Results 1 - 10 of 486

Opportunistic Media Access for Multirate Ad Hoc Networks

by B. Sadeghi, V. Kanodia, A. Sabharwal, E. Knightly , 2002
"... The IEEE 802.11 wireless media access standard supports multiple data rates at the physical layer. Moreover, various auto rate adaptation mechanisms at the medium access layer have been proposed to utilize this multi-rate capability by automatically adapting the transmission rate to best match the c ..."
Abstract - Cited by 332 (12 self) - Add to MetaCart
for the same time-shares as achieved by single-rate IEEE 802.11. We describe mechanisms to implement OAR on top of any existing auto-rate adaptation scheme in a nearly IEEE 802.11 compliant manner. We also analytically study OAR and characterize the gains in throughput as a function of the channel conditions

High-performance MAC for high-capacity wireless LANs

by Yuan Yuan, Daqing Gu, William Arbaugh, Jinyun Zhang - In Proc. IEEE ICCCN , 2004
"... Abstract — The next-generation wireless technologies, e.g., 802.11n and 802.15.3a, offer a physical-layer speed at least anorder-of-magnitude higher than the current standards. However, direct application of current MACs leads to high protocol overhead and significant throughput degradation. In this ..."
Abstract - Cited by 9 (1 self) - Add to MetaCart
temporal fair share of the channel similar to the single-rate IEEE 802.11, and low-rate hosts proportional temporal fairness in long term. Simulations show that the ADCA design increases the throughput by 112 % and reduces average delay by 54 % compared with the legacy DCF. It delivers more than 100Mbps

OAR: An Opportunistic Auto-rate Media Access

by B. Sadeghi, V. Kanodia, A. Sabharwal, E. Knightly - ACM Mobicom , 2005
"... The IEEE 802.11 wireless media access standard supports multiple data rates at the physical layer. Moreover, various auto rate adaptation mechanisms at the medium access layer have been proposed to utilize this multi-rate capability by automatically adapting the transmission rate to best match the c ..."
Abstract - Cited by 40 (1 self) - Add to MetaCart
for the same time-shares as achieved by single-rate IEEE 802.11. We describe mechanisms to implement OAR on top of any existing auto-rate adaptation scheme in a nearly IEEE 802.11 compliant manner. We also analytically study OAR and characterize the delay jitter and the gains in throughput as a function

Wireless LANs

by Yuan Yuan, Daqing Gu, William Arbaugh, Jinyun Zhang, Yuan Yuan, Daqing Gu, William Arbaugh, Jinyun Zhang , 2004
"... The next-generation wireless technologies, e.g., 802.11n and 802.15.3a, offer a physical-layer speed at least an-order-of-magniture higher than the current standards. However, direct application of current MACs leads to high protocol overhead and significant throughput degradation. In this paper, we ..."
Abstract - Add to MetaCart
fair share of the channel similar to the single-rate IEEE 802.11, and low-rate hosts proportional temporal fairness in long term. Simulations show that the ADCA design increases the throughput by 112 % and reduces average delay by 54 % compared with the legacy DCF. It delivers more than 100 Mbps MAC

Goodput Analysis and Link Adaptation for IEEE 802.11a Wireless LANs

by Daji Qiao, Student Member, Sunghyun Choi, Kang G. Shin - IEEE Trans. on Mobile Computing , 2002
"... Abstract—Link adaptation to dynamically select the data transmission rate at a given time has been recognized as an effective way to improve the goodput performance of the IEEE 802.11 wireless local-area networks (WLANs). Recently, with the introduction of the new high-speed 802.11a physical layer ( ..."
Abstract - Cited by 145 (11 self) - Add to MetaCart
Abstract—Link adaptation to dynamically select the data transmission rate at a given time has been recognized as an effective way to improve the goodput performance of the IEEE 802.11 wireless local-area networks (WLANs). Recently, with the introduction of the new high-speed 802.11a physical layer

ABSTRACT Opportunistic Media Access for Multirate

by B. Sadeghi, V. Kanodia, A. Sabharwal, E. Knightly
"... The IEEE 802.11 wireless media access standard supports multiple data rates at the physical layer. Moreover, various auto rate adaptation mechanisms at the medium access layer have been proposed to utilize this multi-rate capability by automatically adapting the transmission rate to best match the c ..."
Abstract - Add to MetaCart
for the same time-shares as achieved by single-rate IEEE 802.11. We describe mechanisms to implement OAR on top of any existing auto-rate adaptation scheme in a nearly IEEE 802.11 compliant manner. We also analytically study OAR and characterize the gains in throughput as a function of the channel conditions

MiSer: An Optimal Low-Energy Transmission Strategy for IEEE 802.11 a/h.

by Daji Qiao , Sunghyun Choi , Amit Jain , + Kang , G Shin , 2003
"... Abstract Reducing the energy consumption by wireless communication devices is perhaps the most important issue in the widely-deployed and exponentially-growing IEEE 802.11 Wireless LANs (WLANs). TPC (Transmit Power Control) and PHY (physical layer) rate adaptation have been recognized as two most e ..."
Abstract - Cited by 99 (5 self) - Add to MetaCart
. Our simulation results show that MiSer delivers about 20% more data per unit of energy consumption than the PHY rate adaptation scheme without TPC, while outperforming single-rate TPC schemes significantly thanks to the excellent energy-saving capability of PHY rate adaptation.

Idle sense: An optimal access method for high throughput and fairness in rate diverse wireless LANs

by Martin Heusse, Franck Rousseau, Romaric Guillier, Andrzej Duda - In ACM SIGCOMM , 2005
"... We consider wireless LANs such as IEEE 802.11 operating in the unlicensed radio spectrum. While their nominal bit rates have increased considerably, the MAC layer remains practically unchanged despite much research effort spent on improving its performance. We observe that most proposals for tuning ..."
Abstract - Cited by 175 (12 self) - Add to MetaCart
We consider wireless LANs such as IEEE 802.11 operating in the unlicensed radio spectrum. While their nominal bit rates have increased considerably, the MAC layer remains practically unchanged despite much research effort spent on improving its performance. We observe that most proposals for tuning

To appear in the proceedings of the IEEE workshop on

by unknown authors
"... Face recognition has recently attracted increasing attention and is beginning to be applied in a variety of domains, predominantly for security, but also for video indexing. This paper describes the application of a face recognition system to video indexing, with the joint purpose of labelling faces ..."
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are presented showing a significant improvement in recognition rates when the whole sequence is used instead of a single image of the face. 1

State Dependent Attempt Rate Modeling of Single Cell IEEE 802.11 WLANs with Homogeneous Nodes and Poisson Arrivals

by Manoj K. P, Anurag Kumar
"... Abstract—Analytical models of IEEE 802.11-based WLANs are invariably based on approximations, such as the well-known mean-field approximations proposed by Bianchi for saturated nodes. In this paper, we provide a new approach for modeling the situation when the nodes are not saturated. We study a Sta ..."
Abstract - Cited by 4 (1 self) - Add to MetaCart
State Dependent Attempt Rate (SDAR) approximation to model queues (one queue per node) served by the CSMA/CA protocol as standardized in the IEEE 802.11 DCF. The approximation is that, when of the queues are non-empty, the attempt probability of the non-empty nodes is given by the long-term attempt
Results 1 - 10 of 486