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- About the 10 Gigabit Ethernet Standard
- 10 GbE Physical layer specifications PHY and supported media and reaches, as defined in IEEE 802.3 2005. In Ethernet standards, the different optical and copper media are known as types of physical media-dependent interfaces PMDs. The 10 GbE MAC operates at 10 Gbps at its service interface towards PHY...
- Tags: Force10 Networks Inc., 10-Gigabit Ethernet, MAC, Media, Rate Adaptation Mechanism, Ethernet, Network Technology, Advertising & Promotion, Networking, Marketing
- White papers 2007-07-01
Additional Resources
- Delay-Constrained Rate Adaptation for Robust Video Transmission Over Home Networks
- This paper considers rate adaptation for robust transmission of high-quality video over home networks, in particular IEEE 802.11 wireless LANs. The approach includes on-line estimation of the time-varying bandwidth available at the application-/transport-layer. The paper proposes a delay-constrained rate adaptation algorithm to select an optimal bit rate, subsequently enforced by...
- Tags: Georgia Institute Of Technology, Network, Home Network, Adaptation, Video, Corporate Communications, Marketing
- White papers 2005-05-11
- Scalability Analysis of Rate Adaptation Techniques in Congested IEEE 802.11 Networks: An ORBIT Testbed Comparative Study
- Recent real-world measurements in dense congested radio environments have pointed out the inefficiency of frame error-based bit-rate adaptation mechanisms, which significantly reduce network capacity by misinterpreting frame errors due to collisions. These effects are likely to be amplified with the heavy use of media applications. Fortunately, traditional SNR-based rate adaptation,...
- Tags: Technique, IEEE 802.11, New Jersey, Environment, Scalability, Collision, Adaptation, Wireless LANs, Performance Management, Wi-Fi, Wireless, Human Resources, Workforce Management
- White papers 2007-04-26
- IEEE 802.11 Rate Adaptation: A Practical Approach
- Today, three different PHYsical PHY layers for the IEEE 802.11 WLAN are available (802.11a/b/g); they all provide multi-rate capabilities. To achieve a high performance under varying conditions, these devices need to adapt their transmission rate dynamically. While this rate adaptation algorithm is a critical component of their performance, only very...
- Tags: Algorithm, IEEE 802.11, Association For Computing Machinery, Wireless LANs, Engineering, Wi-Fi, Wireless
- White papers 2004-10-04
- Experimental Evaluation of Application Performance With 802.11 PHY Rate Adaptation Mechanisms in Diverse Environments
- This paper examines the impact of physical layer rate adaptation mechanisms on the performance of real applications over 802.11 wireless links in diverse channel environments. The evaluations are based on a testbed with real wireless devices equipped with commodity 802.11 hardware and a hardware channel emulator. The paper considers two...
- Tags: IEEE 802.11, Performance, Environment, Hardware, Adaptation Mechanism, Wireless LANs, Wi-Fi, Wireless, Performance Management, Human Resources, Workforce Management
- White papers 2006-08-18
- Fast-Responsive Link Adaptation for IEEE 802.11 WLANs
- This paper proposes a truly-adaptive fast-responsive link adaptation scheme for IEEE 802.11 WLANs Wireless LANs. The key idea is to direct the transmitter station's rate-increasing attempts in a controlled manner such that the responsiveness of the link adaptation scheme can be guaranteed with minimum number of rate-increasing attempts. Since the...
- Tags: IEEE 802.11, Transmitter, Adaptation, Idea, Wireless LANs, Wi-Fi, Wireless
- White papers 2005-09-15
- The Impact of IEEE 802.11 MAC Strategies on Multi-Hop Wireless Mesh Networks
- This paper analyzes the impact of different MAC Medium Access Control and transmission rate adaptation schemes on wireless mesh networks. The considered protocols include three different MAC protocols specified in IEEE 802.11 standards, i.e., 802.11, 802.11e, and 802.11n, and three rate adaptation schemes, i.e., ARF Automatic Rate Fallback, RBAR (Receiver-Based...
- Tags: IEEE 802.11, Hewlett-Packard Co., MAC, Wireless LANs, Wi-Fi, Wireless
- White papers 2006-10-18
- Distributed Cooperative Rate Adaptation for Energy Efficiency in IEEE 802.11-Based Multi-Hop Networks
- This paper studies the problem of using the rate adaptation technique to achieve energy efficiency in an IEEE 802.11-based multi-hop network. Specifically, it is formulated as an optimization problem, i.e., minimizing the total transmission power over transmission data rates, subject to the traffic requirements of all the nodes in a...
- Tags: IEEE 802.11, Problem, Adaptation, Wireless LANs, Productivity, Wi-Fi, Wireless
- White papers 2005-11-12
- Quality-of-Service Driven Power and Rate Adaptation for Multichannel Communications Over Wireless Links
- This paper proposes a Quality-of-Service QoS driven power and rate adaptation scheme for multichannel communications systems over wireless links. In particular, the paper uses multichannel communications to model the conceptual architectures for either diversity or multiplexing systems, which play a fundamental role in physical-layer evolutions of mobile wireless networks. By...
- Tags: QoS, Adaptation, IEEE, Wi-Fi, Wireless
- White papers 2006-07-10
- TCP-Aware Resource Allocation in CDMA Networks
- TCP is the dominant transport protocol over both wired and wireless links. It is however, well known that TCP is not suitable for wireless networks and several solutions have been proposed to rectify this shortcoming. The work discusses in this paper explores cross-layer optimization of the rate adaptation feature of...
- Tags: Aware, CDMA, TCP, Allocation, Tcp/Ip, Wi-Fi, Networking, Wireless
- White papers 2006-09-26
- Quality-of-Service Driven Power and Rate Adaptation Over Wireless Links
- This paper proposes a Quality-of-Service QoS driven power and rate adaptation scheme over wireless links in mobile wireless networks. Specifically, the proposed scheme aims at maximizing the system throughput subject to a given delay QoS constraint. First, the paper derives an optimal adaptation policy by integrating information theory with the...
- Tags: QoS, Wireless
- White papers 2006-06-28
- Performance Enhancement of Adaptive Orthogonal Modulation in Wireless CDMA Systems
- Recent research in wireless CDMA systems has shown that adaptive rate/power control can considerably increase network throughput relative to systems that use only power or rate control. This paper considers joint power/rate optimization in the context of Orthogonal Modulation OM and investigates the additional performance gains achieved through adaptation of...
- Tags: University Of Arizona, Performance, Network, Adaptation, Wireless, Performance Management, Networking, Human Resources, Workforce Management
- White papers 2005-05-09
- Impact of Upper Layer Adaptation on End-to-End Delay Management in Wireless Ad Hoc Networks
- A good amount of research has been developed to support QoS issues in IEEE 802.11 ad hoc networks, such as QoS routing, MAC layer QoS support, and cross-layer QoS design. However, QoS solution at upper layers for real-time multimedia applications is overlooked. This paper investigates impact of the adaptation mechanisms...
- Tags: QoS, Middleware, Wireless, Layer Adaptation, Middleware Adaptor
- White papers 2006-02-03
- Improving the Performance of TCP Wireless Video Streaming With a Novel Playback Adaptation Algorithm
- This paper proposes a playback adaptation algorithm for video streaming with TCP in wireless networks where both handoffs and random wireless errors are possible. Primary task of the algorithm is the estimation of the expected latency for the delivery of the lost packets by TCP. After this procedure is performed,...
- Tags: Algorithm, Performance, TCP, Tcp/Ip, Engineering, Networking
- White papers 2006-12-14
- Adaptive Multilevel Coding in OFDM Systems
- A link adaptation method for OFDM systems based on multilevel coding is presented. A set of multilevel codes to be used for link adaptation is constructed based on capacity-approaching LDPC codes. The performance of the suggested system is analyzed. Orthogonal Frequency Division Multiplexing OFDM is considered the leading candidate for...
- Tags: Siemens AG, OFDM, Wireless
- White papers 2005-01-27
- Delay Aware Adaptive Scheduling in Wireless LAN
- In this paper, an adaptive opportunistic scheduling scheme is proposed for wireless LANs in the presence of a link adaptation scheme such as Auto-Rate Fall-back ARF. Extensive simulation experiments and scenarios have shown that this scheme outperforms other alternatives in terms of throughput as well as adaptation to different channel...
- Tags: Aware, WLAN, Adaptation, LANs, Wireless LANs, Wi-Fi, Wireless, Network Technology, Networking
- White papers 2005-08-29
- Information Survivability for Mobile Wireless Systems
- Mobile wireless networks are more vulnerable to cyber attack and more difficult to defend than conventional wired networks. In discussing security and survivability issues in mobile wireless networks, the paper focus here on group communication, as applied to multimedia conferencing. The need to conserve resources in wireless networks encourages the...
- Tags: Mobile, Network, Security, Wireless
- White papers 2005-07-07
- Performance Comparison of Source Controlled GSM AMR and SMV Vocoders
- The Adaptive Multi-Rate AMR speech codec offers substantial improvement over previous GSM speech codecs in error robustness by adapting speech and channel coding depending on channel conditions. In GSM AMR, the trade-off between speech quality and average bit rate can be further improved by source signal based rate adaptation SBRA....
- Tags: Performance, Codec, GSM, Speech Codec, Cellular Phones, Consumer Electronics, Personal Technology
- White papers 2004-10-21
- Multimode Precoding for MIMO Wireless Systems
- Multiple-Input Multiple-Output MIMO wireless systems obtain large diversity and capacity gains by employing multielement antenna arrays at both the transmitter and receiver. The theoretical performance benefits of MIMO systems, however, are irrelevant unless low error rate, spectrally efficient signaling techniques are found. This paper proposes a new method for designing...
- Tags: Transmitter, MIMO, Idea
- White papers 2005-10-01
- Modeling TCP Throughput Over Wired/Wireless Heterogeneous Networks for Receiver-Based ACK Splitting Mechanism
- Recently, heterogeneous networks with wired and wireless links are becoming common. However, the performance of TCP data transmission deteriorates significantly over such networks because of packet losses caused by the high bit error rate of wireless links. The paper had proposed receiver-based ACK splitting mechanism to solve that problem previously....
- Tags: Modeling, Wireless Link, Tcp/Ip, Wi-Fi, Wireless, Networking
- White papers 2006-04-22
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