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In this paper, we present a user equipment (UE) based distributed traffic steering mechanism between long-term evolution (LTE) and Wi-Fi networks. An agent residing in each UE evaluates the traffic condition of the network it is currently connecting to and makes the traffic steering decision. The evaluation is either periodic or event-driven such as access denial in the admission control due to network...
In this work, a novel linear precoding algorithm, called linear precoding-based geometric mean decomposition (LP-GMD), is proposed for the downlink of multi-user (MU) multiple-input multiple-output (MIMO) systems. The proposed scheme suppresses the multi-user interference (MUI) at the BS. Then it uses the GMD to decompose the equivalent single-user MIMO channel into multiple parallel sub-channels...
A transmission strategy that consists of a spatial scheduling algorithm and a precoding algorithm is developed for multi-carrier (MC) multi-user (MU) multiple-input multiple-output (MIMO) systems. The scheduling algorithm, called efficient multi-carrier ProSched (EMC-ProSched), adopts a novel scheduling metric that is able to efficiently perform the user selection for a multi-carrier system. The precoding...
Analyzing on WEP (Wired Equivalent Privacy) indicates many defects existing in security. A security policy of WLAN data transmission based on logistic chaotic modulation is presented. The improved Logistic mapping can carry information in the WLAN data frame through the change of single parameter μ, which can lead to morphological changes of chaotic attractors. The receiver decision device is used...
Local area wireless networks based on IEEE 802.11 have a cellular topology: Stations associate to one of several access points, which are connected using a wired backbone. As connectivity is only possible close to the access points, a dense infrastructure is needed, resulting in high costs. A Wireless Mesh Network (WMN) replaces the wired backbone by radio: Only few access points are installed; mesh...
Service-area specific optimization is a necessity for large-scale wireless networks. For this task, a model to estimate the quality of a radio network configuration is required. In the case of cellular radio networks, much work exists on models for Radio Network Planning (RNP). This work cannot be applied to optimize IEEE 802.11-based Wireless Mesh Networks (WMNs), as their multi-hop structure and...
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