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EE小组 > 大学生学电子 > 科技英语翻译 > [原创] (中+英)The Future Of Wi-Fi, UWB, And The Less Known Wireless Technolog
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楼主 ??[原创]?

[原创] (中+英)The Future Of Wi-Fi, UWB, And The Less Known Wireless Technolog

2011-07-21 16:53

作者:Mike_GS
积分:12164分

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As the cellular generations evolve, so do other wireless technologies. Wi-Fi and Ultra-Wideband (UWB) are well known wireless technologies that are also continuously changing along with the cellular standards as semiconductor and antenna technologies advance.
蜂窝网络在更新换代,其它无线技术也一样。Wi-Fi和超宽带(UWB)这两种广为人知的无线技术也随着半导体和天线技术的进步与蜂窝标准一同变化。
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The most widely used wireless technology Wi-Fi, also known as the IEEE’s 802.11 wireless local-area network (LAN) standard, has changed significantly. When the initial standard 802.11 was introduced in 1997, the maximum data rate was 2 Mbits/s. In 1999, the 802.11b standard emerged to provide up to 11 Mbits/s and launch the first successful WLAN wave.
Wi-Fi,也被称为IEEE 802.11 WLAN标准,是使用范围最广的无线技术,它也有了很大改变。最初的802.11标准诞生于1997年,最高速率为2Mbits/s。1999年,802.11b标准星期,提供11Mbits/s的速率,掀起第一波成功的无线网络浪潮。
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Since then, the modulation/access has changed from direct sequence spread spectrum (DSSS) to orthogonal frequency-division multiplexing (OFDM). Subsequent versions of the standard have used various configurations of OFDM. 802.11a was the first to use it in the 5-GHz band, boosting rates to 54 Gbits/s. 802.11g came next with 54 Gbits/s in the 2.4-GHz band. The most recent version is 802.11n, which boosted rates to over 150 Mbits/s using up to four multiple-input multiple-output (MIMO) streams and wider bandwidth (40 MHz) channels in both the 2.4- and 5-GHz bands.
自此开始,调制/访问从直接序列扩频(DSSS)变为正交频分复用(OFDM)。该标准的后续版本使用了OFDM的多种配置。802.11a是第一个在5GHz频段下使用它的标准,2.4GHz频段下的速率提升至54Gbits/s。接下来802.11g在2.4GHz频段下带来了54Gbits/s的速度。最新标准是802.11n,通过采用最多四条输入输出(MIMO)流以及频宽更大(40MHz)的频道在2.4GHz和5GHz下进一步将速度提升至150Mbits/s。
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Already, the next generation of standards is being finalized—802.11ac and 802.11ad. The next logical extension of the standard beyond the popular 802.11n is 802.11ac. It is expected to use the 5-GHz band to achieve data rates to 1 Gbit/s using the same basic media access control (MAC) and physical layer (PHY) configurations but with some modifications to achieve the higher data rates.
下一代Wi-Fi标准现在已经处于最后的完善阶段——802.11ac和802.11ad。802.11n标准的逻辑延伸是802.11ac。它预期会在5GHz频段下实现最大1Gbit/s的速率。802.11ac的介质访问控制(MAC)和物理层(PHY)配置都与此前相同,不过将通过一些调整来实现更高的速率。
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802.11ac does this by using wider-bandwidth channels of 80 or 160 MHz, whereas the maximum for 802.11n is 40 MHz. This standard also supports up to eight spatial streams of MIMO, whereas 802.11n has a maximum of four. Multi-user MIMO or MU-MIMO is introduced to further boost speeds. The modulation is 256-phase quadrature amplitude modulation (256QAM) instead of the 64-phase quadrature amplitude modulation (64QAM) used by 802.11n.
802.11ac的调整包括采用频宽更广(80或160MHz)的频道,相比之下802.11n的频道只有40MHz。新标准也将支持最多八条MIMO空间流,802.11n仅支持四条。多用户MIMO(MU-MIMO)也将被引入新标准以提升速率。802.11ac还用256位的正交振幅调制(QAM)替代了802.11n所采用的64位QAM。
1楼 ??[原创]? Re: [原创] (中+英)The Future Of Wi-Fi, UWB, And The Less Known Wireless Technolog
2011-07-21 17:02

作者:Mike_GS
积分:12164分

Using single antennas and 80-MHz bandwidth, a user could expect a theoretical peak of 433 Mbits/s with 256QAM. That jumps to 867 Mbits/s with a 2x2 MIMO in an 80-MHz channel. Using a 160-MHz channel and single antennas, a maximum rate of 867 Mbits/s could be achieved. With 2x2 MIMO in 160 MHz, the theoretical rate jumps to 1.73 Gbits/s. Even higher speeds are expected with higher MIMO configurations using the MU-MIMO arrangements. 在采用单天线和80MHz频宽的情况下,256QAM的理论峰值速率可以达到433Mbits/s。在单80MHz天线下采用2x2 MIMO可以进一步将速率提升至867Mbits/s。使用160MHz频道和单天线,最大速率可以达到867Mbits/s。如果在160MHz采用2x2 MIMO,理论速率可以达到1.73Gbits/s。若采用MU-MIMO排布的MIMO配置甚至可以实现更高的速率。 The 802.11ad standard is another high-speed variation using the 60-GHz millimeter-wave band. Data rates up to 7 Gbits/s can be expected. Neither the 802.11ac nor the 802.11ad standard has been finalized as work continues toward a potential ratification in 2012. 802.11ad标准则是采用60GHz毫米波频段的另一种高速变种。数据速率预期最高可达7Gbits/s。802.11ac和802.11ad标准都还没有完成最终化工作,正为在2012年获批准而努力。 Considerable effort was put into developing a UWB wireless standard. While the IEEE standards group 802.15.3a failed to agree on one approach to UWB, several companies developed the OFDM version and have sold chipsets over the past several years. UWB无线网络标准的开发工作也非常可观。IEEE标准工作组802.15.3a未能通过UWB的一种方案,但多家公司还是开发了OFDM版本,并在过去几年里销售相关芯片组。 Only a few viable UWB chip companies still exist, such as Alereon and Wisair. Both produce chips that are used primarily for transmitting compressed video to video monitors, HDTV sets, and other video products. More recently it is being used to connect laptops to larger video monitors and docking stations. 目前只有Alereon、Wisair等少数几家拥有可行的UWB芯片的公司。这两家的芯片主要都被用于向视频监视器、高清电视等视频设备传输压缩后的视频。最近这种技术还被用于笔记本电脑和大型显示器或底座的连接。 UWB uses the 3.1- to 10.6-GHz band and can achieve data rates from 53.3 Gbits/s to as much as 480 Gbits/s at a range of up to 10 meters. The WiMedia Alliance, which defined the standard for UWB, provided for higher data rates in its most recent version 1.5. It supports data rates to 1.024 Gbits/s with simple modifications to the modulation and coding. Eric Boockman, CEO of leading UWB chip supplier Alereon, sees an increasing adoption of the technology where it simplifies video transmissions over short distances. UWB采用3.1-10.6GHz的频段,可以在10米范围内实现53.3-480Mbits/s的数据传输速率。UWB标准的制定者WiMedia联盟在最新的1.5版标准中提供了更高的速率,只需对模块和代码进行简单调整就能实现1.024Gbits/s的数据传输速率。UWB领军供应商Alereon的首席执行官Eric Boockman看到该技术正在越来越多地被接受,因为它简化了短距离视频传输的过程。 Some other lesser-known wireless efforts do exist, with their futures unknown. Streaming video wirelessly is the focus. For example, WiDi is a software option from Intel that uses Wi-Fi (802.11n) to stream video to HDTV sets that have an appropriate compatible accessory receiver. 此外还有些鲜为人知的无线技术努力,但它们前景未卜。无线视频流是一个重点。举个例子,英特尔推出WiDi软件功能,可以通过Wi-Fi网络(802.11n)将视频流传输给装有兼容接收器的高清电视。 ECMA-387 is the European 60-GHz wireless LAN standard. It offers a single-carrier mode with speeds to 6.35 Gbits/s and an OFDM mode that can generate speeds to 4.032 Gbits/s. Its unique MAC conforms to the Open Systems Interconnection (OSI) standards. ECMA-387是欧洲的60GHz WLAN标准。它在单载波模式下可以提供6.35Gbits/s的速率,OFDM模式下可达到4.032Gbits/s。该标准独特的MAC符合开放系统互联(OSI)标准。 And, the Wireless Home Digital Interface (WHDI) is a unique standard for streaming video from computers to HDTV sets. It uses 40-MHz wide channels in the 5-GHz unlicensed band. It also uses OFDM in a version of 802.11a with a unique compression scheme and 5x4 MIMO to achieve a reliable 3-Gbit/s data rate. 此外还有无线家庭数字接口(WHDI),这是一种将视频流从电脑传输到高清电视的独特标准。该标准采用40MHz频道在未获授权的5GHz频段下进行传输。它还通过802.11a的OFDM、独有的压缩方案和5x4MIMO带来3Gbits/s的稳定数据传输。
2楼 ??[原创]? Re: [原创] (中+英)The Future Of Wi-Fi, UWB, And The Less Known Wireless Technolog
2011-09-26 22:19

作者:云汐
积分:6分

呵呵 很好 谢谢分享
最后编辑时间: 2011-09-27 08:40
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