Project: IEEE P802.15 Working Group for Wireless Personal Area - - PowerPoint PPT Presentation

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Project: IEEE P802.15 Working Group for Wireless Personal Area - - PowerPoint PPT Presentation

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March 2003 doc.: IEEE 802.15-03101r0 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks ( etworks (WPANs WPANs) ) Project: IEEE P802.15 Working Group for Wireless Personal Area N Submission Title: [ Channel ized, Optimum

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SLIDE 1

March 2003

Jonathon Cheah, femto Devices Inc. Slide 1

doc.: IEEE 802.15-03101r0

Submission

Project: IEEE P802.15 Working Group for Wireless Personal Area N Project: IEEE P802.15 Working Group for Wireless Personal Area Networks ( etworks (WPANs WPANs) )

Submission Title: [Channel ized, Optimum Pulse Shaped UWB PHY Proposal] Date Submitted: [March 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:[jcheah@femtodevices.com] 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

  • f the potential feasibility in Silicon fabrication. The proposed PHY shall satisfy the basic 100 Mbps requirement, and the optional requirement
  • f 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.

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SLIDE 2

March 2003 Jonathon Cheah, femto Devices Inc. 2

Contents

1. 802.15.3a/4 requirements 2. Summary of the proposed PHY structure 3. Technical Rationale with Simulation Results – Channel planning – Gaussian wave shaping – Transmitter implementation – Receiver implementation – Performance 4. Q&A

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SLIDE 3

March 2003 Jonathon Cheah, femto Devices Inc. 3

1: Requirements

IEEE802.15.3a /4

  • Doc.03029r0P802-15-TG3a and others as guideline

– Physical Layer cost < Bluetooth i.e ~ $4.50 – Raw over the air speed >100 Mbps and 480 Mbps

  • ptional.

– Power consumption < 100mW – Range ≤10 m – Preamble length ~20 usec

  • FCC Rule – FCC 02-48 UWB ruling
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SLIDE 4

March 2003 Jonathon Cheah, femto Devices Inc. 4

FCC 02-48 Ruling

Salient points on Communications Applications

  • (Clause 7) Spirit of this rule is for “pulse modulation
  • f very narrow or short duration pulses”. (note 7)

Pulse duration of 0.1-2 nSec

  • (Clause 32) Non pulse modulation is allowed
  • (Clause 5/200) Must be indoor or handheld use only
  • (Clause 5) Frequency band allowed :3.1 to 10.6 Ghz.
  • (Clauses 22/ 30) Fractional bandwidth : ≥ 0.2 or

(note 78) 500 Mhz (min)

  • (Clause 68) peer to peer and 10 sec shut-down rule.
  • ***(Clause209) Peak emission: < 20log(BW(Mhz))-

14 or < 60 dB exceed average value. (Bw=4.5Ghz)

  • ------------- BW is defined as -10dB------------
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SLIDE 5

March 2003 Jonathon Cheah, femto Devices Inc. 5

Indoor UWB spectrum mask

Clause 65

41.3 dBm 10 dB 2 dB 10 dB

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SLIDE 6

March 2003 Jonathon Cheah, femto Devices Inc. 6

Handheld device Spectrum Mask

Clause 67

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SLIDE 7

March 2003 Jonathon Cheah, femto Devices Inc. 7

  • 2. UWB PHY PROPOSAL

Channel Plan

  • Define 8 x 800 Mhz (-4.3 dB BW) channels to cover 3.1

to 10.6 Ghz

  • Channels are: 4.000, 4.800, 5.600, 6.400, 7.200, 8.000,

8.800, 9.600 Ghz. (~1 Ghz from band edge.)

  • Channels 3,4,5 and 6 can form turbo channels. Channel

4 and 5 can form super-turbo channels.

  • Gaussian wave shaping with 1/τ= 400 Mhz,Bit rate

=200 Mbps

  • Turbo wave shaping 1/τ =1.2 Ghz, Bit rate=600Mbps
  • Super Turbo wave shaping 1/τ = 2.0 Ghz, Bit rate=1.0

Gbps

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SLIDE 8

March 2003 Jonathon Cheah, femto Devices Inc. 8

Channel Plan

CH 1 CH 3 CH 4 CH 2 CH 5 CH 6 CH 7 CH 8 4.000 Ghz 4.800 Ghz 5.600 Ghz 6.400 Ghz 7.200 Ghz 8.000 Ghz 8.800 Ghz 9.600 Ghz Basic Channels CH 3 CH 5 Turbo Channels CH 4

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SLIDE 9

March 2003 Jonathon Cheah, femto Devices Inc. 9

Super-Turbo Channels

CH 1 CH 3 CH 4 CH 2 CH 5 CH 6 CH 7 CH 8 4.000 Ghz 4.800 Ghz 5.600 Ghz 6.400 Ghz 7.200 Ghz 8.000 Ghz 8.800 Ghz 9.600 Ghz Basic Channels CH 4 Super-Turbo Channels CH 5

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SLIDE 10

March 2003 Jonathon Cheah, femto Devices Inc. 10

Basic 8 by 800 Mhz Channel Plan with indoor & Handheld limits

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SLIDE 11

March 2003 Jonathon Cheah, femto Devices Inc. 11

Gaussian Wave-Shaping

  • Any signal processing must consider implementation

feasibility.

  • At microwave frequency, it was concluded that Gaussian

filter is most optimum in terms implementation. – Well behaved in time domain response – Frequency response has linear phase – Best detection by rectification – Favorable in FCC calculation of power, ie maximizing effective transmit power allowed.

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SLIDE 12

March 2003 Jonathon Cheah, femto Devices Inc. 12

Proposed Gaussian Filtering Specification

  • Frequency response:
  • Impulse response:
  • 1/τ= 400 Mhz for basic channel rate
  • 1/τ= 1200 Mhz for turbo channel rate
  • 1/τ= 2000 Mhz for Super turbo channel rate
  • 1/τ point represents - 4.3 dB bandwidth
  • At -10 dB bandwidth ω= 1.517*1/τ
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SLIDE 13

March 2003 Jonathon Cheah, femto Devices Inc. 13

Gaussian TX to RX pulses at 200 Mbps

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SLIDE 14

March 2003 Jonathon Cheah, femto Devices Inc. 14

PHY Specifications Summary

  • 8 basic channel at 800 Mhz bandwidth
  • Gaussian wave-shaped pulses
  • 200 Mbps basic raw OTA bit rate
  • 20 uSec preamble with continuous pulses
  • Raw OTA bit rate may be coded (TBD)
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SLIDE 15

March 2003 Jonathon Cheah, femto Devices Inc. 15

  • 3. Technical Justifications.
  • Behavior Model and suggested transmitter

implementation

SRD Data 0 1 0 1 0 0 1 1 8 x Gaussian Channel Filter Bank UWB Transmitter MAC Convergence layel Bit Clock Pulse Clock Single pulse mixer minority carrier discharge 0 1 0 1 0 0 1 1 0 1 0 1 0 0 1 1

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SLIDE 16

March 2003 Jonathon Cheah, femto Devices Inc. 16

The governing relationships for low cost hardware implementation

  • Pulse Clock rate = modulo (Basic bit rate)
  • Channel Plan = modulo (Pulse Clock rate)
  • Channel bandwidth = modulo (Basic bit rate)
  • High speed mode rate = odd modulo (Basic bit

rate) It can be seen that the proposed numbers are close to optimum under these conditions

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SLIDE 17

March 2003 Jonathon Cheah, femto Devices Inc. 17

Brief TX simulation results comic-strip

1. 800Mhz Pulse Clock In SRD Circuit

  • 2. Input of Single

Pulse Mixer With 200Mbps Data and SRD

  • utput
  • 3. Gaussian

Impulse Response

  • 4. Post filter

200Mbps Data output

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SLIDE 18

March 2003 Jonathon Cheah, femto Devices Inc. 18

Behavior model and Suggested RX implementation (Hi-tech Crystal-set)

Signal Decision Block Bit-timing Loop SQ-law Det. MAC Convergence layel Data 2-bit Soft Decision Bit clock Channel Select Simple UWB "Crystal Radio" receiver LNA 8 x Gaussian Channel Filter Bank Received Signal

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SLIDE 19

March 2003 Jonathon Cheah, femto Devices Inc. 19

Suggested Signal processing Block for Hard and Soft Decision Detection

Hi S/H Lo S/H Mux +

  • Detected

Pulse Bit Clock +

  • Data

2-bit soft Decision

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SLIDE 20

March 2003 Jonathon Cheah, femto Devices Inc. 20

Brief RX simulation results comic-strip

  • 1. 200 Mbps Data received

after Gaussian Filter

  • 2. Detected Signal

after low pass filter

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SLIDE 21

March 2003 Jonathon Cheah, femto Devices Inc. 21

Considerations on implementation barriers

  • $1.50~2.50 of Silicon, package and test cost

should have no barriers -> retail cost ~$5.00☺

  • High frequency board material (texflon, allumina,

LTCC, etc) cost may be a concern.

  • Packaging will be tricky but not insurmountable
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SLIDE 22

March 2003 Jonathon Cheah, femto Devices Inc. 22

  • Misc. Checks…Can we build this IC..
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SLIDE 23

March 2003 Jonathon Cheah, femto Devices Inc. 23

Performance Attainable

  • 200Mbps Bit rate scalable up to 1.0 Gbps.

and Scalable down to any speed by code spread without any PHY Layer change.

  • Optimum raw bit speed with 1.2 nSec delay

spread protection.

  • Adjacent Channel rejection of 7 dB
  • Alternate Channel rejection of 22 dB
  • >10 meter Range in benign Propagation

environment.

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SLIDE 24

March 2003 Jonathon Cheah, femto Devices Inc. 24

Range, NF and the rest of it…

Assumptions:

  • Propagation index is linearly increasing

from 2.0 to 2.5 as from 1m to 10 m range.

  • FCC Peak power allowance 20log(BW)-14
  • Amplitude Noise capture threshold for S/N

is 10.5 dB

  • NF = 6 dB at 20 dB gain block
  • Channel 5 is used -> 7.2 Ghz
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SLIDE 25

March 2003 Jonathon Cheah, femto Devices Inc. 25

Burst Channel Performance

P_pk/P_av=14.5 dB

+18.7 (61.5) +15.7 +6.7 +6.7 +6.7

  • Eff. Peak

power (dBm)

16 1000 60 (61.5)

  • 72
  • 75

Super- Turbo 4000 10 15 600 57

  • 74
  • 75

Turbo 2400 10 (11) 200 48

  • 79
  • 75

Basic 800 10 20 200 48

  • 79
  • 65

Basic 800 5 25 200 48

  • 79
  • 60

Basic 800 3

S/N (dB) Bit Rate Mbps

FCC Peak power allowance Noise Floor (dBm)

Path Loss Channel type BW (Mhz) Range (m)

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SLIDE 26

March 2003 Jonathon Cheah, femto Devices Inc. 26

Continuous Channel Performance

P_av=const at -41.3 dBm

+5.7

  • 3.8
  • 7.3
  • Eff. Peak

power (dBm)

11 0.1 48 (47)

  • 79
  • 75

Basic 800 10 11 1 48 (37.5)

  • 79
  • 65

Basic 800 5 11 3 48 (32)

  • 79
  • 60

Basic 800 3

S/N (dB) Bit Rate Mbps

FCC Peak power allowance Noise Floor (dBm)

Path Loss Channel type BW (Mhz) Range (m)

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SLIDE 27

March 2003 Jonathon Cheah, femto Devices Inc. 27

Continuous Channel Performance

P_av=const at -41.3 dBm

+10.2

  • 1.2
  • 4.8
  • Eff. Peak

power (dBm)

11 0.12 57 (51.5)

  • 74
  • 75

Turbo 2400 10 11 1 57 (42.5)

  • 74
  • 65

Turbo 2400 5 11 3.4 57 (36.5)

  • 74
  • 60

turbo 2400 3

S/N (dB) Bit Rate Mbps

FCC Peak power allowance Noise Floor (dBm)

Path Loss Channel type BW (Mhz) Range (m)

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SLIDE 28

March 2003 Jonathon Cheah, femto Devices Inc. 28

Continuous Channel Performance

P_av=const at -41.3 dBm

+12.2 +3.2

  • 2.8
  • Eff. Peak

power (dBm)

11 0.12 60 (51.5)

  • 72
  • 75

Super Turbo 4000 10 11 1 60 (44.5)

  • 72
  • 65

Super Turbo 4000 5 11 3.5 60 (38.5)

  • 72
  • 60

Super turbo 4000 3

S/N (dB) Bit Rate Mbps

FCC Peak power allowance Noise Floor (dBm)

Path Loss Channel type BW (Mhz) Range (m)

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SLIDE 29

March 2003 Jonathon Cheah, femto Devices Inc. 29

Table Entry Calculation Example

SN 9.864 = SN No 41.3 − PL − pkreal + 10 log rate_reduction ( ) ⋅ + := rate_reduction 200 := PL 65.315 = pkreal 14.5 := Calculated Peak to Average: PL 20 log 4 π ⋅ d0 ⋅ λ

    

⋅ 10 n ⋅ log d d0

    

⋅ + := pk 47.584 = Path loss No 78.969 = pk 20 log 1.5 Bw 106 ⋅

    

⋅ 14 − := No 174 10 log Bw ( ) ⋅ − Nf − Lo − := FCC peak power allowance Lo := λ 3 108 ⋅ fc := Bw 800 106 ⋅ := Nf 6 := n 2 0.05 d ⋅ + := d 5 := fc 7.2 109 ⋅ := d0 1 :=