Multiple-frequency slotted ALOHA in a shadowed and Rician faded radio environment

Prasad, R.; Jansen, M.G.; Deursen, J.P. van

doi:10.1049/el:19931216

Cited by 11 publications

(3 citation statements)

References 3 publications

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“…It is well known that the overall system throughput grows for increasing shadow deviation [20] in random medium access control (MAC) techniques due to the capture effect. However, when σ exceed the value of 3 − 4, the capture effect allows the nodes to route the packets along shorter but less reliable paths due to the peculiar topology, as confirmed by the results which account for the average hop number (Fig.…”

Section: Numerical Resultsmentioning

confidence: 99%

Bio-inspired link quality estimation for wireless mesh networks

Caleffi

Paura

2009

2009 IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks &Amp; Workshops

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In this paper, the problem of estimating the link quality in mesh networks has been considered. Such a process is a major task to develop an efficient network layer, since it allows routing protocols to efficiently use neighbors as relays for multi-hop communications. In the last years, a number of link-quality aware routing metrics have been proposed and analyzed. However, such metrics usually adopt simple linkquality estimators based on moving average filters, which lead to poor performances due to their static nature. In this paper, we propose to improve the estimation of the link quality resorting to a bio-inspired estimator based on the neural network paradigm. The effectiveness of the proposal has been proved by means of a numerical performance comparison between the proposed estimator and the traditional ones under several environmental conditions.

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Section: Numerical Resultsmentioning

confidence: 99%

Bio-inspired link quality estimation for wireless mesh networks

Caleffi

Paura

2009

2009 IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks &Amp; Workshops

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“…The performance of multichannel slotted ALOHA system, where multiple equal-capacity channels are shared by many users, has been analyzed in [2,15,27,28]. The design of efficient wireless MAC protocols and the evaluation of their performance in the presence of multichannel transmission (especially in the IEEE 802.11 WLANs) are still an open issue [1,11,22,25,26]; and the common idea as proposed in these papers is somewhat similar to the frequency-division multiple access (FDMA) scheme used in cellular phone systems.…”

Section: Introductionmentioning

confidence: 99%

Distributed multichannel MAC protocol for IEEE 802.11 ad hoc wireless LANs

Chen¹,

Sheu²

2005

Computer Communications

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“…One is to randomly select one channel out of all channels before carrier sensing, while the other is to select one channel out of idle channels after carrier sensing. Prasad et al [4] analyzed the performance of multichannel slotted ALOHA with a method of randomly assigning a channel for each packet in frequency division multi-channel environment. Namboothiri and Sivalingam [5] also analyzed the performance of multi-channel CSMA/CA with a separate control channel for agreement of communication channel between transmitter and receiver.…”

Section: Introductionmentioning

confidence: 99%

Multi-channel CSMA/CA based smart utility networks

Cha

Jin

Sung

2011

2011 6th International ICST Conference on Communications and Networking in China (CHINACOM)

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IEEE 802.15.4g is a recent standard for Smart Utility Networks (SUN). SUN is a house-to-house level subordinate network in the Smart Grid network. IEEE 802.15.4g uses a Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) algorithm for channel access whose performance is limited by collision probability. In this paper, we propose a multi-channel CSMA/CA operation in IEEE 802.15.4g system to mitigate the collision problem, by modifying modulator structures for two physical (PHY) layer techniques of IEEE 802.15.4g, orthogonal frequency division multiplexing (OFDM) PHY, and multi-rate and multi-regional offset quadrature phase-shift keying (MR-O-QPSK) PHY and also propose proper channel selection schemes for multi-channel CSMA/CA based on those PHYs. Moreover, we evaluate the performance of both cases with single channel CSMA/CA and multi-channel CSMA/CA through link-level simulations and system-level simulations. The simulation results demonstrate that the proposed frequency division two-channel based OFDM PHY system yields a 16 percent increase in the maximum throughput, compared with that of the conventional single-channel OFDM PHY system.

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Multiple-frequency slotted ALOHA in a shadowed and Rician faded radio environment

Cited by 11 publications

References 3 publications

Bio-inspired link quality estimation for wireless mesh networks

Bio-inspired link quality estimation for wireless mesh networks

Distributed multichannel MAC protocol for IEEE 802.11 ad hoc wireless LANs

Multi-channel CSMA/CA based smart utility networks

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