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Recently an extensive deployment of small cell Networks (SCNs) called two tier-heterogeneous networks have been proposed, especially for dense urban zone. Therefore, Macro Cell Networks containing a hyper density of SCNs distributed randomly within it will emerge the field. The benefits of two tier Heterogeneous Networks (HetNets) are realized through the traffic flooding via small cells. To enhance...
Ultra-reliable and low latency communications is envisioned to enable new services and applications with high reliability, availability and low latency, e.g, factory automation, Tactile Internet. Device-to-device communication is one such mean that allows devices to experience benefits in terms of shorter communication latency. Currently most device-to-device communication in frequency-division duplex...
Future mobile networks are known to deploy a two-tier architecture of macrocell — femtocell [1]. In the two-tier architecture, femtocell downlink channels can cause strong co-channel interference to downlink transmission of macrocell users (MUs) which use the same frequency. The co-channel downlink interference to the MU might cause the MU's QoS degradation. To maintain the QoS of the MU's connection,...
This paper propose a method of suppressing inter-user interference in the in-band full duplex communication. In this method, an interference compress technique is used for eliminating the interference at the receiving terminal. Also, we evaluated the achievable transmission rate of the proposed method by using channel state information (CSI) measured by the outdoor field experiment.
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...
In this paper, we propose a novel m-th best average biased received power (ABRP) user association (UA) scheme for K-tier heterogeneous networks (HetNets), where a user is associated with the base station (BS) having the m-th strongest ABRP. For this novel scheme, by using stochastic geometry and modeling the positions of network elements in each tier as a homogeneous Poisson point process (PPP), we...
Cumulative distribution function (CDF)-based scheduling (CS) has been known as an efficient technique for cellular networks, which satisfies arbitrary channel access ratio requirements of users in a cell, while efficiently exploiting multiuser diversity (MUD). In this paper, we mathematically analyze both throughput and energy efficiency (EE) of CS in a multi-cell downlink network where the users...
Non-Orthogonal Multiple Access (NOMA) is a promising multiple access technique for 5G wireless communication networks due to its higher spectral efficiency and user fairness. Power allocation is the key to improve the performance of NOMA systems. In this paper, we focus on a certain NOMA group of a hybrid NOMA system. We formulate a sum-throughput maximization problem for uplink under the constraints...
Hybrid precoding provides a compromise between the system performance and the implementation complexity in millimeter wave (mmWave) systems, while cloud radio access network (C-RAN) is a green network composed of central baseband unit (BBU), distributed low-cost remote radio heads (RRHs) and low-latency fronthaul links connecting BBU and RRHs. This paper jointly optimizes the user scheduling and hybrid...
Citizen Broadband Radio Service band (3550–3700 GHz) is seen as one of the key frequency bands to enable improvements in the performance of wireless broadband and cellular systems. A careful study of interference caused by a secondary cellular communication system coexisting with an incumbent naval radar is required to establish a pragmatic protection distance, which not only protects the incumbent...
This paper provides a methodology to study the PHY layer vulnerability of wireless protocols in hostile radio environments. Our approach is based on testing the vulnerabilities of a system by analyzing the individual subsystems. By targeting an individual subsystem or a combination of subsystems at a time, we can infer the weakest part and revise it to improve the overall system performance. We apply...
This paper addresses the robust beamforming design for a downlink cloud radio access network (cloud RAN) subject to per-base-station (BS) power constraint and individual signal-to-interference-plus-noise ratio (SINR) requirements. Our objective is to minimize the overall network power and backhaul cost while guaranteeing the users' SINR constraints for every channel realization by designing the joint...
In this work, we propose a mobility management optimization framework for the networks employing full-frequency reuse. The mobility management issue is considered in the context of two main self-organizing networks (SON) functionalities, i.e mobility load balancing (MLB) and mobility robustness optimization (MRO) as a user-to-BS assigment problem. A central optimization method, which aims to maximize...
In this paper, we design a fully non-orthogonal communication framework for spectral-efficient massive access. Firstly, we propose a non-orthogonal channel estimation (NOCE) method, which can achieve a balance between channel state information (CSI) accuracy and the length of pilot sequence. Then, we present a massive multiple-input multiple-out (MIMO) non-orthogonal multiple access (NOMA) scheme...
Data and energy integrated communication networks (DEINs) have emerged for simultaneously realising both of wireless energy transfer and wireless data transfer by exploiting radio-frequency signals. A heterogeneous DEIN is studied, which consists of both indoor and outdoor user equipments (UEs). In order to characterise the diverse data and energy requirements of UEs, a utility function is defined...
This paper proposes a duplex mode selection strategy in a full-duplex (FD) self-organized small cell network. We aim to maximize the sum rate of small cell base stations (SBSs) subject to the quality of service (QoS) of the macro users (MUEs) and the small cell users (SUEs). For this formulated problem, two stages for this selection is considered: user pairing and channel allocation. In the first...
In this paper, we propose an angle domain sparse code multiple access (ASCMA) scheme for the massive multiple-input multiple-output (MIMO) networks to enhance the access connectivity. The basic idea of ASCMA scheme is to construct a non-orthogonal transmission policy in the sparse angle domain channel of massive MIMO networks. Firstly, an angle domain mapping structure is presented, where both the...
In this paper, we propose novel user clustering schemes for downlink non-orthogonal multiple access (NOMA) system, where an N-antenna base station (BS) selects and serves 2N users from K single antenna user equipments (UEs) (K ≥ 2N and K is even). In particular, we propose a signal difference and alignment (SDA) framework to achieve fair and spectral efficient user clustering for NOMA with flexible...
The transmitted power of the very first message of access procedure to a 5G network is a relationship of initial power, offset, step power, and a number of re-transmissions. In the current networks, the access procedure is the same, whether or not there is external interference. A high external interference provide a higher probability to have access delay or fail. To mitigate this, the access procedure...
This paper provides an tractable analysis of the downlink spectral efficiency of multi-cell multi-user distributed antenna systems (DASs) using stochastic geometry with maximal ratio transmission (MRT) and zero-forcing (ZF) beamforming. Firstly, based on the properties of Gamma variable, the distributions of signal and interference power can be obtained. Then by modeling remote antenna units (RAUs)...
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