1. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [PHY pre-proposal for PAC common discovery mode]
Date Submitted: [May 2013]
Source: [Tae-Joon Park*, Jae-Min Ahn**, Keun Hyung Lee*, Wun-Cheol Jeong*, Chang-Sub Shin*, Hoyong Kang*]
Company: [*ETRI, **Chungnam National Univ.]
Re: []
Abstract:
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
<author>, <company>

2. PHY Pre-proposal for PAC common discovery mode
<month year>
doc.: IEEE <doc#>
PHY Pre-proposal for PAC common discovery mode
Tae-Joon Park*, Jae-Min Ahn**, Keun Hyung Lee*, Wun-Cheol Jeong*, Chang-Sub Shin*, Hoyong Kang*
*ETRI, **Chungnam National Univ
<author>, <company>

3. Common discovery mode for PAC
PD finding
Exchange PD capability
Peer-to-peer connection setup
To support interoperability between PAC devices regardless of frequency bands
Discovery mode should be unique in PAC
Optimized for peer-discovery

4. Requirements of Common discovery mode
Low HW implementation complexity
RF chain
ADC/DAC
Baseband
Simple and robust PHY
IPR free to reduce the debate for mandatory mode  requires well known and simple PHY
Robustness is more important than the transmission rate
Single mode (modulation type, rate, etc.)

5. Messages over Common discovery mode
Beacon
Broadcast PD capabilities
Connection request
IDs
With the capabilities of requesting PD
Connection acknowledge
With the connection mode

6. Possible framing structure
Preamble
Header
Message type
Length of PSDU
Header check sequence
PSDU
Preamble
Header
PSDU

7. Possible modulation type
Binary FSK
On-off Keying
Differential BPSK
Simple receiver structure with non-coherent demodulation
Moderate performance

8. Pros and cons for modulation types
Binary FSK
- Constant envelope
- Simple receiver
- Low bandwidth efficiency
On-Off
Keying
Simplest receiver
More bandwidth efficiency
- Higher PAPR
Differential
BPSK
Simple receiver
- Digital Baseband implementation only

9. Encoding Error detection and retransmission only
Reducing the decoder complexity
Simple CRC would be OK
Ex: 8bit CRC

10. Preamble Purpose of preamble Signal detection AGC synchronization
AFC : frequency synchronization
Symbol synchronization
Frame synchronization
Etc.
Preamble sequence candidates
CAZAC sequence
M-sequence
Barker code
Gold code

11. Example of transmitter structure
Add CRC
Scramble
MUX
PSDU
information
To transceiver
Modulation
And/or
Spreading
Add CRC
Scramble
Header
information
Preamble

12. PHY parameters Band candidates Sub-1GHz ISM : 2.4GHz, 5GHz 6-10GHz
Other licensed band
Data rate and Bandwidth
50Kbps, 200KHz is enough for implementing common communication mode