Project: IEEE P Working Group for Wireless Personal Area Networks N (WPANs)
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1 Project: IEEE P Working Group for Wireless Personal Area Networks N (WPANs) Submission Title: [Wideband Measurement for Body Effect of BAN Channel] Date Submitted: [July 18, 2007] Source: [Tetsushi Ikegami] Company: [Meiji University, and NICT] Contact: Tetsushi Ikegami Voice:[ ] [ikegami@isc.meiji.ac.jp] Abstract: [Wideband measurement results of BAN channels in an anechoic chamber and BER evaluation of UWB single path receiver are introduced. Body effects are considered.] Purpose: [To help encouraging the discussion in SG-BAN] 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 Slide 1
2 Wideband Measurement for Body Effect of BAN Channel Tetsushi IKEGAMI and Kohei OHNO Department of Electronics and Bioinformatics, Meiji University, Kawasaki, Japan Slide 2
3 Outline Background Measurement Set up Wideband Measurement Results UWB BER Simulation Evaluation Conclusion Slide 3
4 Background Link between Sensor Nodes and BAN Coordinator - Star or Star with Relay or Mesh Topology? - Need to know Propagation Loss of Body Effects In Multipath-rich or Less Multipath Environments Wideband Channel Measurements Needed for Narrow band or UWB PHY In Less Multipath Environment for Baseline Slide 4
5 Measurement Conditions Anechoic Chamber Tx Antenna - Back -Chest - Upper Arm -Wrist 1m Rx Antenna Base Station 1.5m 2m 1.5m 1m 2m h Major Specification Measuremet mode Base Station Rx Antenna Height: h Tx-Rx Distance: r S21 Measuremet with Network Analyzer 1.0, 1.5, 2.0 [m] 1.0, 1.5, 2.0 [m] Distance r Frequency Range [GHz] Steel Chair Antenna UWB Dielectric Slide 5
6 Scenery of Experiment Anechoic Chamber at Meiji Univ. Slide 6
7 Measurement Results Slide 7
8 Amplitude [db] July 18, Free Space Loss, 0dBi Antenna Frequency Domain Characteristics (Tx Antenna: Wrist or Upper Arm) Wrist Antenna With Chair only Antenna only Body sit on a Chair With Chair only Antenna only Free Space Loss Body sit on a Chair Frequency [GHz] Amplitude [db] Free Space Loss Antenna With Chair only Upper Arm Body sit on a Chair With Chair only Antenna only Free Space Loss Antenna only Body sit on a Chair Frequency [GHz] Height of the Base Station:h = 1 [m], Transmitter-Receiver Distance:r = 1 [m] Slide 8
9 Frequency Domain Characteristics (Tx Antenna: Chest or Back) Amplitude [db] Free Space Loss, 0 dbi Antenna Antenna only Chest Body sit on a Chair With Chair only Antenna only Free Space Loss Body sit on a Chair Antenna With Chair only Frequency [GHz] Amplitude [db] Free Space Loss Back Antenna With Chair only Body sit on a Chair With Chair only Antenna only Free Space Loss Antenna only Body sit on a Chair Frequency [GHz] Height of the Base Station:h = 1 [m], Transmitter-Receiver Distance:r = 1 [m] Slide 9
10 Signal Level at the Back and Noise Floor Signal Level at the Back Noise Level Amplitude [db] Signal Level at the Back (Body sit on a Chair) > 10dB Frequency [GHz] Slide 10 Noise Level Height of the Base Station:h = 1 [m], Transmitter-Receiver Distance:r = 1 [m]
11 Slide 11 Frequency Domain Characteristics (h =1 [m]) Amplitude [db] Back Chest Upper Arm Wrist Upper Arm Chest Back Wrist Frequency [GHz] Height of the Base Station:h = 1 [m], Transmitter-Receiver Distance:r = 1 [m]
12 Frequency [GHz] Frequency Domain Characteristics (h=1.5 [m]) Amplitude [db] Back Upper Arm Wrist Wrist Upper Arm Chest Back Chest Height of the Base Station:h = 1.5 [m], Transmitter-Receiver Distance:r = 1 [m] Slide 12
13 Frequency Domain Characteristics (h = 2 [m]) Amplitude [db] Chest Back Wrist Wrist Upper Arm Chest Back Upper Arm Frequency [GHz] Height of the Base Station:h = 2 [m], Transmitter-Receiver Distance:r = 1 [m] Slide 13
14 Time Domain Characteristics at Chest Position 2.5 x Body Sit on a Steel Chair Amplitude Time [ns] Height of the Base Station:h = 1 [m], Transmitter-Receiver Distance:r = 1 [m] Slide 14
15 Time Domain Characteristics at Chest Position 2.5 x x Amplitude Amplitude Time [ns] Antenna only Height of the Base Station:h = 1 [m], Transmitter-Receiver Distance:r = 1 [m] Slide Time [ns] Antenna with Steel Chair only
16 Measurement Results Link Loss and Response Depends on Antenna Position on Body and Height of Base Station Antenna When Link is Blocked by Body (Antenna is on Back) ~15 to 25 db Loss Steel Chair Causes Multipath However, Body Masks the Effects of Multipath Slide 16
17 UWB Transmission Performance Evaluation, Bit Error Rate Simulation Slide 17
18 Amplitude Power [dbm] Tim e [ns] UWB Spectrum -7 5 FCC Indoor Limit FCC Outdoor Limit Frequency [GHz] Assumed UWB Pulse Waveform for BER Evaluation UWB Pulse: 2 at s0( t) exp sin( 2πf t ) 2 0 τ = Pulse Parameter: - Center Frequency, f 0 = 6.85[GHz] -Pulse Width, 2τ= 0.5[ns] Modulation Type:Bi-Phase (BPSK) Detection:Correlation Detection, Largest Path Selection Slide 18
19 BER Simulation Measured Frequency Responses at each Antenna Position with Normalized Total Received Power are used. Energy Capture is evaluated. Assume Single Path Coherent Receiver with the Largest Path Selection Simpler Rx Implementation for BAN PHY Slide 19
20 BER BER Performance Wrist Upper Arm Chest Back Bi-Phase Theory Eb/N0 [db] Height of the Base Station:h = 1 [m], Transmitter-Receiver Distance:r = 1 [m] Slide 20
21 BER BER Performance Wrist Upper Arm Chest Back Bi-Phase Theory Eb/N0 [db] Height of the Base Station:h =1.5 [m], Transmitter-Receiver Distance:r = 1 [m] Slide 21
22 BER BER Performance Wrist Upper Arm Chest Back Bi-Phase Theory Eb/N0 [db] Height of the Base Station:h = 2 [m], Transmitter-Receiver Distance:r = 1 [m] Slide 22
23 BER Degradation 1 [m] Distance Tx Antenna Position Rx Antenna Hight 1 [m] 1.5[m] 2 [m] Wrist Upper Arm Chest Back Slide 23
24 Evaluation of BER Simulation Single Path UWB Coherent Receiver with the Largest Path Selection Correlation loss: 1 to 6 db Fairly Good, because of Less Multipath Condition of Anechoic Chamber Slide 24
25 Conclusions Wideband Channel Measurements for Narrow band or UWB PHY in Less Multipath Anechoic Chamber Environment as a Baseline Study Link Loss and Response Depends on Antenna Position on Body and Height of Base Station Antenna When Link is Blocked by Body: 15 to 25 db Loss Steel Chair Causes Multipath However, Body Masks the Effects of Multipath Simulation: Single Path UWB Coherent Receiver with the Largest Path Selection: Correlation loss: 1 to 6 db Fairly Good, because of Less Multipath Condition of Anechoic Chamber Slide 25
26 Thank you! Slide 26
27 References Slide 27 [1] T. Yamada, T. Kobayashi, H. Matsuda, N. Yamazaki, K. Ohno, T. Ikegami, Evaluation and Compensation of Channel Characteristics around Human Body for UWB System, Technical Report of IEICE, WBS , Mar [2] T. Yamada,K. Ohno, T. Ikegami, Compensation for Frequency Characteristic of UWB Transmission with Multicarrier pulse waves, SITA2006,16.3,Nov [3] K.Ohno,T.Ikegami, Multipath Compensation by Using Template Waveform Processing in UWB Radio, WPMC2005, Sep [4] K.Ohno, T.Ikegami, Interference Mitigation Study for UWB Radio Using Template Waveform Processing, IEEE Transaction on Microwave Theory and Technique, Vol. 54-4, Apr
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