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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: [ Consideration of Coexistence Problem] Date Submitted: [11 January 2008] Source: [Changsoo Eun, Seungmoon Ryu] Company [CNU, Casuh, Inc.] Address [220 Yuseong-gu, Gung-dong, Daejeon, Korea]

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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: [Consideration of Coexistence Problem] Date Submitted: [11 January 2008] Source: [Changsoo Eun, Seungmoon Ryu] Company [CNU, Casuh, Inc.] Address [220 Yuseong-gu, Gung-dong, Daejeon, Korea] Address [813 Leaders Building, 342-1 Yatap-dong, Bundang-gu, Seongnam, Gyeonggi-do 463-070, Korea ] Voice:[+82-42-821-6864, +82-31-709-5577], FAX: [+82-42-823-4632, +82-31-709-5578], E-Mail:[eun@ieee.org, retaw@casuh.com] Re: [Contribution to IEEE 802.15.6 Meeting, January 2008] Abstract: [Address the coexistence problem and its remedy] 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. <C. Eun, S. Ryu>, <CNU, Casuh>

  2. Consideration of Coexistence Problem Changsoo Eun, CNU Seungmoon Ryu, Casuh, Inc. January 13-18, 2008

  3. S2 S1 F C A F Tx : 0dbm C M M F C M F C A Rx : -80dbm M M M A C F M Spurious :-60dbm C F S5 S6 S3 Rx : -80dbm Tx : 0dbm Near-Far Problem • When two networks coexist, a transmitter next to the receiver deteriorates the receiver signal quality. <C. Eun, S. Ryu>, <CNU, Casuh>

  4. Near-Far Problem • Even when the frequencies are different, the phase noise comes into trouble. <C. Eun, S. Ryu>, <CNU, Casuh>

  5. Near-Far Problem • Or receiver non-linearity causes trouble. <C. Eun, S. Ryu>, <CNU, Casuh>

  6. Near-Far Problem If A1≪ A2, when α3 < 0. <C. Eun, S. Ryu>, <CNU, Casuh>

  7. Near-Far Problem • Inter-modulation due to nonlinearity <C. Eun, S. Ryu>, <CNU, Casuh>

  8. Remedy • Synchronized and scheduled data transmission and reception Super Frame R T/R T R T T/R M S1 R R/T T R T S2 R/T S3 A B C D T/R S5 T/R R T T R S6 T R T R R/T R/T <C. Eun, S. Ryu>, <CNU, Casuh>

  9. Remedy • An example of data formats <C. Eun, S. Ryu>, <CNU, Casuh>

  10. Remedy • One master among the multiple pico-nets in the same area • One hopping pattern for each pico-net • TDMA for devices within each pico-net <C. Eun, S. Ryu>, <CNU, Casuh>

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