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Many application classes, such as archiving, backup of thousands of nodes in an organization, video sharing, etc., require highly reliable and scalable storage systems. Since it is now feasible to build such storage systems with advanced open source technologies, the challenge becomes how to best utilize those technologies to build and operate such a storage system with optimized cost and performance...
In this paper, an opportunistic channel access for cognitive radio networks (CRNs) with multiple channels is proposed, whereby the secondary users (SUs) cooperate with primary users (PUs) to improve the latter's throughput and gain transmission opportunities in return. Cooperation on single channel is studied first, which is modeled by the Stackelberg game. By analyzing the game, the access time allocation...
Cellular systems operate on ISM band with the co-existence of wide-deployed WLAN is a promising solution to offload the crowded cellular band, where cellular device acting as virtual a WLAN station contends for WLAN channel resource via applying the same IEEE 802.11 Distributed Coordination Function(DCF) as WLAN rivals is a straightforward way. However, the conventional mechanism cannot fully utilize...
This paper presents a solution to counter black hole attacks in mobile ad hoc networks (MANETs). Black hole attacks are effective DoS (Denial of Service) attacks committed by fabricating routing information, attracting packets routed through them, and then dropping the packets. The ETX (Expected Transmission Count) metric is a common routing metric in MANETs. It measures the delivery ratio of a wireless...
Due to spectrum scarcity and emerging various wireless applications in IMT-Advanced system, spectrum allocation scheme becomes a recently critical issue. In this paper, we refer to the concepts of spectrum reservation and power reward, make use of maximum-minimum criteria, propose a cellbased distributed dynamic spectrum allocation (DSA) algorithm which combines the water filling power allocation...
In this paper, one of the QoS models for MANETs-SWAN is studied under varying conditions to provide both quantitative and qualitative assessments of the applicability of the model in different scenarios. Results and analysis from NS-2 based simulation indicate that (i) real-time (RT) applications in SWAN-enabled mobile ad hoc networks experience low and stable delays under various traffic and mobility...
In this paper a novel multipriority reservation protocols for plastic optical fiber network is proposed. In conventional OCDMA system only allows finite units to transmit and access simultaneously according to the number of channels which be restricted by BER. To resolve this problem, a novel protocol based on slotted ALOHA is proposed in this paper. By using the reservation scheme and a distributed...
A WLAN SoC for video applications handles IEEE 802.11a/b/g and supports PHY data rates to 108 Mbit/s. The SoC implements two chain maximum ratio combining and beamforming. Video features include a jitter removal system and MPEG-TS packet aggregation. Measured results on the 7.2mm/spl times/7.2mm IC using a 0.18 /spl mu/m CMOS process demonstrate throughput improvements in both RX and TX.
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