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- 802.11n: MIMO really needs smart antennas
- As Wi-Fi standards go, 802.11n has a lot to live up to, especially after hearing how 802.11n's advertised throughput, security, and reliability will allow Wi-Fi to replace existing wired networks. This means 802.11n's RF technology needs to be rock-solid, just like Ethernet cables, while facing ever-changing environmental conditions. ...
- Tags: device, network, signal, ieee 802.11n, interference, mimo, technology, antenna, rf, ruckus wireless, antenna diversity, n, beamforming, beamflex, path control module, ruckus, wi-fi, wireless lans, wireless, michael kassner
- Blog posts 2008-05-14
- Optimal SIR-Based Power Control Strategies for Wireless CDMA Networks
- One aspect of the wireless communications power control problem that has received little attention is the designs of control algorithms that explicitly consider the tradeoff between the costs of transmit power and SIR error. This paper proposes a novel optimal control algorithm for distributed power control in cellular communication systems....
- Tags: strategy, algorithm, mobile, interference, ieee, engineering, advertising & promotion, wi-fi, wireless, marketing
- White papers 2007-03-28
- Interference and Metro-Scale Wi-Fi Mesh Networks
- Farpoint Group has been performing detailed studies of the effects of interference on Wi-Fi-based Wireless LANs WLANs for much of the past year. The focus has been on exploring the nature of interference from a variety of angles, and a variety of traffic types, including general traffic, streaming video over...
- Tags: farpoint group, interference, wlan, wireless lans, lans, wi-fi, wireless, networking
- White papers 2007-02-01
- Exploring the Effect of Inter-Flow Interference on TCP Performance in MANETs
- Research efforts in MANETs have concentrated on smoothing TCP incompatibilities with the IEEE 802.11 protocol due to the degrading effects of hidden terminals caused by transmission interference. Previous studies which have focused on solutions at the transport layer, have analysed the behaviour of single or isolated TCP flows and thus...
- Tags: interference, tcp, tcp/ip, networking
- White papers 2007-01-01
- 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
- 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
- Interference Aware Routing in Multi-Radio Wireless Mesh Networks
- This paper addresses the problem of interference aware routing in multi-radio infrastructure mesh networks wherein each mesh node is equipped with multiple radio interfaces and a subset of nodes serve as Internet gateways. The paper presents a new interference aware routing metric - iAWARE that aids in finding paths that...
- Tags: aware, interference, mesh networking, networking
- White papers 2006-09-25
- 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
- Interference-Aware Channel Assignment in Multi-Radio Wireless Mesh Networks
- The capacity problem in wireless mesh networks can be alleviated by equipping the mesh routers with multiple radios tuned to non-overlapping channels. However, channel assignment presents a challenge because co-located wireless networks are likely to be tuned to the same channels. The resulting increase in interference can adversely affect performance....
- Tags: aware, router, interference, mesh networking, routers & switches, networking, network technology, wi-fi, wireless
- White papers 2006-04-23
- 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
- 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
- DIAR: A Dynamic Interference Aware Routing Protocol for IEEE 802.11-Based Mobile Ad Hoc Networks
- A fundamental issue impacting the performance of mobile ad hoc networks is the wireless interference among neighboring nodes. This paper derives an interference aware metric NAVC based on the information collected from the IEEE 802.11 Medium Access Control MAC layer. The paper then proposes a novel Dynamic Interference Aware Routing...
- Tags: aware, ieee 802.11, mobile, george washington university, interference, routing protocol, wireless lans, wi-fi, wireless, advertising & promotion, marketing
- White papers 2005-09-17
- Minimizing Interference in Ad Hoc and Sensor Networks
- Reducing interference is one of the main challenges in wire-less communication, and particularly in ad hoc networks. The amount of interference experienced by a node v corresponds to the number of other nodes whose transmission range covers v. At the cost of communication links being dropped, interference can be reduced...
- Tags: advertisement, network, interference, sensor, networking
- White papers 2005-09-02
- Estimation of Link Interference in Static Multi-Hop Wireless Networks
- This paper presents a measurement-based study of interference among links in a static, IEEE 802.11, multi-hop wireless network. Interference is a key cause of performance degradation in such networks. To improve, or to even estimate the performance of these networks, one must have some knowledge of which links in the...
- Tags: network, interference, networking, wi-fi, wireless
- White papers 2005-08-10
- 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
- 802.11 Link Interference: A Simple Model and a Performance Enhancement
- Recent findings have revealed that the carrier-sensing range set in current major implementations does not detect all interference signals in 802.11 networks. This paper investigates the effects of interference and develops a mathematical model for it. The accuracy of the model is verified via simulations. Based on an insight from...
- Tags: ieee 802.11, performance, interference, model, wireless lans, wi-fi, wireless
- White papers 2005-04-28
- 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
- Propogate Networks, Inc: AutoCell - Evaluation of Impact on 802.11 Thoroughput
- It is a well-known fact that 802.11a/b/g end stations connected to wireless LANs achieve about half the stated bandwidth of the technology used. Often, the mix of access points APs in the WLAN can further erode throughput as overlapping RF footprints create radio interference. One way to mitigate the impact...
- Tags: ieee 802.11, interference, radio, wlan, wireless lans, lans, home networking, wi-fi, advertising & promotion, wireless, networking, personal technology, marketing
- White papers 2004-09-01
- Assigning Frequencies in GSM Networks
- Mobile communication is a key technology in today's information age. Despite the ongoing improvements in equipment design, interference remains a limiting factor for the use of radio communication. This paper investigates how to largely prevent interference in GSM networks by carefully assigning the available frequencies to the installed base stations....
- Tags: interference, mobile communication, gsm, cellular phones, advertising & promotion, consumer electronics, personal technology, marketing
- White papers
- Intercarrier and Intersymbol Interference Analysis of OFDM Systems on Time-Varying Channels
- In intersymbol interference ISI and intercarrier interference ICI for OFDM systems with insufficient guard length was analyzed in the case of time-invariant radio channels. This was carried out by truncating the channel impulse response CIR in mathematical analysis into two parts, the so-called truncated channels. The same technique is used...
- Tags: technique, channel, interference, analysis, ofdm, advertising & promotion, wireless, marketing
- White papers
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