1. Date Submitted: [September 2007]
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Respond to Call for Intent in IEEE c Task Group]
Date Submitted: [September 2007]
Source: [Clint Powell, Kuor-Hsin Chang, Phil Beecher, Henk de Ruijter, Michael Schmidt, Frank Poegel] Company: [Freescale Semiconductor, Integration Associates, Atmel]
Address: [2100 E. Elliot Rd, MD: EL542, Tempe, AZ 85284, USA; West Street, Reigate, Surrey RH2 9BS, United Kingdom; 110 Pioneer Way, Unit L., Mountain View, CA 94041, Königsbrücker Strasse 61, Dresden, Germany]
Voice:[ , , , x155, , ],
Re: [ IEEE c ]
Abstract: [Response to 4c Task Group call for intent to share our vision about what could be a successful c standard.]
Purpose: [To encourage discussion.]
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
Submission
Clint Powell, Kuor-Hsin Chang, Phil Beecher, Henk de Ruijter,
Michael Schmidt, Frank Poegel (Freescale, Integration, Atmel)

2. Chinese Regulations Related to LR WPAN
The Radio Management Bureau (the regulatory body for radio usage in China) of China Information Department approved the following frequency bands and TX power limitation for the operation of WPAN equipment
430 ~ 432 MHz, 433 ~ MHz
Transmitting power limit: 10mW (e.i.r.p)
Occupied bandwidth: ≤ 400 kHz
779 ~ 787 MHz
No requirements for occupied bandwidth
The Radio Management Bureau of China Information Department does not object the ISM frequency band for the operation of WPAN equipment
2400 ~ MHz
The frequency offset allowed is 75KHz which is equivalent to 31.25ppm (for 2.4GHz)
Submission
Clint Powell, Kuor-Hsin Chang, Phil Beecher, Henk de Ruijter,
Michael Schmidt, Frank Poegel (Freescale, Integration, Atmel)

3. 779~787MHz Band Alternative PHY
8MHz total bandwidth available
Reuse of IEEE Optional 902~928MHz band PHY
Chip rate: 1000 kchip/sec
Modulation: O-QPSK
Data rate: 250 kb/sec
Symbol rate: 62.5 ksymbol/sec
Spreading code: 16-ary quasi-orthogonal
Will provide 4 channels in 8MHz BW, with a channel spacing of 2MHz
Submission
Clint Powell, Kuor-Hsin Chang, Phil Beecher, Henk de Ruijter,
Michael Schmidt, Frank Poegel (Freescale, Integration, Atmel)

4. 779~787MHz Band Alternative PHY
PN Code Characteristics:
Binary codes
PN Code 1 is the circular shift of PN Code 0 by 2
PN Code 8 is the complex conjugate of PN Code 0
No DC component
Submission
Clint Powell, Kuor-Hsin Chang, Phil Beecher, Henk de Ruijter,
Michael Schmidt, Frank Poegel (Freescale, Integration, Atmel)

5. 779~787MHz Band Alternative PHY
PN Codes & Symbol to Chip Mapping:
Data symbol
(decimal)
(b0 b1 b2 b3)
Chip values
(c0 c1 … c14 c15) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Submission
Clint Powell, Kuor-Hsin Chang, Phil Beecher, Henk de Ruijter,
Michael Schmidt, Frank Poegel (Freescale, Integration, Atmel)

6. 779~787MHz Band Alternative PHY
O-QPSK Modulation:
Prevents zero-crossing phase transition
Submission
Clint Powell, Kuor-Hsin Chang, Phil Beecher, Henk de Ruijter,
Michael Schmidt, Frank Poegel (Freescale, Integration, Atmel)

7. 779~787MHz Band Alternative PHY
Pulse Shaping Filter
Raised cosine pulse shaping with roll-off factor r = 0.8
To meet the -36dBm out-of-band rejection requirements as specified by Chinese regulatory
Added benefit of same (-36dBm) rejection in-band as well
Addition of pulse shaping filter results in a crest factor (Peak to Average Ratio) of ~ 1dB leads to moderate linearity requirements of the PA
Submission
Clint Powell, Kuor-Hsin Chang, Phil Beecher, Henk de Ruijter,
Michael Schmidt, Frank Poegel (Freescale, Integration, Atmel)

8. 779~787MHz Band Alternative PHY
Tx Power Spectrum with Pulse Shaping Filter Meeting -36dBm Requirement
Using pseudo random chip sequence with 40 ppm frequency offset and transmit power of 10 dBm
Measured with a 100 kHz resolution BW
Submission
Clint Powell, Kuor-Hsin Chang, Phil Beecher, Henk de Ruijter,
Michael Schmidt, Frank Poegel (Freescale, Integration, Atmel)

9. Performance Comparison to Current CWPAN PHY Proposal (AWGN)
DSSS = CWPAN M-PSK PHY Proposal.
COBI16 = O-QPSK PHY
w/ Half-Sine Pulse Shaping Actual pulse shape using raised cosine w/ r=0.8 will result in equivalent performance if not better.
The performance difference in AWGN is < 0.2dB
Submission
Clint Powell, Kuor-Hsin Chang, Phil Beecher, Henk de Ruijter,
Michael Schmidt, Frank Poegel (Freescale, Integration, Atmel)

10. Performance Comparison to Current CWPAN PHY Proposal (Flat Fading)
The performance under flat fading is almost identical
Submission
Clint Powell, Kuor-Hsin Chang, Phil Beecher, Henk de Ruijter,
Michael Schmidt, Frank Poegel (Freescale, Integration, Atmel)

11. Performance Comparison to Current CWPAN PHY Proposal (Fading)
The performance difference under fading channel is < 0.35 dB
Submission
Clint Powell, Kuor-Hsin Chang, Phil Beecher, Henk de Ruijter,
Michael Schmidt, Frank Poegel (Freescale, Integration, Atmel)

12. Advantages of This PHY Proposal
Maximizes reuse of the IEEE standard and avoids reinventing the wheel.
Leverages a known/proven/realizable PHY standard/solution.
An IEEE compliant device could easily add a MHz band O-QPSK PHY, providing instant multiple sources for the marketplace.
A CWPAN compliant device with this PHY could easily incorporate the differences to comply with IEEE and sell to markets outside China.
Submission
Clint Powell, Kuor-Hsin Chang, Phil Beecher, Henk de Ruijter,
Michael Schmidt, Frank Poegel (Freescale, Integration, Atmel)