analysis and customization of web based electronic catalogs

... a vision of 4G and future mobile and wireless systems Such systems target the market of 2010 and beyond, aiming to offer support to mobile applications demanding data rates of 50 Mbps and beyond ... used in most of today’s OFDM systems, the ‘C’ is redundant Wideband OFDM (WOFDM) is a variant of OFDM where the spacing between carriers is wider in an effort to alleviate the problem of frequency ... 4G and Beyond and Related Research Issues Since 4G systems target the market of 2010 and beyond, there is time for 4G research and standards development So far, no 4G standard has been defined and...

Ngày tải lên: 29/09/2013, 21:20

... and so on As mentioned earlier, an OFDM scheme can be considered as an economical implementation of a MC system One of the salient features of OFDM is its simplified base band implementation of ... Associate Professor of Electrical and Computer Engineering and the Director of Graduate Studies at the University of Missouri-Columbia from 1997 to 1999 Prior to joining the University of Missouri, ... Networks, Design and Analysis of Computer Systems, Wireless Communications and Computing, and Optical Networking He currently serves on the editorial boards of many national and international...

Ngày tải lên: 03/06/2014, 01:05

... and so on As mentioned earlier, an OFDM scheme can be considered as an economical implementation of a MC system One of the salient features of OFDM is its simplified base band implementation of ... Associate Professor of Electrical and Computer Engineering and the Director of Graduate Studies at the University of Missouri-Columbia from 1997 to 1999 Prior to joining the University of Missouri, ... Networks, Design and Analysis of Computer Systems, Wireless Communications and Computing, and Optical Networking He currently serves on the editorial boards of many national and international...

Ngày tải lên: 27/06/2014, 14:20

... and so on As mentioned earlier, an OFDM scheme can be considered as an economical implementation of a MC system One of the salient features of OFDM is its simplified base band implementation of ... Associate Professor of Electrical and Computer Engineering and the Director of Graduate Studies at the University of Missouri-Columbia from 1997 to 1999 Prior to joining the University of Missouri, ... Networks, Design and Analysis of Computer Systems, Wireless Communications and Computing, and Optical Networking He currently serves on the editorial boards of many national and international...

Ngày tải lên: 27/06/2014, 14:20

... and so on As mentioned earlier, an OFDM scheme can be considered as an economical implementation of a MC system One of the salient features of OFDM is its simplified base band implementation of ... Associate Professor of Electrical and Computer Engineering and the Director of Graduate Studies at the University of Missouri-Columbia from 1997 to 1999 Prior to joining the University of Missouri, ... Networks, Design and Analysis of Computer Systems, Wireless Communications and Computing, and Optical Networking He currently serves on the editorial boards of many national and international...

Ngày tải lên: 27/06/2014, 14:20

... August 4, 2000 in Partial Fulfillment of the Requirements for the Degrees of Master of Science in Aeronautics and Astronautics and Master of Science in Technology and Policy Abstract Air travel is ... 3.16 and 3.17 where the annual prices of each short- and long-range aircraft are averaged and plotted with year of introduction of each aircraft type Overall, aircraft price decreases with age of ... important findings of this thesis and draws conclusions relative to historical and future trends in aircraft performance, cost, and emissions All figures and tables are shown at the end of each chapter...

Ngày tải lên: 28/06/2014, 02:20

... CCF of element codes A0 and B0 , RA1 ,B1 (τ ) is the CCF of element codes A1 and B1 , RA2 ,B2 (τ ) is the CCF of element codes A2 and B2 , RA3 ,B3 (τ ) is the CCF of element codes A3 and B3 , and ... data transmission rate of T and the PG of PG = Tc The bandwidth of this QPSK DSSS system is determined by the chip width of c1 (t) and c2 (t) It is to be noted that the I and Q channels in the ... frequency band and is one of numerous first generation (1G) mobile cellular standards Even now, some parts of the United States and Canada are still under the coverage of the services of AMPS It...

Ngày tải lên: 09/08/2014, 19:22

... parts of the world and over 80 GSM networks are now operational It operates at 900- and 1800 MHz in many parts of Europe and in England Works at 1900 MHz in some parts of the United States TDMA -based ... data Release C of the CDMA2000 1xEV-DV standard supports a forward link of 3.08 Mbps and a reverse link of 153 kbps Release D supports a forward link of 3.08 Mbps and a reverse link of approximately ... Digital Cellular is a TDMA -based Japanese standard operating in the 80 0and 1500 MHz bands Personal Handy System A Japanese-centric system that offers high-speed data services and good voice clarity...

Ngày tải lên: 09/08/2014, 19:22

... same IP address and same PPP connection, therefore allowing a seamless handoff Handoffs from CDMA2000 1x to cdmaOne systems CDMA2000 supports the handoff of voice and data calls and other services ... that the handoffs could happen in the following different scenarios: (1) At a handoff boundary and within a single frequency band; (2) At a handoff boundary and between frequency bands (assuming ... UMTS standard, and we offer some explanations in this subsection Members of the 3GPP include organizations such as ETSI of Europe and ARIB of Japan, and so on, and individual members and market...

Ngày tải lên: 09/08/2014, 19:22

... neighboring cells 3.3.8 Baton Handover Baton Handover is another salient feature offered by the TD-SCDMA standard, which is used to take advantage of both hard handoff and SHO and is particularly suited ... MHz, a bandwidth of 26 MHz; (2) 2.4–2.4835 GHz, a bandwidth of 83.5 MHz, commonly called the 2.4-GHz band ; and (3) 5.725–5.850 GHz, a bandwidth of 125 MHz, commonly called the 5-GHz band Within ... Data rates, transmission types, and modulation schemes [479] Data rate (Mbps) 54 48 36 24 18 12 11 5.5 Transmission type OFDM OFDM OFDM OFDM OFDM OFDM DSSS OFDM OFDM DSSS DSSS DSSS Modulation...

Ngày tải lên: 09/08/2014, 19:22

... ships, planes, and land vehicles The service is now digital and packet based, using again a proprietary protocol, and with the introduction of the latest satellites will be capable of delivering ... subcarrier of OFDMA could be used to increase the number of traffic channels The author further illustrated that the scheme could take advantage of both the attributes of CDMA and OFDMA toward ... bandwidth efficiency of a CDMA system will be Obviously, we have the relation between the number 1 of relative offset chips n and SE as SE = n , or N ≤ SE ≤ Therefore, the use of n = relative offset...

Ngày tải lên: 09/08/2014, 19:22

... layer and link layer point of view OFDMA takes advantage of the granularity of OFDM in its control-layer design, enabling the MAC layer to perform efficient packet switching over the air and at ... 7.6.3, 7.6.4, and 7.6.5 Another UWB scheme that has gained much popularity is based on OFDM technology, namely, OFDM-UWB, which can be implemented on a multiband (MB) OFDM scheme The MB-OFDM UWB technology ... first and k-th users, and the last being the ACF of UWB pulse waveform Rp (γk Tc ) and Rp − (1 − γk ) Tc In fact, both partial cross-correlation function of the signature codes and ACF of the...

Ngày tải lên: 09/08/2014, 19:22

... (electrical wiring in homes and small of ces), and up to Gbps of new downstream bandwidth across existing cable television networks in addition to hundreds of megabits of new bandwidth per node upstream ... users, apart from the utilization of unlicensed bands such as the U-NII band or the ISM band, it is called a Licensed Band Cognitive Radio One of the Licensed Band Cognitive Radio-like systems ... largely on the basis of many functionalities of SDR.3 It is of imperative importance for us to understand how a software definable radio works in order to gain a better understanding of cognitive radio...

Ngày tải lên: 09/08/2014, 19:22

... OFDMA, FDD DL based on OFDMA • FDD UL/DL based on MC-WCDMA • TDD UL/DL based on MC-TD-SCDMA • TDD UL/DL based on OFDMA • TDD UL based on SC-FDMA, TDD DL based on OFDMA The evaluations of these technologies ... level of increase being dependent on the number of used subcarriers and/ or presence of out of band pilots for the support of frequency based scheduling However, several digital processing based ... minimize the complexity of the E-UTRA UE in terms of size, weight, and battery life (standby and active), which should be consistent with the provision of the advanced services of the E-UTRA/UTRAN...

Ngày tải lên: 09/08/2014, 19:22

... Wideband Systems and Technologies, May 2002 [667] I Maravic, M Vetterli, and K Ramchandran, Channel estimation and synchronization with sub-Nyquist sampling and application to ultra-wideband systems ... An analysis of the structure and camplexity of nonlinear binary sequence generators, IEEE Trans Inform Theory, vol IT-33, pp 124–129, 1987 [151] A H Chan and R A Games, On the quadratic spans of ... Optimization of the processing gain of an M-ary direct sequence spread spectrum communication system, IEEE Trans Commun., vol 28, p 1944, August 1980 [269] N Abramson, Bandwidth and spectra of phase- and...

Ngày tải lên: 09/08/2014, 19:22

... and so on As mentioned earlier, an OFDM scheme can be considered as an economical implementation of a MC system One of the salient features of OFDM is its simplified base band implementation of ... Associate Professor of Electrical and Computer Engineering and the Director of Graduate Studies at the University of Missouri-Columbia from 1997 to 1999 Prior to joining the University of Missouri, ... Networks, Design and Analysis of Computer Systems, Wireless Communications and Computing, and Optical Networking He currently serves on the editorial boards of many national and international...

Ngày tải lên: 14/08/2014, 12:21

... transactions, send and receive e-mail, play games, obtain weather reports and access the worldwide web The current cell-phone’s web- browsing capability offers access to a wide and growing array of websites ... experience and new classes of applications Note that terminal will be an essential part of the Ubiquitous Service Platform, where Open APIs and web protocols are 18 EVOLUTION OF MOBILE NETWORKS AND ... thinking of ways to use the wired, wireless, and mobile Internets together In December 2004, a tsunami swept hundreds of thousands of people – we may never really know how many – to their deaths, and...

Ngày tải lên: 20/01/2014, 06:20

... transactions, send and receive e-mail, play games, obtain weather reports and access the worldwide web The current cell-phone’s web- browsing capability offers access to a wide and growing array of websites ... provides higher bandwidth over the air interface and provides better handoff mechanisms, such as soft handover for circuit-switched bearer channels The CN primarily consists of a circuit-switched ... thinking of ways to use the wired, wireless, and mobile Internets together In December 2004, a tsunami swept hundreds of thousands of people – we may never really know how many – to their deaths, and...

Ngày tải lên: 27/06/2014, 14:20

... transactions, send and receive e-mail, play games, obtain weather reports and access the worldwide web The current cell-phone’s web- browsing capability offers access to a wide and growing array of websites ... free, and finds itself in a world of its own contriving, which it often does not understand The mobile telephone world was developed for commercial purposes, and is in many respects the son of its ... thinking of ways to use the wired, wireless, and mobile Internets together In December 2004, a tsunami swept hundreds of thousands of people – we may never really know how many – to their deaths, and...

Ngày tải lên: 14/08/2014, 09:21