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We propose and analyze spatial diversity combining and selection schemes in a wireless-powered communication network with multi-antennas at energy access point (EAP) and data access point (DAP). The EAP adopts either maximal-ratio transmitting or transmit antenna selection to wirelessly transfer power, and the DAP employs either maximal-ratio combining or receive antenna selection to combine the received...
In this work, we consider a multiuser communication system in fading channels where the transmitter is supplied by hybrid energy sources including power grid and various renewable sources. Specially, the energy harvested from various renewable sources is stored in a limited capacity buffer, and the joint energy incoming is time-varying and possibly unpredictable. In addition, data arrives randomly...
It is an indispensable step to faithfully evaluate and control the perceptual quality of digital visual applications such as image compression, image restoration and multimedia streaming. In this paper, we propose an efficient and effective twostep framework named First No-reference Then Full-reference (FNTF), to evaluate different kinds of noise, and distinguish the quality of distorted image, using...
This paper studies the resource allocation problem for spectrum-sharing femtocell networks. An auction-based algorithm, VCG auction, is proposed to ensure femtocell users submit their utilities truthfully despite the selfish nature of them, so that the resource allocation scheme works efficiently and fairly. We investigate the uplink transmission in a sparsely deployed scenario of Femto-network. By...
In this paper, we analyzed TCP performance in UWB WPAN by establishing UWB test-bed. Impact of asymmetry between forward link and reverse link was concerned. Furthermore, we analyzed relationship between TCP throughput and reverse link bandwidth. Our study demonstrated that available resource of reverse link impacts TCP performance seriously. In addition, it was found that there is an optimal reverse...
In this paper, we proposed a new approach, based on principal component analysis (PCA), to evaluate user satisfaction of packet service in GPRS network. Based on our experiment, correlations between different QoS parameters are provided. At the same time, a PCA based user satisfaction factor is defined which reflects the user experience.
In this paper, we proposed an architecture of cooperative cache for UMTS/WLAN hybrid network. Users can communicate with each other through WLAN domain in the hybrid environment. Based on the performance comparison of traditional cache and cooperative cache, our analysis shows that a leap of user experience can be achieved by WLAN side cooperation. In addition, we discussed three directions of web...
In this study, feasibilities of HTTP specific acceleration and TCP optimization in mobile network are analyzed through comparisons. Based on these analyses, practicable accelerator architectures for Web latency reduction are presented. Furthermore, we proposed that a boost in performance is feasible by either deploying cooperative proxies with concurrent connection or combining the characteristics...
In this paper, resource allocation for mixed traffic in wireless access networks is investigated and a utility-based resource dynamic allocation (URDA) algorithm is proposed. This algorithm considers the QoS characteristics, real-time resource requirements and wireless channel states that belong to different types of applications, and then generates utility functions of them. The resource is allocated...
In wireless personal area networks (WPANs), a successful design of scheduling scheme is critical for video traffic in QoS guarantee and efficient channel resource utilization. In this paper, we propose a novel cross-layer scheduling scheme for MPEG traffic in high speed WPANs. The scheme aims at introducing robust improvements to MPEG traffic scheduling by taking most advantages of traffic characteristic...
In this paper, we described the correlations between uplink packet latency of TCP, application traffic characteristics and uplink characteristics. Our study demonstrated that the packet latency in uplink direction mainly caused by TCP setup time instead of the packet size and the bandwidth. In addition, we also found that TCP failure number varies with the configurations of PDCH in BSS.
Applications over HTTP are expected to play its persistently important role in the future heterogeneous networks. The purpose of this study is to analyze emerging characteristics of HTTP traffic which has dramatically changed both in payload and transfer method in the past few years. Beginning with a discussion of well-known models in literature, we emphasize on their applicability in the future networks...
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