Xem 1-20 trên 96 kết quả Wireless local
  • Mạng LAN không dây viết tắt là WLAN (Wireless Local Area Network), là một mạng dùng để kết nối hai hay nhiều máy tính với nhau mà không sử dụng dây dẫn. WLAN dùng công nghệ trải phổ, sử dụng sóng vô tuyến cho phép truyền thong giữa các thiết bị trong một vùng nào đó còn được gọi là Basic Service Set. Nó giúp cho người sử dụng có thể di chuyển trong một vùng bao phủ rộng mà vẫn kết nối được với mạng....

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  • Được phê chuẩn của IEEE 802.11 vào năm 1999, đến nay Wireless Local Area Network (WLAN) đã trở lên phát triển mạnh trên thế giới, tuy nhiên ở một số nước mà nền công nghệ thông tin mới phát triển như ở Việt Nam hiện nay thì WLAN vẫn còn là một công nghệ khá mới mẻ cần được nghiên cứu và đầu tư thích đáng...

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  • Mạng LAN không dây viết tắt là WLAN (Wireless Local Area Network), là một mạng dùng để kết nối hai hay nhiều máy tính với nhau mà không sử dụng dây dẫn. WLAN dùng công nghệ trải phổ, sử dụng sóng vô tuyến cho phép truyền thong giữa các thiết bị trong một vùng nào đó còn được gọi là Basic Service Set.

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  • A wireless local area network (WLAN) is exactly like a regular local area network (LAN), except that each computer in the WLAN uses a wireless device to connect to the network. Computers in a WLAN share the same frequency channel and SSID, which is an identification name shared by the wireless devices belonging to the same wireless network.

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  • The provision of wireless access to the Public Switched Telephone Network (PSTN) from a customer premises is known as Wireless Local Loop (WLL). The potential markets of application of WLL range from developing countries to developed ones. In both cases, the liberalization of the telecommunications market has allowed competition among operators around the world. Many communities of difficult access are still waiting for basic telephone service, which could be viable only by wireless technology, which, besides, offers a fast and cost-effective option....

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  • In this chapter, combined trellis coded quantization/modulation scheme is introduced for wireless local loop environment modelled with realizable and practical medium parameters. The performance analysis of the combined system is carried out through the evaluation of signal-to-quantization noise ratio (SQNR) versus signal-to-noise ratio (SNR) curves and bit error probability upper bounds. Simulation studies confirm the analytical results.

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  • Due to faster deployment and lower cost of wireless local loop (WLL) infrastructure as compared to a wired one, worldwide roll-out of WLL service has been highly anticipated. Most of WLL systems deployed so far belong to narrowband systems mainly aimed at providing voice service. These systems can be used as a bypass of wire-line local loop in dense areas and as an extension of existing telephone network in remote areas. In recent years, media-rich content of Internet has put speed pressure on the local loop.

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  • Wireless local loop (WLL) or fixed wireless access systems are attractive solutions to the so-called last mile problem because of their low capital cost, fast network deployment capability and low maintenance cost [1]. They would, therefore, be effective during the transition period from fibre to the curb (FTTC) to fibre to the home (FTTH). WLL has the potential of becoming a major competitor of local exchange networks, cable television (CATV) networks

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  • Wireless Local Loop (WLL) systems offer quick deployment, high data rates and dynamic capacity. These should be compelling reasons for WLL System to supplant wired systems. WLL systems are having only limited success in displacing wired systems because wired systems provide proven reliability at lower cost. Will this always be true? This chapter addresses that one technology path designers can follow to reduce WLL system cost, especially for the more numerous low data rate and voice user.

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  • The need for providing telecommunication services is growing faster than ever. For this purpose Wireless Local Loop (WLL) also known as Fixed Wireless Access (FWA) Networks is an effective alternative to the problematic wired system. Compared to mobile systems, FWA networks provide two-way communication services to near-stationary users within a small area [8]. The next section presents an overview of multiple access schemes. Channel allocation strategies are described in the second part of the section. The emphasis here is on fixed and dynamic channel allocation schemes....

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  • Recently, many telecommunications operators have been looking for wireless technology to replace parts of the hard-wire infrastructure. The wireless local loop (WLL) technology [1] is considered as the most fitting solution as radio systems can be rapidly developed, easily extended, and are distance insensitive. Since a WLL eliminates the needs (such as wires, poles and ducts) essential for a wired network, it can significantly speed up the installation process. A typical WLL system may consist of hundreds or thousands of base stations (BSs).

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  • Wireless Local Loop (WLL) is projected to experience phenomenal growth over the next years. The nature of WLL is such that terminals are not mobile and once installed the subscriber expects trouble-free operation without any service requirements. Meanwhile, new functionality involving enhanced codecs and modems are being developed and expected to be made available to the subscriber. A major challenge facing WLL operators consists of upgrading WLL terminals that are already deployed at the customer site with new functionality [1,3].

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article LCMV Beamforming for a Novel Wireless Local Positioning System: Nonstationarity and Cyclostationarity Analysis

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  • The focus of interest is the multiple access technology that will be employed in Wireless Local Loop (WLL) systems, here referred to as Fixed Wireless Access (FWA) networks. The discussion of whether to employ Code Division Multiple Access (CDMA) or Time Division Multiple Access (TDMA) has gone on for a long time with no result to be expected in the near future. In this chapter, a capacity comparison for FWA based on two access technologies is performed. The TDMA system is analysed with the help of a simulator in chapter by S. V. Krishnamurthy et al. [8]....

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Frame-Aggregated Link Adaptation Protocol for Next Generation Wireless Local Area Networks

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Achievable Throughput-Based MAC Layer Handoff in IEEE 802.11 Wireless Local Area Networks

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  • IEEE 802.11 is a set of standards for implementing wireless local area network (WLAN) computer communication in the 2.4, 3.6, 5 and 60 GHz frequency bands. They are created and maintained by the IEEE LAN/MAN Standards Committee (IEEE 802). The base version of the standard was released in 1997 and has had subsequent amendments. These standards provide the basis for wireless network products using the Wi-Fi brand.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: TCP-based window-size delegation method for TXOP Exchange in wireless local area networks

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article SmartMIMO: An Energy-Aware Adaptive MIMO-OFDM Radio Link Control for Next-Generation Wireless Local Area Networks

    pdf15p sting10 07-03-2012 17 2   Download

  • Chapter 6 - Wireless internet and m-business. In this chapter we will discuss: Wireless devices, m-business, wireless internet access, wireless web technology, software applications for wireless devices, wireless local area networks (WLANs), bluetooth, wireless communications, location tracking, future of wireless internet.

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