May 2007 May 2007 IEEE 802.15 IEEE 802.15 - - 07/685r1 07/685r1 Abbie Mathew, Abbie Mathew, NewLANS NewLANS Slide Slide 1 1 Project: IEEE P802.15 Working Group for Wireless Personal Area N Project: IEEE P802.15 Working Group for Wireless Personal Area N etworks etworks Submission Title: Submission Title: [An Innovative High Speed Modem Implementation] [An Innovative High Speed Modem Implementation] Date Submitted: Date Submitted: [May 6,2007] [May 6,2007] Source: Source: [Abbie Mathew] Company [ [Abbie Mathew] Company [ NewLANS NewLANS , Inc.] , Inc.] Address [43 Address [43 Nagog Nagog Park, Suite 200, Westford, MA 01720, U.S.A.] Park, Suite 200, Westford, MA 01720, U.S.A.] Voice: [(978) 849 Voice: [(978) 849 - - 8000], E 8000], E - - Mail: [[email protected]] Mail: [[email protected]] Re: Re: [] [] Abstract: Abstract: [ [ NewLANS NewLANS proposal] proposal] Purpose: Purpose: [Contribution to 802.15 TG3c interim in Montreal, Canada] [Contribution to 802.15 TG3c interim in Montreal, Canada] Notice: Notice: This document has been prepared to assist the IEEE P802.15. It This document has been prepared to assist the IEEE P802.15. It is offered is offered as a basis for discussion and is not binding on the contributing as a basis for discussion and is not binding on the contributing individual(s) or individual(s) or organization(s). The material in this document is subject to cha organization(s). The material in this document is subject to cha nge in form and content nge in form and content after further study. The contributor(s) reserve(s) the right to after further study. The contributor(s) reserve(s) the right to add, amend or withdraw add, amend or withdraw material contained herein. material contained herein. Release: Release: The contributor acknowledges and accepts that this contribution The contributor acknowledges and accepts that this contribution becomes becomes the property of IEEE and may be made publicly available by P802. the property of IEEE and may be made publicly available by P802. 15. 15.
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Submission Slide 1 Abbie Mathew, NewLANS · May 2007 IEEE 802.15-07/685r1 Submission Slide 14 Abbie Mathew, NewLANS 1.5 GHz Pilot 2.0 GHz Pilot Lower Side Band Upper Side Band 25
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May 2007May 2007 IEEE 802.15IEEE 802.15--07/685r107/685r1
Project: IEEE P802.15 Working Group for Wireless Personal Area NProject: IEEE P802.15 Working Group for Wireless Personal Area Networksetworks
Submission Title:Submission Title: [An Innovative High Speed Modem Implementation][An Innovative High Speed Modem Implementation]Date Submitted: Date Submitted: [May 6,2007][May 6,2007]Source:Source: [Abbie Mathew] Company [[Abbie Mathew] Company [NewLANSNewLANS, Inc.], Inc.]Address [43 Address [43 NagogNagog Park, Suite 200, Westford, MA 01720, U.S.A.]Park, Suite 200, Westford, MA 01720, U.S.A.]Voice: [(978) 849Voice: [(978) 849--8000], E8000], E--Mail: [[email protected]]Mail: [[email protected]]Re:Re: [][]Abstract: Abstract: [[NewLANSNewLANS proposal]proposal]Purpose:Purpose: [Contribution to 802.15 TG3c interim in Montreal, Canada][Contribution to 802.15 TG3c interim in Montreal, Canada]Notice:Notice: This document has been prepared to assist the IEEE P802.15. It This document has been prepared to assist the IEEE P802.15. It is offered is offered as a basis for discussion and is not binding on the contributingas a basis for discussion and is not binding on the contributing individual(s) or individual(s) or organization(s). The material in this document is subject to chaorganization(s). The material in this document is subject to change in form and content nge in form and content after further study. The contributor(s) reserve(s) the right to after further study. The contributor(s) reserve(s) the right to add, amend or withdraw add, amend or withdraw material contained herein.material contained herein.Release:Release: The contributor acknowledges and accepts that this contribution The contributor acknowledges and accepts that this contribution becomes becomes the property of IEEE and may be made publicly available by P802.the property of IEEE and may be made publicly available by P802.15.15.
May 2007May 2007 IEEE 802.15IEEE 802.15--07/685r107/685r1
A synchronous clock encoding technique in PAM transmissionA synchronous clock encoding technique in PAM transmissionThree level systemThree level system
•• Logical 0 is represented by no symbolLogical 0 is represented by no symbol•• Logical 1 by pulses of alternating polarityLogical 1 by pulses of alternating polarity
Inherent limited error detecting capabilityInherent limited error detecting capabilityZero spectral density at 0 and 1/(2.Baud Period)Zero spectral density at 0 and 1/(2.Baud Period)No DC componentNo DC component
Inserted at 0 and 1/(2T), points of zero power densityInserted at 0 and 1/(2T), points of zero power density•• Minimum effect on peakMinimum effect on peak--toto--averageaverage--power ratiopower ratio
Clock always coherent with data signalClock always coherent with data signal
Features offeredFeatures offered•• Relatively immune to phase noise and frequency errors at 60 Relatively immune to phase noise and frequency errors at 60
GHzGHz
•• Fast data recovery (Fast data recovery (∼∼100 ns) by virtue of no 100 ns) by virtue of no CostasCostas looploop
•• Fast AGC (40 dB dynamic range, 1% of actual value in Fast AGC (40 dB dynamic range, 1% of actual value in ∼∼10 10 µµs)s)
Pilot TonesPilot Tones
May 2007May 2007 IEEE 802.15IEEE 802.15--07/685r107/685r1
Proposal data based Proposal data based on existing prototypeon existing prototype
Proposing 4 Proposing 4 GbpsGbps per per channel solutionchannel solution
NoteNoteSpectral efficiency of 2 bps/HzSpectral efficiency of 2 bps/HzPrototype built on offPrototype built on off--thethe--shelf componentsshelf components
May 2007May 2007 IEEE 802.15IEEE 802.15--07/685r107/685r1
No data, only pilotsNo data, only pilots99% (90%) of power (voltage) is 99% (90%) of power (voltage) is contributed by 2 GHz pilotcontributed by 2 GHz pilotQuestion Question -- how can how can ‘‘AA’’ be reduced?be reduced?
Data and pilotsData and pilots
20 dB20 dB
AA
Transmitted WaveformTransmitted WaveformFrequency Domain and Time DomainFrequency Domain and Time Domain
May 2007May 2007 IEEE 802.15IEEE 802.15--07/685r107/685r1
1.5 GHz Pilot1.5 GHz Pilot 2.0 GHz Pilot2.0 GHz Pilot
Lower Side Lower Side BandBand
Upper Side Upper Side BandBand
25 dB25 dB
NoteNoteWaveform at the output of Waveform at the output of TxTx base band bit pipebase band bit pipeLower side band block Lower side band block upconvertedupconverted to 60 GHzto 60 GHzExisting 60 GHz millimeter wave transceiver based on Existing 60 GHz millimeter wave transceiver based on GaAsGaAs devicesdevices
Transmitted WaveformTransmitted WaveformRejection of Upper SidebandRejection of Upper Sideband
30 dB in next 30 dB in next design spindesign spin
May 2007May 2007 IEEE 802.15IEEE 802.15--07/685r107/685r1
Interference of Pilot TonesInterference of Pilot TonesAssumptions & AnalysisAssumptions & Analysis
2 GHz
250 MHz
250 MHz 200 MHz
QuestionQuestionCan pilots from adjoining channel interfere?Can pilots from adjoining channel interfere?
AssumptionAssumption
Dependent on base band implementation Dependent on base band implementation –– several options availableseveral options availableClosest an interfering pilot comes to the actual one is 250 MHzClosest an interfering pilot comes to the actual one is 250 MHz
May 2007May 2007 IEEE 802.15IEEE 802.15--07/685r107/685r1
•• Maximum likelihood not implemented in current design (500 Maximum likelihood not implemented in current design (500 MHz, 1 MHz, 1 GbpsGbps) ) –– will implement in next design spin (1 GHz, 2 will implement in next design spin (1 GHz, 2 GbpsGbps))
Maximum likelihood provides SNR gain of Maximum likelihood provides SNR gain of 22 dBdB
All implementation in analog domainAll implementation in analog domain
DecodingDecoding
May 2007May 2007 IEEE 802.15IEEE 802.15--07/685r107/685r1
Design that focuses on low cost, high speed and low powerFlexible architecture – any digital input, with or without codingSpectral efficiency of 2 bps/Hz at 25% roll offPerformance comparable to 2-level PAMNo DACs or DSPsLow power, low latencyCan operate at 1 dB compression pointRelatively immune to phase noise and frequency errors at 60 GHzFast data recovery (~100 ns)Fast AGC (40 dB dynamic range, 1% of actual value in ∼10 µs)Fixed data rate and modulation – translates to simplicityUp to 12 Gbps
Due
to p
ilot t
ones
Modem FeaturesModem Features
May 2007May 2007 IEEE 802.15IEEE 802.15--07/685r107/685r1
Current design supports all applications in the usage Current design supports all applications in the usage model and beyondmodel and beyond
4 4 GbpsGbps [2 GHz/channel] will meet most immediate applications[2 GHz/channel] will meet most immediate applications[2 GHz/channel] . [3 channels] . [2 bps/Hz] = 12 [2 GHz/channel] . [3 channels] . [2 bps/Hz] = 12 GbpsGbps
Two techniques to increase data rateTwo techniques to increase data rateChannel bondingChannel bonding•• Low power consumption, low complexityLow power consumption, low complexity
•• Margin drops by 3 dB per channel bondingMargin drops by 3 dB per channel bonding
Base band stackingBase band stacking•• Maintains marginMaintains margin•• Power consumption doubles, adds complexityPower consumption doubles, adds complexity
Migration PathMigration Path
May 2007May 2007 IEEE 802.15IEEE 802.15--07/685r107/685r1
•• EbEb/No of 11 dB for AWGN/No of 11 dB for AWGN•• EbEb/No of 15 dB for 95% availability/No of 15 dB for 95% availability
CommentCommentPerformance can be improved by about 2 dB Performance can be improved by about 2 dB by considering circular polarization for LOS by considering circular polarization for LOS applicationsapplications
BER Plot BER Plot CM1.2, CM1.2, TxTx 3030°° ►► Rx 30Rx 30°°
May 2007May 2007 IEEE 802.15IEEE 802.15--07/685r107/685r1
Power (Power (dBmdBm) Into Antenna Versus Margin) Into Antenna Versus Margin
NoteNoteRefer to the previous slide for details on receiver sensitivityRefer to the previous slide for details on receiver sensitivityAdd about 2 dB for insertion loss in SP2T switch to determine poAdd about 2 dB for insertion loss in SP2T switch to determine power wer out of 60 GHz amplifierout of 60 GHz amplifier
-10.1
-8.1
-3.1
-6.1
0.9
-4.1
3
5
10
Mar
gin,
dB
CM1.2, BER= 10-6, 95% availability
AWGN
Link AnalysisLink AnalysisPortable Applications [3 m, 4 Portable Applications [3 m, 4 GbpsGbps]]
May 2007May 2007 IEEE 802.15IEEE 802.15--07/685r107/685r1
Margin 8.5 dBRequire Require ≥≥ 20 dB margin for AGC to 20 dB margin for AGC to operate to mitigate shadowing effectsoperate to mitigate shadowing effects
May 2007May 2007 IEEE 802.15IEEE 802.15--07/685r107/685r1
Base Band Bit PipeBase Band Bit PipeBased on existing prototypes with offBased on existing prototypes with off--thethe--self componentsself componentsNo sharing of functionality between No sharing of functionality between TxTxand Rx band bit pipe modulesand Rx band bit pipe modules130 nm CMOS implementation 130 nm CMOS implementation
60 GHz CMOS60 GHz CMOS100 100 mWmW maximum for 60 GHz output maximum for 60 GHz output power of 5 power of 5 dBmdBm maximummaximum
Estimated Power ConsumptionEstimated Power ConsumptionBlock Diagram & AssumptionsBlock Diagram & Assumptions
Tx Base Band Bit Pipe
60 GHz CMOS transmitter
SP2T Switch
60 GHz CMOS receiver
Rx Base Band Bit Pipe
Serial digital input at 4 Gbps [2 GHz]] 1 to 8 GHz
Antenna60 GHz CMOSModem
Digital Source
Digital Sink
Digital Conditioning
Digital Conditioning
Serial digital output at 4 Gbps [2 GHz]
1 to 8 GHz
■ Parallel to serial interface■ Variable data stream to 4 Gbps■ Equalization■ FEC encoding
Digital Domain
Variable data rate
May 2007May 2007 IEEE 802.15IEEE 802.15--07/685r107/685r1
OutOut--ofof--thethe--box design optimized for high data box design optimized for high data rate, low power consumption, flexibility, fast rate, low power consumption, flexibility, fast clock recovery and AGCclock recovery and AGC
Flexibility in designFlexibility in design•• Current design based on analog signal processingCurrent design based on analog signal processing
•• Incorporate Incorporate DACsDACs and and DSPsDSPs when they maturewhen they mature