence MultiBand OFDM and IEEE 802.11a Interference Measurements, Dave Magee, Mike DiRenzo, Jaiganesh Balakrishnan, Anuj Batra 15-04-0018, Video of MB-OFDM, DS-UWB and AWGN Interference Test, Pat Carson and Evan Green Matthew B. Shoemake, WiQuest

  20. Additional References (1 of 2) • MB-OFDM Update and Overview, Matthew B. Shoemake (WiQuest), doc. 15-04-0518 • MB-OFDM Specification, Anuj Batra (Texas Instruments), et al., doc. 15-04-493 • Market Needs for a High-Speed WPAN Specification, Robert Huang (Sony) and Mark Fidler (Hewlett Packard), doc. 15-04-0410 • MB-OFDM for Mobile Handhelds, Pekka A. Ranta (Nokia), doc. 15-04-432 • In-band Interference Properties of MB-OFDM, Charles Razzell (Philips), doc. 15-04-0412 Matthew B. Shoemake, WiQuest

  21. Additional References (2 of 2) • Spectral Sculpting and Future-Ready UWB, David Leeper (Intel), Hirohisa Yamaguchi (TI), et al., doc. 15-04-0425 • CCA Algorithm Proposal for MB-OFDM, Charles Razzell, doc. 15-04-0413 • What is Fundamental?, Anuj Batra, et al., doc. 15-04-533 • Time to market for MB-OFDM, Roberto Aiello (Staccato), Eric Broockman (Alereon) and David Yaish (Wisair), doc. 15-04-432 Matthew B. Shoemake, WiQuest

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