May11th 2005 Doc: IEEE 15-05-0250-00-004a Ismail Lakkis, Saeid Safavi, Wideband Access Inc....
11
TG4a May11th 2005 Doc: IEEE 15-05-0250-00- 004a Ismail Lakkis, Saeid Safavi, Wideband Access Inc. Slide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Networks (WPANs) Submission Title: [Revised Frequency Plan and PRF Proposal for TG4a] Date Submitted: [27 April 2005] Source: [Ismail Lakkis & Saeid Safavi, Wideband Access Inc.] Contact: Saeid Safavi. Voice:[+1 858 642 9114, E-Mail: [email protected]] Abstract: [Minimum required PRF for CMOS DS-UWB radios] Purpose: [Clarification of relationship between minimum PRF and maximum allowed voltage level in UWB IR] 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.
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Transcript of May11th 2005 Doc: IEEE 15-05-0250-00-004a Ismail Lakkis, Saeid Safavi, Wideband Access Inc....
TG4a
May11th 2005 Doc: IEEE 15-05-0250-00-004a
Ismail Lakkis, Saeid Safavi, Wideband Access Inc.
Slide 1
Project: IEEE P802.15 Working Group for Wireless Personal Area Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)Networks (WPANs)
Submission Title: [Revised Frequency Plan and PRF Proposal for TG4a]Date Submitted: [27 April 2005]Source: [Ismail Lakkis & Saeid Safavi, Wideband Access Inc.]Contact: Saeid Safavi.Voice:[+1 858 642 9114, E-Mail: [email protected]]Abstract: [Minimum required PRF for CMOS DS-UWB radios]Purpose: [Clarification of relationship between minimum PRF and
maximum allowed voltage level in UWB IR]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.
TG4a
May11th 2005 Doc: IEEE 15-05-0250-00-004a
Ismail Lakkis, Saeid Safavi, Wideband Access Inc.
Slide 2
Impulse Radio-BPSK/Ternary
VPeak
TC
PRI
))((log103.41)(
where
,10
)(log10)(log10)()(
or
ModulationBPSK
10
10
)()(log10)(
1010
10
MHzBWdbmP
PRF
PRFBWdbmPdbmP
PRF
BWPP
Ave
dbmPBWdbmP
MHzMHzAvePeak
AvePeak
PeakPeakAve
))((log103.41)(
where
,10
)(3)(log10)(log10)()(
or
2
ModulationTernary
10
10
3)()(log10)(
1010
10
MHzBWdbmP
PRF
dBPRFBWdbmPdbmP
PRF
BWPP
Ave
dbmPBWdbmP
MHzMHzAvePeak
AvePeak
PeakPeakAve
TG4a
May11th 2005 Doc: IEEE 15-05-0250-00-004a
Ismail Lakkis, Saeid Safavi, Wideband Access Inc.
Slide 3
Minimum PRF RequirementsBW = 500 MHz
Technology CMOS 90nm 2.5 Vpp, BPSK CMOS 90nm 2.5 Vpp, Ternary
TChip (nsec) 2 2
BW (MHz) 500 500
VPeak (v) 1.25 1.25
PAve (dBm) -14.31 -14.31
PPeak (dBm) 11.94 11.94
PRF (MHz) @ VPeak (No Margin) 1.19 2.37
PRF (MHz) @ VPeak (8 dB Margin)* 7.48 14.97
BW = 1500 MHz
Technology CMOS 90nm 2.5 Vpp, BPSK CMOS 90nm 2.5 Vpp, Ternary
TChip (nsec) 0.66 0.66
BW (MHz) 1500 1500
VPeak (v) 1.25 1.25
PAve (dBm) -9.54 -9.45
PPeak (dBm) 11.94 11.94
PRF (MHz) @ VPeak (No Margin) 10.67 21.35
PRF (MHz) @ VPeak (4.5 dB Margin) 30.09 60.17
TG4a
May11th 2005 Doc: IEEE 15-05-0250-00-004a
Ismail Lakkis, Saeid Safavi, Wideband Access Inc.
Slide 4
Benefits of Low PRF over High PRF
• A Low PRF system has a lower implementation cost when compared to a high PRF system
• Overall required RF/IF gain is lower for a Low PRF system. For example a 12 MHz PRF would reduce the receiver dynamic range by 7 dB when compared to a 60 MHz PRF
• The ADC would run at 12 MHz instead of 60 MHz in the above example and the entire digital processor would run at a lower clock reducing the power by a factor of 5 in CMOS
• Acquisition is easier to implement since with Lower PRF the sync matched filter is much smaller:– If a 12 MHz system requires a 64 pulses sync pattern, a 60 MHz system
would require a sync of 320 pulses to achieve same SNR.
• Since Energy per pulse is higher (7 dB in the above example), a non-coherent receiver would perform better.
TG4a
May11th 2005 Doc: IEEE 15-05-0250-00-004a
Ismail Lakkis, Saeid Safavi, Wideband Access Inc.
Slide 5
PLL Reference Diagram
OscillatorReference
Divider(R)
Divider, N
Phase Det.
XTAL
fX fComp
fX(MHZ)
R fcomp(MHz)
(13,26) (1,2) 13
(9.6,19.2) (24,48) 0.4
(12,24) (6,12) 2
LPF VCO
output
TG4a
May11th 2005 Doc: IEEE 15-05-0250-00-004a
Ismail Lakkis, Saeid Safavi, Wideband Access Inc.
Slide 6
Frequency Plan Band No. 3 dB BW
(MHz)
Low Freq.
(MHz)
Center Freq.
(MHz)
High Freq.
(MHz)
1 494 3211 3458 3705
2 494 3705 3952 4199
3 494 4199 4446 4693
3 4 5 GHz3.5 4.53.25 3.75 4.25 4.75
Note: This plan has almost double margin to 4.9 GHz as compared to 3.1 GHz
1 2 3
Band No. 4
207MHz
111MHz
TG4a
May11th 2005 Doc: IEEE 15-05-0250-00-004a
Ismail Lakkis, Saeid Safavi, Wideband Access Inc.
Slide 7
The PRF• To satisfy other proposer’s preferences a wide range of PRFs (total of 3) are
supported which are compliant with the Harmonic Chip rate requirements.
• The basic recommended PRF is 15.4375 MHz.
• PRFs of 30.875 MHz and 61.75 MHz are also supported.
• These PRFs can be generated from the center frequencies of the supported bands. For example, a PRF of 61.75 MHz may be obtained by dividing the center frequencies by 8x7, 8x8 , and 8x9 for bands 1, 2, and 3 respectively. This is further illustrated in the next slide.
TG4a
May11th 2005 Doc: IEEE 15-05-0250-00-004a
Ismail Lakkis, Saeid Safavi, Wideband Access Inc.
Slide 8
PRF Flexibility • Example of the flexibility of the new PRF scheme compared to Wisair’s proposal for
generation of the PRF of above 60 MHz
4x3x5
4x13
4x17
Center Freq.(MHz) Harmonic Ratio
PRF(MHz)
3960
3432
4488
66
66
66
Wisair’s Proposal Wideband Access’ Proposal
Prime Factors: 17, 13, 5, 3
64
8x7
8x3x3
Center Freq.(MHz) Harmonic Ratio
PRF(MHz)
3952
3458
4446
61.75
61.75
61.75
Prime Factors: 7, 3
TG4a
May11th 2005 Doc: IEEE 15-05-0250-00-004a
Ismail Lakkis, Saeid Safavi, Wideband Access Inc.
Slide 9
Frequency Plan Details New Band Plan
(in MHz)
XTAL 26
R 1
Fref 26
DF 494
F2C 3952 F2L 3705 F2H 4199
F1C 3458 F1L 3211 F1H 3705
F3C 4446 F3L 4199 F3H 4693
PRF1 61.75
N1 64 N2 56 N3 72
PRF2 30.875
N1 128 N2 112 N3 144
PRF3 15.4375
N1 224 N2 256 N3 288
MHzBW
MHzDF
where
PRFMNF
PRFMNF
PRFNF
PRFMDF
mmC
mmL
mmC
500
494
)(
,)(
,
,
:Note
TG4a
May11th 2005 Doc: IEEE 15-05-0250-00-004a
Ismail Lakkis, Saeid Safavi, Wideband Access Inc.
Slide 10
Margin to 3.1 and 4.9• The 3.1 GHz corner filtering is mandatory (FCC
requirement), whereas, the rejection at 4.9 is desirable.
• For an impulse radio using a pulser (no mixer), the only required filtering in the chain is the RF BPF. Consequently, the BPF is responsible for the -10 dB (at least) rejection at 3.1 GHz. Hence a relatively safe margin at 3.1 GHz is required (as supported in this proposal).
• In any case, there is a safe margin to 4.9 GHz in our new proposal.
TG4a
May11th 2005 Doc: IEEE 15-05-0250-00-004a
Ismail Lakkis, Saeid Safavi, Wideband Access Inc.
Slide 11
Benefits of the Frequency Plan• Support of a wide range of PRFs . These PRFs allow
peak power margins of 4.5-8 dB.
• Support of a range of Xtals (12,13,9.6, etc.)
• Enough margin to 3.1 & 4.9 GHz (to meet the FCC requirements and coexistence with WLAN).
• The proposed PRFs can be easily generated using mainly power of 2 divisions in the first stages, while maintaining small division factors at last stages (3,7).
