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Sparse code multiple access (SCMA) is a nonorthogonal multiple access scheme based on a multi-dimensional codebook with sparse codewords. The sparsity property of SCMA allows the receiver to take advantage of low-complexity message passing algorithm (MPA) detector with maximum likelihood (ML)-like performance. The use of multiple antennas at the SCMA receiver will improve the detection performance...
This paper provides a thorough analysis of the key aspects affecting the capacity of LTE networks. We group the analysis to the three major categories namely technology, spectrum and topology aspects. Through the extensive system-level simulations we investigate which of the specified aspects mostly affect the capacity and spectrum efficiency of 4G LTE networks. In addition, based on the performed...
Polar coding is a low-complexity method for communication over noisy classical channels, which is capable of providing highly reliable data transmission. This paper proposes an enhanced polar codec scheme for mission critical applications in train-to-ground wireless communications. Firstly, we develop an enhanced polar coding scheme to support reliable data transmission under time-varying channel...
There has been a considerable debate on the applicability of conventional encryption techniques for protecting images. Chaos based encryption systems are preferred for digital image encryption for a long time now. For a reliable encryption method any alteration in image content or the key must be reflected in the cipher image. The present work demonstrates a highly secure and reliable encryption of...
Combinatorial multi-armed bandit (MAB) problem can be used to formulate sequential decision problems with exploration-exploitation tradeoff. Dynamic spectrum access (DSA) in cognitive radio (CR) networks is one of important applications. In this work, we briefly overview combinatorial MAB problems with its possible applications to CR networks. We first investigate the standard MAB problems where a...
In this paper, we propose a novel pseudo-random beamforming (BF) technique in multi-cell downlink networks consisting of multiple base stations (BSs) and one BS coordinator. In the proposed technique, each BS first generates M BF matrices with a pseudo-random manner and each mobile station (MS) opportunistically feeds back the received signal-to-interference-and-noise (SINR) ratio for each random...
This paper is proposed to assess the rockfall susceptibility during thawing periods of South Korea by conducting the rockfall susceptibility assessment within a geographical information system (GIS) environment. In order to assess the influence of each triggering factor classes, frequency ratio analysis is applied by comparing the rockfall occurrence sites and triggering factors. According to the...
In this paper, we examine a joint user pairing and dynamic power allocation (JUPDPA) design to maximize the energy efficiency (EE) in the multicell multiple-input multiple-output (MIMO) — non-orthogonal multiple access (NOMA) downlink system. A novel JUPDPA scheme is proposed based on median and the euclidean norm of the channel vectors. In addition, base station dynamically allocates the transmission...
Massive connectivity is one of the major goals of 5G mobile communications. NB-IoT systems are emerging as a way to achieve this goal. In this paper, we analyze the interferences between the LTE system and the NB-IoT system when they coexist.
In this paper, a new cell selection technique is proposed for millimeter-wave (mm-wave) considering hybrid beamforming structure in data transmission stage. In order to reduce processing time for channel estimation, cell and beam synchronization signals (CBSS) are proposed which are simultaneously transmitted from multiple beams. It is shown by simulation that the proposed technique with the CBSS...
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