1、外文翻译 - 超宽带技术的短期或中期范围内的无线通信外文文献原文Ultra-Wideband Technology for Short-or Medium-RangeWireless CommunicationsJeff Foerster, Intel Architecture Labs, Intel Corp.Evan Green, Intel Architecture Labs, Intel Corp.Srinivasa Somayazulu, Intel Architecture Labs, Intel Corp.David Leeper, Intel Connected Product 。

2、s Division, Intel Corp. Index words: UWB, wireless, communications, LAN, PANABSTRACTUltra-Wideband (UWB) technology is loosely defined as any wireless transmission scheme that occupies a bandwidth of more than 25% of a center frequency, or more than 1.5GHz. The Federal CommunicationsCommission (FCC) 。

3、 is currently working on setting emissions limits that would allow UWB communication systems to be deployed on an unlicensed basis following the Part 15.209 rules for radiated emissions of intentional radiators, the same rules governing the radiated emissions from home computers, for example. This r 。

4、ule change would allow UWB- enabled devices to overlay existing narrowband systems, which is currently not allowed, and result in a much more efficient use of the available spectrum. Devices could, in essence, fill in the unused portions of the frequency spectrum in any particular location.1These re 。

5、cent developments by the FCC give Intel a unique opportunity to develop equipment that could potentially take advantage of the vast amount of usable spectrum that exists in the wireless space, and that could provide an engine to drive the future high-rate applications that are being conceived throug 。

6、hout this industry.Intel? Architecture Labs (IAL) is currently researching UWB technology in order to better understand its benefits, limitations, and technical challenges when used for high-rate communications. This paper introduces the reader to this technology, from potential applications to regu 。

7、latory hurdles, to possible implementations and future challenges.INTRODUCTIONUltra-Wideband (UWB) technology has been around since the 1980s, but it has been mainly used for radar-based applications until now (see 1 and the references therein), because of the wideband nature of the signal that resu 。

8、lts in very accurate timing information. However, due to recent developments in high-speed switching technology, UWB is becomingdetailed in themore attractive for lowcost consumer communications applications (asImplementation Advantages ” section of this paper).Intel Architecture Labs (IAL) is curre 。

9、ntly working on an internally funded research project whose intent is to further explore the potential benefits and future challenges for extending UWB technology into the high-rate communications arena.Although the term Ultra-Wideband (UWB) is not very descriptive, itdoes help to separate this tech 。

10、nology from more traditionalwideband” systems typicallynarrowband” systems as well as newer referred to in theliterature describing the future 3G cellular technology. There arenarrowband” ortwo main differences between UWB and otherwideband” systems. First, the bandwidth of UWB systems, as defined b 。

11、y the Federal Communications Commission (FCC) in 2, is more than 25% of a center frequency or more than 1.5GHz. Clearly, this bandwidth is much greater than the bandwidth used by any current technology for communication. Second, UWB is typically implemented in a carrierlessfa shion. Conventional“nar 。

12、rowband” and “wideband” systems use RadioFrequency (RF) carriers to move the signal in the frequency domain from baseband to the actual carrier frequency where the system is allowed to operate. Conversely, UWB implementations can directly modulate animpulse ” that has a very sharp rise and fall time 。

13、, thus resulting in a waveform that occupies several GHz of bandwidth. Although there are other methods for generating a UWB waveform (using a chirped signal, for example), in this paper, we focus on the impulse-based UWB waveform. but, first, a breakdown of how this paper is organized. WIRELESS ALT 。

14、ERNATIVESIn order to understand where UWB fits in with the current trends in wireless communications, we need to consider the general problem thatcommunications systems try to solve. Specifically, if wireless were an ideal medium, we could use it to send.1. a lot of data,2. very far,3. very fast,4.。

15、for many users,5. all at once.Unfortunately, it is impossible to achieve all five attributes simultaneously for systems supporting unique, private, two-way communication streams;
one or more have to be given up if the others are to do well. Original wireless systems were built to bridge large distan 。

16、ces in order to link two parties together. However, recent history of radio shows a clear trend toward improving on the other four attributes at theexpense of distance. Cellular telephony is the most obvious example, covering distances of 30 kilometers to as little as 300 meters. Shorter distances a 。

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标题：外文|外文翻译-超宽带技术的短期或中期范围内的无线通信