Sep. 2004 H. Lee, D. Park, D. Sung, S. Jung and J. Lee doc.: IEEE 802. 15-04-0485-03-004a Submission...

Sep. 2004

H. Lee, D. Park, D. Sung, S. Jung and J. Lee

doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 1

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

Submission Title: Multi-coded Bi-orthogonal PPM (MC-BPPM) Based Impulse Radio TechnologyDate Submitted: 8 Sep., 2004Source: [Hyung Soo Lee (1), Cheol Hyo Lee (1), Dong Jo Park (2), Dan Keun Sung (2), Sung Yoon Jung (2), Joon Yong Lee (3)]Company: [(1) Electronics and Telecommunications Research Institute (ETRI) (2) Korea Advanced Institute of Science and Technologies (KAIST) (3) Handong Global University (HGU)]Address: [(1) 161 Gajeong-dong, Yuseong-gu, Daejeon, Republic of Korea (2) 373-1 Guseong-dong, Yuseong-gu, Daejeon, Republic of Korea (3) Heunghae-eup, Buk-gu, Pohang, Republic of Korea]Voice: [(1) +82 42 860 5625, (2) +82 42 869 5438, (3) +82 54 260 1931], FAX: [(2) +82 42 869 8038]E-Mail: [(1) [email protected], (2) [email protected], (3) [email protected]]

Abstract: [This document proposes preliminary proposal for the IEEE 802.15.4 alternate PHY standard]

Purpose: [Preliminary Proposal for the IEEE802.15.4a standard]

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

Sep. 2004


doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 2

Multi-Coded Bi-orthogonal PPM Based Impulse Radio Technology

ETRI-KAIST-HGURepublic of Korea

Sep. 2004


doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 3

Contents

• Band Plan• Pulse Design• Multi-Coded Bi-orthogonal PPM (MC-BPPM)• PHY Frame Structure• Transceiver Architecture• Data Rate• Link Budget• Ranging Accuracy for Location Awareness

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doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 4

Band Plan• Bandwidth : Two bands

- Low band (3.1 to 4.9 GHz) : Mandatory band

- High band (5.825 to 10.6 GHz)

Low band

3 4 5 6 7 8 9 10 11

High band

3 4 5 6 7 8 9 10 11

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doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 5

Low Band Pulse Design : Example (1)• Prolate pulse*

- Pulse duration : 2.1376ns Bandwidth : 1.8GHz

*: Parr, B.; ByungLok Cho; Wallace, K.; Zhi Ding Communications Letters, IEEE , Volume: 7 , Issue: 5 , May 2003

Sep. 2004


doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 6

Low Band Pulse Design : Example (2)• Chaotic pulse

- Large base signal (base=2*bandwidth*duration)

- Flexible bandwidth and signal duration

Sep. 2004


doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 7

Multi-Coded Bi-orthogonal PPM (MC-BPPM)

• Operation example (L=3, Ns=4, Nr=1, Tg=0 ns)

Data block( L bits )Ex. L=3

Orthogonal code set( Code Length : Ns )

Ex. Ns=4 Modulation

Multi-coded symbol( Code rate : L/Ns )Ex. Code rate = 3/4

1 -3 1 1

Bi-orthogonal PPM :

1

-1

1

1-1-11

-1-111

-11-11

1-1-11

11-1-1

-11-11

11-31

Sep. 2004


doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 8

PHY Frame Structure• Frame structure of PPDU (example)

Preamble SFD PHR PSDU

...

...

...

s

r

m

c

s

g

d

L

N

N

T

T

T

T

T

: # of bits per data block: Orthogonal code length: # of repetitions: Pulse bin width (duration)

: Total transmit time duration of a data block: Guard time for processing delay

: Multi-coded chip duration: Multi-coded symbol duration

1 2 rN

sN

: # of Repetitions

: Code length

sT

cT

2

1L

1 2 sN

122

1L : Position number for BPPM

mT

rN

gT gT gT

dT

Sep. 2004


doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 9

• Transmitter

• Receiver

Transceiver Architecture

1 2

T

Lb bb b 1 2 s

T

Nd d d d

1 2, , , Lc c cd C b

( )r tData ModulatorBi-phase PPM

ChannelData EncoderOrthogonalMulti-code

Data

PulseGenerator

1 2

T

Lb bb b 1 2, , , Lc c c

Tb C d

1 2 s

T

Nd d d d

( )r tData DecoderOrthogonalMulti-code

DataDeModulatorBi-phase PPM

Data

PulseGenerator

LocationDetector

Sep. 2004


doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 10

Data Rate

Tm L Ns NrData

RateTarget

Data Rate

200ns 1 32 128 1.220 kbps 1 kbps

200ns 1 16 16 19.53 kbps 20 kbps

200ns 3 16 4 117.19 kbps 100 kbps

200ns 5 8 1 1.042 Mbps 1 Mbps

• Low band modes (example)

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doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 11

Link Budget : ExampleParameter Unit Value

1. Information data rate kbps 1000 1

2. Distance (d) m 30 30

3. Average TX power dBm -8.75 -35.75

4. Tx antenna gain dBi 0 0

5. Geometric center freq. GHz 4 4

6. Path loss at 1 m dB 44.5 44.5

7. Path loss at d m dB 29.5 29.5

8. Rx antenna gain dBi -3 -3

9. Rx power dBm -85.75 -112.75

10. Average noise power per bit dBm -114 -144

11. Rx noise figure (NF) dB 6.6 6.6

12. Average noise power per bit dBm -107.4 -137.4

13. Required Eb/No dB 14 11.5

14. Implementation Loss dB 2.5 2.5

15. Rx. Sensitivity Level dBm -90.9 -123.4

16. Link Margin dB 5.15 10.65

• Bandwidth : 1.8GHz• MC-BPPM• 1% PER

(32 Octets/Packet)

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doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 12

Location Awareness : Ranging Accuracy

Parameter Unit Value

Information data rate Kbps 1

L - 1

Ns - 32

Nr - 128

Tm ns 200

Number of packets transmitted for range estimation

- 2

Peak SNR dB 2.047

Pulse - Prolate Pulse (BW:1.8GHz)

Channel mode - CM4

Sample interval ns 0.2

Search region duration (Tsearch) ns 40

# of integration (Nint) - 32 x 128 x 2 / 40 x 0.2 = 40

RMS accuracy of ToA estimation ns 1.19

RMS accuracy of ranging m 0.36

Sep. 2004


doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 13

Conclusions

• Multi-Coded Bi-orthogonal PPM– Candidates for UWB Pulses

Prolate pulse / Chaotic pulse

– Time-diversity gain– Data rate scalability– Wide pulse bin width

Reduced duty cycle Mitigated Inter bin Interference (IBI)

Sep. 2004


doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 14

Back-Up Slides

Sep. 2004


doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 15

Link Capacity of MC-BPPM• Parameter Setting

– Tm=2.1376ns(=Tw) , Tg=0ns / Ns=4 & 8 , Nr=1

– Comparison with M-ary BPPM, BPSK

– Same Tx. pulse power per bit (Ns : repetition code length for BPPM, BPSK)

Sep. 2004


doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 16

Pulse Bin Width (Tm)• Pulse bin width vs. link capacity

Higher link capacity

Lower data transmission time

Wide pulse bin width is possible!!• Multipath immunity => Low Rx. complexity

( No equalizer )

Sep. 2004


doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 17

Pulse Bin Width (Tm)• Pulse bin width comparison

– Comparison with (M-ary) BPPM & BPSK

– Same link capacity condition, same Tx. pulse power per bit EbNo (dB)

(L,Ns)0 2 4 6 8 10 Avg.

(1,4)BPPM 0.995 0.998 1.005 1.003 1.000 1.000 1.000

BPSK 1.001 1.000 1.001 0.999 1.000 1.000 1.000

(3,4)BPPM 0.604 0.606 0.587 0.554 0.521 0.505 0.563

BPSK 0.760 0.769 0.755 0.723 0.691 0.672 0.728

(1,8)BPPM 1.003 1.005 1.003 0.999 0.999 1.000 1.002

BPSK 1.001 0.999 0.999 0.999 0.999 1.000 1.000

(3,8)BPPM 0.580 0.584 0.573 0.548 0.520 0.505 0.552

BPSK 0.766 0.768 0.752 0.722 0.691 0.672 0.728

(5,8)BPPM 0.211 0.222 0.225 0.214 0.199 0.190 0.210

BPSK 0.742 0.745 0.722 0.677 0.633 0.609 0.688

Sep. 2004


doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 18

Pulse Bin Width (Tm)• Example

– Let L=5, Ns=8

–

(BPPM)

(BPSK)

42

138

m

m

T ns

T ns

(MC-BPPM) 200mT ns

(MC-BPPM) 200mT ns

(BPSK) 138mT ns

(BPPM) 42mT ns

• Lower pulse duty cycle than M-ary BPPM & BPSK

Sep. 2004


doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 19

Pulse Bin Width (Tm)• Example

– Let L=5, Ns=8

–

(BPPM)

(BPSK)

42

138

m

m

T ns

T ns

(MC-BPPM) 200mT ns

(MC-BPPM)mT

(BPSK)mT

(BPPM)mT

• More multipath Immunity than (M-ary) BPPM & BPSK!!

• No additional complexity to mitigate IBI!!

< TG 3a CM 4 >

Sep. 2004


doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 20

Location Awareness : Scenarios

• Criteria

– Mobility of Nodes- Stationary, movable, or mobile

– Density of Nodes- Dense or sparse

– Mobility of Reference Nodes- Stationary, movable, or mobile

– Position Accuracy- Low / Medium / High accuracy

Wake up “Yellow shirts”.

“Information”

Sensor network by UWB

UWB tag

UWB tag

UWB tag

UWB tag

UWB tag

UWB tag

UWB tag

UWB tag

UWB tag

Nodes are stationary

Nodes are mobile

*Source : IEEE 15-03-0537-00-004a

Sep. 2004


doc.: IEEE 802. 15-04-0485-03-004a

Submission

Slide 21

Location Awareness : ToA Measurement of Direct Path Signal

• Search by sampling over multiple-pulse transmissions• References:

• Joon-Yong Lee and Robert A. Scholtz, "Ranging in a dense multipath environment using an UWB radio link" , IEEE Journal on Selected Areas in Communications, vol.20, no.9, pp.1677 - 1683, Dec. 2002

• Robert A. Scholtz and Joon-Yong Lee, "Problems in modeling UWB channels", 36'th Asilomar Conference on Signals, Systems & Computers, Nov. 2002

Initial lock point

Serial search by sampling & integration(Search for the 1st level-crossing point)

Length of search region searchT Correlator output

Threshold ToA of direct path

Sep. 2004 H. Lee, D. Park, D. Sung, S. Jung and J. Lee doc.: IEEE 802. 15-04-0485-03-004a Submission...

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