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In this paper, a novel joint decision-feedback equalizer (DFE) with progressive group detection (PGD) assistance is proposed for downlink MIMO spatial multiplexing systems under frequency-selective fading channels. The proposed DFE operates on chip-level to accommodate CDMA wideband systems employing short and long scrambling codes over frequency-selective channels. PGD is a near-maximum likelihood...
This paper considers the spectrum sharing multiple-input multiple-output (MIMO) cognitive radio network, in which single primary user (PU) coexists with multiple secondary users (SUs). Instead of solving the single-objective optimization prob-lem, we strive to jointly maximizes the number of served SUs and enhances the transmit rate of secondary links with the transmit power and interference temperature...
Integration of wideband joint spatio-temporal spectrum sensing in wireless cellular system (coherent and non-coherent variant) is proposed as preliminary innovative idea. It provides that cellular systems as licensed users should use unoccupied licensed frequency bands assigned to other licensed users. Such cognitive properties integrated in cellular systems should improve their performances both...
This paper proposes a distributive interference management for OFDMA-based hierarchical macro/femto-cell networks. Specifically, the joint resource block (RB) and power allocation of the downlink case is modeled by the potential game (PG) approach, which is proved to exhibit pure and unique Nash Equilibrium (NE). In the designed PG, the femto base stations (HBSs) are the players, and the RB and power...
This paper considers a cognitive radio network where multiple secondary users (SUs) sharing multiple channels with the primary user (PU). The SUs are assumed to carry delay-sensitive services, thus the concept of effective capacity, which is defined as the maximum supported constant arrival rate under the delay quality of service (QoS) constraint, is adopted. Beside the delay QoS constraint, the interference...
This paper presents the singular value decomposition (SVD) based codebook design criteria to accurately recover the channel of the users. Therefore, these codebooks make possible to utilize the interference reduction aided preprocessing techniques for practical purpose as in the HetNet environment. The system-level simulations verify that the proposed SVD based codebooks recover more accurate channel...
This paper investigates the problem of joint user association and resource allocation in a downlink cognitive radio (CR) network. In the CR network, multiple cognitive base stations (CBSs) and multiple secondary users (SUs) are considered to share multiple channels with the primary user (PU) under the condition that the interference from the CR network to the PU is restricted. Exclusive user association,...
One fundamental issue in supporting multi-cell ultrahigh throughput wireless local area networks (WLAN) is how to coordinate inter-cell interference. In this paper, we present a novel max-min fair resource allocation scheme to increase system capacity and improve the communication quality of cell-edge users. We assume the users within one cell operate on orthogonal frequency channels, while users...
The main applications where parallel robots are used remain until today very limited. The best known examples include flight simulators, large vibrating tables for seismic tests, pointing systems of antennas and telescopes mirrors. Common to all these robotic devices are: (1) high accuracy, (2) high velocities and accelerations, and (3) high loading capabilities: the robot itself becomes the supporting...
This paper studies downlink coordinated beamforming schemes with overlapped clusters, where a base station (BS) may belong to multiple clusters selected by different users. Subject to the inherent constraint on information sharing for overlapped clusters, i.e., the information of a user is shared only within the user's coordinating cluster, we propose two decentralized coordinated beamforming schemes,...
Electromagnetic interferences between an existing gas pipeline and a newly designed high voltage power line sharing the same right-of-way, are evaluated. Induced voltages are computed for different steady state power line operating conditions, using dedicated professional software. To increase results accuracy, soil resistivity measurements were made along distribution corridor length and the appropriate...
Device-to-device (D2D) communication is a promising technique for improving the spectral efficiency of cellular networks. In this paper, we consider joint optimization of pair assignment and power control for D2D pairs reusing downlink cellular resources, and aim to maximize the aggregate rate of D2D communications while guaranteeing the quality of service (QoS) of the cellular users. By transforming...
Heterogeneous Network (HetNet) is a promising solution to enhance network capacity and extend network coverage by increasing cell site density in Long Term Evolution-Advanced (LTE-Advanced) systems. However, dense deployment of cell sites not only increases desired signal strength, but also intercell interference as cell sites get closer. To combat with intercell interference, Joint Processing Coordinated...
The problem of resource allocation in two-way relay network is considered in this paper. The cognitive radio (CR) context is tackled where a amplify and forward (AF) OFDM-based dual-hop multiple relay system is investigated. The joint allocation of subcarrier pairing, relay selection and power allocation is performed under both interference and individual power constraints where the target is to maximize...
We propose to use Han-Kobayashi (HK) coding and dirty-paper coding (DPC) to cope with inter-carrier interference (ICI) in dual-carrier transmissions. We show the considerable benefit of those methods to increase throughput in presence of strong ICI for dense carrier spacing.
Heterogeneous Networks (HetNets) are seen as an effective solution for improving network capacity, offloading traffic and optimizing coverage. However, the transmit power difference between the introduced low power nodes and the legacy macro cells essentially leads to two challenges: Cell Association and Inter-cell interference management. The above issues can be mitigated through the enhanced Inter...
In this paper, we consider a multiuser cognitive radio (CR) transmission where the users transmit and receive information with the help of a two-way half duplex cognitive relay node. The problem of power allocation, user assignment, and the transmission mode selection is investigated in underlay transmission scheme such that the secondary and the primary networks share the spectrum simultaneously...
We examine small cell deployment strategies in two- tier cellular networks. Specifically, we propose a joint interference and load deployment (JD) strategy, reflecting a realistic interference environment and traffic load. In this JD, the location of a small base station (s-BS) is sequentially decided in greedy manner by exploiting both the spatial user equipment (UE) distribution and the received...
In the wireless mobile communication system, the performance of system throughput is seriously affected by the interference, which can be divided into intra-cell and inter-cell interference. Intra-cell interference could be refrained by orthogonal frequency-division multiple-access (OFDMA). Coordinated multipoint (CoMP) transmission is an effect way to decrease inter-cell interference. A CIWF algorithm...
This study investigates the joint resource block (RB) and power allocation in self-organized femtocell networks. Specifically, the concern here is to maximize the energy efficiency while minimizing the impact of interference in the network. The energy efficiency criterion that is incorporated in this study includes the transmission power and the circuit power. The joint allocation task is modeled...
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