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:[[email protected]]
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