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May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 1
doc.: IEEE 802.15-03/097r2
Submission
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)(WPANs)
Submission Title: [CRL Consortium’s Soft-Spectrum proposal for IEEE 802.15.3a]Date Submitted: [5 May, 2003]Source: [Ryuji Kohno, Honggang Zhang, Hiroyo Ogawa] Company [(1) Yokohama National University, (2) Communications Research Laboratory, (3) Communications Research Laboratory ]Connector’s Address [3-4, Hikarino-oka, Yokosuka, 239-0847, Japan]Voice:[+81-468-47-5101], FAX: [+81-468-47-5431],E-Mail:[ kohno@crl.go.jp, honggang@crl.go.jp, hogawa@crl.go.jp]Re: [IEEE P802.15 Alternative PHY Call For Proposals, IEEE P802.15-02/327r7]Abstract: [Soft-Spectrum UWB transferring schemes with free-verse and geometric pulse waveform adaptation and shaping are proposed, which are suitable for co-existence, interference avoidance, matching with regulatory spectral mask, and high data rate. Our proposed Soft-Spectrum Adaptation (SSA) is able to be introduced in either single-band or mutiband implementations. Local sine template receiving scheme is also investigated for Soft-Spectrum UWB impulse radio.]
Purpose: [For investigating the characteristics of High Rate Alternative PHY standard in 802.15TG3a, based on Soft-Spectrum adaptation, pulse waveform shaping and local sine template receiving]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.
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 2
doc.: IEEE 802.15-03/097r2
Submission
CRL Consortium’s Soft-Spectrum Proposal for IEEE 802.15.3a
Ryuji KOHNO Honggang ZHANG , Hiroyo OGAWA
Communications Research Laboratory (CRL)
and CRL-UWB Consortium
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 3
doc.: IEEE 802.15-03/097r2
Submission
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 4
doc.: IEEE 802.15-03/097r2
Submission
Members of CRL Consortium
Tasuku TESHIROGI Anritsu CorporationCASIO Computer Co., Ltd. Hideaki ISHIDA
Advantest CorporationTakahiro YAMAGUCHI
Tetsuya YASUI Communications Research Laboratory
Fuji Electric Co., Ltd.Tomohiro INAYAMA
Toshiaki MATSUI Communications Research Laboratory
Fujitsu LimitedToshiaki SAKANEFurukawa Electric Co., Ltd.Youichi ISO
Hitachi Kokusai Electric Inc.Masatoshi TAKADAYoshinori OHKAWA Hitachi Cable, Ltd.
Akifumi KASAMATSU Communications Research Laboratory
Hiroyo OGAWA Communications Research Laboratory
Honggang ZHANG Communications Research Laboratory
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 5
doc.: IEEE 802.15-03/097r2
Submission
Members of CRL Consortium (cont)
SANYO Electric Co., Ltd.Sumio HANAFUSA
Eishin NAKAGAWA Telecom Engineering Center
Oki Electric Industry Co., Ltd.Yoshihito SHIMAZAKIOki Network LSI CO., Ltd.Masami HAGIO
Makoto YOSHIKAWA NTT Advanced Technology CorporationNEC Engineering, Ltd.Yoshiaki KURAISHI
Tetsushi IKEGAMI Meiji University
Takehiko KOBAYASHI Tokyo Denki UniversityKiyomichi ARAKI Tokyo Institute of TechnologyJun-ichi TAKADA Tokyo Institute of Technology
Samsung Yokohama Research InstituteHiroyuki NAGASAKA
Omron CorporationToru YOKOYAMA
Matsushita Electric Works, Ltd.Satoshi SUGINO
Ryuji KOHNO Yokohama National University
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 6
doc.: IEEE 802.15-03/097r2
Submission
Outline of PresentationWhy Soft-Spectrum UWB for IEEE 802.15.3a WPANsSoft-Spectrum UWB PHY system architectureLink budget and supported data ratesMultiple access techniques and performanceCoexistence and narrowband interference mitigationMultipath mitigation techniques and performance Implementation feasibilitySummaryBackup materials
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 7
doc.: IEEE 802.15-03/097r2
Submission
Why Soft-Spectrum UWB for IEEE 802.15.3a WPANs?
Philosophy of Soft-Spectrum Adaptation (SSA) with flexible pulse waveform and frequency band design free-verse pulse waveform shaping geometrical pulse waveform shaping Interference avoidance and co-existence for harmonized, global implementation SSA can flexibly adjust UWB signal spectrum so as to match with spectral restriction in transmission power, i.e. spectrum masks in both cases of single and multiple bands. Scalable, adaptive performance improvement Smooth system version-up similar to Software Defined Radio
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 8
doc.: IEEE 802.15-03/097r2
Submission
What’s the solution?(I) Pulse domain (II) Spectrum domain
Considering the whole frequency bands from DC to 15 GHz, in regard of the FCC Spectrum Mask
The maximum emission power is limited to –80dBm/MHz (whole bands) Frequency efficiency is extremely worse
What we want to do ? Giving spectrum freedom Flexible spectrum design Giving waveform freedom Flexible pulse waveform design Giving system freedom Maintaining exchangeability with existing and coming UWB systems
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 9
doc.: IEEE 802.15-03/097r2
Submission
Basic philosophy Soft-Spectrum Adaptation
Soft-Spectrum Adaptation
Pulse design corresponding to required bandwidths Flexible and adaptive spectrum , even if regional
spectral mask is changed
m1
0
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 10
doc.: IEEE 802.15-03/097r2
Submission
N
kk tftf
1
)()(
tNtBt
NBkftf Lk
)sin(])2
)21((2cos[)(
Basic Formulation Example of Pulse Generator
Divide (spread-and-shrink ) the whole bandwidth into several sub-bands Soft Spectrum (spectrum matching) Pulse synthesis M-ary signaling
B:bandwidth [f H ~ f L]
N division
Feasible Solution: Pulse design satisfying Spectrum Mask
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 11
doc.: IEEE 802.15-03/097r2
Submission
Robustness to MAI
Frequency characteristics
Pulse width
Tread-off
Pulse width of 10 ns
Pulse width of 3 ns
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 12
doc.: IEEE 802.15-03/097r2
Submission
Soft-Spectrum UWB PHY System Architecture
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 13
doc.: IEEE 802.15-03/097r2
Submission
Soft-Spectrum Pulse
Waveform Generator
Soft-Spectrum
Keying (Modulator)
Data in Pulse
Shaping Filter(BPF)
PowerAmplifier
(1010110….)
Base-band Data
Procession Unit
Control/Timing in
UWB Antenna
(1) AWGN Channel
(2) Multi-path Fading Channel
Soft-Spectrum Processing Bank
Example of Soft-Spectrum UWB Transmitter Block Diagram
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 14
doc.: IEEE 802.15-03/097r2
Submission
Soft-Spectrum
Pulse Integrator
Base-band Data
ProcessingUnit
Soft-Spectrum
Pulse Multiplier
Soft-Spectrum Template Generator
Information Data Out
(1010110…)
Soft-Spectrum Keying
Demodulator
Acquisition+ Channel Estimation
BPF L NAUWB Antenna
VGA
Soft-Spectrum Processing Bank
Example of Soft-Spectrum UWB Receiver Block Diagram
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 15
doc.: IEEE 802.15-03/097r2
Submission
Various Pulse Waveforms Generated by Soft-Spectrum Processing Bank
(I) Free-Verse Soft-Spectrum Pulses(II) Geometrical Soft-Spectrum Pulses
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 16
doc.: IEEE 802.15-03/097r2
Submission
K-1 Free-Verse Soft-Spectrum Pulse
K-2 Free-Verse Soft-Spectrum Pulse (Dual-cycle)(Note: several band notches happen)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 17
doc.: IEEE 802.15-03/097r2
Submission
K-3 Free-Verse Soft-Spectrum Pulse(Note: band notches clearly happen at
2.4 and 5 GHz as well)
time frequency
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 18
doc.: IEEE 802.15-03/097r2
Submission
m1
0
tt
m02
2
cos2exp
K-4 Free-Verse Soft-Spectrum Pulse(Note: pulse waveform has more freedom)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 19
doc.: IEEE 802.15-03/097r2
Submission
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Geometric Soft-Spectrum pulse waveforms with various envelopes
Triangular-type envelope Exponential-type envelope
Cosine-type envelope Gaussian-type envelope
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May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 20
doc.: IEEE 802.15-03/097r2
Submission
0 50 100 150 200 250 300 350-1.5
-1
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0
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1
1.5
Soft-Spectrum UWB multi-band signals (Cosine-type envelope)
Time(Samples)
Ampl
itud
e
Adaptive, controllable spread-and-shrink of frequency bandwidths is feasible, according to the actual
interference environment and the spectrum requirements Soft-Spectrum adaptation philosophy as mentioned
before
3 3.5 4 4.5 5 5.5 6-20
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0
Frequency(GHz)
Am
plitu
de (d
B)
Example of band allocation in Soft-Spectrum multi-band Approach
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 21
doc.: IEEE 802.15-03/097r2
Submission
Example of interference avoidance and co-existence using flexible geometric Soft-Spectrum pulse
transmission
Spectrum overlapping and possible
interference with WLAN (802.11a)
Do not use overlapping frequency
bandwidth causing possible interference
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 22
doc.: IEEE 802.15-03/097r2
Submission
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Free-Verse pulse Geometrical pulse
Exchangeable
Pow
er
Spe
ctru
m
31 2 4 5 6 7 8 9 10 11 F
5 GHz W-LAN
Dual- or three-band Multi-band
Harmonized with eachthrough
Soft-Spectrum Adaptation
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 23
doc.: IEEE 802.15-03/097r2
Submission
Modulation, Supported Data Rate and Link Budget
Soft-Spectrum Keying
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 24
doc.: IEEE 802.15-03/097r2
Submission
Soft-Spectrum Keying Modulation and Coding Scheme
• Modulation schemes (Inner-keying) : QPSK and BPSK
• Modulation schemes (Outer-keying) : M-ary Pulse Shape and Sequence Modulation (PSSM)
• Coding Schemes: Viterbi K=7, Rate ½, ¾• Pulse Guard-Intervals defined to allow
Improved multiple accessImproved ISI mitigationImproved receiving energy capture
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 25
doc.: IEEE 802.15-03/097r2
Submission
t
100 110101 •••
t
000 010001 •••
Soft-Spectrum Keying Transmit 2 bits by using BPSK/QPSK modulation in each Soft-Spectrum pulse (Inner-keying)
Transmit other more bits by defining different Soft-Spectrum pulse shapes and sequences (Outer-keying)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 26
doc.: IEEE 802.15-03/097r2
Submission
Soft-Spectrum Keying Guard-Interval is used for mitigating multipath fading effects, improving multiple access performance, and inter symbol interference (ISI)
t
t
f2
f3
t
Guard Interval(adaptive)
f1
Pulse Time
1~3 ns
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 27
doc.: IEEE 802.15-03/097r2
Submission
Supported data rate of Soft-Spectrum adaptation scheme (only Inner-keying, 5 modes)
ModeModulation
(Inner-keying)
Coding Rate
Pulse Rate [Mpulse/sec]
Soft-Spectrum PRI [ns]
Data Rate–5 modes example
[Mbs]
1 QPSK 1 250 20 500
2 QPSK ¾ 250 20 375
3 QPSK ½ 250 20 250
4 QPSK ¾ 125 40 187.5
5 QPSK ½ 125 40 125
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 28
doc.: IEEE 802.15-03/097r2
Submission
Un-coded Data Rate
[Mbps]
Coded data rate(R=3/4)
Coded data rate
(R=1/2)
No. of Outer-keying bits
No. of Inner-
keying bitsSymbol rate
107.3 80.5 53.6 6.5 10 6.5
110.5 82.8 55.3 4.5 4 13
214.5 160.8 107.3 6.5 10 13
224.3 168.2 112.1 6.5 5 19.5
448.5 336.4 224.3 15 8 19.5
604.5 453.4 302.3 15 16 19.5
Supported data rate of Soft-Spectrum adaptation scheme (Inner-keying and Outer-
keying)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 29
doc.: IEEE 802.15-03/097r2
Submission
Comparisons of Hard-Spectrum (Mono-Band) and Soft-Spectrum (Soft-Band) impulse radio
transmissions
Raw bit rate/bits per pulse / No. of sub-
bands
Raw bit rate*pulses per bit
PRF (per sub-band)
One or more bits per pulse
Multiple pulses per bitProcessing Gain (per sub-band)
Multiple sub-bandsOneFrequency Bands
LowHigh Duty Cycle (PRF)
Soft-SpectrumHard-Spectrum
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 30
doc.: IEEE 802.15-03/097r2
Submission
Parameter Throughput (Rb) Average Tx power ( TP )
Tx antenna gain ( TG )
maxmin' fff c
one of typical center frequencies of Soft-Spectrum lower sub-bands
Path loss at 1 meter ( )/4(log20 '101 cfL c )
8103c m/s Path loss at d m ( )(log20 102 dL )
Rx antenna gain ( RG )
Rx power ( 21 LLGGPP RTTR (dB))
Average noise power per bit ( )(log*10174 10 bRN )
Rx Noise Figure Referred to the Antenna Terminal ( FN )
Average noise power per bit ( FN NNP )
Minimum Eb/N0 (S) Implementation Loss (I)
Link Margin ( ISPPM NR )
Proposed Min. Rx Sensitivity Level
Value 110.5Mbps -7.8dBm
0 dBi
3.6GHz
43.6dB
20 dB at d=10 meters 0 dBi
-71.4dBm
-93.6dBm
7.0dB
-86.6dBm
6.5dB 3dB 5.7dB
-77.1 dBm
Value 224.3Mbps -7.8dBm
0 dBi
3.6GHz
43.6dB
12 dB at d=4 meters 0 dBi
-63.4dBm
-90.5dBm
7.0dB
-83.5dBm
7.2dB 3dB 9.9dB
-73.3 dBm
Link Budget of Soft-Spectrum Adaptation Scheme
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 31
doc.: IEEE 802.15-03/097r2
Submission
(I)Multiple Access Techniques and
Performance(II)
Coexistence and Narrowband Interference Mitigation
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 32
doc.: IEEE 802.15-03/097r2
Submission
B: Free-Verse pulse (K-1)
AWGNChannel
6.75GHz99% Bandwidth
Gold SequenceTH Sequence
10ns/8Frame/Slot
3ns (A)/0.39ns(B)Pulse width
PPM (Asyn.)Modulation
5, 10Users
10000bitsTransmitted data
Comparisons of Multiple Access Performance
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 33
doc.: IEEE 802.15-03/097r2
Submission
Data rate UWB : 3.2Mbps SS : 384kbpsBandwidth UWB : 3.2GHz SS : 3.4MHzDS-SS chip rate : 3.84McpsDS-SS carrier frequency ωc:2GHzUWB pulse time duration : 0.7nsNumber of pulses per symbol Ns :
31Pulse repetition time Tf : 10nsDIR:-16.66dB
Multi-user performance comparisons of the DS-SS and Soft-Spectrum systems
(2) BER of Soft-Spectrum system while receiving interference from other co-existing
DS-SS system
(1) BER of Soft-Spectrum system while causing interference to other co-existing DS-SS system
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 34
doc.: IEEE 802.15-03/097r2
Submission
Multi-user performance comparisons of the coexistence of the DS-SS and Soft-Spectrum systems
(K-2 Free-Verse pulse)
(1) BER of DS-SS system while Dual-cycle UWB system co-exists
(2) BER of Dual-cycle UWB system while DS-SS system co-exists
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 35
doc.: IEEE 802.15-03/097r2
Submission
(1) BER of DS-SS system while K-3 Soft-Spectrum system causing interference
(2) BER of K-3 Soft-Spectrum system while DS-SS system causing interference
Multi-user performance comparisons of the coexistence of the DS-SS and Soft-Spectrum systems
(K-3 Free-Verse pulse)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 36
doc.: IEEE 802.15-03/097r2
Submission
(1) BER of DS-SS system while K-4 Soft-Spectrum system causing interference
(2) BER of K-4 Soft-Spectrum system while DS-SS system causing interference
Multi-user performance comparisons of the coexistence of the DS-SS and Soft-Spectrum systems
(K-4 Free-Verse pulse)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 37
doc.: IEEE 802.15-03/097r2
Submission
Coexistence with Existing Narrowband System
IEEE 802.11a is the strongest narrowband interferer
Soft-Spectrum coexistence way– Do not use interfered bands for coexistence
with IEEE 802.11a WLAN devices
Channel allocation can be freely, dynamically assigned depending on channel monitoring results and regional regulations
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 38
doc.: IEEE 802.15-03/097r2
Submission
Coexistence Strategies Soft-Spectrum coexistence
– Pre-configure device (through software control) not to use a particular band, based on various geographic region and device usage
– Allow device to detect presence of NBI and avoid– Device interoperability functions could specify
detection requirements to ensure adequate control UWB power emitted into 802.11a bands and 4.9 GHz
WLAN band in Japan– Avoiding 5.25 GHz (5.8 GHz) band for lower
(upper) UNII band coexistence– Avoiding 4.7 GHz band (4.975 GHz using
frequency offset channels)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 39
doc.: IEEE 802.15-03/097r2
Submission
Soft-Spectrum Adaptation Scheme in AWGN and Multipath Fading
Environment
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 40
doc.: IEEE 802.15-03/097r2
Submission
Soft-Spectrum Immunity in Multipath Fading Environment
Decrease inter-pulse interference (ISI) by employing adaptive Guard-Interval
Decrease multipath fading effects by choosing suitable Soft-Spectrum waveforms
Use baseband Pre- and Post-Rake receiver based on designing suitable intra-pulse waveform
Continuous channel measurements are good for changing multipath environment
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 41
doc.: IEEE 802.15-03/097r2
Submission
Indoor multipath fading: Example of indoor UWB impulse radio signal propagation (IEEE 802.15SG3a S-V model: CM1, CM2, CM3, CM4)
0 50 100 150 200 250-0.8
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0.6Impulse response realizations
Time (ns)
From transmitter
TX RX
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 42
doc.: IEEE 802.15-03/097r2
Submission
0 50 100 150 200 250 300 350 400-1
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1Soft-Spectrum UWB transmitted signal
Time
Ampl
itude
0 50 100 150 200 250 300 350 400-2
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1
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2Soft-Spectrum UWB transmitted signal+AWGN
Time
Ampl
itude
0 50 100 150 200 250 300 350 400-1
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1Soft-Spectrum UWB transmitted signal (Gaussian-type envelope)
Time
Ampl
itude
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0 0.5
1
1.52
Soft-Spectrum UWB transmitted signal+AWGN (Gaussian-type envelope)
Time
Ampl
itude
0 50 100 150 200 250 300 350 400- 1
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1Soft- Spectrum UWB transmitted signal (Sinc(x)- type envelope)
Time
Ampli
tude
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- 1-0.5
00.5
11.5
2Soft- Spectrum UWB transmitted signal+AWGN (Sinc(x)- type envelope)
Time
Ampli
tude
Various geometrical Soft-Spectrum pulse sequences in AWGN channel
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 43
doc.: IEEE 802.15-03/097r2
Submission
BER simulation for Soft-Spectrummulti-bands pulse waveforms (Rx: 2 oversamples/ bit)
1.E- 04
1.E- 03
1.E- 02
1.E- 01
1.E+00
0 2 4 6 8Eb/ No(dB)
BER
Sinc- typeCosine- typeGaussian-typeBPSK-SimulationBPSK-Theory
BER simulation for Soft-Spectrummulti-bands pulse waveforms (Rx: 4 oversamples/ bit)
1.E- 04
1.E- 03
1.E- 02
1.E- 01
1.E+00
0 2 4 6 8Eb/ No (dB)
BER
Sinc- typeCosine-typeGaussian- typeBPSK-SimulationBPSK-Theory
BER vs. Eb/No performance in the presence of AWGN (Receiver: 2 over-samples)
BER vs. Eb/No performance in the presence of AWGN (Receiver: 4 over-samples)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 44
doc.: IEEE 802.15-03/097r2
Submission
Geometric Soft-Spectrum pulses Group Delay
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Geometric Soft-Spectrum inter-pulse interference caused by multipath fading
Group Delay
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May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 45
doc.: IEEE 802.15-03/097r2
Submission
Inter-pulse interference effects of multipath fading on various geometric Soft-Spectrum pulse waveforms
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May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 46
doc.: IEEE 802.15-03/097r2
Submission
0 100 200 300 400 500 600 700 800 900 1000-2
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-1
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2UWB multipath fading signal
Time
Ampl
itude
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1
1.5UWB multipath channel impulse response
Time
Ampl
itude
0 50 100 150 200 250 300 350 400-2
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-1
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2UWB multipath fading signal
Time
Ampl
itude
0 50 100 150 200 250 300 350 400-3
-2
-1
0
1
2
3UWB multipath fading signal+AWGN
Time
Ampl
itude
Geometrical Soft-Spectrum pulse sequences in multipath fading channel
(Cosine-type pulse waveform)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 47
doc.: IEEE 802.15-03/097r2
Submission
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2-1.5
-1
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Geometrical Soft-Spectrum receiving signal re-sampling (Cosine-type envelope)
Time
Ampl
itude
100 samples
Re-sampling
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 48
doc.: IEEE 802.15-03/097r2
Submission
-1
-0.5
0
0.5
1Am
plitu
de
-1
-0.5
0
0.5
1
Ampl
itude
Timing off-set =0.25, 0.5, 1.0, 1.5
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 49
doc.: IEEE 802.15-03/097r2
Submission
Effect of Tansmitter- Recever Timing off- set(Multi- band:AWGN channel)
1.E- 05
1.E- 04
1.E- 03
1.E- 02
1.E- 01
1.E+00
0 2 4 6 8EbNo (dB)
BER
J itter=0.5J itter=1.0J itter=1.5J itter=0.25BPSK- TheoryBPSK- Simulation
Effect of transmitter- receiver timing off-set(Multi-band:multipath fading channel)
1.E- 05
1.E- 04
1.E- 03
1.E- 02
1.E- 01
1.E+00
0 2 4 6 8EbNo (dB)
BER
J itter=0.5J itter=1.0J itter=1.5J itter=0.25BPSK-TheoryBPSK-Simulation
BER vs. Eb/No performance in the presence of receiver timing off-set (AWGN channel)
BER vs. Eb/No performance in the presence of receiver timing off-set (multipath fading channel)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 50
doc.: IEEE 802.15-03/097r2
Submission
Multipath diversity for geometric Soft-Spectrum intra/inter pulse combining
Tc
C 1
(t)C 2
(t)C 3
(t)CN(t)
Tc Tc
Soft-Spectrum Rake Receiver
BPF
-0.5
0
0.5
1
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 51
doc.: IEEE 802.15-03/097r2
Submission
Implementation Feasibility Soft-Spectrum adaptation scheme has many features designed
to achieve low-complexity and low power consumption– Dynamic, non-overlapped timing
• Shared Soft-Spectrum processing bank (pulse generator, ADC, and Soft-Spectrum correlator)
– Reduced power consumption via adaptive duty cycle of Soft-Spectrum sub-band• Don’t necessarily require many continuously running PLLs
– Reused circuits: exchangeable by software realizing smaller die area
Many components in common with other UWB architectures– LNA, BPF/LPF, AGC, VGA, and digital processing unit
Many possible transceiver implementations and following version-ups based on Software Defined Radio architecture
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 52
doc.: IEEE 802.15-03/097r2
Submission
Self-Evaluation General Solution CriteriaCRITERIA REF. IMPORTANCE
LEVEL PROPOSER RESPONSE
Unit Manufacturing Complexity (UMC)
3.1 B 0
Signal Robustness
Interference And Susceptibility
3.2.2 A +
Coexistence 3.2.3 A +
Technical Feasibility
Manufacturability 3.3.1 A +
Time To Market 3.3.2 A 0
Regulatory Impact 3.3.3 A +
Scalability (i.e. Payload Bit Rate/Data Throughput, Channelization – physical or coded, Complexity, Range, Frequencies of Operation, Bandwidth of Operation, Power Consumption)
3.4 A +
Location Awareness 3.5 C 0
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 53
doc.: IEEE 802.15-03/097r2
Submission
Self-Evaluation PHY Protocol CriteriaCRITERIA REF. IMPORTANCE
LEVEL PROPOSER RESPONSE
Size And Form Factor 5.1 B 0
PHY-SAP Payload Bit Rate & Data Throughput
Payload Bit Rate 5.2.1 A +
Packet Overhead 5.2.2 A +
PHY-SAP Throughput 5.2.3 A +
Simultaneously Operating Piconets
5.3 A +
Signal Acquisition 5.4 A +
System Performance 5.5 A +
Link Budget 5.6 A +
Sensitivity 5.7 A 0
Power Management Modes 5.8 B +
Power Consumption 5.9 A +
Antenna Practicality 5.10 B 0
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 54
doc.: IEEE 802.15-03/097r2
Submission
Self-Evaluation MAC Protocol Enhancement Criteria
CRITERIA REF. IMPORTANCE LEVEL PROPOSER RESPONSE
MAC Enhancements And Modifications
4.1. C 0
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 55
doc.: IEEE 802.15-03/097r2
Submission
1960’s
Mono-pulse
1990’s
Pulse Sequences
(TH-PPM)
2002-02-14
FCC 02-48
UWB Report & Order
Multi-Band
Dual-Band
Single-Band
Soft-Spectrum
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 56
doc.: IEEE 802.15-03/097r2
Submission
Summary (I)
We propose a Ultra Wideband impulse radio transferring scheme utilizing Soft-Spectrum Adaptation and free, dynamic pulse waveform shaping.
Soft-Spectrum Adaptation and free, dynamic pulse waveform shaping can satisfy the FCC Spectrum Mask and other regional regulation, and be applied to avoid possible interferences with other existing narrowband wireless systems.
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 57
doc.: IEEE 802.15-03/097r2
Submission
Scalable and adaptive performance improvement can be achieved by utilizing the pulse waveform shaping even in multi-user and multipath fading environment.
Since R&D of UWB has still been in progress, a standardization should not restrict the progress by only choosing easiest current technology while leaving more flexibilities in signaling, modulation, etc. in UWB physical layer.
Summary (II)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 58
doc.: IEEE 802.15-03/097r2
Submission
Back Materials
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 59
doc.: IEEE 802.15-03/097r2
Submission
We also propose a local sine template receiving scheme.
Simplified correlation scheme and immunity to multipath fading can be achieved.
Initial-phase control is needed.
Local Sine Template Receiving Scheme
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 60
doc.: IEEE 802.15-03/097r2
Submission
Utilizing local-generated sine template instead of conventional TH-PPM template-pulse Simplified correlator circuits Low cost, low power consumption Robustness to impulse radio multipath fading Necessary to estimate and control local Initial-phase
Characteristics of proposed Local Sine Template receiving
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 61
doc.: IEEE 802.15-03/097r2
Submission
Pulse sequences generation and modulation on transmitting side
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 62
doc.: IEEE 802.15-03/097r2
Submission
Pulse sequences after Band Pass Filtering (BPF) on transmitting side
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 63
doc.: IEEE 802.15-03/097r2
Submission
Received pulse sequences before adding AWGN on receiving side
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 64
doc.: IEEE 802.15-03/097r2
Submission
Received pulse sequences after adding AWGN on receiving side
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 65
doc.: IEEE 802.15-03/097r2
Submission
Received pulse sequences after BPF and Mixer on receiving side (Correlation with local sine template)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 66
doc.: IEEE 802.15-03/097r2
Submission
Received pulse sequences after Low Pass Filtering (LPF) on receiving side (demodulation and data out)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 67
doc.: IEEE 802.15-03/097r2
Submission
Effects of Initial-phase estimation scheme (i.e. Initial-phase=180deg)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 68
doc.: IEEE 802.15-03/097r2
Submission
Effects of Initial-phase estimation scheme (i.e. Initial-phase=150deg)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 69
doc.: IEEE 802.15-03/097r2
Submission
Effects of Initial-phase estimation scheme (i.e. Initial-phase=120deg)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 70
doc.: IEEE 802.15-03/097r2
Submission
Effects of Initial-phase estimation scheme (i.e. Initial-phase=90deg)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 71
doc.: IEEE 802.15-03/097r2
Submission
Effects of Initial-phase estimation scheme (i.e. Initial-phase=45deg)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 72
doc.: IEEE 802.15-03/097r2
Submission
Effects of Initial-phase estimation scheme (i.e. Initial-phase=0deg)
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 73
doc.: IEEE 802.15-03/097r2
Submission
QoS (Quality-of-Service) Enhancement to IEEE 802.15.3
MAC Layer
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 74
doc.: IEEE 802.15-03/097r2
Submission
Master or Hub
Slave or Leaf node Proxy node or
wireless Bridge
A
B
C
Several neighbor piconets in UWB multiuser environment
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 75
doc.: IEEE 802.15-03/097r2
Submission
Source node
Data link layer control: identification and management of usable resource
multi-hop link
one-hop direct link Destination node
Multi-hop UWB WPAN with resource management, relaying and route discovering
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 76
doc.: IEEE 802.15-03/097r2
Submission
UWB multi-hop communications with Ad-hoc real-time relaying for multimedia data transfer
(Multipath combining scheme is used by the real-time UWB Repeater)
RXTX UWB RP
Pre-RakePost-Rake
TX RX RP
10 m 10 m
May, 2003
R. Kohno, H. Zhang, H. Ogawa, CRL-UWB Consortium
Slide 77
doc.: IEEE 802.15-03/097r2
Submission
-20 -15 -10 -5 0 5 10 1510
-6
10-5
10-4
10-3
10-2
10-1
100BER in free space loss and AL (assumed loss: -10dB more power attenuation than free space loss)
SNR[dB]
BER
direct path onlymultipath channel
multipath channel without direct path between TX and RXusing Rake on the RP
using Rake on the RP but RP receives no direct pathmultipath channel in AL
multipath channel without direct path between TX and RP in ALusing Rake on the RP in AL
using Rake on the RP in AL but RP receives no direct path
Performance improvement by usingMultipath combining scheme at the real-time UWB Repeater