tailieunhanh - Lecture 2 Wireless Environment and Wireless LANs

Lecture Objectives: ● Discuss the impact of the wireless environment on networks ● Explain the concept of spread spectrum, widely used in WLAN technologies | Lecture 2 Wireless Environment and Wireless LANs Wireless Networks and Mobile Systems Lecture Objectives Discuss the impact of the wireless environment on networks Explain the concept of spread spectrum, widely used in WLAN technologies Provide an overview of current fixed and mobile wireless technologies Introduce the basic operation of IEEE and Bluetooth WLANs/WPANs More detailed discussion of operation of such networks will be provided in later lectures Agenda (1) Impact of wireless environment on networks The wireless spectrum Physical impairments Contention for the shared medium Effects of mobility Restrictions on terminal equipment Security Spread spectrum Introduction Frequency Hopping Spread Spectrum Direct Sequence Spread Spectrum Agenda (2) Wireless networks Mobile wireless WANs Fixed wireless WANs WLANs: the family WLANs/WPANs: Bluetooth IEEE Characteristics Modes of operation Association, authentication and privacy Bluetooth Characteristics Comparison

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