1. May 2009
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Power and Spectrum Efficient PHY Proposal for g]
Date Submitted: [ 01 May, 2009]
Source: [Khanh Tuan Le] Company [Texas Instruments]
[Per Torstein Roine] Company [Texas Instruments]
Address [Gaustadalleen 21, 0349 Oslo, Norway]
Voice: [ ],
Re: []
Abstract: [Power and Spectrum Efficient PHY Proposal for g.]
Purpose: [Technical proposal. Presented to the g SUN Task Group for consideration.]
Notice: This document has been prepared to assist the IEEE P 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 P
Khanh Tuan Le

2. Power and Spectrum Efficient PHY Proposal for 802.15.4g
May 2009
Power and Spectrum Efficient PHY Proposal for g
IEEE 802 Interim Meeting
May 2009, Montreal, Quebec
Khanh Tuan Le
Khanh Tuan Le

3. doc.: IEEE 802.15-<doc#>
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OVERVIEW
Introduction
Gaussian Frequency-Shift Keying (GFSK)
Proposal Description at MHz for Europe
Proposal Description at MHz for the USA
Proposal at MHz for China
Forward Error Correction (FEC), Whitening and Packet Format
Discussion
Khanh Tuan Le
<author>, <company>

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Introduction (1)
This proposal is built upon the preliminary proposal as submitted in the document IEEE g.
Focus on user requirements, available frequency spectrum and applicable regulations for systems operating in the license exempt bands in the USA, Europe and other regions in the world
Reliable networks using the relatively simple and constant envelope modulation scheme GFSK
Multi channel support
Khanh Tuan Le
<author>, <company>

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Introduction (2)
Sub-1 GHz wireless systems are beneficial (power, range) in many metering applications
Spectral (and spectrum) efficiency increasingly more important
Need for higher data rates
Strong drive for standardization
Semiconductor technology requirements
Power optimized and cost efficient system solutions
Flexibility
Khanh Tuan Le
<author>, <company>

6. Gaussian Frequency Shift Keying (GFSK)
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Gaussian Frequency Shift Keying (GFSK)
FSK derivative- Constant amplitude modulation
Use of power efficient transmitter architectures and circuitry
Gaussian shaping provides better spectral efficiency.
GFSK can be efficiently implemented on silicon radios and is widely used today
2-GFSK (1 bit/symbol) / 4-GFSK (2 bit/symbol)
Khanh Tuan Le
<author>, <company>

7. Example of GFSK vs. FSK Signal
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Example of GFSK vs. FSK Signal
TO BE UPDATED
Khanh Tuan Le
<author>, <company>

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Proposal Description for Systems Operating at The MHz License Exempt Band In Europe
Khanh Tuan Le
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MHz ISM Band in Europe
ETSI
Frequency Band: MHz
Modulation and (programmable) data rates:
2-GFSK: 50 kbps and 100 kbps
4-GFSK: TBD kbps
Frequency band and allowed max output power:
MHz (600 kHz): 25 mW / +14 dBm
MHz (500 kHz): 25 mW / +14 dBm
MHz (250 kHz): 500 mW / +27 dBm
Frequency Agility (FA)
Dynamic power control
Khanh Tuan Le
<author>, <company>

10. doc.: IEEE 802.15-<doc#>
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EN Sub-Bands
EN v2.1.1
Khanh Tuan Le
<author>, <company>

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Channel Plan
Sub-band channel separation: 250 kHz
Number of channels: 5
Channel 1: MHz
Channel 2: MHz
Channel 3: MHz
Channel 4: MHz
Channel 5: MHz
Enable support of Frequency Agility (FA)
Khanh Tuan Le
<author>, <company>

12. Channel Plan Illustration
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Channel Plan Illustration
Khanh Tuan Le
<author>, <company>

13. Modulation and Data Rate
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Modulation and Data Rate
2-GFSK
Modulation Index: 0.75
BT=1
Data rates: 50 kbps and 100 kbps
4-GFSK
Modulation Index: TBD
Data rates: TBD kbps
Khanh Tuan Le
<author>, <company>

14. Transmitter Requirements
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Transmitter Requirements
Regulated by the applicable EN standard version
Minimum output power at maximum setting: -3 dBm
Transient power: Compliant with EN
Adjacent Channel Power (ACP): Compliant with EN
Spurious Emissions: Compliant with EN
Khanh Tuan Le
<author>, <company>

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Max Transmit Power
Channel No.
Center Freq
Max Output Power 1
MHz
25 mW (+14 dBm) 2
MHz 3
MHz 4
MHz 5
MHz
500 mW (+27 dBm)
Khanh Tuan Le
<author>, <company>

16. Receiver Requirements
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Receiver Requirements
RX Parameter
Value
Conditions
Receiver sensitivity
50 kbps 2-GFSK
100 kbps 2-GFSK
-92 dBm
-85 dBm
PER=1%, 20 bytes packet length
Selectivity
Adjacent Channel Rejetion
Alternate Channel Rejetion
30 dB
Desired channel 3dB above the sensitivity limit
Blocking Performance
±2 MHz offset
50 dB
Khanh Tuan Le
<author>, <company>

17. doc.: IEEE 802.15-<doc#>
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Proposal Description for Systems Operating at The MHz License Exempt Band In the USA
Khanh Tuan Le
<author>, <company>

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ISM MHz Band in US (1)
FCC Part
Frequency Band: MHz
Modulation and (programmable) data rates:
2-GFSK: 50 kbps and 100 kbps
4-GFSK: TBD kbps
Frequency band and allowed max output power:
MHz (26 MHz): 1 W / +30 dBm (500 mW / +27 dBm)
Dynamic power control
Frequency Hopping (FH)
Flexible trade-off between communication range and data rates
Khanh Tuan Le
<author>, <company>

19. Frequency Hopping Spread Spectrum
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Frequency Hopping Spread Spectrum
Required by regulations for high transmit power levels
Can be used for co-existence of multiple networks
Can enable high aggregate throughput
Inherent frequency diversity mechanism
Well known and proven technique
Required performance can be effectively achieved by semiconductor radio devices today
Khanh Tuan Le
<author>, <company>

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ISM MHz Band in US (2)
# Channels
Channel Spacing
[kHz]
Modulation
Data Rate
[kbps]
Max Output Power [dBm] 50
500
2-GFSK
+30
100
4-GFSK
TBD
Basic FH scheme can support any of the data rates in the table and facilitate max +30 dBm output power if needed.
Additional set(s) of (offset) channels could be defined to support multiple networks in the same area
The offset channels would partly overlap when the highest data rates are used
The main coexistence mechanism would still be the use of different hopping sequences
Although networks share the same frequency range, coexistence is improved by good far-away selectivity, as the networks have a high probability of large frequency spacing at any given moment in time
Multipath fading mitigation and coexistence with other networks are maximized utilizing the entire frequency band
Khanh Tuan Le
<author>, <company>

21. Co-existence of Multiple FH Networks
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Co-existence of Multiple FH Networks
Khanh Tuan Le
<author>, <company>

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Proposal Description for Systems Operating at The MHz Frequency Band In China
Khanh Tuan Le
<author>, <company>

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MHz Band in China
Governed by the Chinese Short Range Device Regulations at MHz
Frequency Band: MHz
Utilized Frequency Band: MHz
Modulation and (programmable) data rates:
2-GFSK: 40 kbps and 75 kbps
4-GFSK: TBD kbps
Max output power allowed: 50 mW / +17 dBm
Dynamic power control
Frequency Hopping
Khanh Tuan Le
<author>, <company>

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Other Regions
# Channels
Channel Spacing
[kHz]
Modulation
Data Rate
[kbps]
Max Output Power [dBm]
3 x 30
200
2-GFSK 40
+17 75
4-GFSK
TBD
Additional set(s) of (offset) channels could be defined to support multiple networks in the same area
The offset channels are not overlapping
The main coexistence mechanism would still be the use of different hopping sequences
Multipath fading mitigation and coexistence with other networks are maximized utilizing the entire frequency band
Khanh Tuan Le
<author>, <company>

25. Forward Error Correction (FEC) Whitening Packet Format
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Forward Error Correction (FEC) Whitening Packet Format
Khanh Tuan Le
<author>, <company>

26. Simple Low Overhead FEC Proposal
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Simple Low Overhead FEC Proposal
As support for very long packets is mandatory, a simple low-overhead FEC should be defined for optional use to improve the packet error rate
Proposal: (128,120,4) extended Hamming code
SECDED: Corrects single bit, detect double bit errors
Double bit error detection does not improve PER, but is useful for early receive termination when packet is corrupted
Can also be viewed/implemented as (127,120,3) BCH, extended by an extra parity bit
Generator polynomials: x7+x3+1 (BCH) and x+1 (extra parity)
After 15 octets of PHY data, one octet containing parity check bits (PCB) is inserted
Khanh Tuan Le
<author>, <company>

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Packet Format
Khanh Tuan Le
<author>, <company>

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Whitening Proposal
Whitening is done after FEC octet insertion
Same LFSR polynomial is used for whitening all the time
The whitening LFSR is initialized to an unique value based on the channel number (and data rate) used for the packet
This would allow retransmissions to use different whitening for protection from packet data with poor whitening performance
Khanh Tuan Le
<author>, <company>

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Thank you!
Khanh Tuan Le
<author>, <company>