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This paper considers a coordinated robust design of beamforming and power allocation under per-BS power constraints in a multicell multiuser downlink network with only imperfect channel state information (CSI) is available at both base stations (BS) and mobile users (MU). Our goal is to maximize the weighted sum rate while taking imperfect CSI into account. Due to the intractability of the original...
A novel RB-WC-FI-FB (robust worst-case frequency invariance forward-backward) wideband beam former is proposed in this paper. It is developed to improve the robustness against estimation errors of direction of arrival (DOA) and limited sample number, as well as reduce the number of constraints. By incorporating forward-backward estimation and worst-case performance optimization method into the linearly...
Considering the characters of the precision scanning and tracking system in spaceborne spectrometer, a H∞ robust controller design approach was proposed. Firstly, establish the mathematical model of optical scanning system. On this basis, in order to achieve the requirements of the control performance and robustness, use H∞ mixed sensitivity design method and elaborate the choice basis and the determine...
In this paper, we consider a worst-case based robust beam forming approach for two-way relay networks that consist of two transceivers and multiple relays. Both the transceiver-to relay channels are assumed to have norm-bounded channel estimation errors. The worst case of the problem in a norm defined error set is optimized to guarantee the performance of the actual case. The resultant beam forming...
Intentional jamming and spoofing are growing concerns for communication and positioning systems based on Global Navigation Satellite System (GNSS). In the maritime sector, intentional interfering signals might induce poor performance of the GNSS receivers, that, in severe cases, are unable to provide reliable measurements. On board of vessels, the failure of the GNSS receiver propagates to multiple...
Multicell coordinated beamforming, where multiple base stations (BSs) collaborate with each other in the beam-vectors design to mitigate the intercell interference (ICI), has been a subject of great attention recently. With perfect channel information available at the base stations, we first present a fast converging algorithm that solves the weighted sum rate maximization (WSRM) problem. Then, the...
In this paper, we propose a coordinated pilot reuse (CPR) scheme for multi-cell massive multi-input multi-output systems to reduce the pilot overhead. Unlike the conventional pilot reuse scheme which allows pilots to be reused only among different cells, CPR allows inter- and/or intra-cell user equipments to reuse the same pilots, efficiently reducing the pilot overhead. For the spatially correlated...
In this study, we propose a robust transceiver scheme with switched preprocessing (SP) for K-user multiple-input multiple-output (MIMO) interference channels. The channel state information (CSI) available is assumed to be imperfect under norm-bounded errors (NBE). Each transmitter is provided with a codebook of permutation matrices, so that each arrangement of permutation matrices among the K transmitters...
In this paper, we investigate robust precoding for two-way relay cognitive networks consisting of a pair of cognitive transceiver users equipped with Multiple Input Multiple Output (MIMO) antenna communicating with each other through a common multi-antenna relay and sharing the same spectrum with primary users (PU). The uncertainty set in this CSI model is defined as Norm Bounded Error (NBE) model...
When remote sensing satellites in-orbit observe the earth, the imaging quality will be declined because the load electronic system is influenced by the interference signal. To ensure imaging performance of the actual model with uncertainty under external disturbance, in this paper the load electronic system mathematical model is proposed under the noise, and transformed into state space equations...
In this paper we propose a design framework for a multi-user full-duplex (FD) relaying system, which operates with decode-and-forward (DF) protocol. Our study starts with defining a system model which encompasses the limits of a FD system to overcome its own loopback self-interference. Afterwards we present a fair design strategy for the defined system focusing on the case where perfect channel state...
Connectivity and robustness of ad-hoc cognitive radio network are the challenges faced by cognitive radio network due to moving nature of the channels, which are available for the communication to take place, among cognitive radio nodes. This challenge can be addressed by the concept of Clustering, which groups the neighboring nodes of a cognitive radio network. It helps the node to switch to other...
In this paper the robustness of a four-element compact navigation antenna array against continuous-wave interferers is investigated. The compact antenna array is integrated with an analog decoupling and matching network to mitigate the mutual coupling between the antenna elements and restore efficient diversity gain. It is observed that the network improves the equivalent carrier-to-interference-plus-noise...
We propose a novel method for joint probabilistic constrained robust beamforming and antenna selection used in cognitive radio (CR) networks. Assuming complex Gaussian distributed channel state information (CSI) errors, the Bernstein-type inequalities are used to transform the no closed-form probabilistic constrained into the deterministic forms. Moreover, l1-norm is introduced as the closest convex...
For the complexity of ocean environment, the motion of ship is a very complicated movement, it's very important to develop a suitable mathematical model to describe it quite exactly. Also the ship control system is a nonlinear, mutative and multi-variable system which poses many new problems and challenges for trajectory tracking control methods of unmanned ship. In this paper, a nonlinear mathematical...
In ideal cases, assumptions are made that the direction of the desired signal is accurately known and there are no array position errors. But in practice, some errors of DOA estimation and array geometries will bring the uncertainty of steering vector of the desired signal. Then, investigation is needed to solve the beamforming problem when steering vector error is uncertain. In this paper, we propose...
The robust H∞ pinning synchronization issue for a class of chaotic nonlinear complex networks under the external interference is investigated in this paper. Based on the Lyapunov stability theory and the linear matrix inequality (LMI) technique, several synchronization criteria are proposed to ensure synchronization via pinning control with a guaranteed H∞ performance index. Moreover, the control...
The performance of adaptive beamforming degrades in presence of signal model mismatches. In particular, when the desired signal is present in training snapshots, the adaptive beamforming is quite sensitive to desired signal steering vector mismatch. Therefore, a robust adaptive beamforming for actual system is proposed based on the reconstruction of interference covariance matrix and mismatched steering...
In this paper, a new robust filtered-x LMS algorithm is proposed for active vibration control system. A Tracking-Differentiator filter and a non-linear transformation function are designed to process the reference and error signals respectively. The updating formula of the filter coefficients in the proposed algorithm is derived from a new minimization criterion that minimizes the Euclidean norm of...
Applications in intelligent environments are context-aware and context-altering in order to support users in their everyday tasks. In multi-user environments with shared context, interferences are likely to occur. An interference is an application-induced context that forces other applications to react. In our COMITY project, we developed interference detection and resolution algorithms. However,...
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