Ultra WideBand Channel Models for IPS Choi JeongWon Wireless and Mobile Communication System lab. Information & Communication Engineering dept. Information & Communication Engineering Graduation School, Chosun Univ.

Contents Wireless and Mobile Communication System lab. Information & Communication Engineering dept. 1.Introduction 2.Necessity for channel models 3.Indoor propagation Permitted radiated power 4.IEEE a 5.Channel Modelling 6.Conclusion

Introduction  1960’s Sperry Research development of the UWB technology  1970’s U.S. Patents and demonstration on UWB system  1980’s Time Domain Corporation, Multi Spectral Solutions Inc.  1990’s Aether Wire & Locations, Xtreme Spectrum Inc., Intel  Feb. 14, 2002  FCC approved UWB for the frequency range of GHz  FCC outlined standards for three types of civilian UWB devices, allowed for commercial uses:  Imaging systems including ground penetrating radars, through-the-wall imaging, medical, and surveillance devices  Vehicular radar systems  Communications and measurement systems History Wireless and Mobile Communication System lab. Information & Communication Engineering dept.

Introduction Advantage  Wide bandwidth leads to dual capabilities  High data rate communications  High precision (Sub-centimeter) radar Wireless and Mobile Communication System lab. Information & Communication Engineering dept.

Introduction Advantage  Excellent immunity to interference from other radio systems or multipaths  Extremely difficult to intercept – wide spectrum and lowenergy  Low power and low cost  Simple hardware structure  Typically no carrier  Unlicensed for communications and measurement use Wireless and Mobile Communication System lab. Information & Communication Engineering dept.

Introduction Signaling  Why use narrow pulses for the UWB signaling?  Wide bandwidth increase the capacity  Multipath immunity  Low hardware complexity, low power  Pulse shapes  Gaussian pulse  Gaussian monopulse  Gaussian doublet  Doublet with separated monopulses Wireless and Mobile Communication System lab. Information & Communication Engineering dept.

Introduction Applications Wireless and Mobile Communication System lab. Information & Communication Engineering dept.

Necessity for channel models  UWB wireless communication system to share frequency band that it uses the existing wireless communication system.  In complex RF environment, interference problem between the different narrow band RF  communication system.  Technology to exclude interference  Analysis of the propagation characteristic  Limit the propagation interference Wireless and Mobile Communication System lab. Information & Communication Engineering dept.

Indoor propagation Permitted radiated power Emission Limits Frequency Band(MHz)Indoor applications 960 – [dBm] 1610 – [dBm] 1990 – [dBm] 3100 – [dBm] – [dBm] – [dBm] Above [dBm] Wireless and Mobile Communication System lab. Information & Communication Engineering dept.

IEEE a UWB for Location tracking SG 15.4a Alt PHY (Location awarenss) SG 15.4a Alt PHY (Location awarenss) Wireless and Mobile Communication System lab. Information & Communication Engineering dept. WPAN IEEE WPAN IEEE (Task Group) TG 15.1 Bluetooth (Task Group) TG 15.1 Bluetooth TG 15.2 Coexistence TG 15.2 Coexistence TG 15.5 Mesh Network TG 15.5 Mesh Network TG15.3 High Data Rate Mac & 2.4GHz PHY TG15.3 High Data Rate Mac & 2.4GHz PHY TG 15.3a Alt PHY(UWB) TG 15.3a Alt PHY(UWB) TG 15.3b MAC Maintenance TG 15.3b MAC Maintenance TG 15.3c Alt PHY (mmWave-Gbps) TG 15.3c Alt PHY (mmWave-Gbps) TG 15.4 Low Data Rate (Zigbee) TG 15.4 Low Data Rate (Zigbee) SG 15.4b 15.4 Revision SG 15.4b 15.4 Revision

IEEE a UWB for Location tracking Wireless and Mobile Communication System lab. Information & Communication Engineering dept.

IEEE a UWB for Location tracking Wireless and Mobile Communication System lab. Information & Communication Engineering dept.  IEEE a is an amendment to IEEE specifying additional physical layers to original standard  The principal interest was in providing higher precision ranging and location capability Higher aggregate throughput, longer range, low power consumption and coast  The selected baselines are two optional PHYs consisting of a IR-UWB (operating in unlicensed UWB spectrum) and a Chirp Spread Spectrum (CSS) (operating in unlicensed 2.4 GHz spectrum).  For the IR-UWB option, there is an optional ranging capability, where as the CSS signals can only be used for data communication

Channel Modelling IEEE a Wireless and Mobile Communication System lab. Information & Communication Engineering dept.  UWB Channel Modelling is to model the path loss and multipath modelling in typical environment IEEE a devices are operable.  It can be used to evaluate the performance of the UWB PHY layer.  In order to model all the environment to be expressed in the form that includes a number of parameters as follows.  RMS(Root Mean Square) delay spread  Power decay profile  Number of multipath components

Channel Modelling Saleh-Valenzuela’s indoor propagation channels Wireless and Mobile Communication System lab. Information & Communication Engineering dept.  This model is a statistical model whose basic assumption is that multipath components (MPCs) arrive in clusters, formed by the multiple reflections from the objects in the vicinity of receiver and transmitter.  Only for indoor scenarios Typical impulse response

Wireless and Mobile Communication System lab. Information & Communication Engineering dept. Channel Modelling Model parameterCM1CM2CM3CM4 Mean excess delay(nsec) RMS delay(nsec) Cluster reach rate(1/nsec) Ray reach rate(1/nsec) Cluster attenuation element Ray attenuation element

Wireless and Mobile Communication System lab. Information & Communication Engineering dept. Channel Modelling

Wireless and Mobile Communication System lab. Information & Communication Engineering dept. Channel Modelling Impulse response characteristics of CM1~CM4

Wireless and Mobile Communication System lab. Information & Communication Engineering dept. Channel Modelling Mean excess delay for the CM1~CM4

Wireless and Mobile Communication System lab. Information & Communication Engineering dept. Channel Modelling Number of paths within 10dB for the CM1 ∼ CM4

Wireless and Mobile Communication System lab. Information & Communication Engineering dept.Conclusion UWB system should be designed. considering the complexity of the receiver and Line-of-sight & non-line distance.

Reference [1] Aawatif Menouni Hayar, Giorgio M. Vitetta, “Channel Models for Ultra-Wideband Communications : an Overview”, Eurecom Institute, Sophia Antipolis, France - CNIT, University of Modena and Reggio Emilia, Italy [2] Kazimierz Siwiak, Debra McKeown, “ultra-wideband radio technolohy”, WILEY, pp , 2004 [3] Seong-Kyu Kim, “A Study of UWB Channel Modeling in Indoor Radio Environment”, Pukyong National University, Feb 2007 [4] A. A Saleh and R A. Valenzuela, “Astaristical model for indoor multipath propagation”, IEEE J, select Areas Commun, vol 5, pp , Feb 1987 [5] Deock-Ho Ha, Young-Hwan Lee, “The Implementation of A Modified Channel Model Simulator for UWB System in Indoor Radio Propagation Environment“, Pukyong National University, KETI, Apr 2011 Wireless and Mobile Communication System lab. Information & Communication Engineering dept.

Interface Thank you for your attention Wireless and Mobile Communication System lab. Information & Communication Engineering dept.