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As more high tibial osteotomy (HTO) and unicompartmental knee arthroplasty (UKA) are performed, orthopaedic surgeons realize that more HTO and UKA failures will require revision to total knee arthroplasty (TKA) in the future. To systematically evaluate the clinical outcomes of TKA after HTO and TKA after UKA, the Embase, PubMed, Ovid, Web of Science, and Cochrane Library databases were searched for...
IEEE 802.11p is a communication protocol which is extended by IEEE 802.11 standard, mainly used in Vehicular Ad-Hoc Networks (VANETs). VANETs generally include the Service Channel (SCH) and Control Channel (CCH). In the traditional 802.11p protocol, the length ratio between CCH and SCHs is fixed. This paper presents a variable SCH interval(VSI) multichannel medium access control (MAC) scheme under...
Multimedia streaming applications have stringent Quality-of-Service (QoS) requirements. Typically, each packet is associated with packet delivery deadline. We are interested in designing feedback-based adaptive network coding schemes with the aim of minimizing decoding delay and video distortion in wireless broadcasting networks over the packet-erasure channel. In this paper, we first introduce the...
Background The purpose of this systematic review and meta-analysis of randomised controlled trials (RCTs) was to evaluate the pain control by gabapentin or pregabalin administration versus placebo after total hip arthroplasty (THA). Methods In January 2016, a systematic computer-based search was conducted in the Medline, Embase, PubMed, CENTRAL (Cochrane Controlled Trials Register), Web of Science...
Network selection plays an important role in load balancing and radio resources management. In this paper, we use the evolutionary game theory to address the network selection problem in the constrained heterogeneous networks. An indication function is introduced into the payoff function to represent the punishment term. The population dynamics can be obtained by the replicator equations. A centralized...
As a new computing model cloud computing provide users with services subversive with the aid of the vast resources on the Internet system. Cloud computing has been used in network storage, web search, e -mail application and other fields. In order to achieve the fairness of data distribution and improve the throughout and transmission rate, the cloud computing model based on multiservice access dynamic...
In wireless sensor networks (WSNs), power-conserving MAC design is vitally important for sensors which use a power source from a fixed utility or manual battery recharging. In this paper, we propose an energy-efficient sensor selection algorithm with two-hop cooperating transmission, which minimizes the total energy consumption of WSNs by exploiting spatial correlation between sensors without compromising...
In this paper, a feedback-based opportunistic network-coded cooperative scheme is proposed to be combined with cooperative communication in wireless uplink multi-relay networks. Different from previous network-coded schemes that conduct network coding all the time, we propose a scheme that conducts network coding and direct transmission alternately according to the quality of the channels. The outage...
In this paper, a novel carrier frequency offset estimation approach, including preamble structure, carrier frequency offset estimation algorithm, is proposed for hexagonal multi-carrier transmission (HMCT) system. The closed-form Cramer-Rao lower bound of the proposed carrier frequency offset estimation scheme is given. Theoretical analyses and simulation results show that the proposed preamble structure...
To improve the sensing performance, cooperation among cognitive users can be utilized to collect space diversity. In this paper, we propose a novel time-domain cooperative spectrum sensing framework, in which the time consumed by reporting for one cognitive user is also utilized for other cognitive users' sensing. For time varying channels, the novel time-domain combining cooperative spectrum sensing...
Spectrum sensing is one of the most important components of cognitive radio technology. Due to fading or shadowing effects of the channel, a cognitive radio (CR) may fail to sense the presence of the primary user (PU). Cooperative spectrum sensing is a good solution to this problem. In this paper, we focus on the optimization of cooperative spectrum sensing in which multiple CRs efficiently cooperate...
Network coding across multicast transmission can significantly reduce the number of retransmissions for wireless broadcasting. However, most of the existing network coding schemes for these scenarios base on the assumption that each source has priori knowledge of the others, which restricts the application of network coding seriously. In this paper, we propose a multi-relay opportunistic network coding...
Orthogonal frequency-division multiplexing (OFDM) has recently developed as one of the most popular schemes to overcome multipath fading. Single carrier frequency division multiple access (SC-FDMA) has also been adopted as an alternative of OFDMA for uplink transmission in UTRA LTE. To improve the performance of OFDMA and SC-FDMA, cooperative communication can be used. However, traditional cooperative...
Cooperative multicast/broadcast technique which can improve performance of traditional wireless multicast communications system has been paid a broad attention. However, in 2-hop Cooperative multicast system [8], it is easy to arise interference in destination node if all the nodes who decode message correctly in phase 1 forward information to other users simultaneously. In this paper, to solve this...
Self-localization is one of the basic problems in wireless sensor networks. In this paper, we propose a new localization algorithm using received signal strength (RSS) with seven anchors in order to balance the complex technology for distance estimation and the accuracy of the localization. First, based entirely on comparison of received signal strength transmitted by mobile anchors, the static nodes...
Spectrum sharing through receiver beacons can obtain near-optimal sharing of spectrum between primary and secondary systems. Implementation of this in fading environment, however, requires a translation from interference constraint to the system- and device-level design parameters. Within the beacon-assisted spectrum sharing framework, the critical interference probability (CIP), defined as the probability...
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