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- Orthogonal Frequency Division Multiplexing for Wireless Communications
- Orthogonal frequency division multiplexing OFDM is a promising technique for high-data-rate wireless communications because it can combat inter-symbol interference ISI caused by the dispersive fading of wireless channels. The proposed research focuses on techniques that improve the performance of OFDM based wireless communications and its commercial and military applications. In...
- Tags: Wireless Communication, OFDM, Wi-Fi, Wireless
- White papers 2004-11-16
- Robust Adaptive Beamforming Algorithm Using Instantaneous Direction of Arrival With Enhanced Noise Suppression Capability
- This paper proposes a novel adaptive beamforming algorithm with enhanced noise suppression capability. The proposed algorithm incorporates the sound-source presence probability into the adaptive blocking matrix, which is estimated based on the instantaneous direction of arrival of the input signals and voice activity detection. The proposed algorithm guarantees robustness to...
- Tags: Algorithm, Engineering
- White papers 2006-09-29
- Techniques for Suppression of Intercarrier Interference in OFDM Systems
- This paper considers an orthogonal frequency division multiplexing OFDM system over frequency selective time-varying fading channels. The time variations of the channel during one OFDM frame destroy the orthogonality of different subcarriers and results in power leakage among the subcarriers, known as Intercarrier Interference ICI, which results in a degradation...
- Tags: Technique, OFDM, Wireless
- White papers 2005-04-27
- Fire Suppression System
- We're moving into a new building at the end of the year. I'd like to find out what our options are when it comes to fire suppression systems. Is Halon still the system to get, or are there other technologies that are preferable today?Fire suppression alternativesA few things you will...
- Tags: Halon
- Discussion threads 2006-06-02
- Modeling and Simulation of IEEE 802.11 Wireless-LAN and Bluetooth Piconet Range Interference
- The proximity of wireless devices with one another often results in interference in the unlicensed 2.4 GHz ISM bandwidth. Interference has been recognized as a major problem to wireless network performance and improvement. This paper reports a proposed and investigated Interference Range Model IRM, a model that allows a user...
- Tags: IEEE 802.11, Interference, Modeling, Wi-Fi, Performance Management, Research & Development, Wireless, Wireless LANs, Bluetooth, Human Resources, Workforce Management, Business Operations
- White papers 2004-09-20
- RF Interference in Home Networks
- Interference can lead to performance reduction of wireless devices. This paper points out the different types of interference on a Bluetooth device and introduces a possible solution to prevent interference. The new solution is a software implementation which requires no hardware adjustments. After simulation some points of improvements are found...
- Tags: Solution, Network, Home Network, Interference, Performance Management, Wi-Fi, Wireless, Human Resources, Workforce Management
- White papers 2005-06-01
- Evaluating Interference in Wireless LANs: Recommend Practice
- Radio interference remains a core concern among Wireless LAN WLAN users, network administrators, and operations staff alike. After all, the potential for interference is a fact of life in the unlicensed bands where WLANs operate, and, even worse, it is often very difficult to evaluate the effects of interference on...
- Tags: Interference, WLAN, Wireless LANs, LANs, Wi-Fi, Wireless, Networking
- White papers 2006-09-01
- Digital GEM Professional Plug-in (exe)
- Digital GEM Professional Plug-in adds new features and functionality to the award-winning Digital GEM Plug-in to give users more control and better results for reducing distracting noise and grain in their 8-bit or 16-bit digital images. The Digital GEM Professional Plug-in provides two unique and powerful algorithms: Noise suppression; and...
- Tags: Algorithm, Plug-in, Digital GEM Professional Plug-in, Noise Suppression Algorithm, Grain Suppression Algorithm, Engineering
- Software downloads 2004-11-15
- RF interference: Just how important are antennas
- Being able to co-locate multiple RF systems within millimeters of each other in modern wireless devices is in large part due to reducing RF interference. Many of these "interference-busting" innovations are the result of engineers making improvements to antenna systems. by Michael Kassner
- Tags: Radio Frequency, Radio, Antenna, Radio Frequency Isolation, Ruckus Wireless, Q, Equipment Developer, Advertising & Promotion, Network Technology, Marketing, Networking, Michael Kassner
- Blog posts 2008-06-15
- On the Design of Robust Multiband OFDM Ultra-Wideband Receivers
- This paper analyzes the effects of NarrowBand Interferences NBI on the performance of a Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM) Ultra-WideBand UWB receiver and proposes efficient schemes for signal reception and extraction of information in the presence of NBI. A study to assess the effects of NBI on the quantization...
- Tags: UWB, Texas A&M University, NBI, Ultrawideband (UWB), Wireless
- White papers 2005-10-14
- Crystal Report Suppression
- I currently have a report & a sub-report in Crystal 8.5 that is pulling values. Does anyone know how to supress the detail on the main report if the subreport values are null?Should be in Format, Section.Click on your subreport in the left pane.Select suppression options in the right...
- Tags: davegenovese@...
- Q&A 2005-03-03
- i want to know some latest topics related to electrical engg. for thesis
- hello sir,please send me some topics related to the field of electrical engg. for thesis.i shall be very thankful to u.thanking u.regards.-simar.SuggestionsHow about internet over power lines and their interference products. To go along with that is filtering these signals out and surge suppression.Join the IEEEand you can browse...
- Tags: simar_sidhu2001@...
- Discussion threads 2007-06-26
- Suppression Rule for Speech Recognition Friendly Noise Suppressors
- Audio signal enhancement often involves the application of a time-varying filter, or suppression rule, to the frequency-domain transform of a corrupted signal. Known approaches use rules derived under Gaussian models and interpret them as spectral estimators in a Bayesian statistical framework. While this mathematical approach provides rules that satisfy certain...
- Tags: Speech Recognition, Emerging Technologies
- White papers 2005-12-30
- Microphone Array for Headset With Spatial Noise Suppressor
- This paper presents a hybrid microphone array architecture used for processing the signals from a small microphone array that is used in a headset. The processing chain consists of fixed end-fire beamforming, adaptive spatial noise reduction and stationary noise suppression. The far-field design algorithm used for the fixed beamformer is...
- Tags: Microphone, Headset, Noise Reduction
- White papers 2005-06-30
- The Invisible Threat: Interference and Wireless LANs
- Interference is a fact of life in the unlicensed bands used by Wireless LANs WLANs, and is an increasing challenge in all WLAN environments - the enterprise, outdoors (including metro-scale Wi-Fi meshes), and in the residence. As the number of unlicensed devices grows and as ever more mission-critical applications are...
- Tags: Interference, WLAN, Wireless LANs, LANs, Wi-Fi, Wireless, Networking
- White papers 2006-10-01
- Performance Analysis of Bluetooth Piconets Under Mutual Interference Using Bit Error Rate
- In this paper, the performance of the Bluetooth piconets under the mutual interference is analyzed. As a performance measure, the packet error probability PEP is used. The PEP is obtained from the bit error rate BER and the collision length of packet. Not only the hit probability but also the...
- Tags: Performance, Interference, Analysis, Packet Error Probability, Bluetooth, Performance Management, Wi-Fi, Wireless, Human Resources, Workforce Management
- White papers 2005-09-20
- Efficient Interference-Aware TDMA Link Scheduling for Static Wireless Networks
- This paper studies efficient link scheduling for a multihop wireless network to maximize its throughput. Efficient link scheduling can greatly reduce the interference effect of close-by transmissions. Unlike the previous studies that often assume a unit disk graph model, the paper assumes that different terminals could have different transmission ranges...
- Tags: Aware, Network, TDMA, Interference, Association For Computing Machinery, Wireless Network, Cellular Phones, Wi-Fi, Wireless, Networking, Consumer Electronics, Personal Technology
- White papers 2006-09-26
- Topology Control With Better Radio Models: Implications for Energy and Multi-Hop Interference
- Topology Control TC is a well-studied technique used in wireless ad hoc networks to find energy-efficient and/or low-interference subgraphs of the maxpower communication graph. However, existing work has the following limitations: the energy model adopted is quite unrealistic - only transmit power is often considered and homogeneous decay of the...
- Tags: Interference, Radio, Association For Computing Machinery, Energy, Topology Control, Advertising & Promotion, Productivity, Marketing
- White papers 2005-10-13
- Capacity Gains of Single Antenna Interference Cancellation in GSM
- Single Antenna Interference Cancellation SAIC is a very interesting and promising technology currently being standardized in 3GPP as part of GERAN Release 6. This interference reduction technique takes advantage of the latest developments in signal processing and receiver algorithms in a cost-efficient way. In most advantageous interference conditions, SAIC can...
- Tags: Algorithm, Nokia Corp., Network, GSM, Single Antenna Interference Cancellation, Engineering, Cellular Phones, Networking, Consumer Electronics, Personal Technology
- White papers 2004-05-27
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