Transcript May 5 2003 doc.: IEEE 802.15-03101r1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Channel ized, Optimum Pulse.

May 5 2003
doc.: IEEE 802.15-03101r1
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Channel ized, Optimum Pulse Shaped UWB PHY Proposal]
Date Submitted: [May 2003]
Source: [Jonathon Cheah] Company [Femto Devices Inc.]
Address [5897 Oberlin Drive #208, San Diego CA 92121]
Voice:[858-404-0457], FAX: [858-404-0457], E-Mail:[[email protected]]
Re: [.]
[Response to call for Proposal]
Abstract: [This proposal addresses a complete implement able UWB PHY architecture within the FCC UWB rule, and taking into account
of the potential feasibility in Silicon fabrication. The proposed PHY shall satisfy the basic 100 Mbps requirement, and the optional requirement
of 480 Mbps..]
Purpose: [This proposal is submitted for consideration of IEEE802.15.3a PHY 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.
Submission
Slide 1
Jonathon Cheah, femto Devices Inc.
Contents
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Re statement of design goals
Revisit: PHY Specification summary
Revisit: Channel Plan
Revisit: NII interference co-existence
Piconet co-existence
Length 11 Time Frequency code
Wake-up unique word
Receiver chain
Mode of operation
Channel response
Link budgets
May 2003
Jonathon Cheah, femto Devices
Inc.
2
Goal
• The goal of this design is cost, cost, cost, low
DC power consumption, then performance.
• The goal is to seek the simplest, and minimum
configuration solution to meet the requirements.
• This presentation is an extension of the March
submission to provide further detail results with
respect to channel performance.
May 2003
Jonathon Cheah, femto Devices
Inc.
3
Revisit : PHY Specifications
Summary
•
•
•
•
•
•
•
•
8 basic channel at 800 Mhz bandwidth
Length 11 Time Frequency code
Time multiplexed Receiver chain
Gaussian wave-shaped pulses
OOK modulation for Wake-up sequence
BPSK modulation data transmission.
2 finger Rake receiver followed by Equalizer
FEC Convolution rate ½ code constraint length 7
May 2003
Jonathon Cheah, femto Devices
Inc.
4
Revisit-- Channel Plan
• Define 8 x 800 Mhz (-4.3 dB BW) channels
to cover 3.1 to 10.6 Ghz
• FCC defined 10dB BW is 1.2 Ghz per
channel.
• Channels are: 4.000, 4.800, 5.600, 6.400,
7.200, 8.000, 8.800, 9.600 Ghz. (~1 Ghz
from band edge.)
May 2003
Jonathon Cheah, femto Devices
Inc.
5
Basic 8 by 800 Mhz Channel Plan
with indoor & Handheld limits
May 2003
Jonathon Cheah, femto Devices
Inc.
6
802.11A coexistence
• Lower NII band can be avoided by missing
channel 2
• Upper NII band can be avoided by missing
channel 3
• Time-frequency codes can be used to
avoid these channels if needed.
May 2003
Jonathon Cheah, femto Devices
Inc.
7
Piconets
• Independent Piconet is separated by Time
frequency code set.
• It is possible to extract maximum distance
Time-frequency code set for Piconet
operation.
• 10 codes available
May 2003
Jonathon Cheah, femto Devices
Inc.
8
Time-frequency code length
• The number of independent receiver chain is = Time
frequency code length.
• The longer the code length, the lower is the PRF, and the
lesser the effect of delay spread.
• Code length = 4, at 500Mbps can pass basic CM1 to
CM4 requirements, ie: The delay spread can be handled
by the Rake/Equalizer pair at this rate.
• However Code length =11 is used for FCC average
power and Piconet requirements
• Therefore, receiver chains can be time-multiplexed.
May 2003
Jonathon Cheah, femto Devices
Inc.
9
Simple Length 11 Orthonormal TimeFrequency code set





Orthonormality defined as:
T
 8


f 

1



f( t )
 d t

0
an d



T
2

f( t )
 dt
1
1
1
May 2003
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1
Jonathon Cheah, femto Devices
Inc.
10
Wake-up /beacon
• As the basic receiver structure is complicated, it
consumes biggest portion of total DC power. it is
desirable to have it off at all time.
• Borrow Satellite low detection error Unique Word
technique and energy detection to wake-up and
provide bit timing.
• Propose Maury-Styles length-30 Unique Word
• 111110101111001100110100000000
• The Unique Word is transmitted in OOK to
permit energy detection.
May 2003
Jonathon Cheah, femto Devices
Inc.
11
Receiver Chain
• 4 receiver chains are needed.
• Pulse repetitive per channel of 8 can be timemultiplexed by 2.
• Each receiver chain processes signal according
to Time-Frequency code set.
• Each receiver chain consists of a 2-finger Rake
and a Equalizer
• Simplified Matlab simulation files will be
provided on request to show that pulse repetitive
rate of 4 per channel is sufficient to cope with
CM1 to CM4 response.
May 2003
Jonathon Cheah, femto Devices
Inc.
12
Receiver block diagram
LNA
Wake-up/bittiming
EnergyDetect
"Xtal-set"
System-on
RX
bit-timing
Quadrature
Demod
Time-Freq
coder
May 2003
ref: March submission
2-finger
2-finger
2-finger
Rake
Rake
Rake
Rake
DFE
DFE
DFE
Equalizer
Data
Decision
MAC
SDC
Jonathon Cheah, femto Devices
Inc.
13
Each receiver chain
Adaptiv ealgorithm
(MMSE)
BPSK Demodside
Error
+
A/D
RAKEReceiv er
Two f ingers
Feed f orward
equalizer
Decoded
bits
+
Run
Train
EstimatedMultipath
coef f icients
&
delay s
Training
Sequence
Decisionf eedback
equalizer
Swept Delay
Correlator
May 2003
Jonathon Cheah, femto Devices
Inc.
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Mode Of Operation
• The receiver is normally off, with only
“energy detection xtal set” on.
• On receipt of UW sequence, receiver is
turned on with bit-timing sync.
• BPSK demod is on with non-coherent
differential detection, therefore carrier
recovery is not necessary.
• T-F coder coordinates the reception. MAC
layer determines the default channel.
May 2003
Jonathon Cheah, femto Devices
Inc.
15
Channel Response Performance
May 2003
Jonathon Cheah, femto Devices
Inc.
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Link Budget Table
May 2003
Ch1
Ch8
Ch1
Ch8
Throughput
100
100
480
480
Over-the-air bit rate
275
275
1320
1320
PRF rate
11
11
11
11
Average TX power (PT) dBm
-3.5
-0.5
0
0
Tx Antenna gain (GT) dBi
0
0
0
0
fc: center frequency of waveform Ghz
4.0
9.6
4.0
9.6
Path loss at 1 meter (L1) dB
44.5
52.1
44.5
52.1
Path loss at d meter (L2) dB
20
20
20
20
Rx antenna gain (GR) dBi
0
0
0
0
Rx Power (PR = PT+GT+GR-L1-L2) dBm
-68
-72.6
-64.6
-72.2
Noise bandwidth at antenna port (Mhz)
800
800
800
800
Noise Power (N = -174 + 10*log(Rb)) dBm
-89.6
-89.6
-82.8
-82.8
Rx Noise Figure (NF) dB
7
7
7
7
Rx Noise Power (PN = N+NF) dBm
-82.6
-82.6
-75.8
-75.8
Processing Gain (PG)
1
1
1
1
Minimum C/N (S) dB
6
6
6
6
Link Margin (M = PR + PG –PN- S)
5.6
1.0
2.2
-5.4
Proposed Minimum Rx sensitivity level dBm
-75
-75
-75
-75
Jonathon Cheah, femto Devices
Inc.
17
Link Budget calculation example for
030505a
U WB Link Budget
ref : 02490r0P802-15_SG3a-C hannel-Modeling-Subc om mitt ee-R eport -Final. doc
6
Throughput
Rb   1 32 01
 0
c hannel f requenc y
fc   4 1 0
c hannel BW (10dB)
Cb w   ( 2 Rb) i f 2 .Rb  1 20 01
 0
9
6
9
6
( 4 Rb) i f fc  6 .4 1 0  2 . Rb  1 20 01
 0
6
1 20 01
 0 o th erw ise
dist ance
d  10
band repeatativ e rat e
P RF  1 1
Av erage TX power
P t   4 1.3  1 0 l og Cb w 1 0
TX power reduct ion
P p rf   1 0l og( P RF)
Tot al av earge TX power
P av g   P t  P p rf

P av g  0 .09 4
Path loss 1 m
 4  fc
L1   2 0 l og
8
 3 1 0



Path Los s
L2   2 0 l og( d )
R X power
P r   P av g  G t  G r  L1  L2
6

TX gain
G t  0
R X gain
G r  0
Eb/N o
S  10
I mplement at ion Los s I   3
C onv olution R at e 1/ 2 C   4
P r  6 4.5 77
Av erage N oise per bit N   1 74  1 0 l og( Rb)
N ois e Figure
Margin
N  8 2.7 94
Nf 7
P r  6 4.5 77
Pn N  Nf
P n  7 5.7 94
M  Pr Pn  S  I  C
M  2 .21 7
May 2003
Jonathon Cheah, femto Devices
Inc.
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