1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Single Baseband Structure to support Multi RF]
Date Submitted: [9 Sep. 2008]
Source: [H.S.Lee, D. Y. Kim, C. S. Eun, S. M. Ryu] Company [ETRI, Chungnam Univ., Casuh]
Address [220 Yuseong-gu, Gung-dong, Daejeon, Korea]
Voice: [ , ], FAX: [ , ]
Re: [Contribution to IEEE Meeting, Sep. 2008]
Abstract: [We want to enhance QoS. and transmit high speed with low power structure. If we could support multi narrow band RF with single baseband chip without any interference among multi RF’s ; QoS & High Speed are not any more troublesome in WBAN.]
Purpose: [Proposal]
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

2. Single Baseband Structure to support Multi RF
We want to enhance QoS and transmit high speed with low power structure.
If we could support multi narrow band RF with single baseband chip without any interference among multi RF’s ;
QoS & High Speed are not any more troublesome in WBAN.
Sep. 2008
S. M. Ryu
CASUH
H. S. Lee
ETRI
D. Y. Kim and C. S. Eun
Chungnam Univ.

3. Diversity Test Conditions
Diversity Type
Mode 1 : Frequency & Time Hybrid Diversity
Mode 2 : Time Diversity with fixed frequency f1
Mode 3 : Time Diversity with fixed frequency f4
Test Method
Diversity Number : 1 to 5
Test Trial Frame Number : 20,000
Test Path
Case A : ~30m ; 1 soft board wall
Case B : ~30m : opposite direction to Case A
Case C : ~30m : 2 soft board wall
Decision Rule
Count number of Frame Error (CRC check)
Count number of Sync Loss (128 bit frame)
If we received one perfect frame among multi frames,
we did not count as error

4. Diversity Test Frame Structure
Mode 1: Time & Frequency hybrid Diversity
d1, f1
d1, f2
d1, f3
d1, f4
d1, f5
d2, f1
Mode 2: Time Diversity with fixed frequency f1
d1, f1
d2, f1
Mode 3: Time Diversity with fixed frequency f4
d1, f4
d2, f4
Diversity number : 1,2,3,4,5 times

5. Frame Error Rate & Sync Loss Table
# of frame error / # of Sync loss
Test
Path
Diversity
Mode
Diversity Number 1 2 3 4 5
Case A
Mode 1
5390 / 646
1563 / 29
667 / 3
282 / 0
210 / 0
Mode 2
3123 / 602
2293 / 316
2022 / 253
1874 / 230
1758 / 214
Mode 3
4506 / 1096
3258 / 902
2868 / 848
2666 / 825
2541 / 811
Case B
2700 / 329
106 / 2
9 / 0
1 / 0
0 / 0
3601 / 601
2487 / 303
2136 / 254
1945 / 237
1816 / 229
2361 / 422
1706 / 185
1457 / 135
1310 / 125
1215 / 111
Case C
8264 / 1272
3545 / 101
1536 / 8
637 / 0
480 / 0
4648 / 724
3416 / 424
2976 / 363
2750 / 332
2580 / 309
5640 / 961
4287 / 614
3749 / 514
3461 / 460
3280 / 418

6. Example : 1Mbps Time & Frequency Diversity
d1, f1
d1, f2
d1, f3
d1, f4
d2, f1
d2, f2
d2, f3
d2, f4
Frame
Format
repeater
750Kbps 1M 4M
RF #1
32MHz

7. Example : 1Mbps Frequency Diversity
Frame Must be synchronized among RF’s
RF #1 f1 1M
Frame
Format
Mux/
Demux
RF #2 f2 1M RF
combiner
750Kbps 1M
RF #3 f3 1M
RF #4 f4
32MHz 1M

8. Single Baseband for Multi RF Concept
Frequency Diversity
High speed Tx with narrow band RF
RF #1 f1 4M
Frame
Format
Mux/
Demux
RF #2 f2 4M RF
combiner
12Mbps
16M
RF #3 f3 4M
RF #4 f4
32MHz 4M

9. Frame Structure example for scalable data rate
2msec
250μsec
128μsec
64μ 8μ
1500μsec
50μ
Lock
Preamble
Tag AA
Payload
EOF
1Mbps
250K ~ 4Mbps
Basic data rate
Scalable data rate
750K / 1M
1.5M / 2M
3M / 4M
6M / 8M
12M / 16M
Overhead : Payload = 1 : 3
Payload Data Speed = 750Kbps ; 1MHz clock

10. Conclusion Multi Preamble Concept is suitable for WBAN
Reduce transmission time & Power consumption
Enhance QoS by perfect frame synchronization by hybrid diversity
Special Preamble is possible ; emergency, cell planning, multi RF etc
Demerits of multi preamble is negligible
128bit correlator H/W is not burden now
Longer Preamble length is not time loss
Multi Preamble could support new service in WBAN application
Supply tool to make single MAC to support scalable data rate
Support special purpose service like emergence broadcasting
Increase mobile channel capacity by Pico-cell Hand-over Planning
Diversity, Selective Hopping, Service converging, etc
Multi RF Structure is useful for low power WBAN implementation
Synchronous frame concept can reject mutual interference among RF’s
Narrow band RF is easy to design, low power consumption and low cost.