Consider the MIMO interfering broadcast channel whereby multiple base stations in a cellular network simultaneously transmit signals to group of users their own cells while causing interference other cells. The basic problem is design linear beamformers that can maximize system throughput. In this paper we propose transceiver algorithm for weighted sum-rate maximization based on iterative minimization mean squared error (MSE). proposed only needs local knowledge and converges stationary...

Node localization is essential to most applications of wireless sensor networks (WSNs). In this paper, we consider both range-based node and range-free with uncertainties in range measurements, radio range, anchor positions. First, a greedy optimization algorithm, named sequential (SGO) presented, which more suitable for distributed than the classical nonlinear Gauss-Seidel algorithm. Then unified framework proposed localization, two convex formulations are obtained based on semidefinite...

Consider the multiple-input multiple-output (MIMO) interfering broadcast channel whereby multiple base stations in a cellular network simultaneously transmit signals to group of users their own cells while causing interference each other. The basic problem is design linear beamformers that can maximize system throughput. In this paper, we propose transceiver algorithm for weighted sum-rate maximization based on iterative minimization mean-square error (MSE). proposed only needs local...

In this paper, a novel interference coordination scheme based softer frequency reuse (SerFR) to mitigate inter-cell in Orthogonal Frequency Division Multiple Access (OFDMA) cellular systems is presented. OFDMA systems, the most important source. Inter-cell considered improve coverage and increase date rate at cell edge. Soft Reuse (SFR) proposed 3GPP Long Term Evolution (LTE). But cause selective scheduling gain loss, peak for edge users low because only can use fraction of entire band....

Summary Geothermal energy is regarded as a promising and attractive alternative to traditional sources, with the concept of enhanced geothermal systems (EGS) enabling viable commercial development. EGS modeling requires integration multiscale, multiphysics processes, necessitating comprehensive numerical model effectively evaluate heat extraction performance. The advantages explicitly representing fracture networks directly simulating thermal-hydrologic-mechanical (THM) coupling coupled...

We propose a novel spectrum-sensing method for cognitive radio (CR) based on stochastic resonance (SR). The spectral power of primary users (PUs) can be amplified, and the signal-to-noise ratio (SNR) received signal increased using SR. This ensures that detection probability proposed approach is higher than traditional energy detector. also theoretically derived under constant false-alarm rate (CFAR). Performance analyses computer simulation results show effectiveness SR-based approach,...

This paper investigates the price-based power control problem in spectrum sharing cognitive radio networks. The primary user (PU) can admit secondary users (SUs) to access by pricing their interference under constraint. We model interaction between PU and SUs as a Stackelberg game. revenue function of is expressed nonconcave SU's transmit backward induction. Variable substitution used transform maximization into concave problem. Based on equivalent problem, novel algorithm proposed find...

This letter investigates price-based power control problem in the spectrum sharing cognitive radio networks (CRNs). The base station (BS) of primary users (PUs) can admit secondary (SUs) to access if their interference is under constraint (IPC). In order spectrum, SUs need pay for power. BS first decides price each maximize its revenue. Then, SU controls transmit revenue based on non-cooperative game. We model interaction between and as a Stackelberg Using backward induction, function...

The performance of a dual-hop fixed gain amplify-and-forward multiple-input multiple-output relay network is analyzed. Both the station and mobile are subjected to multiple co-channel interferers. An exact closed-form expression derived for outage probability which validated by Monte Carlo simulations. Furthermore, render insights into effect multi-antenna interference on performance, asymptotic behavior also investigated. Our results show that diversity order determined minimum antenna...

Future backscatter RFID systems are required to be more reliable and data intensive for emerging fields such as Internet of Things (IoT). Motivated by this, orthogonal space-time block code (OSTBC), which is very successful in mobile communications its low complexity high performance, has already been investigated MIMO RFID. Also a recently proposed scheme called unitary query was shown able considerably improve the reliability exploiting diversity. Therefore, incorporating classical OSTBC...

In this letter, we study user grouping and beamforming for high altitude platform (HAP) massive multiple-input multiple-output (MIMO) systems. We first exploit the fact that signal power mainly concentrates on statistical-eigenmode (SE), then use it to perform design outer beamformer. The is realized based average chordal distance between SEs instead of covariance eigenspaces users in same group. case, complexity a singular value decomposition avoided. beamformer designed using...

This paper presents a stability model that can make rapid prediction of the rotating stall inception in turbomachinery and provide spatial distribution corresponding instability mode. In addition, this take three-dimensional geometry blades complex flow details compressor into consideration, solution development process small perturbations be converted to nonlinear eigenvalue problem. We propose method by converting problem generalized one; then, it solved Arnoldi algorithm. The proposed...

The measurement results in land mobile satellite (LMS) communication scenario have shown that the propagation characteristic of LMS channel is a non-stationary process. In this paper, three-dimensional (3-D) wideband geometry-based stochastic model (GBSM) and corresponding simulation are proposed for high-altitude platform (HAP) multiple-input multiple-output (MIMO) system. GBSM uses two-dimensional (2-D) one-ring 3-D multi-cylinders to moving scatterers near far stationary scatterers,...

In this paper,we concentrate on the design, implementation and performance evaluation of medium access control (MAC) for multi-hop sensor networks. Being operated in unlicensed bands, battery-operated nodes need to sense available spectrum consume precious energy. Taking account cognitive radio as well traditional characters wireless networks, we design a MAC protocol network (CRSN) that supplies schemes solution. We propose cluster-based (KoN-MAC) which allows dynamically select an...

In this study, the authors consider a decode-and-forward (DF) relaying protocol with full-duplex wireless information and power transfer, investigate its outage performance. protocol, cooperative relay can transmit to destination harvest energy from source simultaneously. Thus, part of used by be recycled through self-loop channel that exists in relay's operation. An approximated expression for probability is derived under scenario where fading, then derive an exact closed-form non-fading....

In this letter, we investigate the joint power control and time allocation scheme in a wireless powered communication network, which sensors harvest energy then transmit information with switching protocol. Unlike time-division-multiple-access scheme, protocol allows signal simultaneously. Our purpose is to maximize sum of user-centric efficiency (EE) system. However, due coupled power, EE optimization problem non-convex, difficult be solved directly. We propose an iterative resource...

Most existing resource management problem models arise from the original desire of allocating resources in either a user-centric or network-centric manner. The difference between their objectives is obvious: methods attempt to optimize utility individual users, whereas intend collective utilities entire network. In this paper, above two aspects, we analyze robust power control device-to-device (D2D) communication underlaying cellular networks, where types channel uncertainty set (e.g.,...

A theoretical 3-D wideband model based on the dynamic evolution of scatterers for high altitude platform multiple-input multiple-output channel is proposed. In this letter, we consider properties that could re-appear after they have vanished, and an M-step, two-state Markov process used to scatterers. The Chapman-Kolmogorov equations are derive survival probabilities complexity reduced by using eigenvalue decomposition. spacetime-frequency correlation function derived, numerical results show...

MIMO-OFDM is one of the promising scheme for achieving high data rate and large system capacity over wireless networks. In this paper, we investigate blind channel estimation in systems based on noise subspace method. We exploit cyclostationarity induced by OFDM with cyclic prefix. The sufficient identifiability conditions were established, algorithm was developed estimation. only requires knowledge upper bound length, it does not impose restrictions zeros exhibits low sensitivity to...

Network coding is becoming more and popular in recent years for its ability to improve network throughput robustness. In this paper, we investigate physical-layer wireless networks propose a joint physical (PNC) channel implementation scheme multiple-access channel, which makes use of additive nature simultaneously arriving electromagnetic wave. Similar decoding single the proposed takes advantage linearity Turbo code directly estimate network-coding codeword, thus easier implement....

This paper studies the linear transceiver design for multi-stream multiple-input-multiple-output (MIMO) interference channels with imperfect channel state information (CSI). Two CSI error models are considered. The same coding and modulation scheme is assumed all users data streams. In first model, where statistical, we minimize average maximum per-stream mean square (MSE). second norm bounded, worst-case MSE optimized. Since problems not jointly convex, alternate optimization approach...

The multiple-input–multiple-output (MIMO) radio-frequency (RF) identification system applies the RF backscattering principle, and its physical channel exhibits a special kind of cascaded structure different from conventional wireless channels other (e.g., keyhole MIMO channel). In this paper, we provide general formulation to study orthogonal space–time block codes (OSTBCs) for with fading assumptions then analytically symbol-error-rate (SER) performances under Rician Nakagami- <formula...

We investigate joint relay selection (RS) and power allocation (PA) for full-duplex (FD) decode-and-forward (DF) co-operative networks, considering the scenario where available channel state information (CSI) is outdated, yet correlation coefficient between outdated CSI real one known. show that in environment, proposed scheme can provide a performance improvement over conventional schemes, if residual loop interference (RLI) sufficiently low, more gains be offered high signal-to-noise-ratio...