adaptive time varying
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Experiments With Adaptive QoS Management for Multimedia Applications in Heterogeneous Environments
White Paper The Internet is a dynamic network of heterogeneous transmission media with widely varying bandwidth capacities and latency characteristics. Such media rich applications require time bounded processing and communication. [17 Jul 2008]
An Adaptive Anomaly Detector for Worm Detection
White Paper This paper presents an adaptive end-host anomaly detector where a supervised classifier trained as a traffic predictor is used to control a time-varying detection threshold. Training and testing it on real traffic traces collected from a number of... [11 Apr 2008]
Adaptive Control of Virtualized Resources in Utility Computing Environments
White Paper This paper develops an adaptive resource control system that dynamically adjusts the resource shares to individual tiers in order to meet application-level QoS goals while achieving high resource utilization in the data center. [14 Feb 2008]
TCP Performance Over End-to-End Rate Control and Stochastic Available Capacity
White Paper Motivated by TCP over end-to-end ABR, this paper studies the performance of adaptive window congestion control, when it operates over an explicit feedback rate-control mechanism, in a situation in which the bandwidth available to the elastic... [14 Jan 2008]
Improving TCP Over Wireless Through Adaptive Link Layer Setting
White Paper This paper studies the capability of the link layer to hide losses over the wireless link to TCP in spite of the time varying transmission quality. Consider a communication link where the last hop is wireless and TCP is used as transport protocol... [14 Jan 2008]
Mathematical Analysis of Westwood+ TCP Congestion Control
White Paper The estimate is used to adaptively decrease the congestion window and slow start threshold after congestion so that it can be said that Westwood+ TCP substitutes the classic multiplicative decrease with an adaptive decrease paradigm. [20 Dec 2007]
Round-Trip Time Estimation in Communication Networks Using Adaptive Kalman Filtering
White Paper Heterogeneous communication networks with their variety of application demands, uncertain time-varying traffic load, and mixture of wired and wireless links pose several challenging problem in modeling and control. [05 Dec 2007]
Adaptive Optimal Frame Length Predictor for IEEE 802.11 Wireless LAN
White Paper Wireless channel is dynamically time-varying and bursty caused by fading, noise and interference, shadowing, path loss and so forth. This paper presents an optimal frame length predictor in terms of maximizing the channel utilization. [04 Dec 2007]
Estimation of Mobile Speed and Average Received Power in Wireless Systems Using Best Basis Methods
White Paper The estimator is shown to perform significantly better than an adaptive averaging method described in the literature. An estimate of the time-varying Doppler power spectrum is obtained together with an estimate of the maximum Doppler frequency... [17 Aug 2007]
Estimation of Mobile Speed and Average Received Power in Wireless Systems Using Best Basis Methods
White Paper The estimator is shown to perform significantly better than an adaptive averaging method described in the literature. An estimate of the time-varying Doppler power spectrum is obtained together with an estimate of the maximum Doppler frequency... [17 Aug 2007]
Dynamic Fragmentation Scheme for Rate-Adaptive Wireless LANs
White Paper Many rate-adaptive MAC protocols have been proposed in the past for wireless LANs over time-varying media to provide efficient channel usage and throughput enhancement. However, these protocols do not consider the possible bursts transmission of... [01 Aug 2007]
Utility-Based Joint Physical-MAC Layer Optimization in OFDM
White Paper In this paper, joint physical-MAC layer optimization in OFDM systems using adaptive modulation and subcarrier allocation is investigated based on utility theory. The paper formulates cross-layer optimization problem as one that maximizes the sum of... [13 Apr 2007]
Pilot-Tone Based ZP-OFDM Demodulation for an Underwater Acoustic Channel
White Paper Existing coherent underwater acoustic communication systems rely on single carrier transmission and adaptive decision feedback equalization to deal with time-varying and highly dispersive UnderWater Acoustic (UWA) channels. [11 Apr 2007]
MU-OFDM Power and Subchannel Allocation Performance on DSP
White Paper In order to maximize the capacity of a time-varying channel, wireless transceiver designers often implement adaptive modulation that adjusts transfer parameters such as power distribution, coding and modulation schemes, and signaling bandwidth. [11 Apr 2007]
An Adaptive Two-Dimensional Channel Estimator for Wireless OFDM With Application to Mobile DVB-T
White Paper In this paper an adaptive channel estimator is proposed and investigated to improve the performance of the receiver for pilot aided wireless and mobile OFDM systems. The paper proposes an efficient algorithm for adaptation to time varying channels... [11 Apr 2007]
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