04-0626r3

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Project IEEE P802.15 Working Group for Wireless
Personal Area Networks (WPANs) Submission Title
DS-UWB Proposal Update Date Submitted May
2005 Source Matt Welborn Company Freescale
Semiconductor, Inc Address 8133 Leesburg Pike,
Vienna VA 22182 Voice703-269-3000, FAX ,
E-Mail matt.welborn _at_ freescale.com Re
Response to Call for Proposals Abstract Pur
pose Provide technical information to the TG3a
voters regarding DS-UWB (Merger 2)
Proposal 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.
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Overview

• The DS-UWB proposal
• Proposal overview
• True UWB Scalability
• Higher data rates
• Higher power
• Lower rates longer ranges
• Your support for the TG3a standard

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Key Features of DS-UWB

• Based on true Ultra-wideband principles
• Large fractional bandwidth signals in two
  different bands
• Benefits from low fading due to wide bandwidth
  (gt1.5 GHz)
• Best relative performance at high data rates
• An excellent combination of high performance and
  low complexity for WPAN applications
• Support scalability to ultra-low power operation
  for short range very high rates using
  low-complexity implementations
• Performance exceeds the Selection Criteria in all
  aspect
• Better performance and lower power than any other
  proposal considered by TG3a
• Excellent basis for operation under gated UWB
  rules

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DS-UWB Operating Bands
Low Band
High Band
3
4
5
6
7
8
9
10
11
3
4
5
6
7
8
9
10
11
GHz
GHz

• Each piconet operates in one of two bands
• Low band (below U-NII, 3.1 to 4.9 GHz) Required
  to implement
• High band (optional, above U-NII, 6.2 to 9.7 GHz)
  Optional
• Different personalities propagation
  bandwidth
• Both have 50 fractional bandwidth
• Each band supports up to 6 different piconets

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Data Rates Supported by DS-UWB
(Similar Modes defined for high band up to 2
Gbps)
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Range for 110 and 220 Mbps
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Range for 500 and 660 Mbps

• This result if for code length 1, rate ½ k6
  FEC
• Additional simulation details and results in
  15-04-483-r5

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DS-UWB The Best Solution

• We have presented a proposal superior to any
  others considered by TG3a
• Lower complexity
• Higher performance
• Satisfies all 15.3a applications requirements to
  1 Gbps
• Scalable to other application spaces and
  regulatory requirements
• Multi-Gbps for uncompressed video/transfer
  applications
• Low rate/low complexity applications many
  DS-type approaches are under consideration by
  TG4a
• Compliant with all established regulations
  proposed regulations
• Lowest interference effects for other systems
• OOB emissions well below any proposed limits
• Capability to support other regulatory
  restrictions

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Scalability

• Higher data rates
• Longer ranges higher capacity
• Low power consumption

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Performance at High Rates (1 Gbps)

• DS-UWB has multiple modes (with FEC) supporting
  1 Gbps (2 bands)
• Simulations in different AWGN and multipath
  channel conditions
• This is the only proposal considered by TG3a that
  has demonstrated the capability to satisfy this 1
  Gbps requirement from the SG3a CFAs TG3a
  Requirements Document
• No MIMO or higher order modulation (e.g. 16-QAM)
  is required

Environment Range Criteria
AWGN 5.3 m Mean
Low band CM1 1.7 m 85 Outage
Low band CM1 2.7 m 90 Mean
Low band CM 6 (3 ns RMS delay spread) 2.2 m 3.3 m 90 Outage 90 Mean
High band CM1 2 m 90 Outage
High band CM2 1 m 90 Outage
CM 6 is a modification of CM1 with 3 ns RMS
delay spread details in doc 05/051r1
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The Advantages of Higher Data Rates

• The new provisions for gated UWB systems create
  an even greater advantage for high rate systems
• Before, only applications that needed highest
  rates at short range were affected by
  effectiveness of high rate modes
• High speed file transfer, uncompressed video,
  etc.
• Now, every application can be improved through
  the use of efficient high rate modes
• Those requiring longer ranges operate at lower
  duty cycle and send the same data in less time
• As UWB technology matures, systems will be
  designed to transfer data at highest supported
  data rates
• Maximizes network capacity for supporting more
  applications
• No transmit power penalty range trade-off is
  completely changed
• Technologies that do not scale will be left
  behind or will be limited in their ability to
  provide the performance

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Gated UWB will Change UWB Trade-Offs

• Represents a change in fundamental UWB system
  design trade-offs
• Significant incentive for designers to use lower
  duty cycle to increase transmit power
• Increases network capacity for free
• Requires scaling to higher data rates to enable
  low duty cycle
• All waveforms do not benefit equally from the
  gated UWB provisions
• Requires scaling to higher data rates without
  loss of efficiency or performance
• Any waveform that already has high peak
  requirements could preclude efficient operation
  as a gated UWB system
• DS-UWB is ideally suited to support gated UWB
  operation and benefit from the many system-level
  advantages it can provide

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Key System Level Issue Scalability

• Scalability to higher data rates and higher
  transmit power is essential to realize the
  benefits of low duty cycle operation
• This is the Sweet Spot for gated UWB
  performance
• Allows increased network capacity
• Like creating free additional spectrum
• Support more applications with little impact to
  network
• Without sacrificing power efficiency
• Higher Eb/No requirements preclude benefits of
  gating
• Ultimate scalability depends on instantaneous
  signal bandwidth

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Gating Analysis

• Decrease duty cycle and increase power
• Simple model assumptions
• N devices using equal data rates at equal range,
  RApp
• Network capacity Number of devices x
  Application rate DNet N x DApp
• Devices have maximum data rate DMax
• Path loss scales as 1/Rn, assume n2 to 3
• Questions
• How can we increase network capacity range?
• How can we reduce device power consumption?

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Shared Duty Cycle Operation for UWB Applications
-41.25 dBm/MHz RMS over 1ms Power limit
10 dB
6 dB
TV App1
TV Application 1
TV Application 1
1 ms Integration Time

• New regulations for gating provide system
  flexibility
• Multiple ways to send same data over same range
• Each has same total energy emitted into the air,
  but
• Higher data rates allow more total network
  capacity
• Also enables lower power solution for handheld
  applications
• Gated operation can deliver lower overall power
  consumption

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Effects of Packet Overhead

• Packet networks have fixed overhead that impacts
  scaling as data rate increases
• Preamble headers
• As rate increases with gating, duty cycle (DC)
  decrease is limited by fixed overhead
• DC100 (TOH TData)/TAve
• DC200 (TOH ½TData)/TAve

TOH
TData
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Increasing Application Range Performance

• Requirement support N devices at DApp
• Question How much can gating increase the range?
• Assumptions
• Operate each device at rate of DDev N x DApp _at_
  range RD
• Gating at lt 1 ms allows Tx power increase
• Data duty cycle, DC DApp/DDev 1/N, so power
  increases N times
• Range increases beyond RD

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Range Performance Increases with Gating Systems
Range Performance with Gating using 15 dB Peak
Margin
Device Rate (Mbps)
Range Performance Increase
Application Data Rate (Mbps)
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Range Performance Increases with Gating Systems
Including 15 usec Packet Overhead
Range Performance with Gating using 15 dB Peak
Margin
Device Rate (Mbps)
Range Performance Increase
Application Data Rate (Mbps)
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Range Performance Increases with Gating Systems
Range Performance with Gating using 6 dB Peak
Margin
Device Rate (Mbps)
Range Performance Increase
Application Data Rate (Mbps)
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Conclusion on Range Performance

• Model of fixed bit rate (1-100 Mbps) matches
  many applications
• Steaming multimedia, file transfer, etc.
• Performance increases are significant with
  gating, as high as 3-5 times greater range
• Depends on path loss exponent
• Depends on peak power margin
• Depends on ability to scale to higher rates
• Not impacted significantly by fixed packet
  overhead for most applications

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How a Fast Radio Saves Power forMobile Devices

• The UWB radio is turned on off to transfer
  packets of data
• On time is a function of data rate
• Radio sleeps during data transfer to/from handset
  memory
• Total energy consumed from battery is the area
  under the curve

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Conclusions Your Support

• DS-UWB technology provides the best design for
  TG3a to be a successful standard
• The recent ruling to allow gating has
  fundamentally changed the UWB landscape
• DS-UWB is uniquely situated to benefit
• We invite your support for DS-UWB during the
  confirmation vote on Wednesday