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In this paper, we propose a power control algorithm dedicated for machine type communications (MTC) in future non-orthogonal multiple access (NOMA) networks employing game theory. In MTC networks, communication reliability should be considered prior to power consumption or energy efficiency. Once the reliability is satisfied, discussions about power consumption makes sense. We build a cost function...
In a device to device (D2D) communication underlaying cellular network, total system sum rate can be improved if cellular user equipments (UEs) and D2D pairs share resource blocks (RBs). We consider such an optimization problem where the objective is to maximize the total sum rate of the system while sharing RBs among cellular UEs and D2D pairs and maintaining some quality of service (QoS) requirements...
We propose a user selection algorithm for the downlink multi-user millimeter wave systems. Our design aims to classify favorable users in terms of the achievable rate based on the channel state information. The phased-zero-forcing scheme is introduced to find the analog precoder gain easily under the multi-user environment. In order to maximize the overall sum-rate of selected users, we then establish...
Frequency and magnitude evaluation are two of the main signal analysis tasks in the electrical power systems. This paper presents a simple and robust algorithm which enables an accurate estimation of the harmonic parameters of signals with unknown frequency. Differing from the existing approaches, frequency and magnitude of harmonic waves are simultaneously and precisely identified. The proposed algorithm...
In this paper various adaptive filters have been thoroughly applied to biomedical data processing in the aim to implement a barrier between noise reduction and preservation of the useful information. Electrocardiography (ECG) presents one of the most important indicators, which can be informed of the recognizing approaches to discover heart disease. Due to its inherent importance, it is interesting...
Determining the centroids of circular marks is a problem that arises in many applications, for example, fluid mechanics, computer graphics, coordinate meteorology, statistics, etc. The accuracy of determining the centroids of circular marks in images is important for the overall accuracy of measurements. Therefore, the aim of the present work is to determine the centroids of these circular marks with...
Energy-efficient design has emerged as a promising technique in heterogeneous networks. We study the energy efficiency problem of joint user association and power allocation in a two-tier heterogeneous network with small cells. The energy efficiency is maximized under certain prescribed quality-of-service requirement and maximum power limit constraint. The original optimization problem is a nonconvex...
Error control coding scheme improves adequate redundancy in communication system. Turbo Code (TC) and its elevated form like 3-Dimensional Turbo Code (3D-TC) are considered as important channel coding scheme, which tend to Shannon limit. In the meantime, substantial development in the field of intelligent computational technique has motivated the researchers to apply this algorithm in various engineering...
In this paper, we investigate the fundamental energy- efficient power allocation problem in spectrum-sharing wireless networks. We introduce an energy-rate tradeoff index (EI) to characterize how efficiently the energy is consumed and formulate an optimization problem to maximize the EI subject to the power budget constraints. We first show that the EI maximization problem is intimately connected...
Advances in millimeter-wave (mmW) communication open up a vast frequency band, from 30 - 300 GHz, for use in mobile communication systems. However, these new frequencies exhibit highly variable and intermittent channel characteristics. In this work, we investigate the impact of diverse mmW channel statistics on the limit and the rate at which the achievable rates converge to the infinite bandwidth...
A cloud radio access network (Cloud-RAN) is a network architecture that holds onto the promise of meeting the explosive growth of mobile data traffic. Cloud-RAN consists a central processor (CP) connecting to multiple multi-antenna base stations (BSs) via finite-capacity backhaul links. To reduce the backhaul traffic, BS-level caching technique is utilized in which the popular contents are pre-fetched...
Modern mobile terminals produce massive small data packets. For these short-length packets, it is inefficient to follow the current multiple access schemes to allocate transmission resources due to heavy signaling overhead. We propose a many-access scheme that is well suited for the future communication systems equipped with many receive antennas. The system is modeled as having a block-sparsity pattern...
In this paper, a joint linear pre-coder and combiner optimization scheme is proposed to reduce the multi- user interference in the distributed antenna system (DAS). The pre-coder is designed based on the modified weighted signal-to-caused interference ratio (SCIR) which considers the interference on others caused by the desired user and the users channel condition. And the combiner is chosen based...
In this paper, an adaptive nonlinear decision feedback equalizer(DFE) is designed using three blocks that is feed forward filter, feedback filter and single layer neural network architecture with functional expansions of input patterns. Fast Block Least Mean Square (FBLMS) is used to update coefficients of all filters used in the design and the algorithm is based on block processing using FFT and...
The interference suppression capability of phased array depends on efficacy of adaptive algorithm employed for pattern synthesis. In this paper, the active cancellation of probing sources in dipole array mounted on planar/non-planar conducting surfaces is demonstrated. The optimum antenna weights are obtained using modified improved LMS algorithm. The platform effect and mutual coupling are taken...
In this paper, we address the use of order statistics to detect the presence of a wireless network for cognitive radio applications. The basic principle of the proposed scheme is generic. However, Long Term Evolution (LTE) is used as the reference system to demonstrate its application and analysis. Our proposed scheme is a coarse spectrum sensing technique that requires no prior knowledge of the exact...
A novel algorithm is proposed for frequency estimation of a single complex exponential signal or a real sinusoid signal in additive white Gaussian noise (AWGN). The proposed algorithm consists of a coarse search and a fine search, where the coarse search can be accomplished by maximum likelihood (ML) estimation, while the fine search performs a frequency interpolation via time-domain zero padding...
Consensus-based algorithms are a welcome approach to establish cooperative communication systems. In this work, it has been utilized to present a hardware architecture for distributed data detection in a receiver with several sensor nodes on an easily scalable regular network. Additionally, it is capable to detect the transmitted message even if a single sensor node fails to operate. On top of that,...
A novel efficient blind estimation method is proposed for long-code direct sequences spread spectrum signals. The core idea of the proposed method is to construct an information symbol transition pattern matrix to eliminate the information symbol time varying damage to the periodic structure of pseudo-noise sequences for long-code DSSS signals. Then eigenanalysis approach is employed to estimate the...
As the explosive growth of wireless date requirements, heterogeneous network (HetNet) has become an effective solution for improving the system performance such as the throughput. The femtocells are always arranged to share the spectrum with the macro base stations (MBSs). Thus, the co-channel interference leads to the degradation of the HetNet throughput. In this paper, we discuss the program of...
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