2830 IEEE802.11n LAN RSSI throughput 4) 5) IEEE802.11b/g/a LAN LAN IEEE802.11n OFDM Orthogonal Frequency Division Multiplexing MIMO Multi Input Multi
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1 Vol. 52 No (Sep. 2011) IEEE802.11n LAN RSSI throughput LAN IEEE802.11n 2.4 GHz LAN RSSI 2 MIMO 2.4 GHz RSSI RSSI FDTD RSSI RSSI RSSI Relations of RSSI and Average Throughput of IEEE802.11n Wireless LAN System Tomotsugu Hasegawa, 1 Hirokazu Takeno, 1 Yuto Nakatsu 1 and Manabu Omiya 2 rooms in the same floor. This paper discusses indoor propagation characteristics of a commercial wireless LAN system operating in the 2.4 GHz band and derives the relationship between received signal strength indication (RSSI) and average throughput based on the measured and calculated indoor propagation characteristics in several radio environments. As a result, we obtain a linear relationship between them. It means that the device does not give sufficient MIMO characteristics because of the operating frequency band and the structural constraints of compact wireless handset. However the derived formula predicts values of data throughput in arbitrary places from the RSSI distributions simulated numerically. The manner combining the approximate equation with the numerical simulation is useful to design the number of access points as well as their locations required to build a wireless network. 1. LAN Local Area Network IEEE802.11n ) 2.4 GHz/5 GHz LAN IEEE802.11n AP Access Point 1 AP 2),3) ARIB ARIB STD-T66 / LAN 2.4 GHz 2) 2,400 MHz 2,483.5 MHz 5MHz 10 mw/mhz IEEE802.11n 40 MHz 300 Mbps AP Recently, a high-power and high-speed wireless LAN router based on IEEE802.11n standard with a data transmission rate of 300 Mbps has been developed. Using this equipment as an access point makes it possible to build easily wireless networks including a few floors in the adjacent as well as several 1 Graduate School of Information, Science and Technology, Hokkaido University 2 Information Initiative Center, Hokkaido University 2829 c 2011 Information Processing Society of Japan
2 2830 IEEE802.11n LAN RSSI throughput 4) 5) IEEE802.11b/g/a LAN LAN IEEE802.11n OFDM Orthogonal Frequency Division Multiplexing MIMO Multi Input Multi Output MIMO- OFDM 6) 8) 6) 7),8) MIMO 5GHz 4 4 4MIMOOFDM LAN LAN IEEE802.11n 2.4 GHz LAN 2 RSSI Received Signal Strength Indication RSSI RSSI MIMO-OFDM 9),10) RSSI RSSI FDTD Finite Difference Time Domain 11) RSSI 4 2 LAN 3 LAN RSSI FDTD RSSI RSSI RSSI 4 2. LAN 1 AP WZR-HP-G300NH 12) 2.4 GHz IEEE802.11n 3 3 MIMO-OFDM 40 MHz 300 Mbps 300 Mbps 6 Mbps 7 2,442 MHz MHz AP 170 mm 150 mm 20 mm 70 mm 2 30 mm 1 3 (a) (b) AP (a) (b) AP PC 2 AP 1000Base- T PC SONY VAIO VPCX11AVJ Intel Atom Z GHz 2GB OS Microsoft Windows XP Professional SP3 IEEE802.11n PC Panasonic Let s Note CF-T5 Intel Core Duo U GHz
3 2831 IEEE802.11n LAN RSSI throughput 1.5 GB OS Microsoft Windows Vista Ultimate SP2 PC USB2.0 LAN WLI-UC-G300HP 2 16 mm 0.13 PC 1(a) RSSI WiFi inssider Iperf TCP Window Size 64 kb RSSI m 2 1(a) AP 3 AP1 RSSI 3 RSSI 2 B H 7 3 A H 8 4 A H 8 23 RSSI 1 (a) AP (b) AP Fig. 1 A setup of experimental equipments. AP attached under the roof in the path (a) and AP in the room (b). y =1.0x 83.9 (1) y RSSI dbm x Mbps 0 (1)
4 2832 IEEE802.11n LAN RSSI throughput 3 Fig. 3 AP1 RSSI RSSI and average throughput for AP1. 2 WLAN Fig. 2 A small-scale office environment for WLAN. RSSI 0.99 MIMO-OFDM RSSI RSSI (1) 2.4 GHz (2) 0.13 (3) 2 (4) AP 3 AP2 4 RSSI 3 A H 8 4 A H 8 16 AP2 AP1 RSSI 4 AP2 RSSI Fig. 4 RSSI and average throughput for AP2. y =1.0x 84.9 (2) (2) (1) 1 RSSI
5 2833 IEEE802.11n LAN RSSI throughput Table 1 1 Electric constants of media. FDTD 14) 5 (a) (b) m m m 5 (a) (b) Fig. 5 A numerical model. An overview (a) and an inner view in the 3rd floor (b). 40 db AP RSSI FDTD 11),13) FDTD 5),14) 15) mm AP 2 30 mm AP 7 2,442 MHz sec PML 16),17) 6 RSSI RSSI AP
6 2834 IEEE802.11n LAN RSSI throughput Fig. 7 7 WLAN #1 A large-scale office environment #1 for WLAN. 3.2 # B C AP AP4 AP3 1.8 m 0.82 m A, B, C, D E, F AP4 9 A-B-C-D-A AP3 E-C-D-F 30 m AP3 AP4 RSSI 3 4 RSSI 6 RSSI (a) AP1 (b) AP2 Fig. 6 Comparison of calculated RSSI with measurements for the cases of AP1 (a) and AP2 (b). RSSI 3 4 RSSI AP RSSI y =1.0x 84.2 (3) y =1.0x 85.7 (4)
7 2835 IEEE802.11n LAN RSSI throughput 8 RSSI (a) AP3 (b) AP4 Fig. 8 RSSI and average throughput for AP3 (a) and AP4 (b). Fig. 9 9 RSSI (a) AP3 (b) AP4 Comparison of calculated RSSI with measurements for the cases of AP3 (a) and AP4 (b). (4) (3) 1.5 db 8(b) RSSI 70 dbm 9 RSSI 9 (a) 9 RSSI
8 2836 IEEE802.11n LAN RSSI throughput 10 WLAN #2 Fig. 10 A large-scale office environment #2 for WLAN. 12 Fig. 12 AP5 RSSI RSSI and average throughput for AP5. 11 Fig. 11 AP5 An access point AP5. RSSI 3.3 # AP 10 AP5 13 AP5 RSSI Fig. 13 Comparison of calculated RSSI with measurements for AP5. AP A M 12 RSSI RSSI
9 2837 IEEE802.11n LAN RSSI throughput Fig RSSI Relations of RSSI and average throughput in several office environments. y =1.0x 85.7 (5) 13 RSSI RSSI 10 D-C-B K-F-G-H 2 D K AP5 D K RSSI RSSI C AP5 D K RSSI Fig (a) (b) 1 (c) 2 Residential two-story house. An overview (a), first floor (b) and second floor (c).
10 2838 IEEE802.11n LAN RSSI throughput RSSI 2dB RSSI 14 y =1.0x 84.5 (6) 0.94 AP RSSI (a) (b) (c) AP 15 (a) 1 1m AP6 2 AP7 AP6 15 (a) 37 AP7 (b) (c) A J 30.5 m AP6 AP7 RSSI 16 RSSI y =1.0x 85.8 (7) AP6 AP7 RSSI 70 dbm 23 Mbps MIMO-OFDM 16 RSSI Fig. 16 Relations of RSSI and average throughput in the residential home environment. 17 AP7 RSSI Fig. 17 Comparison of calculated RSSI with measurements for AP7. (7) (1) (6) 17 AP7 RSSI
11 2839 IEEE802.11n LAN RSSI throughput 5mm H AP7 1 RSSI 4. IEEE802.11n MIMO-OFDM LAN LAN IEEE802.11n 2.4 GHz LAN RSSI RSSI y =1.0x RSSI 40 db FDTD RSSI RSSI RSSI RSSI MIMO GHz IEEE802.11n 5GHz LAN HITACHI SR11000 K1 C ) / LAN ARIB STD-T (2010). 2) LAN (2004). 3) Nee, R.V., Jones, V.K., Awater, G., Zelst, A.V., Gardner, J. and Steele, G.: The n MIMO-OFDM Standard for Wireless LAN and Beyond, Wireless Personal Communications, Vol.37, pp (2006). 4) Kim, N.: IEEE MAC Performance with Variable Transmission rates, IEICE Trans. Commun., Vol.E88-B, No.9, pp (2005). 5) Harris, L.R., Hikage, T. and Nojima, T.: Using Large-Scale FDTD Method to Obtain Precise Numerical Estimation of Indoor Wireless Local Area Network Office Environment, IEICE Trans. Fundamentals of Electronics, Communications and Computer Sciences, Vol.E92-A, No.9, pp (2009). 6) Sakaguchi, K., Chua, H.-Y.-E. and Araki, K.: MIMO Channel capacity in an Indoor Line-of-Sight (LOS) Environment, IEICE Trans. Commun., Vol.E88-B, No.7, pp (2005). 7) Iwai, H., Sakata, T., Yamamoto, A. and Sakaguchi, K.: 3-D Angular Spectrum Measurements at 5 GHz in a Residential Two-Story House, IEICE Trans. Commun., Vol.E90-B, No.9, pp (2007). 8) Tran, G.K., Dao, N.D., Sakaguchi, K., Araki, K., Iwai, H., Sakata, T. and Ogawa, K.: Performance Analysis of MIMO Schemes in Residential Home Environment via Wideband MIMO Propagation Measurement, IEICE Trans. Fundamentals, Vol.E93-A, No.4, pp (2010). 9) MIMO B Vol.J88-B, No.9, pp (2005). 10) Zvanovec, S., Pechac, P. and Klepal, M.: Wireless LAN Networks Design: Site Sur-
12 2840 IEEE802.11n LAN RSSI throughput vey or Propagation Modeling?, Radioengineering, Vol.12, No.4, pp (2003). 11) Taflove, A. and Hagness, S.C.: Computational Electrodynamics, the Finite- Difference Time-Domain Method, Third Edition, Chapter 5, Incident wave source conditions, pp , Artech House, Boston (2005). 12) WZR-HP-G300NH ( ) ) Yee, K.S.: Numerical Solution of Initial Boundary Value of Problems Involving Maxwell s Equations in Isotropic Media, IEEE Trans. Antennas Propag., Vol.14, No.5, pp (1966). 14) Hasegawa, T., Shoji, T., Omiya, M. and Hikage, T.: A Numerical Analysis of Cumulative Probability of Incident Wave Indoor Propagation, 2008 International Symposium of Antennas and Propagation (ISAP 2008 ), TP-A03, , pp (2008). 15) Taguchi, K., Uchiya, M., Kashiwa, T., Hirayama, K., Kuribayashi, H. and Komatsu, S.: FDTD Large-Scale Parallel Supercomputing and Its Application to the Analysis of Radiation Characteristics of an Antenna Mounted on a Vehicle, Int. J. RF and Microwave Computer-Aided Engineering, Vol.14, No.3, pp (2004). 16) Sullivan, D.M.: Electromagnetic Simulation Using the FDTD Method, IEEE Press, New York (2000). 17) Sullivan, D.M.: An Unsplit Step 3-D PML for Use with FDTD Method, IEEE Microwave and Guided Wave Letters, Vol.7, No.7, pp (1997). ( ) ( ) 2011 Jet FDTD CAD LAN IEEE 2010 IEEE 2010 IEEE CAD Jet FDTD IEEE
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