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In dense deployment area of femtocell networks, interference becomes major problem normally decreasing signal to interference plus noise ratio (SINR) of connection between Femto User Equipment (FUE) and Femto Base Station (FBS). Thus, FUE must select appropriate FBS to get high SINR value in order for achieving high data rates. In this paper, we investigate cell selection process in Femtocell networks...
Maintaining both reliable and secret communication involves different objectives: ensuring sufficient throughput for reliable communication and ensuring the secrecy of the associated communication. The optimal solution for one of these objectives might not be optimal or even suitable for another objective and thus a question arises as to what is the appropriate criteria for fairly balancing these...
Hierarchical cooperation schemes in wireless networks rely on local cooperation among neighboring nodes to create virtual multiple-input multiple-output (MIMO) connections between clusters of nodes. It was shown that, by applying the virtual MIMO technique recursively in a hierarchical manner, the sum rate of all source-destination pairs can scale linearly with the number of nodes in the network....
Enabling ultra fast systems has been widely investigated during recent decades. Although polarization has been deployed from the beginning in satellite communications, nowadays it is being exploited to increase the throughput of satellite links. More precisely, the application of diversity techniques to the polarization domain may provide reliable, robust, and fast satellite communications. Better...
The throughput of a conventional rate-compatible code based hybrid automatic repeat request (HARQ) protocol is lower-bounded by the rate of the mother code used. The mother code rate along with the highest puncture rate determine the operation range of the protocol in terms of the average received signal-to-noise ratio (SNR). In this paper, we propose a new HARQ protocol based on rate-compatible punctured...
This paper proposes and compares different policies to perform the optimal link selection in the presence of buffer-aided relay for multicast communications. These policies are based on the knowledge of the instantaneous link quality indicators as well as the status of the relay buffer, and dynamically select the more suited link according to a deterministic or random criterion, whose parameters are...
In this paper, we present a power allocation technique that improves the sum rate and energy efficiency without reducing the minimum data rate of an established resource block allocation technique. To achieve this, the technique is implemented in two stages where the first is for ensuring that the minimum data rate remains unchanged. The second stage is for increasing the sum rate by ensuring that...
Admission control is a fundamental mechanism used for Quality of Service (QoS) provisioning by restricting the access to the network resources. In this paper, we consider the application of superposition coding to increase the system capacity through multiuser diversity exploitation. We propose a joint great fairness admission control and superposition coding scheme to provide a good tradeoff between...
Adaptive modulation and coding (AMC), power control (PC) and automatic repeat request protocols (ARQ) represent very important link adaptation (LA) techniques for future generations of wireless communication systems. In order to improve the efficiency of these systems, some combination schemes of these LA techniques have been proposed in the literature. Most of these schemes were interested in the...
This paper analyzes the outage probability, energy efficiency, energy efficiency-spectral efficiency trade-off, through-put performance, energy efficiency-throughput gain trade-off and derives the optimal transmission power of Single-hop, Multi-hop, Decode-and-Forward (DF) and Incremental Decode-and-Forward (IDF) schemes in order to find out what extent collaborative communication can save energy...
In this paper, we investigate a user-centric Coordinated Multiple Point (CoMP) transmission scheme to improve Energy Efficiency (EE) in dense Heterogeneous Network (HetNet), which takes advantage of both Dynamic Point Reduced Power (DPRP) and Joint Transmission (JT). DPRP with a user voting method rather than Dynamic Point Blanking (DPB) is introduced to fully use the power while reducing energy consumption...
A new cooperative spectrum sensing method for non-time-slotted full duplex cognitive radio networks (FD-CRNs) is proposed in this paper, with the self-interference channel considered as Nakagami-m fading channel, which is more practical compared with commonly used Rayleigh and Rice channel. Closed-form expressions of the probabilities of false alarm and detection are provided in this paper for non-time-slotted...
This paper investigates the performance of cooperative relay networks in the presence of hybrid automatic repeat request (ARQ) with delay constraint. It analyzes the scenarios where the relay channels are asymmetric (i.e., the links of the wireless relay network follow different fading distributions) due to relaying position and/or due to time varying channel fading. The analytical expressions for...
Massive MIMO with small-cells are attracting much attention as a promising scenario for 5G. In those deployment scenarios, it is considered that base stations (BSs) are located at heights below 10 m such as on a lamppost or an exterior wall of a building's second floor. However, the throughput performance in such scenarios has not been sufficiently evaluated yet, since the current widely used channel...
Coordinated Multi-Point (CoMP) transmission aims to improve the quality of service of User Equipments (UEs) at cell-edge. To achieve this, some Joint-Processing (JP) CoMP categories use more spectrum resources and thus reduce the spectrum resource for non-CoMP UEs. From the point of view of user experience, it is inappropriate that UEs which cannot benefit from CoMP or legacy UEs are penalized (by...
Compared to current mobile networks, next-generation mobile networks are expected to support higher numbers of simultaneously connected devices and to achieve higher system spectrum efficiency and lower power consumption. To achieve these goals, we study the multi-sharing device-to-device (D2D) communication, which allows any cellular user equipment to share its radio resource with multiple D2D devices...
In this paper, a joint control method for the user association and almost blank sub-frame (ABSF) based interference coordination (IC) technique in heterogeneous cellular networks is proposed. The optimization objective is simultaneously improving system throughput and guaranteeing proportionally fairness. Usually, user and base station (UE-BS) association is performed before ABSF rate determination,...
One of the ways to harness the radio bands that are not used by their primary owners, is to allow opportunistic use of the bands to be used by secondary users such that they do not interfere with the primary users. Most often, multiple secondary users contend to acquire the bands that are available. Proper scheduling techniques can resolve such contentions. However, all scheduling techniques have...
Relay technique is introduced in the Long Term Evolution Advanced (LTE-Advanced) system to extend the network coverage, improve the performance of cell-edge user equipments (UEs) and increase the fairness among different UEs. The combination of multiple-input-multiple-output (MIMO) and relay can further increase frequency efficiency and improve system performance. In this paper, based on the architecture...
This paper considers an underlay access strategy for coexisting wireless networks where the secondary system utilizes the primary spectrum to serve its users. We focus on the practical cases where there is uncertainty in the estimation of channel state information (CSI). Here the throughput performance of each system is limited by the interference imposed by the other, resulting in conflicting objectives...
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