wireless body area network powerpoint

Ngày tải lên: 19/06/2014, 08:20

Ngày tải lên: 19/06/2014, 10:20

Ngày tải lên: 01/09/2013, 10:30

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Ngày tải lên: 01/08/2014, 07:21

... using SIR • Then they shift to FIR speed Wireless Communications Low Rate Wireless Personal Area Networks 2 Objectives • Describe a wireless personal area network (WPAN) • List the different WPAN ... work • Describe the security features of low-rate WPAN technology 3 What is a WPAN? • Wireless personal area network (WPAN) – Group of technologies that are designed for short- range communications – Eliminates ... devices • Include – Bluetooth – 802.15.4 (ZigBee) 12 Bluetooth Protocol Stack (continued) 14 Bluetooth Protocol Stack (continued) • Network topologies (continued) – Scatternet • Group of piconets in which connections exist between...

Ngày tải lên: 13/09/2012, 10:52

... corrected – Also called error correction (FEC) Wireless# Guide to Wireless Communications 26 Mesh Networking (802.15.5) (continued) Wireless# Guide to Wireless Communications 28 How UWB Works • UWB ... are present in the same order in every frame Wireless# Guide to Wireless Communications 15 802.15.3 Network Topology (continued) Wireless# Guide to Wireless Communications 27 Ultra Wide Band (UWB) • Allows ... and storage Wireless# Guide to Wireless Communications 32 How UWB Works (continued) Wireless# Guide to Wireless Communications 18 Additional MAC Layer Functionality (continued) Wireless Communications Chapter...

Ngày tải lên: 13/09/2012, 10:52

... wired network interface port • AP functions – Wireless communications base station – Bridge between the wireless and wired networks 6 Wireless Network Interface Card (continued) 5 Wireless Network ... of wireless clients and an AP • Extended Service Set (ESS) – Two or more BSS wireless networks installed in same area – Provides users with uninterrupted mobile access to the network • All wireless ... communicate among themselves Wireless Communications Wireless Local Area Networks 4 WLAN Components • Minimal hardware needed for a WLAN – Computer – ISP – Wireless network interface card – Access...

Ngày tải lên: 13/09/2012, 10:52

... WMAN? • Wireless metropolitan area networks (WMANs) – Provide wireless connectivity across a substantial geographical area such as a large city • WMANs primary goals – Extend wired networks ... Wireless Communications Wireless Metropolitan Area Networks 14 Multichannel Multipoint Distribution Service (MMDS) • Multichannel multipoint distribution service (MMDS) – Fixed broadband wireless ... same network • WiMAX MAC layer makes it easy for carriers to deploy the network • Range of a WiMAX network is measured in miles • Cellular phone operators can easily incorporate WiMAX networks 3 What...

Ngày tải lên: 13/09/2012, 10:52

... 1xEVDO • For 2.5G CDMA2000 1xRTT networks 25 Binary Runtime Environment for Wireless (BREW) • BREW is a thin software environment – Very small program that resides on a wireless device • Capable ... frequency channels • Supports 144 Kbps packet data transmission 2 Objectives • Describe wireless wide area networks (WWANs) and how they are used • Describe the applications that can be used on ... technologies 16 2.5 Generation Cellular Telephony (continued) • 2.5G network technologies – General Packet Radio Service (GPRS) • For TDMA or GSM 2G networks • Uses eight time slots in a 200 KHz spectrum and...

Ngày tải lên: 13/09/2012, 10:52

... nhất được nhận dạng bởi thiết bị hai đầu. 5.4 CÔNG NGHỆ VLAN: VLAN là viết tắt của Virtual Local Area Network hay còn gọi là mạng LAN ảo. Một VLAN được định nghĩa là một nhóm logic các thiết bị ... hình native VLAN thì phải cấu hình ở giao diện vật lý. CHƯƠNG II LÝ THUYẾT VỀ MẠNG WAN (WIDE AREA NETWORK) I. KHÁI NIỆM : Là mạng được thiết lập để liên kết các máy tính của hai hay nhiều khu ... trí rất xa nhau, ví dụ như những quốc gia khác nhau, thì khi đó ta có mạng diện rộng WAN(Wide Area Network) Trang NGUYỄN ĐÌNH CÔNG – 36CLTH 2929 V./. CÁC CÔNG NGHỆ MẠNG LAN : 5.1. CÔNG NGHỆ CHUYỂN...

Ngày tải lên: 25/04/2013, 11:58

... improve- ments. 9.7 Summary In this chapter we cover the area of Wireless Local Area Networks by focusing on a number of issues: † WLAN topologies. The two types of wireless LAN topologies used today are the ... Local Access: Wireless LAN and Wireless ATM, IEEE Commu- nications Magazine, November, 1997, 34–40. [15] Geier J. Wireless LANs, Implementing Interoperable Networks, Macmillan Network Architecture ... Control Protocol for Wireless Data Networks, in Proceedings of IEEE GLOBECOM, 1993, pp. 1713–1717. [9] Chen K C. and Lee C H. Group Randomly Access Polling for Wireless Data Networks, in Proceedings...

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Ngày tải lên: 17/02/2014, 15:30

... for 802.3) at 10Mbps ❚ 50 ohm cable Wireless LANs ❚ Mobility ❚ Flexibility ❚ Hard to wire areas ❚ Reduced cost of wireless systems ❚ Improved performance of wireless systems William Stallings Data ... performance of wireless systems William Stallings Data and Computer Communications Chapter 13 Local Area Network Technology LLC Protocol ❚ Modeled after HDLC ❚ Asynchronous balanced mode to support ... constant ❚ Significant increase in maximum ring size Wireless LAN Applications ❚ LAN Extension ❚ Cross building interconnection ❚ Nomadic access ❚ Ad hoc networks ...

Ngày tải lên: 06/03/2014, 09:21

... can be implemented to increase network security. There are two primary types of IDS: network based and host-based. The network based system acts similarly to a network level firewall. It cannot ... information about the network con- figuration. Authentication, especially of exter- nal BACnet users. Network Layer Attacks I-Am-Router- To -Network The I-Am-Router-To -Network message can ... traffic across the untrusted network (LAN/Internet). • As a router, separates the trusted network from the untrusted and thus can act as a BACnet firewall, performing network layer or application...

Ngày tải lên: 14/03/2014, 22:20

... nodes )(2 drvcmpbusprop tttt     10/14/2012 28 10/14/2012 30 10/14/2012 1 CAN Controller Area Network 10/14/2012 33 Given: • CPU oscillator frequency = 32 MHz • Bit rate = 800 Kbps • Prescaler= ... transmission of a message, a maximum of five consecutive bits may have the same polarity. • The bit-stuff area in a CAN bus frame includes the SOF, Arbitration field, Control field, Data field and CRC...

Ngày tải lên: 18/03/2014, 06:20