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In this paper, we propose two uplink pilot power control schemes to mitigate pilot contamination in a multi-cell massive multiple-input multiple-output (MIMO) system. These uplink pilot power control schemes can maximize the minimum signal-to-interference-plus-noise ratio (SINR) of the worst user or the mean SINR of the whole network for the downlink data transmission. Combinatorial optimization problems...
Due to dense small cells deployment in a heterogeneous network, the backhaul links among the small cells and macro cell are band-limited when they share the same spectrum with the user equipments. To mitigate the intra- and inter-cell interference caused by the band-limited backhaul, we propose a recursive estimation-based zero-forcing beamforming (RE-ZFBF) scheme. Based on initial values obtained...
A problem that arises with pilot assignment in multicellular massive multiple-input-multiple-output (MIMO) systems is due to inter-cell interference, also known as pilot contamination. This paper focuses on minimizing the inter-cell interference that results from spatial correlation based on signal arrival parameters, assuming the use of a cylindrical antenna array. The signal parameters are used...
Service interruptions from mobility events, such as handovers and connection failures, are some of the major impairments for fulfilling the ultra-reliability requirements in fifth Generation (5G) mobile networks. One of the solutions to tackle the aforementioned challenges is multi-connectivity with Single Frequency Network (SFN) transmission, which refers to noncoherent joint transmission of a signal...
Many wireless networks operate in the presence of distance-dependent path–loss in a fading environment with a Poisson interference field. In these networks, the aggregate interference can be modeled as an α-stable process with a known characteristic function. In this study, the authors revisit performance analysis of wireless systems operating in a Nakagamim fading channel. In particular, our emphasis...
This paper investigates user selection and power allocation algorithms in multi-cell massive Multiple-Input Multiple-Output (MIMO) systems. The focus is on designing an algorithm that maximizes a particular cell of interest's sum rate taking into consideration the interference from other cells. This research extends previous work and proposes suboptimal per cell resource allocation models that are...
The challenges faced in the design of multiuser multiple-input multiple-output orthogonal frequency division multiplexing (MU-MIMO-OFDM) systems are the high peak-to-average power ratio (PAPR) in the transmitted signal and interference occured among the different users. Shaping the subcarriers in a proper way can reduce the PAPR of the OFDM signal effectively and minimize the interference among users...
In general, current wireless system, either for area networks or point-to-point links, cannot transmit and receive signals in both directions in the same frequency band and at the same time because of the extremely high self-interference, which annihilates the desired signal, making the use of half-duplex methods strictly necessary. In order to achieve full-duplex wireless communications, it is crucial...
With the advancing 5G technology of base stations mounted on aerial platforms, such as unmanned aerial vehicles, the issue of coverage area, capacity and inter-cell interference is assuming higher importance for the cellular networks. In this paper, we follow a deterministic approach to analyze these problems using the data obtained from a commercial software for wireless electromagnetic wave propagation...
Our work focuses on the per user distribution of achievable rate in a cellular environment. The system considered in this work consists of clustered base stations which systematize downlink transmission. Implementation of Block Diagonalization is carried outxwithinxthe clusterxfor the removal of interference within the users. The achievable ratexperxuser has a probability distributions which superlatively...
Channel assignment is a key problem in Cognitive Radio Networks. The channels are leased to the secondary users when the licensed or primary users are OFF, provided that the secondary users will leave those channels as soon as the primary users are reactivated. Therefore, to achieve a high performance of the network, we should lease a channel to a secondary user while both of them achieve the best...
The transmission capacity of WL-MANET (one kinds of wireless mobile local area network that consists of ad hoc nodes) is constrained by the mutual interference of concurrent transmissions among ad hoc nodes. We study a graph theory strategy and the impact to transmission capacity by the interference between the ad hoc nodes, and present methods for computing the transmission capacity for the given...
With the increasing development of industrial wireless technologies and standards, the scarce spectrum in the industrial, scientific, and medical (ISM) band has been extremely overcrowded, which can be mitigated by harvesting more spectrum in licensed bands with the emerging cognitive radio technology. In industrial cognitive radio networks (ICRNs), security is one of the most important problems....
When non second order circular (NSOC) signals are transmitted over time/frequency varying channels, classical linear equalization (LE) suffers from performance loss due to the signal's impropriety. For such signals, and signals corrupted by one single improper interference, it has been demonstrated that widely linear (WL) processing can enhance equalization performance. In this paper, we will study...
Caching at the edge is a promising technique to cope with the increasing data demand in wireless networks. This paper analyzes the performance of cellular networks consisting of a tier macro-cell wireless backhaul nodes overlaid with a tier of cache-aided small cells. We consider both static and dynamic association policies for content delivery to the user terminals and analyze their performance....
In this paper, we propose an analytical framework for energy saving and outage performance of two-tier heterogeneous networks with traffic-based varying inter-tier dependence. Firstly, the Macro Base Station (MBS) tier and Pico Base Station (PBS) tier are deployed following a Poisson Point Process (PPP) and a Poisson Hole Process (PHP) respectively. Then, the exclusion radius of the MBS is designed...
Heterogeneous Networks (HetNets) are being considered a promising way to significantly boost the overall spectral efficiency by using spectrum-sharing scheme to deploy femto base stations (FBSs) within a macrocell network. However, the co-channel deployment also brings a severe problem of interference containing intra-tier interference among FBSs and inter-tier interference between FBSs and the macro...
In this paper, we investigate both the reliable and secure transmission for device-to-device (D2D) communications underlaying cellular networks where eavesdroppers are according to the Poisson point process (PPP) distribution. The transmission secrecy outage probability (TSOP) is proposed to comprehensively characterize the joint performance of the reliability and the security. Firstly their connection...
In this paper, we use dual-hop relaying to overcome the signal blockage problem that occurs for millimeter waves (mmWaves) due to obstacles located in the propagation environment. Using device-to-device communication, a device in the neighborhood of the transmitter and the receiver can play the role of a relay by amplifying the signal from the source device and forwarding it to the destination device...
One of the key ingredients of Intelligent Transportation Systems (ITS) is delivery of broadcast status messages among vehicles for safety purposes. This requires an efficient Medium Access Control (MAC) that provides low average delay and high reliability. To this end, Carrier Sense Multiple Access (CSMA) has been commonly proposed for Vehicle Ad Hoc Networks (VANETs). Nevertheless, the hidden- node...
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