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

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]

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

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  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: [+82-31-709-5577, +82-42-821-6862], FAX: [+82-31-709-5578, +82-42-823-5586] E-Mail:[hsulee@etri.re.kr, dykim@cnu.kr, retaw@casuh.com] Re: [Contribution to IEEE 802.15.6 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 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.

  2. Single Baseband Structure to support Multi RF We want to enhance QoS and transmit high speed with low powerstructure. 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 • Mode 2: Time Diversity with fixed frequency f1 • Mode 3: Time Diversity with fixed frequency f4 Diversity number : 1,2,3,4,5 times

  5. Frame Error Rate & Sync Loss Table # of frame error / # of Sync loss

  6. Example : 1Mbps Time & Frequency Diversity Frame Format repeater RF #1 750Kbps 1M 4M 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 1M 32MHz

  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 4M 32MHz

  9. Frame Structure example for scalable data rate 2msec 128μsec 64μ 1500μsec 8μ 250μsec 50μ 250K ~ 4Mbps 1Mbps 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.

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