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One of the major challenge for practical Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM)system is the accurate channel estimation which is very essential to guarantee the system performance. In this paper, the Subspace Pursuit (SP), Orthogonal Matching Pursuit (OMP) and Compressed Sampling Matching Pursuit(CoSaMP) techniques combined with Minimum Mean Square Error(MMSE) and...
Relay selection among available relays is crucial in improving the performance of cooperative relaying. In this paper, we address the relay selection for a multi-relay decode-and-forward (DF) cooperative relaying scheme over channels impaired by bursty impulsive noise in the presence of Rayleigh fading. For this scheme, we propose a novel best relay selection technique which is based on both the channel...
UHF EPC Gen2 RFID systems use Dynamic Frame Slotted ALOHA (DFSA) to manage reading of multiple RFID tags. In DFSA, the reader may receive short address messages (RN16) from one or more tags at any given timeslot. To enable RFID readers to read a significantly large population of tags within a small time interval, it is required to increase the underlying throughput by maximizing the percentage of...
This paper considers the optimal energy efficient association for HetNets by applying almost blank subframes (ABSs) techniques. Aiming at maximizing energy efficiency (EE) without the quality of service (QoS) constraints, we obtain a closed-form optimal solution, which indicates that the optimal choice of blank resource block (RB) fraction for EE maximization is binary without individual user QoS...
Channel state information (CSI) is critical for the performance of multicell cooperative transmission. This paper compares two cooperative multicell precoding methods, namely, centralized precoding with global CSI and distributed precoding with local individual CSI. For both cases, the BSs have access to the data of all the users. The only difference is that in centralized precoding, the precoding...
Ultra-dense network (UDN) is considered to be a promising solution to improve network throughput of future radio access networks. In this paper, we investigate the performance limits of ultra dense cloud access network under limited backhaul. Lower bounds of the average per-user rate are derived for linear reception without and with successive interference cancellation (SIC). Then we discuss how the...
The identification of academic attributes that allow improving student achievement is of fundamental importance in the teaching learning process. In the current study we present a methodology to recognize the attributes of educational success based Pareto distribution and data mining algorithms that authorize the identification of which attributes most important to child's educational performance...
A cooperative spectrum sensing (CSS) scheme with multiple malicious secondary users (MSUs) is considered. These MSUs carry out spectrum sensing data falsification (SSDF) attacks. An MSU suppression scheme is considered which consists of an improved energy detector (IED) followed by a statistical algorithm implemented at the fusion center. Three statistical algorithms are considered which are: the...
Cognitive radio networking coupled with spectrum sensing technology enables unlicensed secondary users (SUs) to opportunistically access the licensed spectrum of primary users (PUs). Cooperative spectrum sensing significantly improves the detection probability of primary user transmission. Nevertheless, current cooperative sensing techniques render shortcomings including energy consumption and overhead...
In this paper, the outage analysis of MultiHop MultiBranch(MH-MB) network with Kth best relay selection method using Amplify-and-forward protocol is discussed. In cooperative communication systems, we excogitated a MHMB system with Kth best relay selection to overcome the hurdles that are faced if the best deteriorates. In this article, we considered independent and identically distributed Rayleigh...
Phase adjusting and power adjusting input schemes of non-orthogonal Gaussian multiple access channels (GMAC) for two-user with finite input constellations have been studied. In this paper, the input scheme for multi-user is jointly optimized by both powers and phases. This scheme is deduced from the constellation constrained (CC) capacity of multi-user GMAC. Performance analysis indicates that the...
This paper presents a characteristic expression to determine the effective bandwidth of broadband wavefields observed over a source-free finite spherical region. To address this topic, for given constraints on size of the observation region and bandwidth, we characterize the observable wavefield using modal expansion of wave propagation in 3D. When signals are transmitted to a spatially constrained...
We investigate the optimal power and rate allocation for multilayer transmission using the broadcast approach over a fading amplify-and-forward relay channel. The source uses multilayer source coding with successive refinement where the layers are transmitted using superposition coding at the source with optimal rate and power allocation. The destination applies successive interference cancellation...
This paper is concerned with the optimal association of user equipments (UEs) to the base stations, which are either a macro base station or pico base stations, for the sum rate utility in a cooperative heterogeneous network (HetNet). This is a nonconvex combinatorial problem. By recasting the problem as a d.c (difference of convex (d.c.)) program, the optimal association solution is sought by d.c...
The problem of optimal likelihood based modulation classification (MC) for optimal detection in 2×2 multiuser MIMO (MU-MIMO) receivers is considered. The optimal Log-MAP classifier is computationally exhaustive, and its sub-optimal Max-Log-MAP version poses remarkable degradation in performance. Between these two extremes, we propose four computationally efficient methods for MC, by taking special...
The problem of estimating the complex amplitude of a signal which is known only to an unknown scaling factor with noise present is a well studied problem. Maximum likelihood (ML) and Capon estimates of the complex amplitude in the case where the noise vectors are circularly symmetric complex Gaussian with an unknown arbitrary covariance matrix have been proposed in previous literatures in closed form...
This paper presents two different approaches to derive the asymptotic distributions of the robust Adaptive Normalized Matched Filter (ANMF) under both H0 and H1 hypotheses. More precisely, the ANMF has originally been derived under the assumption of partially homogenous Gaussian noise, i.e. where the variance is different between the observation under test and the set of secondary data. We propose...
Cognitive radio (CR) tends to be the key technology of future wireless networks as it provides the mechanism of enabling the spectrum sensing awareness. The first stage in the cognitive radio duty cycle is spectrum sensing (SS) which is the most challenging stage as it requires an accurate real-time decision of the Primary User (PU) presence or absence in a certain band and allow the Secondary User...
The assumption of additive white Gaussian noise (AWGN) to model measurement is not valid since many applications such as in RF power measurement the noise is colored with 1/f spectrum characteristics. With this characteristics, the assumption of independently identically distribution (IID) used in signal detection and estimation becomes not valid. The autocorrelation function and power spectrum can...
In 5G wireless communication systems, steerable beamforming techniques will become one of the techniques that will draw high attention in telecommunication industries. The steerable beamforming technique not only provides high throughput, but also increases the capacity of the system. Furthermore, steerable beamforming techniques hold the potential to overcome the interference problem in dense deployment...
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