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With the dramatic increase of mobile data traffic in the foreseeable future, small cells are set to play an important role in expanding the target capacity of wireless networks. At the same time, to balance the load among all the small cell base stations (SBSs) becomes more and more important. We consider this problem in a user-centric way, where users are able to make decision to choose their SBSs...
Information fusion for target detection in heterogeneous radar sensor networks (HRSN) is an attractive research area. By considering the heterogeneity of HRSN that different local radar sensors have different detection performances, we propose a decision fusion algorithm using optimized energy allocation in this paper. Simulation results show that compared with equal energy allocation scheme, the...
Relaying has been regarded as an effective technique to meet the challenge of network coverage extension. Although relaying can improve cell-edge user performance, cell-center users may suffer serious interference from relay stations. Therefore, intra-cell interference and inter-cell interference have been two major problems which degrade the entire network performance under improper relay deployments...
Fountain code is a class of graph-based linear erasure codes, which can effectively solve the problems such as network congestion and feedback cracking for its characteristics of rateless and can resume when interrupted, and has a lower complexity of encoding and decoding. However, there are still some problems in the process of encoding and decoding, including the degree distribution structure may...
Joint optimization of user association, resource allocation and Almost Blank Subframe (ABSF) based enhanced Inter-Cell Interference Coordination (eICIC), on which macro-cells mute for scheduling the pico users, is of great importance to further improve the network performance in HetNets, however, the introduce of ABSF makes analyzing resource allocation extremely difficult because this results in...
In this paper, a fuzzy logic approach (Type-1 Fuzzy Logic Classifier (T1FLC)) is proposed to improve flight recognition ratio. On a basis of measurements, we acquire the high range resolution profiles (HRRP) of three types of air targets, namely F-15, Tu-16 and AH-64. The length and the difference between the two adjacent HRRPS are extracted as two antecedents for the T1FLC. Gaussian membership functions...
The propagated sound waves in an indoor environment hit the surfaces of solid objects and produce reverberant speech signals. Reverberated speech signals in noisy acoustical environments cause some problems such as reducing speech intelligibility, distinguishing speakers, locating source, quality for hands-free telephony, hearing aid, etc. Adaptive filters can be applied to suppress the interfering...
Radio interfaces of satellite component of the IMT-Advanced system were recently developed by International Telecommunication Union — Radiocommunication (ITU-R), and they were specified in the Recommendation ITU-R M.2047. The set of techniques specified in the Recommendation can be used to provide high quality mobile satellite services with efficient spectrum utilization, and the candidate services...
This paper considers a cognitive radio network where multiple secondary users (SUs) sharing multiple channels with the primary user (PU). The SUs are assumed to carry delay-sensitive services, thus the concept of effective capacity, which is defined as the maximum supported constant arrival rate under the delay quality of service (QoS) constraint, is adopted. Beside the delay QoS constraint, the interference...
We investigate physical-layer security (PLS) for multi-antenna and multi-relay networks with transmit beamforming and relay selection under feedback delay. The connection outage probability (COP) and secrecy outage probability (SOP) are derived to evaluate the reliability and security. Besides, we introduce a novel definition of the reliable-and-secure probability (RSP) to combat the correlation between...
This paper proposes a joint spatial division multiple access (SDMA) and interference suppression multiuser transmission scheme for massive multiple input multiple output (MIMO) systems working at millimeter-wave frequencies. Based on the sparsity of the beamspace channel matrix, we select several beams that capture the channel's main lobe to approximate the original highrank channel. After judging...
This paper proposes a high-sum-rate maximum signal-to-interference and noise ratio (Max-SINR) plus maximum signal-to-leakage and noise ratio (Max-SLNR) beamforming per user (Max-SINR plus Max-SLNR per user) at the relay station (RS) for multi-pair two-way relay system with multi-antenna users. The proposed beamformer applies Max-SINR and Max-SLNR to uplink and downlink channels, respectively. It beam-forms...
In multiple-input single-output (MISO) multi-cell systems, the problem of maximizing downlink sum-rate with random beamforming (RBF) is investigated under O(1) feedback constraint about the average number of feedback users. A sufficient condition is first analyzed to guarantee the single-cell sum-rate as a Schur-concave function, which leads to the optimality of solving this problem by using the homogenous...
Current satellite coverage architectures generally assumes uniform traffic distribution among all beams, giving rise to uniform beam coverage pattern along with equal beam bandwidth allocation. However, the uniform coverage is not suitable for the unbalanced traffic scenarios, e.g. the metropolis region and emergency communication during disaster, which is characterized by the fact that there is single...
The growing energy consumption driven by dramatic increases in data usage becomes the key issue for the users in meeting demands on longer battery life. Thus, managing energy efficiency should be the first priority for mobile terminals. In this paper, our aim is to improve the users' energy efficiency in heterogeneous network environments. To this end, we propose a network selection mechanism that...
With the explosive growth of the Internet traffic, data compression can be a powerful technique to improve the efficiency of data transfer in networks and consequently reduce the cost associated with the transmission of such data. Recently, we proposed a memory-assisted compression framework that utilizes the packet-level memorized context to reduce the inevitable redundancy in the universal compression...
Satellite and terrestrial integrated mobile communication systems (STICS) is proposed to construct economical and highly-reliable communication networks. One of the promising approaches to share the frequency spectrum in STICS is dynamic spectrum assignment, which dynamically divides the spectrum into two parts according to the traffic demand of terrestrial service and satellite service. As smaller...
The future wireless services/applications should be provided in a cost-efficient manner due to the limited system resources. Considering the cost efficiency of the cognitive radio (CR) network, we define a utility function which jointly considers the benefit and the cost. The cognitive users (CUs) will get benefit if they are able to utilize the licensed spectrum, while they should pay the cost of...
Mobile video streaming has gained growing popularity with the rapid adoption of mobile devices (e.g., smart-phones, tablets, pads). In the market of mobile devices, a large portion were installed with Google's Android as the default operating system. A clear understanding of the Android media framework is of great importance for the performance optimization of mobile video streaming. In this paper,...
In mobile underwater environment, underwater wireless sensor networks(UWSNs) keep moving and dispersing due to water flowing and aquatic creatures touching, and thus some isolated nodes appear. This type of isolated nodes cannot obtain enough anchor nodes in their communication range, which makes self-localizations disabled. In order to solve this problem, a multi-hop localization scheme is proposed...
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