Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

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• Project IEEE P802.15 Working Group for Wireless
  Personal Area Networks (WPANs)
• Submission Title Sony CFP Presentation
• Date Submitted 3 March 2003
• Source Etsumi Fujita, Katsumi Watanabe,
  Katsuyuki Tanaka, Bob Huang
• Mitsuhiro Suzuki, Shin Saito, Jun
  Iwasaki
• Company Sony Corporation
  
  Sony Electronics of America
• Address 6-7-35 Kitashinagawa
  Shinagawa-ku,Tokyo. Japan 141-0001 One Sony Drive
  TA-1
• Voice 81-3-6409-3201, FAX [phone]
  Park Ridge, NJ 07656
• E-Mail fujita_at_wcs.sony.co.jp,
  KatsumiA.Watanabe_at_jp.sony.com, V
  201-358-4409
• Katsuyuki.Tanaka_at_jp.sony.com,
  suzuki_at_wcs.sony.co.jp, F
  201-930-6397
• shin_saito_at_sm.sony.co.jp,
  junjun_at_wcs.sony.co.jp EMail
  robert.huang_at_am.sony.com
• Re 02/372r8 of 17 January 2003, 03/138r0 Sony
  CFP Document of 3 March 2003
• Abstract This presentation provides detailed
  information on a unique UWB proposal.
• Purpose This material is submitted to support a
  unique UWB 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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Our Proposal

• Meets or exceeds all criteria and
• Excels in fast acquisition unique method
• Performs continuous channel estimation
• Has low complexity/low gate count
• Has high system capacity
• Scalability to 3 Gbps

at maximum range
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Our proposal Excels
Criteria P.R.
Size and form factor
Payload bit rate
PHY-SAP throughput
Simultaneous operating piconets
Signal acquisition
Link Budget
Sensitivity
Multi-path immunity
Power management modes
Power consumption
Antenna practicality
Proposer Response
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Our Motivation

• We think UWB is
• Precious frequency band we will never get again
  in the future
• Carrying an extremely high bit rate

• Therefore, we want
• To provide big convenience to our customers
  (consumers)
• To put our best effort and technologies into this
• To achieve effective usage of the frequency
  resource

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What we expect from UWB

• UWB can provide
• Greater than 1 Gbps by wireless
• Simple RF and modulation system
• Low power consumption and low cost

• UWB can connect all of CE devices and realize a
  Wireless Broadband Home and Personal Network!!

all of CE devices
Wireless Broadband Home and Personal Network!!
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Connecting Our World
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Summary of Characteristics
Modulation scheme DS-SS p/2 shift BPSK (uses a carrier)
Band division 3 channels within FCC Mask (Center freq. 4, 7, and 9 GHz)
Channel bandwidth 1.8 GHz
Transmit power -11 dBm/ch.
Max. payload bit rate 1.0 Gbps/ch.
Receiver sensitivity -82.7 dBm _at_ 115 Mbps
Power consumption (per channel) 10mw (sleep mode) 50mW _at_ 115 Mbps (Tx mode) 150mW _at_ 115 Mbps (Rx mode)
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System Configuration

• Proven architecture
• Known implementations
• Understood cost
• Low implementation risk

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Why DS-SS?

• We considered non-DS-SS approaches
• Especially to combat severe multipath effects
• But, DS-SS has advantages in
• Simple RF implementation
• Energy collection with rake receiver

Problem How to improve DS-SS performance
in severe multipath conditions?
Simple!! By fast and accurate channel
estimation!!
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The 3 Channel System
5 GHz
FCC Spectrum Mask -41.3 dBm/MHz
W-LAN
Power
Spectrum
4
5
6
8
9
10
11
3
2
7
1
Freq GHz
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Why use 3 Channels?

• Multiple channels eases co-existence with
• Other radio systems (e.g., 802.11a)
• Between 15.3a networks

• Provides implementation
• Ease in lower channel
• Scalability to high bit rates in upper channels

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Why use 1.8 GHz Bandwidth channels?

• Given FCC power density limit 41.3 dBm/MHz
• Transmit the most energy
• Recover the most energy
• A wideband channel provides
• Greatest throughput / range / robustness

Greatest throughput / range / robustness
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Why a Single Carrier System?

• A Single Carrier
• Transmits high energy
• Power spectral density is more uniform
• No guard bands in which energy is lost
• 80 µW TX Power ( -11 dBm)
• Recovers max energy
• Single channel optimization easier

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Outstanding Features

• Fast acquisition
• Fast channel estimation for every packet
• Maximizes utilization of frequency spectrum
• Simple RF configuration
• no RF rake, no Tx RF pulse shaping filter
• Multipath immunity
• Fits FCC mask with low complexity
• Co-exists with current wireless systems
• Low cost full CMOS implementation

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Fast Acquisition and Channel Measurement

• Why?
• Needed for high throughput and robustness
• Our technique
• Fast compared to conventional sliding correlation
  method.
• Performs a coherent channel measurement
• Accurately measures delay profile
• Allows short preamble
• Detect precise chip-phase from measurement results

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Fast Channel Measurement

• Chip-rate is generated by dividing the carrier
  frequency by 4
• Measurement Resolution 250 ps
• Once carrier frequency is tracked, the chip-rate
  tracking is available
• Chip and carrier are synchronized
• Only one tracking loop
• Fast and low cost

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Fast Coherent Channel Measurement

• Gives fast Link Adaptation
• Burst by burst
• Goes from 46 Mbps to 1000 Mbps by changing coding
  rate
• Maximizes
• Throughput
• Utilization of frequency spectrum

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Simple RF Configuration

• No RF pulse shaping filter
• Uses waveform shaping to fit FCC mask
• Lower cost, Less complex, No filter loss
• Single RF chain (min. 4 finger baseband rake)
• DS-SS
• Well understood
• Proven implementations
• Proven performance

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Multipath immunity

• Provided using a baseband rake receiver
• A accurate channel measurement results in good
  rake performance
• Continuous channel measurement good for changing
  multipath environment
• Measure channel for every packet

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Fits FCC mask with low complexity

• Well known and proven DS-SS technique used to
  shape spectral output to FCC fit mask

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p/2 Shift BPSK

• 500 Mpulse/s on I axis
• 500 Mpulse/s on Q axis
• I Q are multiplexed with timing offset

no pulse overlap
To

• Maximize pulse rate
• Minimize inter-pulse interference

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Comparison of Modulation
Q
Q
Q
I
I
I
I-ch modulation
Q-ch modulation
Constellation

• The result is
• Constant Envelope
• Good pulse shaping

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Co-existence With Other Systems

• Channelization
• By-passes 5 GHz WLAN band
• Can be changed to meet different regulatory
  requirements

Bandpass Filter
s

• Receive uses
• Bandpass filter
• Low pass filter

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Working with Uncoordinated Piconets

• Separate piconets using different
• Spreading gain
• Physical channels

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Antenna practicality

• This solution uses a omni directional antenna
  with a reasonably flat frequency response
• We understand that suitable low cost antennas
  will be available
• Therefore the antenna will not be a unique
  element that needs to be standardized for
  interoperability
• Simple low cost antennas will work!

antenna
unique
element
interoperability
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Time to Market
Estimated timeline
2Q 2005 2 Chip solution PC Card compatible
4Q 2005 Single chip Removable / Portable Memory format
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Other Design Points

• High capacity
• Low power consumption
• High robustness and range
• Low cost
• Regulatory rules

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Design point High Capacity

• High bandwidth channelization
• High capacity channels
• Fast acquisition (short preamble)
• Accurate and fast channel estimation
• Baseband rake receiver to capture maximum energy

• Simple, Low cost, Expandable

• Simple, Low cost, Expandable

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Design point Robustness

• Coding details
• Reed Solomon code up to 1 Gbps
• Convolution code up to 125 Mbps

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Design point Robustness

• Fast Link Adaptation used to dynamically select
• The spreading factor
• The coding scheme
• Under Good Channel Conditions
• Decrease spreading factor for greater throughput
  
• Omit coding for power saving
• Under Bad Channel Conditions
• Increase spreading factor for greater robustness
  
• Increase coding to increase link margin

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Design point Power Saving Mechanism

• Supports modes defined in the proposed 802.15.3
  standard
• ACTIVE, HIBERNATE, PSPS (Piconet synchronized
  power save), and SPS (Synchronous power save)

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Design point Ranging

• Range between devices is calculated from the
  measured round trip delay

250ps

• 7.5 cm Precision

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Design point Low Complexity/Low Cost

• Easy RF implementation for one chip full CMOS
  solution
• Design avoids high amplitude Pulses
• Uses well known DS-SS modulation
• Relax linearity for on-chip PA
• Single chain RF
• Simple configuration
• Uses baseband rake
• No Tx RF pulse shaping filter

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Design point Low Complexity/Low Cost

• Unit manufacturing cost/complexity (UMC)
• Analog die size 56mm2 (CMOS 0.18um)
• including VCO, PLL, Modulator, Pulse shaper,
  LNA, Power Amp., AGC, LPF, RF switch, Complex
  mixer, ADC
• Digital (without MAC) Gate count lt 300k gate
• including SS modulator/demodulator, RAKE,
  Encoder/Decoder, PHY header mux/demux
• Major external components
• TCXO, receive BPF, voltage regulator, decoupling
  capacitor/inductor, connectors

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Issue Low Power consumption

• Low complexity, single chain RF
• Low voltage CMOS implementation
• Reduced linearity requirements for PA

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Outstanding Features

• Fast acquisition
• Fast channel estimation for every packet
• Maximizes utilization of frequency spectrum
• Simple RF configuration
• no RF rake, no Tx RF pulse shaping filter
• Multipath immunity
• Fits FCC mask with low complexity
• Co-exists with current wireless systems
• Low cost full CMOS implementation