using optimizing and testing functional techniques

... left blank Simpo PDF Merge and Split Unregistered Version - http://www.simpopdf.com Optimizing and Testing WLANs Proven Techniques for Maximum Performance By Tom Alexander AMSTERDAM • BOSTON • ... measurement, the equipment used, and some understanding of the techniques and complexities of each area Even design and development engineers, who usually not run into performance testing on a daily basis, ... Cataloging-in-Publication Data Alexander, Tom Testing 802.11 WLANs : techniques for maximum performance / By Tom Alexander p cm Includes bibliographical references and index ISBN 978-0-7506-7986-2...

Ngày tải lên: 27/06/2014, 00:20

... title word for each category using co-occurrence information Then centroid-contexts are extracted using the title word and keywords They contain at least one of the title and keywords Finally, we ... words, and words are similar to the extent that they appear in similar contexts (Karov and Edelman, 1998) This definition is circular Thus it is applied iteratively using two matrices, WSM and CSM ... contexts and the columns to the centroid-contexts In this paper, the number of input contexts of row and column in CSM is limited to 200, considering execution time and memory allocation, and the...

Ngày tải lên: 20/02/2014, 16:20

... Optimizing and Testing WLANs This page intentionally left blank Optimizing and Testing WLANs Proven Techniques for Maximum Performance By Tom Alexander AMSTERDAM • BOSTON ... Protocol Testing 109 5.2 Conformance and Functional Testing 111 5.3 Interoperability Testing 117 5.4 Performance Testing 121 5.5 Standardized Benchmark Testing ... measurement, the equipment used, and some understanding of the techniques and complexities of each area Even design and development engineers, who usually not run into performance testing on a daily basis,...

Ngày tải lên: 14/08/2014, 14:20

... Chapter Chip Design And Verification Chip Fabrication Chip Validation Testing Chip Manufacturing Testing QA Testing Device Prequalification Testing Environmental And Regulatory Testing System Design ... the RF and IF functions (up/down conversion, amplification, frequency synthesis and automatic gain control or AGC), the baseband functions (modulation and demodulation, and digitization), and the ... the 2.4 and 5.8 GHz frequency bands Thus they contain two completely independent RF/IF chains, basebands, and MAC processing elements Client NICs can rely on the presence of a host CPU and OS,...

Ngày tải lên: 14/08/2014, 14:20

... Protocol-Level Testing Once the RF characterization is complete, it becomes necessary to the same for the digital and software subsystem This type of testing is usually done using a clean and well-controlled ... protocol-level performance and functionality tests are done using a frame generator and a protocol analyzer, typically combined into a single unit (sometimes referred to as a traffic generator and analyzer ... (i.e., Layer is essentially assumed to be working and factored out), focusing on the Layer and higher protocol behavior Note also that WLAN benchmark testing is normally performed in the form of protocol...

Ngày tải lên: 14/08/2014, 14:20

... amplification, down-conversion and filtering, and baseband digital signal processing Sensitivity and dynamic range are obvious candidates; others include rejection of co-channel and adjacent channel interfering ... various reasons: • functional tests done during design and development of wireless LAN (WLAN) equipment and chips; • performance tests, which try to quantify how well the RF and baseband portions of ... must carry signal bandwidths in excess of 100 MHz A filter that can adequately suppress stray signals in the 2.4 GHz band while still presenting low insertion loss and passband ripple in the 0–100...

Ngày tải lên: 14/08/2014, 14:20

... transmitter peak output power to no more than W in the 2.4 and 5.8 GHz bands The 5.15 and 5.25 GHz bands have lower limitations on transmitter power (50 and 250 mW, respectively) For WLAN devices operating ... by IEEE 802.11 generate very wideband signals between 16 and 20 MHz in terms of Ϫ3 dB bandwidth To ensure that they minimize or limit cross-channel and out-of-band interference, IEEE 802.11 transmitters ... quite small and difficult to probe, and the probes used are delicate and expensive (and have to be used under a microscope) For these reasons, RF design engineers spend a great deal of time and money...

Ngày tải lên: 14/08/2014, 14:20

... buffer capacity QoS capacity 5.5 Standardized Benchmark Testing There is probably no area of protocol testing that rouses as much interest – and controversy! – as standardized benchmark measurements ... • forwarding rate and packet loss, • latency, • scalability in terms of number of clients and APs, 134 Protocol Testing • roaming measurements, • QoS measurements Functional and conformance tests ... track thousands of tags, each representing a “client”; however, testing the system by actually using such tags (and then moving them about from place to place) is clearly very expensive and not...

Ngày tải lên: 14/08/2014, 14:20

... finished and packaged products off the inventory shelves at random and perform more extensive testing Such random sampling helps to identify manufacturing issues and deficiencies in the production testing ... those that use “real phones” (i.e., actual handsets), and those that attempt to simulate the handsets using traffic generators Both have their advantages and disadvantages The figure below shows a ... real handsets as sources and sinks of traffic In such a scenario, the entire infrastructure to be tested is set up (and acts as a SUT, as denoted by the dotted lines), and then some number of handsets...

Ngày tải lên: 14/08/2014, 14:20

... loaded, the chipset and therefore the system is non -functional 7.5 Functional and System Testing Functional and system tests are performed after the WLAN device has been fully aligned and programmed, ... determine the various gain and I/Q balance constants Align the receiver and determine the RSSI and AGC constants Determine LNA and diversity switching constants Calculate and program calibration ... vendors and manufacturers; this is standardized as LXI (LAN Extensions for Instrumentation), and allows bulky GPIB cables and unwieldy serial console multiplexers to be replaced by a simple and high-speed...

Ngày tải lên: 14/08/2014, 14:20

... of the APs and WLAN controllers, and are installed and operated as a separate subsystem The sensors can pick up and track all the WLAN signals in their surrounding area; sampling techniques allow ... transmitter and receiver, and is therefore the enemy of conventional digital modulation techniques 208 Testing MIMO Systems MIMO turns this entire problem on its head Rather than treating scattering and ... because the operating frequency ranges and channel bandwidths in the WLAN bands are defined by regulatory bodies and would hence be more-or-less the same as for standard 802.11a/g PHYs, but 5–10 times...

Ngày tải lên: 14/08/2014, 14:20

... necessary 240 APPENDIX A A Standards Guide This Appendix provides a general guide to the regulatory and standards documents that govern WLAN equipment design and testing A.1 FCC Part 15 The Federal ... (MAC) and Physical Layer (PHY) specifications” The 802.11 standard contains a large and often confusing array of specifications, options, formal state diagrams, etc., with 19 subclauses and 16 ... the GHz band including the spectral masks and operating channels 242 A Standards Guide The upcoming IEEE 802.11n amendment, currently in revision and still being balloted by the IEEE standards...

Ngày tải lên: 14/08/2014, 14:20

... randomly selected from section 23 of the WSJ treebank, using both LFG and DR measures Table 1: Disambiguation results for 700 randomly selected examples from section 23 of the WSJ treebank using ... 80.3%/81% when going from training and testing on the WSJ to training on the WSJ and testing on the Brown corpus Table 2: LFG F-scores for the 700 WSJ test examples and DR F-scores for the 500 Brown ... was selected manually 4.2 Testing Two different sets of test data were used: (i) 700 sentences randomly extracted from section 23 of the WSJ treebank and given gold-standard f-structure annotations...

Ngày tải lên: 23/03/2014, 20:20

... advantages of pair work and group work techniques in teaching and learning English and it can help other teachers of English be aware of these advantages and apply pair work and group work activities ... participation, cooperation, negotiation and so on As a result, I decided to a research entitled using pair work and group work techniques to increase students’ participation and interest in communicative ... English classes at HaUI? Does using pair work and group work techniques increase students’ interest in communicative English classes at HaUI? Does using pair work and group work increase students’...

Ngày tải lên: 06/02/2014, 14:45

... discuss conclusions and future work in section Extracting Candidates Comparative-sentence In this section, we define comparative keywords and extract comparative-sentence candidates by using those keywords ... tences from the Candidates Sen- To effectively eliminate non-comparative sentences from comparative sentence candidates with a CKL2 keyword, we employ machine learning techniques (MEM and Naïve Bayes) ... 22(1):39-71 Andrea Esuli and Fabrizio Sebastiani 2006 Determining Term Subjectivity and Term Orientation for Opinion Mining European Chapter of the Association for Computational Linguistics, 193-200 Andrew...

Ngày tải lên: 20/02/2014, 09:20

... both a corporate and an Internet firewall, and by a proxy solution such as Microsoft Internet Security and Acceleration (ISA) server Network management and network analysis using Microsoft Network ... procedures, defining security solutions, designing and executing deployments, and monitoring and troubleshooting database servers We assume that before you begin using this kit you will have a good working ... databases and their design, Transact-SQL, and the Microsoft SQL Server 2005 client tools By using this training kit, you’ll learn how to the following: ■ Optimize the performance of database servers and...

Ngày tải lên: 28/03/2014, 19:20

... a number of quantized random projections of the original image; the content user (CU) computes its own random projections on the received (and possibly tampered) image, and uses them as a side ... Journal on Image and Video Processing of random projections of pixels, the authors compute for each signal frame a weighted spectral flatness measure, with randomly chosen weights, and encode this ... e = Ψα X X Untrusted network Frame-based subband log-energy extraction x Frame-based subband log-energy extraction Random seed S b = AΨ1 α + z1 Random projections y = Ax y y H (X, S) b = AΨ2...

Ngày tải lên: 22/06/2014, 00:20

... as: Huang et al., Four-dimensional dosimetry validation and study in lung radiotherapy using deformable image registration and Monte Carlo techniques Radiation Oncology 2010, 5:45 ... other phases of CT scans and the doses were calculated using Monte Carlo methods (vide infra) The 4D cumulative doses were generated Table lists the tumor sizes, motion ranges and beam margins for ... ICRUTISSUE and ICRPBONE were used for air, lung tissue, soft tissue and bone media respectively based on their CT number ranges, while for the phantom cases (Case & 4), AIR, LUNG and PMMA were...

Ngày tải lên: 09/08/2014, 08:23

... contrasting and substituting techniques to teach The teacher follows the steps in the textbook Ship or Sheep and uses some techniques derived from the book such as listening and imitating, using drills, ... as /s/, /z/, /t/, /v/, confusing /ð/ for /d/ or /z/, confusing /ʃ/ for /s/, confusing /θ/ for /t/ or /s/ or the Vietnamese /t’/, confusing /ʤ/ for /z/ or /ʒ/, confusing /j/ for /ʒ/ 66% of the ... with the contrasting and substituting techniques can learn better 39 Concluding remarks The study focuses on testing the effectiveness of the contrasting and substituting techniques used in teaching...

Ngày tải lên: 05/11/2015, 20:52

Ngày tải lên: 17/09/2012, 09:13