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In mobile Cognitive Radio Networks (CRNs), the frequent link breakage and wireless interference urged the need for novel stable routing solutions. In this paper, we propose STAR, a stable routing protocol that aims at selecting interference-free and durable paths. We investigate the particular Hidden interfering Primary User (HIPU) problem caused by the un-detectable presence of the primary user in...
In this paper we consider the broadband-narrowband coexistence scenario where the unused spectral gaps in the professional mobile radio (PMR) frequency band are used for broadband data communications. Spectrally confined filter bank based multicarrier (FBMC) waveform is applied for broadband transmission in order to minimize the interference leakage between the new broadband system and the legacy...
Increased demand for wireless services has spurred research into spectrum co-existence between radar and communication systems. The effect of an unaltered radar interference on an uncoded communication receiver has been investigated for constellations used in commercial systems. However, the constellation design — possible for a cognitive transmitter-receiver pair — that maximizes the transmission...
The main objective of this paper is to develop an efficient satellite digital beam-forming (BF) method that can provide user specific desirable signal-to-interference-plus-noise ratio (SINR) or data rate for each user in each zone. And a massive multiple-input multiple-output (MIMO) communications system model and its favorable channel propagation condition are assumed (i.e., channel independence...
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...
We propose a wireless power transfer (WPT) based underlay spectrum sharing scheme, where a primary user (PU) needs to harvest wireless energy from an access point (AP) and then transmit its data to AP using the harvested energy. In the same area, a secondary transmitter (ST) intends to communicate with a secondary receiver (SR). The secondary data can be transmitted along with the WPT, which can on...
This paper investigates a large-scale cognitive radio network with primary users (PUs) and secondary users (SUs) spatially and randomly distributed. All the PUs need to harvest wireless energy from their associated access points (APs) before transmitting information. To combat the low efficiency of wireless power transfer caused by the severe path-loss, we propose to apply an energy cooperation zone...
Modern multi-core systems employ shared memory architecture, entailing problems related to the main memory such as row-buffer conflicts, time-varying hot-spots across memory channels, and superfluous switches between reads and writes originating from different cores. There have been proposals to solve these problems by partitioning main memory across banks and/or channels such that a DRAM bank is...
Modern computer systems are accelerator-rich, equipped with many types of hardware accelerators to speed up computation. For example, graphics processing units (GPUs) are a type of accelerators that are widely employed to accelerate parallel workloads. In order to well utilize different accelerators to gain better execution time speedup or reduce total energy consumption, many scheduling algorithms...
In this paper, we investigate the hexagonal multicarrier faster-than-Nyquist (MFTN) signaling, which is considered to be a more promising technique than conventional rectangular MFTN in future communication systems. Specifically, different from previous works that mainly focused on the minimal Euclidean distance (or Mazo limit), we study the intersymbol interference (ISI) and/or intercarrier interference...
In this paper, the non-regenerative relay assisted non-orthogonal multiple access (NOMA) system is proposed to enlarge the cellular coverage area and to enhance the system performance. To investigate the proposed system's performance, the closed-form expressions in terms of the system capacity are derived. In an effort to evaluate the performance of the proposed system model, the comparison between...
The heterogeneous network concept in many respects meets customer requirements and maintains high energy efficiency. In this paper, we mainly investigate the impact of deployment efficiency of heterogeneous small cells BSs compared to the advantages of increasing the performance of wireless networks as a whole. We used well-known analytical models for calculating the values that can be obtained for...
To satisfy the requirement of increasing mobile traffic, heterogeneous networks (HetNets) will be deployed for the fifth generation (5G) mobile communications systems. Since the deployment of base stations (BSs) in HetNets is generally dense and random, stochastic geometry has increasingly been used to analyze the performance of HetNets. Most of the existing work is based on Poisson point processes...
The performance of massive multiple-input multiple-output (MIMO) systems is heavily affected by pilot contamination. This paper considers the problem of pilot contamination in massive MIMO systems, and investigates the normalized mean square error (NMSE) of the minimum mean square error (MMSE) channel estimation algorithm in the presence of pilot contamination. An effective uplink training strategy...
Due to the new characteristics of ultra-dense networks (UDN), such as high dense deployment of wireless access points (APs), complicated handover signaling processes and irregular coverage, how to achieve mobility support and reduce user's interrupt ratio remain a difficult problem. To address these issues, based on the presented user-centric APs clustering (UCC) network architecture in UDN, a UCC...
This paper concerns the uplink (UL) and downlink decoupled access in heterogeneous networks (HetNets) with multi-antenna base stations (BSs). Departure from the traditional minimum pathloss policy, a maximum UL signal-to-noise ratio (SNR) user association policy that takes account of multiple antennas at BSs is proposed. Based on the proposed association policy, the UL association probabilities and...
In the paper, we studied the solution of resource allocation problem with Coordinated Multi-Point(CoMP) in heterogeneous wireless networks. The utilization of CoMP technology enhances channel quality of users at the edge of cells, but it also brings more complexity to resource management of the network. To reduce this pressure, we exploited a feedback-based method to determine the allocation of users...
In this paper, we propose a modified clipping noise cancellation scheme using compressed sensing (CS) technique with observation interference mitigation for direct current biased optical (DCO) orthogonal frequency division multiplexing (OFDM) systems. The interference components in potential observations are theoretically analyzed and approximately estimated by exploiting the statistical model of...
In this paper, we consider a two-hop cooperative relaying network in a randomly distributed interference environment, where the source communicates with the destination, assisted by N decode-and-forward (DF) relays. We consider the interference-limited environments, where the received signals at the relays and the destination are degraded by random interference nodes distributed according to homogeneous...
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