project: ieee p802.15 working group for wireless personal area networks (wpans)

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 1

doc.: IEEE 802.15-<03147r2>

Submission

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: [Multicarrier-UWB]Date Submitted: [8 March 2003]Source: [Ahmed H Tewfik] Company [University of Minnesota]Address [Dept. of Electrical and Computer Engineering, Room 4-174 EECS Bldg.,Minneapolis, MN 55455]Voice:[612-625-6024], FAX: [612-625-4583], E-Mail:[tewfik@ece.umn.edu]

Re: [03147r0P802-15_TG3a-University-of-Minnesota-CFP-Presentation.ppt]

Response to a Call for Contributions Task Group 3a Call For Intent and Proposals, November 2002, updated January 2003, 02371r0P802-15_SG3a-5_Criteria.doc

Abstract: [We propose a multi-carrier UWB system for WPAN communications. We describe system design issues and proposed transmitter and receiver structures. We also provide a self-evaluation of the proposed system.]

Purpose: [For consideration by 802.15.3a task group.]

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 5, 2003

Tewfik/Saberinia, U. of MNSlide 2

doc.: IEEE 802.15-<03147r2>

Submission

Fast Frequency HoppingUWB-OFDM

A. H. Tewfik and E. Saberinia

University of Minnesota

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 3

doc.: IEEE 802.15-<03147r2>

Submission

Overview• FFH-UWB-OFDM: compromise between multi-

UWB and pure OFDM• Proposed System• System comparisons and design trade-offs• Transmitter and Receiver Structure • Link Budget• Performance of the System• Coexistence and Multiple piconets• Complexity and Power Consumption• D/A and A/D structure• Conclusion

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 4

doc.: IEEE 802.15-<03147r2>

Submission

Multi-Carrier UWB

• Multi-band UWB– Need multiple band transmitter – Need a block of analog matched filters

• Pure OFDM UWB– No need for Rake receiver– Need heavy coding to extract frequency diversity – Long FFT and IFFT

• FFH-UWB-OFDM (some where between!)– No need for Rake receiver– Implemented short IFFT and FFT technology– Extract multipath diversity and use smaller number of

Subcarriers

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 5

doc.: IEEE 802.15-<03147r2>

Submission

An FFH-UWB-OFDM Block

• Make an OFDM block with N-IFFT of QAM symbols (N=32)

• Create a base band signal with bandwidth W> 500 MHz and Duration Tu ns

0

1

30

31

0 Tu t

f(MHz)

W

0

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 6

doc.: IEEE 802.15-<03147r2>

Submission

An FFH-UWB-OFDM Block

• Fast frequency hopping inside the block to achieve multipath resolution and frequency spreading

• Avoid UNII band– Use only 3.1-4.8 GHz (Lower Band

System)– Use whole band and avoid 4.8-5.9 GHz

(Whole Band System)

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 7

doc.: IEEE 802.15-<03147r2>

Submission

Frequency Hopping for Lower Band System

01

3031

0 1.81 3.6364 5.4545 t(ns)

f(GHz)

4.75

4.2

3.65

3.1

01

3031

01

3031

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 8

doc.: IEEE 802.15-<03147r2>

Submission

Frequency Hopping for Whole Band System

0 5.45 t(ns)

f(GHz)

9.7

5.9

4.75

3.101

3031 01

3031 01

3031

01

3031 01

3031 01

3031 01

3031 01

3031

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 9

doc.: IEEE 802.15-<03147r2>

Submission

An FFH-UWB-OFDM Block• Repeat this block every T=12.8ns N=32 times

f(GHz)

4.75

4.2

3.65

3.1 01

2223

01

2223

01

2223

01

2223

01

2223

01

2223

0 5.45 12.8 t(ns)

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 10

doc.: IEEE 802.15-<03147r2>

Submission

Spectrum

• Bandwidth=1.65GHz• Multipath resolution=0.6ns

• Bandwidth=7.5GHz• Multipath resolution=0.13ns

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 11

doc.: IEEE 802.15-<03147r2>

Submission

Proposed System

• N=32 Subcarrier

• ¾ Convolutional Channel Coding

• QAM Constellation:

QPSK: 110 Mbit/s

16-QAM: 220 Mbit/s

64-QAM: 480 Mbit/s

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 12

doc.: IEEE 802.15-<03147r2>

Submission

Transmitter

Frequency Hopping

PAMsignal

X¾

Convlution Code

IFFT

Input rate= 78.22 M sample/s

Sample and Hold for Ts= 5.45 ns

Interleaving

QAM Mapping

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 13

doc.: IEEE 802.15-<03147r2>

Submission

Receiver

LPF 1 bitA/D

X

SYNC VCO

LPF

1 bitA/DX

AGC

P*(n)

P*(n)

X

X

Decision

Bitmappin

gDecision

exp(j..)

exp(j..)

X

X

pilot

Info. Bearingcarrier

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 14

doc.: IEEE 802.15-<03147r2>

Submission

Link Budget

Parameter Value Value Value

Throughput (Rb) 110 Mb/s 220 Mb/s 480 Mb/s

Average Tx power ( TP ) -9.1dBm -9.1dBm -9.1dBm

Tx antenna gain ( TG ) 0 dBi 0 dBi 0 dBi

maxmin' fff c : 3.8GHz 3.8GHz 3.8GHz

Path loss at 1 meter ( )/4(log20 '101 cfL c ) 44.1dB 44.1dB 44.1dB

Path loss at d m ( )(log20 102 dL ) 20 dB at d=10 meters

12 dB at d=4 meters

6 dB at d=2 meters

Rx antenna gain ( RG ) 0 dBi 0 dBi 0 dBi

Rx power ( 21 LLGGPP RTTR (dB)) -73.2dBm -65.2dBm -59.2dBm

Average noise power per bit ( )(log*10174 10 bRN )

-93.6dBm -90.6dBm -87.2dBm

Rx Noise Figure Referred to the Antenna Terminal ( FN )1

7dB 7dB 7dB

Average noise power per bit ( FN NNP ) -86.6dBm -83.6dBm -80.2dBm

Minimum Eb/N0 (S) 5.5dB 8.4dB 11dB

Implementation Loss2 (I) 3dB 3dB 3dB

Link Margin ( ISPPM NR ) 4.9dB 7dB 7dB

Proposed Min. Rx Sensitivity Level3 -dBm -dBm -dBm

Value Value Value

110 Mb/s

220 Mb/s 480 Mb/s

dBm -dBm -dBm

0 dBi 0 dBi 0 dBi

GHz GHz GHz

dB dB dB

20 dB at d=10

12 dB at d=4

6 dB at d=2

0 dBi 0 dBi 0 dBi

-dBm -dBm -dBm

-93.6dBm -90.6dBm -87.2dBm

7dB 7dB 7dB

-86.6dBm -83.6dBm -80.2dBm

dB dB dB

3dB 3dB 3dB

dB dB dB

-dBm -dBm -dBm

Whole Band System Lower Band System

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 15

doc.: IEEE 802.15-<03147r2>

Submission

BER vs SNR for CM3

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 16

doc.: IEEE 802.15-<03147r2>

Submission

BER vs SNR for CM4

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 17

doc.: IEEE 802.15-<03147r2>

Submission

Bit rate versus Distance

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 18

doc.: IEEE 802.15-<03147r2>

Submission

Bit rate versus Distance

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 19

doc.: IEEE 802.15-<03147r2>

Submission

Bit rate versus Distance

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 20

doc.: IEEE 802.15-<03147r2>

Submission

Coexistence

Proposed system spectrum

Target

802.11a

-91dBm

- 88 dBm

802.11b

-360dBm

- 82 dBm

802.15.1

-370dBm

- 76 dBm

802.15.3

-360dBm

- 81 dBm

802.15.4

-370dBm

- 91 dBm

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 21

doc.: IEEE 802.15-<03147r2>

Submission

Multiple Piconets

• Simultaneous operation achieved by proper selection of:– Different FH code (for whole band system)– Use of piconet dependent pilots– Combination of above

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 22

doc.: IEEE 802.15-<03147r2>

Submission

Pilot Assisted Demodulation

MF

MF

Correlator

Energy Detector

Decision

Energy Detector

Information bearingcarrier

Pilot

r(t)

pilots

Information bearingcarriers

MF

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 23

doc.: IEEE 802.15-<03147r2>

Submission

Transmitter Complexity and Power Consumption

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 24

doc.: IEEE 802.15-<03147r2>

Submission

Receiver Complexity and Power Consumption

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 25

doc.: IEEE 802.15-<03147r2>

Submission

Traditional Sigma Delta

1

1

1 z +

1z

1 bitquantizer

+

-

X(n)

y(n)

1 1 1 1

quantizationerror

( ) ( ) (1 ) ( ) .Y z X z z E z

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 26

doc.: IEEE 802.15-<03147r2>

Submission

Traditional Sigma Delta A/D

X(t)

Multibit

X(n)

1

1

1 z +

1z

1 bitquantizer

+

-

LowpassFiltering and

downsamplingoversample

Analog switched capacitor implementation

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 27

doc.: IEEE 802.15-<03147r2>

Submission

Traditional Sigma Delta D/A

X(n)

X(t)

1

1

1 z +

1z

1 bitquantizer

+

-

Analog LowpassFiltering

upsample

L1 bit D/A

• Higher order preferred:– Better noise shaping– Eliminate spurious tones

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 28

doc.: IEEE 802.15-<03147r2>

Submission

N Tone Sigma Delta

1

1 Nz +

Nz

1 bitquantizer

+

-

X(n)

y(n)

j2 k/N

1 1

zeros at quantizationerrore

( ) ( ) (1 ) ( ).N NY z X z z E z

(e.g., output of N point IFFT)

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 29

doc.: IEEE 802.15-<03147r2>

Submission

N Tone Sigma Delta

0 100 200 300 400 500 600-2.5

-2

-1.5

-1

-0.5

0

0.5

1

1.5

2

2.5

Time

Ou

tpu

t of f

ilte

rs

0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.50

100

200

300

400

500

600

Fractional frequency offsetA

mp

litu

de

Filter outputs “Instantaneous” Frequency spectrum

May 5, 2003

Tewfik/Saberinia, U. of MNSlide 31

doc.: IEEE 802.15-<03147r2>

Submission

Conclusion

• FFH-UWB-OFDM provides a compromise between pure OFDM and Multi-band UWB

• It avoids Rake type receiver with reasonable size FFT-IFFT

• Low complexity transmitter and receiver structures possible