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A robust beamforming scheme for the processing of wideband signals against direction of arrival (DOA) estimation errors with frequency response invariant property is proposed, where a response variation (RV) element is invoked to control the consistency of the beamformer's response over the frequency range of interest, simultaneously the eigenvector constraints are combined together to overcome the...
Under the condition of low sample, how to improve the robustness of adaptive beamforming algorithm is a key problem in engineering application. This article first introduces the minimum variance distrtionless response. On the basis, the algorithm of diagonal loading has been researched and how to select the optimal loading value in the practical application has been emphatically analyzed. Finally,...
In this paper, a new subband affine projection algorithm is proposed, which is robust against impulsive noise and presents reduced computational complexity. A subband structure composed of sparse filters in a closed-loop error configuration is used, and the update equation is derived by means of a minimum-disturbance approach with a posteriori subband error constraints, employing a cost function that...
To cater the need of expanding telecom network to rural areas with quality power supply poses a challenge as many areas are still unapproachable to the grid. PV based generation is envisaged to alleviate the problem providing maintenance free and robust in working in low operating cost. The proposed telecom power supply uses a high gain DC-DC MPPT converter having high efficiency and very low current...
The premise and foundation of autonomous landing relative navigation based on vision for unmanned aerial vehicle (UAV) are accurate detection of landing cooperative target. In order to overcome the problem of cooperative target detection susceptible to illumination change and the interference, a new landing cooperative target detection algorithm based on low rank matrix recovery theory is proposed...
Orthogonal frequency division multiplexing (OFD-M)based cognitive radio networks (CRNs) is a promising paradigm to increase spectrum efficiency and achieve flexible resource allocation. However, previous works either lack the consideration of channel uncertainties or ignore the effect of imperfect spectrum sensing. In this paper, we focus on the power control for a downlink OFDM-based CRN with the...
Ultra wide-band (UWB) technology is suitable for high data rate short range wireless communication, localization, and imaging techniques. In many applications, UWB devices may be operating in environments with impulse noise sources or narrow band interferers, called as impulse interferer. Impulse noise of high amplitude and random occurrences can overlap a UWB signal making UWB signal recovery difficult...
Multiple Input Multiple Output (MIMO) techniques used in the 4G-LTE wireless communication standard. Huber M-estimator based robust detector for spatially multiplexing multiple input multiple output communication (SM-MIMO) systems was proposed, and investigated. Generalized Gaussian distribution was used in terms of uncertain noisy environments. The simulation results show that the proposed detector...
The millimeter wave (mmWave) frequencies offer the potential of orders of magnitude increases in capacity for next-generation cellular wireless systems. However, links in mmWave networks are highly susceptible to blocking and may suffer from rapid variations in quality. Connectivity to multiple cells - both in the mmWave and in the traditional lower frequencies - is thus considered essential for robust...
In this paper, we propose a robust distributed relay beamformer design for cognitive radio network operating under uncertainties in the available channel state information. The cognitive network consists of a pair of transceivers and a set of non-regenerative two-way relays that assist the communication between the transceiver pair. The secondary nodes share the spectrum with a licensed primary user...
For time division duplex systems with increased bandwidth in 5G, the concept of self-contained transmission has been proposed. Aiming at reduced latency and more flexible resource allocation, this concept involves frequent uplink and downlink switching and relatively short transmission in both directions. In this work, we consider single OFDM symbol transmission within self-contained transmission...
We study a full duplex (FD) multiple-input multiple-output (MIMO) cognitive cellular network, in which a secondary base-station (BS) operating in FD mode serves multiple uplink (UL) and downlink (DL) secondary users (SUs) operating in half-duplex (HD) mode simultaneously. The spectrum is shared between secondary and primary networks, and thus uplink SUs and secondary BS generate interference on primary...
We propose a robust coordinated game theoretic approach that distributively minimizes the aggregate downlink transmit power in a multicell interference network in the presence of imperfect channel state information (CSI). The optimization is constrained to satisfying the signal-to-interference-plus-noise-ratio (SINR) requirements at individual user terminals within certain predefined SINR outage probabilities...
Topology construction is a vital technique in cognitive radio ad hoc networks. In this paper, considering the nodes residual energy, available channel quality and the interference of primary users, a topology model based on BBV (Barrat, Barthelemy and Vespignani) model and the triad formation mechanism is proposed, which ensure the network topology with both scale-free and small- world features. The...
Cooperative broadcasting is a promising technique for efficient as well as robust broadcast of information in ad hoc networks. The paper compares the capacity of scheduled cooperative broadcasting with the capacity of Spatial Reuse TDMA (STDMA) for broadcast traffic in ad hoc networks. Three different routing methods for STDMA are considered: a tree-based solution; default MPR-flooding; and a robust...
We present results from a detailed comparative study of the performance of three different frequency assignment schemes for interference management in heterogeneous LTE networks. Realistic indoor propagation models are used in order to obtain accurate results. We show that simple graph based frequency assignment schemes yield an excellent compromise between computational complexity and high performance...
This paper deals with the robustness of soft iterative decoders in impulsive interference modeled by Middleton class A distribution, epsilon-contaminated Gaussian noise or a sum of a Gaussian thermal noise and an impulsive alpha-stable noise. The inputs of belief propagation decoder should be the log-likelihood ratios of the received symbols. But in case of impulsive interference, their computation...
With the advent of Internet of Things (IoT) Wireless Sensor Networks (WSN) seem to play key a role in the connectivity of smart objects. The limited resources of WSN devices and the increased demand for new and more sophisticated services call for new and more efficient architectures. The new architectures should ensure energy-efficiency, flexibility, reliability and robustness. We believe that using...
This paper considers a cognitive radio (CR) relay network which consists of a cognitive source, a cognitive destination and a number of cognitive relay nodes that share spectrum with a primary transmitter and receiver. The cognitive source is unable to communicate directly with the cognitive destination and hence uses cognitive relay nodes to create a link to the cognitive destination. Under the assumption...
Based on the use of Fair M-Estimator, Fair robust detection algorithm was introduced, in order to get more robust detector. The proposed algorithm designed for LTE communication networks, which use spatial multiplexing transmission method, in Multiple Input Multiple Output systems. The channel environments used are Additive White Gaussian (AWGN) noise and heavy-tailed noise distributions as an actual...
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