doc.: ieee 15-05-0030-01-004a project: ieee p802.15 ... · january 2005 slide 1 chia-chin chong,...
TRANSCRIPT
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 1
doc.: IEEE 15-05-0030-01-004a
Submission
Project: IEEE P802.15 Working Group for Wireless Personal Area NProject: IEEE P802.15 Working Group for Wireless Personal Area Networks (etworks (WPANsWPANs))
Submission Title: [Samsung Electronics (SAIT) CFP Presentation]Date Submitted: [January, 2005]Source: [(1) Chia-Chin Chong, Su Khiong Yong, Young-Hwan Kim, Jae-Hyon Kim, Seong-Soo Lee
(2) A. S. Dmitriev, A. I. Panas, S. O. Starkov, Yu. V. Andreyev, E. V. Efremova, L. V. Kuzmin(3) Haksun Kim, Jaesang Cha]
Company: [(1) Samsung Electronics Co., Ltd. (Samsung Advanced Institute of Technology (SAIT))(2) Institute of Radio Engineering and Electronics (IRE)(3) Samsung Electro-Mechanics Co., Ltd.]
Address: [(1) RF Technology Group, Comm. & Networking Lab., P. O. Box 111, Suwon 440-600, Korea.(2) Russian Academy of Sciences, 11 Mokhovaya Street, Moscow 103907, Russia Federation.(3) 314, Maetan-3Dong, Youngtong-Gu, Suwon, Gyeonggi-Do, Korea 443-743]
Voice: [+82-31-280-6865], FAX: [+82-31-280-9555], E-Mail: [[email protected]]Re: [Response to IEEE 802.15.4a Call for Proposals (04/380r2)]
Abstract: [Proposal for the IEEE 802.15.4a PHY standard based on the UWB direct chaotic communications technology.]
Purpose: [Proposal for the IEEE 802.15.4a 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.
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 2
doc.: IEEE 15-05-0030-01-004a
Submission
Samsung Electronics (SAIT) CFP Presentation for IEEE 802.15.4a
Alternative PHY
Presented by:
Chia-Chin ChongSamsung Advanced Institute of Technology
(SAIT), Korea
UWB Direct Chaotic Communication System
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 3
doc.: IEEE 15-05-0030-01-004a
Submission
Outline• Characteristics of Chaotic Signal• Principle of Direct Chaotic Communications (DCC)• PHY Layer Proposal• System Performance• Simultaneously Operating Piconets (SOP)• Ranging Technique• Power Consumption & Power Management Modes• Link Budget & Sensitivity• Complexity, Cost & Technical Feasibility • Scalability• Self-Evaluation• Conclusion
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 4
doc.: IEEE 15-05-0030-01-004a
Submission
Characteristics of Chaotic Signal (1)
• Simple circuits– Chaotic signal can be generated directly into the desired microwave band
by a chaotic generator
• Low cost implementation– The simple circuit leads to low cost product
• Multipath resistance– Wideband signal is very immune against multipath fading
• Good spectral properties– Non-periodic with a flat (or tailored) spectrum
• Flexibility– Chaotic radio pulse with different time duration can have the same
bandwidth
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 5
doc.: IEEE 15-05-0030-01-004a
Submission
Characteristics of Chaotic Signal (2)
Time, ns
Am
plitu
de
Time, nsTime, ns
Am
plitu
de
Frequency, GHz
PSD
, dB
Frequency, GHzFrequency, GHz
PSD
, dB
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 6
doc.: IEEE 15-05-0030-01-004a
Submission
Characteristics of Chaotic Signal (3)
f
S(f)
∆f
T
3T
t
t
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 7
doc.: IEEE 15-05-0030-01-004a
Submission
Direct Chaotic Communication (DCC)
• Chaotic source generates oscillations directlyin a specified microwave band.
• Information component is put into the chaotic carrier using a stream chaotic radio pulses.
• Information is retrieved from the chaotic radio pulses without intermediate heterodyning.
• Most simple non-coherent receiver is used.
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 8
doc.: IEEE 15-05-0030-01-004a
Submission
Direct Chaos Generator
Binary Information
Frequency Spectrum
Time Signal
Chaotic Radio Pulse
Direct Chaotic Signal Generation
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 9
doc.: IEEE 15-05-0030-01-004a
Submission
Oscillator circuit
Experiment device
Chaotic Generator Model
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 10
doc.: IEEE 15-05-0030-01-004a
Submission
Mathematical Model• System of 1st and 2nd order differential equations
with 4.5 degrees of freedom
45525555
34424444
23323333
1222
22222
511 )(
xxxx
xxxx
xxxx
xxxx
xmFxxT
α=ω+α+
α=ω+α+
α=ω+α+
ω=ω+α+
=+
System Equations Runge-Kutta Method
y(1) = (m*Fx5 - X1)/T; y(2) = W1*W1*(X1- X3);y(3) = X2 - A1*X3;y(4) = A2*y3-W2*W2*X5;y(5) = X4 - A2*X5;y(6) = A3*y(5)-W3*W3*X7;y(7) = X6 - A3*X7;y(8) = A4*y(7)-W4*W4*X9;y(9) = X8 - A4*X9;
⎥⎦
⎤⎢⎣
⎡ +−−+−−+=
2)( 22
11
ezezezezMzFNonlinearity
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 11
doc.: IEEE 15-05-0030-01-004a
Submission
Outline• Characteristics of Chaotic Signal• Principle of Direct Chaotic Communications (DCC)• PHY Layer Proposal• System Performance• Simultaneously Operating Piconets (SOP)• Ranging Technique• Power Consumption & Power Management Modes• Link Budget & Sensitivity• Complexity, Cost & Technical Feasibility • Scalability• Self-Evaluation• Conclusion
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 12
doc.: IEEE 15-05-0030-01-004a
Submission
31 2 4 5 6 7 8 9 10 11Freq, GHz
Pow
erSp
ectr
um, d
Bm
/MH
z
FCC Spectrum Mask for UWB
5 GHzWLAN
2.4 GHzWLAN,
Bluetooth
-41.325
GPS0.96-1.61
Frequency Band Plan (1)
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 13
doc.: IEEE 15-05-0030-01-004a
Submission
Frequency Band Plan (2)
• Operating Frequency: 3.1–5.1 GHz• Why Lower Band?
– Limitation in the technical capabilities of integrated circuit implementation at higher frequency.
– Limit of low cost ICs beyond 6 GHz.– Prevent interference with 5 GHz WLAN band.– Use as much bandwidth as possible to maximize the emitted
power and follows FCC rules i.e. >500MHz.• Can be easily change to use higher band if
necessary or when cheap technologies available in the future.
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 14
doc.: IEEE 15-05-0030-01-004a
Submission
3 4 5Freq,GHz
3 4 5Freq,GHz
Subband fc, GHz fL, GHz fR, GHz1 3,35 3,1 3,62 3,85 3,6 4,13 4,35 4,1 4,64 4,85 4,6 5,1
• 500 MHz bandwidth at –10 dB• Spaced 500 MHz away
4 sub-bands for 4 simultaneously operating piconets (SOPs)
Frequency Band Plan (3)
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 15
doc.: IEEE 15-05-0030-01-004a
Submission
FCC UWB Emission Mask
Frequency, GHz
UW
B E
IRP
Emis
sion
Lev
el in
dB
m
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 16
doc.: IEEE 15-05-0030-01-004a
Submission
Modulation Schemes
• Various modulation schemes can be deployed:– On-off-keying (OOK)– Differential-chaos-shift-keying (DCSK)– Pulse-position modulation (PPM)
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 17
doc.: IEEE 15-05-0030-01-004a
Submission
Why OOK ?
• Advantages:– It has less complexity– It has 3 dB more energy efficiency than
DCSK → battery saving• Disadvantages:
– It requires non-zero threshold
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 18
doc.: IEEE 15-05-0030-01-004a
Submission
0 5 10 15 20 25 300
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08Power distribution at 10 m
Power
0 2 4 6 8 10 120
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08Power distribution at 20 m
Power
0 2 4 6 8 10 120
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08Power distributions at 30 m
Power
Threshold Estimation
Once set, threshold is constant!
Constant threshold
“0”
“0”
“0”
“1”
“1”
“1”
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 19
doc.: IEEE 15-05-0030-01-004a
Submission
DCC-OOK Transmitter & Receiver
Direct Chaos Generator
…1001011
ReceiverTransmitter
Threshold decision
(…)2
Envelope detector
MultipathChannel
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 20
doc.: IEEE 15-05-0030-01-004a
Submission
DCC-OOK Transceiver Architecture (1)
• Very simple modulation scheme: on-off power supply is used for modulation
• Additional power saving
Baseband
Processor
MA
C
SRAM
TX RF Part
ADC
1 7;
2 6;
12 3
75
5
4
3
4
6RX RF Part
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 21
doc.: IEEE 15-05-0030-01-004a
Submission
DCC-OOK Transceiver Architecture (2)
Transmitter RF Part
Receiver RF Part
Chaotic Oscillator
Piconet Filter
Power Amplifier
To switch
EnvelopeDetector
Piconet Filter LNA
From switch
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 22
doc.: IEEE 15-05-0030-01-004a
Submission
0 2 4 6 8 10-60
-50
-40
-30
-20
-10
0
Frequency [GHz]
Nor
mal
ized
Pow
er S
pect
ral D
ensi
ty0 0.5 1 1.5 2 2.5 3 3.5 4
x 10-6
-5
-4
-3
-2
-1
0
1
2
3
4
Time (s)
Am
plitu
de
Signal Waveforms and Spectrum
0 20 40 60 80 100 120 140 160 180 200-1.5
-1
-0.5
0
0.5
1
1.5
Time, t [ns]
Am
plitu
de
0 5 10 15-60
-50
-40
-30
-20
-10
0
Frequency [GHz]
Nor
mal
ized
Pow
er S
pect
ral D
ensi
ty
Signal of chaotic generator
OOK modulated signal
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 23
doc.: IEEE 15-05-0030-01-004a
Submission
Data Frame Structure
PPDU
Octets:
PHY Layer
PreambleSequence
4 1
FrameLength
SFD
1
SHR PHR PSDU
MPDU
32
FrameControl
AddressField
Data Payload FCS
Octets: 2 1 4-20 2
MAC Sublayer
n
MHR MSDU MFR
38Octets:
MHR : MAC Header
MFR : MAC Footer
SHR : Synchronization Header
PHR : PHY HeaderSeq.No.
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 24
doc.: IEEE 15-05-0030-01-004a
Submission
Payload Bit Rate (1)
Preamble SFD PHR PSDU
4 + 1 + 1 Bytes 32 Bytes
1 0bits
Ts
Tm
Ts = 100 ns : Pulse emission time
Tm = 400 ns : Pulse bin width or
Bit period
∴ Duty cycle, D = 1/4Tm
PPDU (38 Bytes)
Nominal PHY-SAP payload bit rate, X0 = (1/400ns)×(1000/1024) = 2.44Mbps
Ts
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 25
doc.: IEEE 15-05-0030-01-004a
Submission
Data Throughput (1)
Data Frame 1 (38 bytes) Data Frame 2 (38 bytes)ACK (11 bytes)
t ACK LIFS
Time for acknowledged transmission, tpacket
tpacket = tdata-frame + t ACK + t ACK-frame + LIFS= (38×8×400ns) + (32×400ns) + (11×8×400ns) + (40×400ns)= 121.6µs + 12.8µs + 35.2µs + 16µs= 185.6µs
t data-frame t ACK-frame
Nominal Data Throughput, T0 = (32×8/185.6µs)×(1000/1024) = 1.35Mbps
…
Packet 1
40 bits32 bits
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 26
doc.: IEEE 15-05-0030-01-004a
Submission
Payload Bit Rate (2)
Preamble SFD PHR PSDU
4 + 1 + 1 Bytes 32 Bytes
1 0bits
Ts
Tm
Ts = 100 ns : Pulse emission time
Tm = 600 ns : Pulse bin width or
Bit period
∴ Duty cycle, D = 1/6Tm
Ts
PPDU (38 Bytes)
Optional PHY-SAP payload bit rate, Xi = (1/600ns)×(1000/1024) = 1.63Mbps
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 27
doc.: IEEE 15-05-0030-01-004a
Submission
Data Throughput (2)
Data Frame 1 (38 bytes) Data Frame 2 (38 bytes)ACK (11 bytes)
t ACK LIFS
Time for acknowledged transmission, tpacket
tpacket = tdata-frame + t ACK + t ACK-frame + LIFS= (38×8×600ns) + (32×600ns) + (11×8×600ns) + (40×600ns)= 182.4µs + 19.2µs + 52.8µs + 24µs= 278.4µs
t data-frame t ACK-frame
Optional Data Throughput, Ti = (32×8/278.4µs)×(1000/1024) = 898kbps
…
Packet 1
40 bits32 bits
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 28
doc.: IEEE 15-05-0030-01-004a
Submission
Example of Operation at 1 kbps (1)
• There are 2 methods of operation in order to achieve 1 kbps data rate:1. The device transmits several packets in
succession, so that the overall data volume is 1kbit i.e. 1024 bits, then falls silent till the beginning of the next second.
2. The device transmits one packet of data at a time with long pauses between the packets, so that total data volume over 1 second is 1kbit. In the beginning of the next second the device wakes up and transmits another 1kbit portion of data.
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 29
doc.: IEEE 15-05-0030-01-004a
Submission
Example of Operation at 1 kbps (2)
tpacket
Packet 1 Packet 2 Packet 3 Packet 4
1024 bits in 1 second
tidle-1kbps
• To achieve effective data rates of 1 kbps using 32-bytes PSDU, 4 packets need to be transmitted in 1 second.
• The idle time for the above system is tidle-1kbps ≈ 250 ms.
tidle-1kbps tidle-1kbps tidle-1kbps
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 30
doc.: IEEE 15-05-0030-01-004a
Submission
Data Rates and Range
System supports data rates:• 1 kbps• 10 kbps• 1 Mbps• 40 kbps (optional)• 160 kbps (optional)• Aggregated bit rate up to 5 Mbps
System supports ranges:• Range from 0 to 30 m (typical)• Range up to 100 m (max 10 kbps data rate)
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 31
doc.: IEEE 15-05-0030-01-004a
Submission
Outline• Characteristics of Chaotic Signal• Principle of Direct Chaotic Communications (DCC)• PHY Layer Proposal• System Performance• Simultaneously Operating Piconets (SOP)• Ranging Technique• Power Consumption & Power Management Modes• Link Budget & Sensitivity• Complexity, Cost & Technical Feasibility • Scalability• Self-Evaluation• Conclusion
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 32
doc.: IEEE 15-05-0030-01-004a
Submission
System Simulation Parameters
• Modulation: OOK• Bandwidth: 0.5GHz & 2GHz• Pulse bin width, Tm: 400ns• Pulse emission time, Ts: 100ns• PSDU length: 32 bytes
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 33
doc.: IEEE 15-05-0030-01-004a
Submission
AWGN Performance: BER vs. Eb/N0
10 12 14 16 18 2010
-6
10-4
10-2
100
Eb/N0, [dB]
BER
OOK Modulation Scheme
B=0.5 GHz, uncodedB=2 GHz, uncodedB=0.5 GHz, Hamming (7,4)B=2 GHz, Hamming (7,4)
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 34
doc.: IEEE 15-05-0030-01-004a
Submission
AWGN Performance: PER vs. Eb/N0
10 12 14 16 18 2010
-4
10-3
10-2
10-1
100
Eb/N0, [dB]
PER
OOK Modulation Scheme
B=0.5 GHz, uncodedB=2 GHz, uncodedB=0.5 GHz, Hamming (7,4)B=2 GHz, Hamming (7,4)
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 35
doc.: IEEE 15-05-0030-01-004a
Submission
Multipath Performance: BER vs. Eb/N0 (1)
5 10 15 20 2510
-8
10-6
10-4
10-2
100
Eb/N0, dB
BER
2 GHz Bandwidth
AWGNResidential LOS (CM1)Open outdoor LOS (CM5)Industrial NLOS (CM8)
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 36
doc.: IEEE 15-05-0030-01-004a
Submission
Multipath Performance: BER vs. Eb/N0 (2)
0 5 10 15 20 2510
-8
10-6
10-4
10-2
100
Eb/N0, dB
BER
0.5 GHz Bandwidth
AWGNResidential LOS (CM1)Open outdoor LOS (CM5)Industrial NLOS (CM8)
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 37
doc.: IEEE 15-05-0030-01-004a
Submission
Multipath Performance: PER vs. Eb/N0 (1)
5 10 15 20 2510
-4
10-3
10-2
10-1
100
Eb/N0
PER
2 GHz Bandwidth
AWGNResidential LOS (CM1)Open outdoor LOS (CM5)Industrial NLOS (CM8)
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 38
doc.: IEEE 15-05-0030-01-004a
Submission
Multipath Performance: PER vs. Eb/N0 (2)
0 5 10 15 20 2510
-4
10-3
10-2
10-1
100
Eb/N0
PER
0.5 GHz Bandwidth
AWGNResidential LOS (CM1)Open outdoor LOS (CM5)Industrial NLOS (CM8)
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 39
doc.: IEEE 15-05-0030-01-004a
Submission
Outline• Characteristics of Chaotic Signal• Principle of Direct Chaotic Communications (DCC)• PHY Layer Proposal• System Performance• Simultaneously Operating Piconets (SOP)• Ranging Technique• Power Consumption & Power Management Modes• Link Budget & Sensitivity• Complexity, Cost & Technical Feasibility • Scalability• Self-Evaluation• Conclusion
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 40
doc.: IEEE 15-05-0030-01-004a
Submission
SOP
• Three methods to achieve SOP:1. Frequency division multiplexing (FDM)
• Four independent frequency channels of 500 MHz bandwidth.• This gives simultaneously operating of four piconets.
2. Code division multiplexing (CDM)• Deployed a class of unipolar codes (0,1) having ZCD/LCD
property → maintain orthogonality among piconets.• Four set of codes can support four simultaneously operating
piconets.3. Frequency-code division multiplexing (FCDM)
• Two independent frequency channels with 1 GHz bandwidth each and within each frequency channel, a set of codes is used similar to CDM technique.
• A lower set of codes require to support four simultaneously operating piconets.
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 41
doc.: IEEE 15-05-0030-01-004a
Submission
3 4 5Freq,GHz
3 4 5Freq,GHz
Subband fc, GHz fL, GHz fR, GHz1 3,35 3,1 3,62 3,85 3,6 4,13 4,35 4,1 4,64 4,85 4,6 5,1
• 500 MHz bandwidth at –10 dB• Spaced 500 MHz away
4 sub-bands for 4 simultaneously operating piconets (SOPs)
SOP: FDM
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 42
doc.: IEEE 15-05-0030-01-004a
Submission
SOP: CDM (1)
t
Unipolar Code4
Tx1(Desired user)
Rx1
Spreadingt
Chaotic Source
OOK Modulation
RadioChannel
LNABPFMatched FilterRecovered DATA
Detection
t
Tx1
Tx4
0 1 0 0 1 1 0tUnipolar DATA
1 0 0 1 0 1 0 tUnipolar DATA Spreading
t
Chaotic Source
OOK Modulation
Code1:Piconet1Code2:piconet2Code3:piconet3Code4:piconet4
CDM
t
10
Unipolar Code1
0 1 0 0 1 1 0t
Envelope Detector
Baseband
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 43
doc.: IEEE 15-05-0030-01-004a
Submission
SOP: CDM (2)Baseband Implementation in LABVIEW
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 44
doc.: IEEE 15-05-0030-01-004a
Submission
SOP: CDM (3)Chaotic Source Generator in LABVIEW
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 45
doc.: IEEE 15-05-0030-01-004a
Submission
3 4 5Freq,GHz
• 1 GHz bandwidth for each sub-band.
2 sub-bands and a set of PN code for each sub-bands => 4 simultaneously operating piconets (SOPs)
SOP: FCDM
ChaoticSource
Subband fc, GHz fL, GHz fR, GHz1 3.6 3.1 4.12 4.6 4.1 5.1
3 4 5Freq,GHz 3 4 5
Freq,GHz
A Set of PN Code
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 46
doc.: IEEE 15-05-0030-01-004a
Submission
Outline• Characteristics of Chaotic Signal• Principle of Direct Chaotic Communications (DCC)• PHY Layer Proposal• System Performance• Simultaneously Operating Piconets (SOP)• Ranging Technique• Power Consumption & Power Management Modes• Link Budget & Sensitivity• Complexity, Cost & Technical Feasibility • Scalability• Self-Evaluation• Conclusion
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 47
doc.: IEEE 15-05-0030-01-004a
Submission
Ranging Scheme (1)
• Ranging circuit contains 2 low frequency generators with slightly different frequency to generate probing pulses, f0 (2.500 MHz) & reference pulses, f1=f0+∆f (2.5125 MHz).
• Circuit also contains 3 counters that count the no. of reference pulses, N3, no. of delayed pulses from the channel, N1 and no. of overlapping pulses, N2.
• Range is determined from the reading of the 3 counters.
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 48
doc.: IEEE 15-05-0030-01-004a
Submission
Ranging Scheme (2)
yes
yes
yes
no
start both pulse sources & counter N3
no
1st delayed pulse?
start counter N1
1st overlap match?
stop N1 & N3, start N2
last overlap match?
no
stop N2, calculate TTOA
•Counter N1 counts delayed pulses
•Counter N2 counts overlaps between delayed pulses (f0=2.5000 MHz) and reference pulses (f1=2.5125 MHz)
•Counter N3 counts reference pulses
2.5125 MHz Pulse source
2.5000 MHz Pulse source
N3 N1
Overlap detector
N2
delay
Digital Block
20 MHzClock source
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 49
doc.: IEEE 15-05-0030-01-004a
Submission
Overlapping of Delayed & Reference Pulses
Delayed pulse
Reference pulse
Overlapped pulse
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 50
doc.: IEEE 15-05-0030-01-004a
Submission
Ranging Scheme (3)
t0 t1 t2 t3
С1
С2
С3
TTOA
N1
N2
N3
TTOA= (N3+0.5∗N2)/f1 –(N1+0.5∗N2)/f0
Distance:S = 0.5*c*(TTOA-τ0)
N1, N2, N3 –Number of pulses
τ0 – retranslation time
Operation time of counters C1, C2, C3.
t**
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 51
doc.: IEEE 15-05-0030-01-004a
Submission
Outline• Characteristics of Chaotic Signal• Principle of Direct Chaotic Communications (DCC)• PHY Layer Proposal• System Performance• Simultaneously Operating Piconets (SOP)• Ranging Technique• Power Consumption & Power Management Modes• Link Budget & Sensitivity• Complexity, Cost & Technical Feasibility • Scalability• Self-Evaluation• Conclusion
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 52
doc.: IEEE 15-05-0030-01-004a
Submission
Power Consumption (1)
Tx
RxCU
Transceiver
Pe is emitted power, η is efficiency,ηbest is the best of all possible efficiencies,
Pin is instantaneous emission power, Te is time of emission for given transmission rate,
Tbit is duration of one bit, R is transmission rate,Cb is battery capacity,
Ub is battery voltage,
D is duty cycle.
Operation time Toper
ControlUnit
Toper = Cb · Ub / Pav
Pav = PTx + PRx + PCU
PTx = Pe / η PRx = Pe / ηbest
Pe = Pin · Te = 1/2 · D · Pin · Tbit · R
Average power consumption Pav
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 53
doc.: IEEE 15-05-0030-01-004a
Submission
16.40.1% duty cycle8 mW2·10-11000
1510% duty cycle87.5 µW2·10-310
8.3100% duty cycle15.5 µW2·10-41
Lifetime of the AAA battery, years
Average Power Consumption Pav
(η = 5%)
Average Emitted Power
Pe, mW
Transmission Rate R, kbps
PCU = 7.5 µW ; Ub = 1.5 V ; Cb = 750 mAh;
Example:Pin = 4 mW ; ηbest = 5%;
R = 1 kbps; Tbit = 400 ns; η = 5%
Pe = 1/2 · D · Pin · Tbit · R = 0.2 µW
Pav = PTx + PRx + PCU = Pe /η + Pe /ηbest + PCU = 15.5 µW
Power Consumption (2)
D = 1/4
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 54
doc.: IEEE 15-05-0030-01-004a
Submission
Power Management Modes
Wake Up Radio
MainTransceiver / Receiver
Detector
Power
Wake Up StructureWake Up Signal
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 55
doc.: IEEE 15-05-0030-01-004a
Submission
Outline• Characteristics of Chaotic Signal• Principle of Direct Chaotic Communications (DCC)• PHY Layer Proposal• System Performance• Simultaneously Operating Piconets (SOP)• Ranging Technique• Power Consumption & Power Management Modes• Link Budget & Sensitivity• Complexity, Cost & Technical Feasibility • Scalability• Self-Evaluation• Conclusion
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 56
doc.: IEEE 15-05-0030-01-004a
Submission
Link Budget & Sensitivity
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 57
doc.: IEEE 15-05-0030-01-004a
Submission
Outline• Characteristics of Chaotic Signal• Principle of Direct Chaotic Communications (DCC)• PHY Layer Proposal• System Performance• Simultaneously Operating Piconets (SOP)• Ranging Technique• Power Consumption & Power Management Modes• Link Budget & Sensitivity• Complexity, Cost & Technical Feasibility• Scalability• Self-Evaluation• Conclusion
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 58
doc.: IEEE 15-05-0030-01-004a
Submission
ChaoticGenerator
Piconet Filter
Modulator(OOK)
Power Amplifier
information
AntennaSwitch
Low NoiseAmplifier
Piconet Filter
Detector( ⋅ )2
Low PassfilterRecover
Information
ProbingGenerator
2.5000 MHz
ReferenceGenerator
2.5125 MHzCounter 3
Counter 1
Counter 2
DSPBlock
Baseband (Digital)
RangingArchitectureRange
RF PHY
MACTransceiver Architecture
Wake up
Sleep
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 59
doc.: IEEE 15-05-0030-01-004a
Submission
Unit Manufacturing Cost & Complexity (1)
• RF part of the transceiver:– Chaos oscillator in 3.1-5.1 GHz frequency band
with 10 dBm output power amplifier (common complexity is equivalent to 4 power amplifiers)
– Switch-modulator – LNA (amplification 30-35 dB)– Tunable filter with bandwidth 500 MHz (in band
3.1-5.1 GHz)– Envelope detector– Antennas– No: mixers, correlators, RF VCO
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 60
doc.: IEEE 15-05-0030-01-004a
Submission
Unit Manufacturing Cost & Complexity (2)
• Baseband part of the transceiver:– Reference oscillator – 40 MHz– Bandpass amplifiers– Threshold detector or 4 bit A/D converter– Frequency Synthesizer on 2.5125 MHz (for
ranging)– Digital part with ~ 10K gates
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 61
doc.: IEEE 15-05-0030-01-004a
Submission
Size & Form Factor
PHY–level (0.13µm CMOS technology)
• RF part of transceiver < 0.3 mm2
• Analog part of transceiver PHY–level baseband < 0.2 mm2
• Digital part of transceiver PHY–level baseband < 0.3 mm2
____________________________________________________• Common layout square for PHY-level < 1.0 mm2
• Antenna: 2.0 x 2.0 cm2
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 62
doc.: IEEE 15-05-0030-01-004a
Submission
Technical Feasibility (1)
UWB DCC-OOK Test-bed
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 63
doc.: IEEE 15-05-0030-01-004a
Submission
Technical Feasibility (2)
DCC-OOK Experiment: 3.1-5.1 GHz
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 64
doc.: IEEE 15-05-0030-01-004a
Submission
Technical Feasibility (3)
Transmitter consists of:- chaos generator
- modulator- antenna
Frequency band - 3.1-5.1 GHz
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 65
doc.: IEEE 15-05-0030-01-004a
Submission
Outline• Characteristics of Chaotic Signal• Principle of Direct Chaotic Communications (DCC)• PHY Layer Proposal• System Performance• Simultaneously Operating Piconets (SOP)• Ranging Technique• Power Consumption & Power Management Modes• Link Budget & Sensitivity• Complexity, Cost & Technical Feasibility• Scalability• Self-Evaluation• Conclusion
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 66
doc.: IEEE 15-05-0030-01-004a
Submission
Scaling Parameters• Scalability is the tradeoff between
– Bit rate– Power consumption– Range– Complexity/Cost
• PHY mechanisms used– Transmit power control– Dynamic frequency selection
• Invoked if link quality falls below some threshold• Example applications:
– Home usage/smart home (1kbps - 20 to 30m)– Communication and networking (1kbps - 20 to 30m)– etc.
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 67
doc.: IEEE 15-05-0030-01-004a
Submission
What can be scaled?• Power consumption:
– Bandwidth used– Data rate, duty cycle and distance of operation– Packet transmission followed by sleep mode
• Data rate:– Scalable from 1 kbps to 1 Mbps
• Range:– Scalable with coding, lower bit duration (up to the optimum
value) and power consumption.• Complexity:
– Lower complexity is possible with trade-off of reduced system performance
– Scale with future CMOS process improvements e.g. use upper frequency band
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 68
doc.: IEEE 15-05-0030-01-004a
Submission
Outline• Characteristics of Chaotic Signal• Principle of Direct Chaotic Communications (DCC)• PHY Layer Proposal• System Performance• Simultaneously Operating Piconets (SOP)• Ranging Technique• Power Consumption & Power Management Modes• Link Budget & Sensitivity• Complexity, Cost & Technical Feasibility • Scalability• Self-Evaluation• Conclusion
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 69
doc.: IEEE 15-05-0030-01-004a
Submission
Self-Evaluation
+A5.11Power Consumption
+A5.10Power Management & Modes
+A5.9Sensitivity
+A5.8Link Budget
+A5.7Ranging
+A5.6System Performance
+A5.4Simultaneous Operating Piconets
+A5.3.1PHY-SAP Payload Bit Rate and Data Throughput
+A5.2Size and Form Factor
+A3.5Scalability
+A3.4Technical Feasibility
+A3.1Unit Manufacturing Complexity
Proposer ResponseImportance LevelRef.Criteria
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 70
doc.: IEEE 15-05-0030-01-004a
Submission
Outline• Characteristics of Chaotic Signal• Principle of Direct Chaotic Communications (DCC)• PHY Layer Proposal• System Performance• Simultaneously Operating Piconets (SOP)• Ranging Technique• Power Consumption & Power Management Modes• Link Budget & Sensitivity• Complexity, Cost & Technical Feasibility • Scalability• Self-Evaluation• Conclusion
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 71
doc.: IEEE 15-05-0030-01-004a
Submission
Conclusions
• Chaotic communications meet the low power, low cost & low complexity requirements →best suited for 15.4a applications.
• Proposed DCC-OOK compliant with FCC UWB PSD regulation.
• Feasibility and scalability are guaranteed with precision ranging and SOP capabilities.
• The implemented test bed demonstrated that the feasibility of DCC technology.
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 72
doc.: IEEE 15-05-0030-01-004a
Submission
DCSK: Compatible Modulation Scheme for Direct Chaotic Communication
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 73
doc.: IEEE 15-05-0030-01-004a
Submission
Outline• General Overview• Characteristics of DCSK • Principle of Differential Chaotic Shift Keying
(DCSK) Modulation• Simultaneously Operating Piconets (SOP)• Ranging Technique• Scalability• Complexity, Cost & Technical Feasibility• Link Budget & Sensitivity• Conclusion
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 74
doc.: IEEE 15-05-0030-01-004a
Submission
General Overview
• Direct chaotic signal can be applied to the Differential Chaos Shift Keying (DCSK) modulation scheme as an alternative to OOK DCC
• The Chaotic properties are maintained as in the case of the OOK
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 75
doc.: IEEE 15-05-0030-01-004a
Submission
Characteristics of DCSK
• Direct Chaotic Shift Keying (DCSK)– same data rate as in the proposed OOK– Constant decision threshold in the receiver– SOP can be achieved by transmitting
different chaotic pulse length
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 76
doc.: IEEE 15-05-0030-01-004a
Submission
Principle of DCSK Modulation(1)
• DCSK transmits a reference chaotic pulse and an information data pulse depending on whether information bit 1 (same ref. chaotic pulse) or 0 (inverted of the chaotic pulse) is being transmitted
• The information signal can be recovered by a correlator.
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 77
doc.: IEEE 15-05-0030-01-004a
Submission
Principle of DCSK Modulation (2)
Transmitter Receiver
Chaotic
Generator
Delay
T/2
-1
Data Bit Stream
Delay
T/2
Integrator
T/2
T
T/2
Threshold
4 6 8 10 12 14 16 1810-5
10-4
10-3
10-2
10-1
100
Eb/No
BE
R
OOKDCSK
4 6 8 10 12 14 16 1810-5
10-4
10-3
10-2
10-1
100
Eb/No
BE
R
OOK Vs DCSK
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 78
doc.: IEEE 15-05-0030-01-004a
Submission
SOP (1)
• In DCSK SOP can be done using Chaotic Length Division Multiple Access (LDMA).
• LDMA works based on the exploitation of different chaotic length assigned to each piconets.
• LDMA is based on the spectral and correlation property of chaotic signal.
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 79
doc.: IEEE 15-05-0030-01-004a
Submission
SOP (2)
0 1000 2000 3000 4000 5000 6000-5
0
5P iconet1
0 1000 2000 3000 4000 5000 6000-5
0
5P iconet2
0 1000 2000 3000 4000 5000 6000-5
0
5P iconet3
0 1000 2000 3000 4000 5000 6000-5
0
5P iconet4
0 1000 2000 3000 4000 5000 6000-10
0
10A ll
Piconet 1 Piconet 1
Piconet 1 User Piconet 1 User
Detection Detection
Piconet 2 Piconet 2
Piconet 3 Piconet 3
Piconet 4 Piconet 4
-20 -18 -16 -14 -12 -10 -8 -6 -4 -2 010-3
10 -2
10 -1
100
S /N
BE
R
4 Us ers
8M bps5M bps
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 80
doc.: IEEE 15-05-0030-01-004a
Submission
D D
TxTx
--11 D D
RxRx
dd
ΣΣ
oror
Data Bit StreamData Bit Stream D = Constant, d = VariableD = Constant, d = Variable
ChaoticChaoticSource Source
Variable Delay d
Chaotic DCSK Correlation Property
SOP (3)
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 81
doc.: IEEE 15-05-0030-01-004a
Submission
Ranging Technique
• Ranging technique used is the same as OOK proposal.
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 82
doc.: IEEE 15-05-0030-01-004a
Submission
Scalability (1)
• Scalability can be achieved using– Chaotic gain– Varying bit duration– Duty cycle– Repeated transmission of information
bearing chip.
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 83
doc.: IEEE 15-05-0030-01-004a
Submission
Chaotic Gain in DCSK
-20 -19 -18 -17 -16 -15 -14 -13 -12 -11 -1010
-3
10-2
10-1
100
S/N
BE
R
Gain
5Mbps4Mbps2Mbps0 1 0 0 0 2 0 0 0 3 0 0 0 4 0 0 0 5 0 0 0 6 0 0 0 7 0 0 0 8 0 0 0 9 0 0 0 1 0 0 0 0
- 5
0
5
0 1 0 0 0 2 0 0 0 3 0 0 0 4 0 0 0 5 0 0 0 6 0 0 0 7 0 0 0 8 0 0 0 9 0 0 0 1 0 0 0 0- 5
0
5
0 1 0 0 0 2 0 0 0 3 0 0 0 4 0 0 0 5 0 0 0 6 0 0 0 7 0 0 0 8 0 0 0 9 0 0 0 1 0 0 0 0- 5
0
5
Bit = 1 0
200 nsec
250 nsec
500 nsec
5 Mbps
4 Mbps
1 Mbps
1
Scalability (2)
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 84
doc.: IEEE 15-05-0030-01-004a
Submission
Scalability (3)
100 101 102 103 10410-5
10-4
10-3
10-2
10-1
100
Processing Gain
Erro
r Pro
babi
lity
5Mbps, 12dB1Mbps,10dB 5Mbps, 10dB1Mbps, 12dB
T
T
T
Duty Cycle
Repeated transmission
Bit duration
Scalability: varying bit duration
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 85
doc.: IEEE 15-05-0030-01-004a
Submission
Complexity, Cost & Technical Feasibility
• Complexity and cost will be slightly higher compare to the OOK chaotic system proposed
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 86
doc.: IEEE 15-05-0030-01-004a
Submission
Link Budget & Sensitivity
0.50.5Code rate
202Raw bit rate, kbps
44.544.5Path loss at 1 m (L1), dB
-109-119Rx sensitivity level, dB
11.511.5Link Margin at 30 m (M=PR-PN-S-I), dB
44Implementation loss (I), dB
1414Minimum Eb/No (S), dB
-127-137Total average noise power per bit (PN=N+NF), dBm
7.07.0Rx noise figure referred to the antenna terminal (NF), dB
-134.0-144.0Average noise power per bit (N=-174+10*log10(Rb)), dBm
-97.5-107.5Rx Power at 30 m (PR=PT+GT+GR-L1-L2), dBm
-3-3Rx antenna gain (GR), dB
00Tx antenna gain (GT), dB
3030Path loss at 30 m (L2), dB
3.353.35Geometric central frequency Fc, GHz
-20-30Average Tx Power (PT), dBm
-30-40Duty cyrcle, dB
101Throughput (Rb), Kbps
ValueValueParameter
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 87
doc.: IEEE 15-05-0030-01-004a
Submission
Conclusion
• Chaotic communication based on DCSK modulation is an alternative solution.
• SOP and ranging can also be solved using DCSK.
• Hardware complexity is slightly higher than OOK since most hardware from OOK is retained.
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 88
doc.: IEEE 15-05-0030-01-004a
Submission
Backup Slides
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 89
doc.: IEEE 15-05-0030-01-004a
Submission
Tolerance of Components (1)
• Tolerance of the components of the chaotic oscillator with insignificant changes of spectral properties are from 5%-20% for different components.
• However, it is possible to develop a chaotic oscillator with better tolerance of components.
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 90
doc.: IEEE 15-05-0030-01-004a
Submission
Tolerance of Components (2)
• Capacitor, C1 and inductance, L → 20% tolerance.
• C2 and resistors, RE and R1 → 5% tolerance.
E
C
Vampin Vampout VoutRR12R=50 Ohmv a_hp_MGA-66100_19930601
Amp1
CC20C=100 pF
DA_LCBandpassDT1_colp_collector_amp_f ltDA_LCBandpassDT1
Rl=50 OhmRg=50 OhmResponseTy pe=EllipticN=4As=40 dBAp=3 dBFs2=6 GHzFp2=5.1 GHzFp1=3.1 GHzFs1=2 GHz
DT
CC16C=C2 R
RE1R=RE
V_DCSRC2Vdc=VE
V_DCSRC1Vdc=VC
RRL1R=RL
LL10L=L
BFP620X3
CC17C=C1
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 91
doc.: IEEE 15-05-0030-01-004a
Submission
Summary of Features
Up to 5 MbpsAggregated bit rate
2.5 year0.1% duty
cycle
2.5 year10% duty
cycle
2.5 year100% duty
cycleBattery life
-20 dBm-20 dBm-30 dBmTransmit power
100 Kbps10 Kbps1 KbpsIndividual bit rate400 nsPulse duration
2.0 GHz band or 4 channels with 500 MHz in each in the 2 GHz bandChannel bandwidth
3 bands within FCC Mask(3.1-5.1, 6.1-8.1 and 8.2-10.2 GHz)Band division
Chaotic radio pulsesInformation carrier
January 2005
Chia-Chin Chong, Samsung Electronics (SAIT)Slide 92
doc.: IEEE 15-05-0030-01-004a
Submission
Tiny Chaos Transmitterfor Wireless Communications
Transmitter consists of:- chaos generator
- modulator- antenna
Frequency band - 2-4 GHzRadiating power - 3-4 mw