IEEE 802.11-based devices employ rate adaptation algorithms to dynamically switch data rates to accommodate the fluctuating wireless channel conditions. Many studies observed that, when there are other stations transmitting in the network, existing rate adaptation performance degrades significantly due to the inability of differentiating losses between wireless noise and contention collisions. ...

A new approach for speaker adaptation consisting of MLLR adaptation enriched by a special weighting scheme followed by MAP adaptation is presented. While the standard MLLR approach increases the error rate for the considered small amounts of adaptation data in on-line, unsupervised adaptation, our approach can reduce the error by up to 30%. This result can further be improved by switching to MA...

81  Abstract— In this paper, closed-form expressions for capacities per unit bandwidth for spatially correlated multiuser MIMO-OFDM systems employing Orthogonal Space-Frequency Block Coding (OSFBC) over multipath frequency-selective fading channels are derived for optimal power and rate adaptation, optimal rate adaptation with constant transmit power, channel inversion with fixed rate, and tru...

We investigate dynamic adaptation policies for rate adaptive multimedia streams in a network where each route traverses at most one bottleneck link. Dynamic adaptation allows clients to dynamically adapt the stream subscription level, i.e., time-average stream rate, in response to changes in available link capacity, and allows the system to maintain a lower blocking probability than is possible...

Link quality based rate adaptation which aims at link throughput optimization has been used widely for IEEE 802.11 networks. However, from system perspective network performance is affected by not only link quality but also random channel access at the MAC layer. Selection of transmit mode for optimal link throughput can cause performance loss of MAC throughput. In this paper we investigate thi...

We consider combined rate and power adaptations in direct-sequence code-division multiple-access communications, where the transmission power and the data rate are adapted relative to channel variations. We discuss the power gain that the combined adaptations provide over power adaptation. Then, we consider an integrated voice and data transmission system that offers a constant bit rate voice s...

Background: The Ural region is highlighted among other Russian regions for its unfavorable radiation situation and complexity of the overall environmental situation. The source of man-made radioactive contamination is the work of the "Mayak" Production Association. A significant radioactive contamination has happened as a result of several radiation incidents in the early period ...

Auditory adaptation to sound-level statistics occurs as early as in the auditory nerve (AN), the first stage of neural auditory processing. In addition to firing rate adaptation characterized by a rate decrement dependent on previous spike activity, AN fibers show dynamic range adaptation, which is characterized by a shift of the rate-level function or dynamic range toward the most frequently o...

Stroke survivors without cerebellar involvement retain the ability to adapt to the split-belt treadmill; however it has been suggested that their rate of adaptation may be slowed compared to those who are neurologically intact. Depending on limb placement, the split-belt treadmill can be configured to either exaggerate baseline asymmetry, or reduce it, which may affect the behavior of adaptatio...