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The increasing data demand of mobile users in the rural environment makes the provision of the Internet access quite challenging. Specialized relay stations can help to enhance the network coverage, but in geographically difficult terrains with users being widely scattered, their usage becomes economically and operationally difficult. In this paper, we propose to utilize the ordinary mobile users...
Cloud radio access network (C-RAN) has been shown to reduce both capital and operating expenditures and provide high spectral efficiency (SE) and energy efficiency (EE). High density of remote radio heads (RRHs) deployments results in inefficient energy consumption. Moreover improvements in the battery capacity of mobile devices lag far behind the surging demand for transmit power, which makes power...
Industrial environments are typically characterised by high levels of interference. Therefore, standards for industrial wireless sensor networks (WirelessHART, ISA 100.11a, and IEEE 802.15.4e) have defined a time division and multichannel-based mode of operation, in which time slots and channel pairs are assigned to links representing communication between nodes. In IEEE 802.15.4e this mode of operation...
Due to the open access nature of wireless communication environment, physical layer security has brought increasingly high attention in recent years, attempting to protect the confidential communication away from eavesdroppers. In contrast to the current secrecy designs, which generally exploit the spatial Degree-of-Freedom (DoF) (e.g. MIMO and cooperative relay approaches) or the temporal DoF (e...
Hybrid precoding provides a compromise between the system performance and the implementation complexity in millimeter wave (mmWave) systems, while cloud radio access network (C-RAN) is a green network composed of central baseband unit (BBU), distributed low-cost remote radio heads (RRHs) and low-latency fronthaul links connecting BBU and RRHs. This paper jointly optimizes the user scheduling and hybrid...
In order to improve the spectrum utilization rate of Device-to-Device (D2D) communication, we study the hybrid resource allocation problem, which allows both the resource reuse and resource dedicated mode to work simultaneously. Meanwhile, multiple D2D devices are permitted to share uplink cellular resources with some designated cellular user equipment (CUE). Combined with the transmission requirement...
In case of the decision of the task of design of automated control systems for crucial objects, a minimum possible level of risks at uncontrollable interference in the processes of functioning of these systems, and also minimization of negative consequences from a similar interference in the course of its operation are required. In connection with this, on the basis of the system theory of conflict...
Conventional radar generally uses fixed transmit waveform, which is difficult to obtain optimal target detection performance in the presence of interference. To solve this problem, a joint optimization algorithm of waveform and receiving filter for MIMO radar is proposed. Firstly, the maximization of output signal to interference plus noise ratio is used as objective function. The joint optimization...
In recent years, wireless LAN systems that utilize a wideband channel have been used in many cases, so that the problem of wireless LAN interference often occurs. In order to solve the wireless LAN interference problem, various interference management methods have been proposed. Among them, interference alignment algorithm is the most popular. In order to overcome the limitations of existing interference...
Orthogonal frequency division multiplexing access (OFDMA) inherently suffers from large spectral sidelobes, which will lead to interference between users and can not be ignored. In this paper, in order to suppress spectral sidelobes, we propose a novel windowing scheme. The derivation of the optimum window function is based on the solution of an optimization problem. It aims to minimize in-band-out-of-subband...
This paper investigates user selection and power allocation algorithms in multi-cell massive Multiple-Input Multiple-Output (MIMO) systems. The focus is on designing an algorithm that maximizes a particular cell of interest's sum rate taking into consideration the interference from other cells. This research extends previous work and proposes suboptimal per cell resource allocation models that are...
With the abundance of mobile connected devices and coexisting networks, localization solutions are inevitably subject to interference. In this paper, effects of interference on the performance of Fingerprinting Localization Algorithms (FPS) are studied both theoretically and through experimentation. The previously introduced theoretical framework based on Hypothesis Testing (HT) problem is employed...
In the ultra dense network (UDN), user-centric virtual cell (VC) has been proposed to weaken the traditional concept of base station centric cell, where each user is served by several transmit points (TPs). The overlapped VCs in UDN will result in severe inter-VC interference and degrade the system throughput. Merging overlapped VCs can transform the serious inter-VC interference into intra-VC interference,...
Aiming at the problem that the dynamic arrival of the virtual network requests in the wireless network environment leads to the unbalanced allocation of the substrate network resources and the low acceptance rate of the subsequent requests, a topology-aware wireless virtual network embedding algorithm (WVNEA-TA) is proposed. By analyzing the dynamic topological attributes of the virtual network and...
In this paper, minimum MSE based interference alignment (IA) algorithm is developed for the interfering broadcast channel (IBC), which models the multi-cell downlink system, underlying cognitive radio, device-to-device and other scenarios. The IA precoders and decoders are computed to minimize the MSE. Cascade design is used for IA precoder design, where the first component precoder is obtained by...
For improving the method of FastICA to separate garbled secondary surveillance radar (SSR) replies signals having fault in time for separating and calculated amount, an improved method was proved in this paper. Firstly, the algorithm uses PA to estimate the separating matrix W. Then using iteration on measures of negentropy to get the best matrix. Finally, garbled signals are separated effectively...
While a certain sound serves a purpose to someone, for others, the same sound could be noise. Specifically, an alarm sound would be necessary for someone to wake up and start the day, while it would be an unwanted sound for people sharing the same room, who need not wake up as early. Noise cancellation is useful in this scenario, but most existing techniques require costly equipments (e.g., high quality...
It is an important guarantee to ensure highly reliability, strong adaptability of distributed spacecraft that the adaptive cooperatives control for integration of the attitude and position. According to the performance requirement of the distributed spacecraft in the process of configuration adjustment, there is established a integration model of position and attitude based on dual quaternion, and...
Particle swarm optimization (PSO) algorithm is a random search method based on population evolution. At present, most of the convergence and search stability of the study are using a method of analyzing deterministic systems. Although these studies have achieved fruitful results, but they ignore the randomness of the PSO algorithm which is the most important feature. The complexity and uncertainty...
In this paper, we jointly perform the cell selection and activation (CSA) to maximize the network energy efficiency (EE) under users' long-term rate constraints for green communications in ultra-dense heterogeneous networks (UD-HetNets). The finally formulated problem is in a mixed-integer fractional form and hard to tackle. We first transform it into a parametric subtractive form, by which we reach...
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