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—Cooperative communication techniques offer significant performance benefits over traditional methods that do not exploit the broadcast nature of wireless transmissions. Such techniques generally require advance coordination among the participating nodes to discover available neighbors and negotiate the cooperation strategy. However, the associated(More)
—The concept of cooperative retransmission in wireless networks has attracted considerable research attention. The basic idea is that when a receiver cannot decode a frame, the retrans-mission is handled not by its original source but rather by a neighbour that overheard the transmission successfully, and may have a better channel to the destination.(More)
— In this letter, we propose a novel Markov chain model for IEEE 802.11 WLAN, considering a commonly used data rate switching mechanism. In the proposed model, both collision and transmission errors are considered. The performance of IEEE 802.11 DCF (Distributed Coordination Function) is analyzed using the proposed model. The accuracy of the proposed model(More)
The autophagic process involves encompassing damaged proteins and organelles within double- or multi-membraned structures and delivering these molecules to the lytic compartments of vacuoles. Sphingolipids (SLs), which are ubiquitous membrane lipids in eukaryotes, participate in the generation of various membrane structures, including rafts, caveolae, and(More)
IEEE 802.11e standard has been recently published to introduce quality of service (QoS) support to the conventional IEEE 802.11 wireless local area network (WLAN). Enhanced Distribution Channel Access (EDCA) is used as the fundamental access mechanism for the medium access control (MAC) layer in IEEE 802.11e. In this paper, a novel Markov chain model with a(More)
—Cooperative communication methods in wireless networks , ranging from relaying by a common neighbor over a single wireless hop to opportunistic routing at the network layer, have been shown in recent years to offer significant performance gains over traditional approaches that ignore the broadcast nature of the wireless medium, and are particularly(More)
—We consider cooperative retransmission strategies in wireless networks, where the retransmission of a failed frame is handled not by the original source but rather by common neighbors overhearing the transmission. The majority of existing literature in this space focuses on opportunistic mechanisms for choosing a single " best " neighbor, with a goal of(More)
— IEEE 802.11e standard has been published in 2005. In the next few years, we may expect a proliferation of 802.11e capable stations. In the mean time, the legacy 802.11 stations will exist. Therefore, it is of practical significance to study the network performance when 802.11 stations and 802.11e stations coexist. In this paper, a novel Markov chain based(More)
In this paper, the maximum achievable throughput of a single chain wireless multi-hop path is investigated analytically. First, we prove that in an error free radio envi~onme.nt, a wireless multi-hop path (the number of hops k 2:: 3), In whIch all nodes are optimally placed and all links have an identical normalized capacity of 1, has a maximum achievable(More)