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Throughput Performance (throughput + performance)

Distribution by Scientific Domains

Engineering	80%

Selected Abstracts

Theoretical performance evaluation of EDCA in IEEE 802.11e wireless LANs

EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS, Issue 3 2010
Fei PengArticle first published online: 25 SEP 200
While the original IEEE 802.11 distributed coordinated function (DCF) has been widely analysed by both theoretical and simulation studies, the performance of the new IEEE 802.11e enhanced distributed channel access (EDCA) has not yet been investigated extensively. In this paper, we extend an analytical model to capture the operations of the arbitrary inter-frame space, contention window differentiation and transmission opportunity in EDCA for the evaluation of throughput performance and collision probability of different service classes. The performance analyses are validated by simulation results. Our analysis provides insightful results for evaluating the impact of different priority parameters on the performance of EDCA service differentiation. Copyright © 2009 John Wiley & Sons, Ltd. [source]

Hybrid ARQ schemes for DS spread spectrum systems in the presence of narrow-band interference

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 4 2002
Abdulhameed M. Al-Sanie
Abstract This paper is concerned with a direct sequence spread spectrum system making use of automatic repeat request (ARQ) schemes and operating in the presence of narrow-band (NB) interference and additive white Gaussian noise. In this study, we evaluate the system's throughput efficiency when a suppression filter is employed at the receiver to mitigate the effect of NB interference. Specifically, we investigate how the performance is influenced by various parameters such as the number of filter taps, processing gain, type of interference, and the signal power-to-interference power ratio. The simulation results show that using the suppression filter significantly improves the throughput performance of the hybrid ARQ schemes in the presence of NB interference. Copyright © 2002 John Wiley & Sons, Ltd. [source]

TCP-Peach for satellite networks: analytical model and performance evaluation

INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS AND NETWORKING, Issue 5 2001
Ian F. Akyildiz
Abstract Current TCP protocols have low throughput performance in satellite networks mainly due to the effects of long propagation delays and high link error rates. TCP-Peach is a new congestion control scheme for satellite IP networks based on the use of low priority segments, called dummy segments. The sender transmits dummy segments to probe the availability of network resources. Dummy segments are treated as low priority segments thus, they do not effect the throughput of actual data segments. In this paper, TCP-Peach is presented along with its analytical model which is used to evaluate the throughput performance. Experiments show that TCP-Peach is robust to high link error rates as well as long propagation delays, and outperforms other TCP schemes for satellite networks. Copyright © 2001 John Wiley & Sons, Ltd. [source]

Design and analysis of an IEEE 802.16e-based OFDMA communication system

BELL LABS TECHNICAL JOURNAL, Issue 4 2007
Krishna Balachandran
IEEE 802.16e has emerged as a strong candidate standard for future wireless systems primarily because it offers the potential for high spectral efficiency, flexible spectrum options (e.g., 2,6 GHz), scalable carrier bandwidth options (e.g., from 1.25 MHz to 20 MHz), multiple duplexing options (time and frequency division duplex), various subchannelization options, and, unlike its IEEE 802.16 predecessors, mobility. Because of the recent emergence of IEEE 802.16e and the complexity it poses in system analysis, there is little published work in the literature regarding the actual system capacity/ throughput performance of IEEE 802.16e for high data rate services. In this paper, we investigate the link and system level performance on the downlink of an IEEE 802.16e-based orthogonal frequency division multiple access (OFDMA) communication system and provide recommendations on high performance IEEE 802.16e system design and deployment configurations. We also propose dynamic resource allocation methods that may be used in OFDMA systems and investigate their performance. @ 2007 Alcatel-Lucent. [source]