Xem 1-20 trên 36 kết quả Wireless bandwidth
  • The expansion and popularity of the Internet, along with the addition of wireless data functionality to wireless networks, has also contributed greatly to the growth of the wireless industry. In fact, the anticipated consumer demand for high bandwidth wireless data is commonly seen as the driving force behind current network upgrades and expansions. The number and types of companies aggressively investing in wireless technologies illustrate the importance of wireless data.

    pdf234p ken333 14-06-2012 54 23   Download

  • In the maze of wireless networking developments, the one factor often overlooked is the promised throughput capabilities versus the actual bandwidth that is available. Picking up an 802.11g wireless access point and wireless adaptor, you probably expect that you will be getting a bandwidth availability of 54mb-per-second (mbps). Oops. Don’t get too upset when you find out that the actual bandwidth you get is substantially lower. In this paper you will learn why the bandwidth you expect disappears into thin air....

    pdf8p duypha 06-08-2009 56 13   Download

  • Large bandwidth penalty since the subcarriers can’t have perfectly rectangular pulse shapes and still be time-limited. Very high quality (expensive) low pass filters will be required to maintain the orthogonality of the subcarriers at the receiver.

    ppt27p nhq_khtn 07-11-2013 17 2   Download

  • WAP, Wireless Application Protocol aims to provide Internet content and advanced telephony services to digital mobile phones, pagers and other wireless terminals. The protocol family works across different wireless network environments and makes web pages visible on low-resolution and low-bandwidth devices.

    doc5p thachnq 03-06-2011 106 20   Download

  • When a fiber-optic link is neither practical nor feasible, under the above scenario, wireless optical communications (WOC) becomes a real alternative, since it allows to transfer data with high-bandwidth requirements with the additional advantages of wireless systems (Arimoto, 2010; Ciaramella et al., 2009; Sova et al., 2006). Moreover, a wireless optical communication system offers, when compared with RF technology, an intrinsic narrower beam; less power, mass and volume requirements, and the advantage of no regulatory policies for using optical frequencies and bandwidth....

    pdf0p contentnew 12-04-2012 53 19   Download

  • This course is about a communication system which is used to transfer information from a source to a destination. Examples of communication systems are telephones, wireless data access, television and many others.How to transmit the information from a source to a destination. How to evaluate the quality of the received information. What kinds of design goals to consider for a specific application. How to trade-off between various parameters (such as bandwidth and power) due to the design limitations and goals.

    pdf30p huemanvdoc 23-11-2009 93 18   Download

  • The requirements for a network administrator have always been diverse. Get the users connected, make sure there’s enough bandwidth to run applications, keep the network secure, and so on. When problems come up on a traditional network, the solutions have often been fairly straightforward. If users aren’t connected, you connect them. If there’s not enough bandwidth, you buy new equipment. If network resources are vulnerable, you introduce appliances and applications that provide enhanced security. It’s a pretty tight loop of problems and solutions....

    pdf11p huyhoang 06-08-2009 86 15   Download

  • Fiber is on the increase within wireless switching centers as they evolve to meet rising bandwidth demand, requiring modifications to the traditional wireless switching office. With any increase in fiber, developing and maintaining good fiber cable management quickly becomes an important consideration. As wireless switching centers – we’ll refer to them as mobile switching centers (MSCs) in this paper – are being retrofitted to increase density and capability, a good fiber cable management system ensures quality-of-service is maintained....

    pdf4p mylinh 13-08-2009 58 10   Download

  • Wireless communication slowly is becoming reality. In a wireless world, a printer is installed automatically after it is turned on; keyboard and mouse cables no longer become hopelessly tangled; Palm Pilots and mobile telephones automatically synchronize and communicate. Providing this sort of seamless, wireless communication--at a low cost--is the goal of Bluetooth technology. Devices that support Bluetooth automatically communicate with one another when they come within a 30-foot range of each other.

    pdf406p transang5 23-11-2012 27 9   Download

  • In 1991, Mark Weiser described his vision of an emerging world of pervasive, embedded computation. He predicted “a physical world that is richly and invisibly interwoven with sensors, actuators, displays, and computational elements, embedded seamlessly in the everyday objects of our lives and connected through a continuous network.

    pdf425p japet75 30-01-2013 25 5   Download

  • The total bandwidth is divided into many narrowband channels. (200 kHz in GSM) Users are given time slots in a narrowband channel (8 users) Multiple access is orthogonal: users within the cell never interfere with each other. Interference between users on the same channel in different cells is minimized by reusing the same channel only in cells far apart.

    ppt23p nhq_khtn 12-03-2011 34 4   Download

  • 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 Reference Chaser Bandwidth Controller for Wireless QoS Mapping under Delay Constraints

    pdf8p dauphong14 13-02-2012 12 3   Download

  • 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 Adaptive Bandwidth Management and Joint Call Admission Control to Enhance System Utilization and QoS in Heterogeneous Wireless Networks

    pdf11p sting10 07-03-2012 17 2   Download

  • In the past decades a renewed interest has been seen around optical wireless communications, commonly known as free-space optics (FSO), because of the ever growing demand for high-data-rate data transmission as to a large extent current applications, such as the high-definition (HD) contents and cloud computing, require great amount of data to be transmitted, hence, demanding more transmission bandwidth. Nowadays, the last mile problem continuous to be the bottle neck in the global communication network....

    pdf208p contentnew 12-04-2012 61 16   Download

  • An ultrawideband (UWB) pentagon shape planar microstrip slot antenna is presented that can find applications in wireless communications. Combination of the pentagon shape slot, feed line and pentagon stub are used to obtain 124% (2.65–11.30 GHz) impedance bandwidth which exceeds the UWB requirement of 110% (3.10–10.60 GHz). A ground plane of 50 mm 80 mm size is used which is similar to wireless cards for several portable wireless communication devices. The proposed antenna covers only the top 20 mm or 25% of the ground plane length, which leaves enough space for the RF circuitry.

    pdf7p vanminhphuong 18-01-2011 82 14   Download

  • Compressed video streams are intended for transmission over communication networks. With the advance of multimedia systems technology and wireless mobile communications, there has been a growing need for the support of multimedia services such as mobile teleconferencing, telemedicine, mobile TV, distance learning, etc., using mobile multimedia technologies. These services require the real time transmission of video data over fixed and mobile networks of varying bandwidth and error rate characteristics....

    pdf56p doroxon 16-08-2010 57 13   Download

  • Continued cellular market penetration, burgeoning consumer demand for wireless rich media, and the promise of even more data-intensive applications continue to drive bandwidth consumption, fueling an estimated 100 percent increase in the global number of cellular base stations by 2009. 3G and 4G cellular services, which require very low latency and packet-based switching, place additional burdens on existing infrastructure, taxing copper backhaul solutions to their limits.

    pdf8p mylinh 13-08-2009 90 12   Download

  • Consumer and business customers today seek wireless service that is readily accessible, benefit rich, secure and affordable. Voice, data and video services, Internet games, and mobile office access must all be provided to meet growing demand from customers. Rollout of third-generation networks has made real-time information flow of news, music, sports updates, browsing and image sharing a reality that is driving growth and change in the network. The move toward faster service will continue without end and requires that both bandwidth and network locations be increased.

    pdf8p halanh 14-08-2009 68 6   Download

  • Due to rapid growth in the use of wireless communication services and the corresponding scarcity and high cost of radio spectrum bandwidth, it has become increasingly important for cellular network operators to maximize spectrum efficiency. Such efficiency can be achieved by optimal frequency reuse, i.e., the simultaneous use of the same part of the radio spectrum by communication links in different locations of the network.

    pdf23p huggoo 20-08-2010 42 6   Download

  • Protocols for wireless applications Wireless data networks present a more constrained communication environment compared to wired networks. Because of fundamental limitations of power, available spectrum, and mobility, wireless data networks tend to have less bandwidth than traditional networks, more latency than traditional networks, less connection stability than other network technologies, and less predictable availability.

    pdf19p huggoo 20-08-2010 42 6   Download

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