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Fast rate adaptation has been established as an effective way to improve the PHY-layer raw date rate of wireless networks. However, within the current IEEE 802.11 legacy, MAC-layer throughput is dominated by users with the lowest data rates, resulting in underutilization of spectrum bandwidth. In this paper, we propose a novel distributed MAC strategy,(More)
With the rapid proliferation of broadband wireless services, it is of paramount importance to understand how fast data can be sent through a wireless local area network (WLAN). Thanks to a large body of research following the seminal work of Bianchi, WLAN throughput under saturated traffic condition has been well understood. By contrast, prior(More)
Prior investigations on the Aloha network have primarily focused on its system throughput. Good system throughput, however, does not automatically translate to good delay performance for the end users. Neither is fairness guaranteed: Some users may starve, while others hog the system. This paper establishes the conditions for bounded mean queuing delay and(More)
To date, most analysis of WLANs has been focused on their operation under saturation condition. This work is an attempt to understand the fundamental performance of WLANs under unsaturated condition. In particular, we are interested in the delay performance when collisions of packets are resolved by an exponential backoff mechanism. Using a(More)
This paper provides a queueing analysis for the slotted Aloha network. We assume the use of an exponential backoff protocol. Most prior work on slotted Aloha focuses on the analysis of its saturation throughput. Good saturation throughput, however, does not automatically translate to good delay performance for the end users. For example, it is well-known(More)
Psoralen (PSO), the active ingredient of Fructus Psoraleae (FP) the dried ripe fruit of Psoralea corylifolia L., has been commonly used in traditional Chinese medicine (TCM) for the treatment of osteoarthritis (OA). We found that PSO activates cartilaginous cellular functions of rat chondrocytes in vitro. However, the effect of PSO on chondrocyte(More)
Today's IEEE 802.11 Wireless LANs (WLANs) usually support multiple transmission rates, where mobile stations adapt their data rates based on their link adaptation strategies. In this paper we analyze the throughput performance of multi-rate WLANs with link adaptation. Specifically, an analytical model is developed to derive the system throughput of both the(More)
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