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In social commerce services, if the purchase condition for the minimum number of ordered users is satisfied, customers can get a great deal of discount for the corresponding products. The convergence of D2D communications and the social commerce services may create a synergistic effect because the D2D user can spontaneously relay the advertisement messages to their neighbors. Accordingly, we here...
Next-generation wireless communications systems are expected to exploit frequency bands above 6 GHz. An important transition towards such bands will be design of channel models capable of supporting the design of efficient air-interface and networks. In this paper, we describe a geometry-based statistical channel model and apply ray-tracing simulation for its validation. Focusing on path loss and...
Integration of new radio technologies to legacy ones has always been an important feature in any wireless communication generation shift and it is envisioned that for the transition to 5G this will be even more critical. Different 5G research projects have acknowledged the demand for a new air interface that will be designed to operate in higher frequency bands (compared to the ones currently allocated...
Proportional fair schedulers have been thoroughly used in LTE due to their ability to provide a good trade-off between cell spectral efficiency and user fairness. Current algorithms provide suboptimum solutions at a low computational cost, but present several drawbacks. This paper proposes a CMA-PFS for LTE downlink that increases efficiency as compared with current algorithms with independent time...
Very large multiple input multiple output (MIMO) system (referred to as massive MIMO) is currently investigated as a novel technology to enhance system throughput for future cellular systems. In this paper, we study a practical implementation of massive MIMO technology in LTE-Advanced systems. Firstly, two three dimensional(3D) dynamic beamforming schemes are proposed to realize full spatial resolution...
Non-orthogonal multiple access (NOMA) is one of the promising radio access techniques for further cellular enhancements toward 5G. Compared to orthogonal multiple access (OMA) such as orthogonal frequency-division multiple access (OFDMA), large performance gains were confirmed via system-level simulations. However, NOMA link-level simulations and the design of the receiver remain of great importance...
Internet of Things (IoT) interconnects resource constrained devices for providing smart applications to citizens. These devices have to be able to ensure both a minimum Quality of Service (QoS) and a minimum level of security when gathering and transmitting data. Compressive Sensing (CS) is a relatively new theory that performs simultaneous lightweight compression and encryption and can be used to...
Distributed storage solutions have become widespread due to their ability to store large amounts of data reliably across a network of unreliable nodes, by employing repair mechanisms to prevent data loss. Conventional systems rely on static designs with a central control entity to oversee and control the repair process. Given the large costs for maintaining and cooling large data centers, our work...
In this paper, we investigate receiver techniques for nonlinear high power amplifier distortion compensation in Orthogonal Frequency Division Multiplexing (OFDM) systems. We introduce a new method for the detection of the nonlinearly distorted symbols received by the OFDM transmission system receiver. The proposed approach allows the determination of the position of the symbol in error and based on...
Abstract-Universal-filtered multi-carrier (UFMC) technique is considered as a potential candidate for future communication systems due to its robustness against inter-carrier interference (ICI), suitability for non-contiguous fragmented available spectrum resources and low latency scenario in 5G network. In this work, we present a novel pulse shaping approach in UFMC to reduce the spectral leakage...
Finite rate feedback model based on Random Vector Quantization (RVQ) is efficient in terms of number of feedback bits. However, the required scaling of feedback bits (codebook size) to achieve full multiplexing gain becomes extremely large with high Signal-to-Noise Ratio (SNR) and might not be practical. This paper considers the use of a Random Element Quantization (REQ) approach, which quantizes...
In this paper, we consider the problem of uplink coordinated multi-point (UL CoMP) in a wireless network with non-ideal backhaul links. UL CoMP with joint receivers has the potential to improve both cell-edge and system capacity depending on the deployment environment. Realizing the performance gains from CoMP requires ideally large bandwidth and low latency backhaul links to do data exchange. Even...
Abstract-Dynamic configuring of uplink and downlink switching point in time division duplex (TDD) systems is considered a promising solution to cope with the traffic variations caused by the burstiness of mobile broadband data. However, such dynamic TDD (D-TDD) requires fast inter-cell coordination which may be difficult to implement in ultra-densely deployed networks (UDNs). In order to explore the...
Coverage probability is a key performance indicator for both broadcast and cellular networks, but it is calculated and thus defined in different ways between the two. In this paper, the two definitions are compared and the assumptions for which they are equal are derived. Then the conventional broadcast methodology for calculating the coverage probability is improved by replacing the assumption of...
Heterogeneous Networks (HetNets) have been a crucial point in the evolution of mobile networks that boost the network performance with the addition of small cells. The use of Enhanced ICIC (eICIC) techniques such as Almost Blank Subframes (ABS) has been introduced in HetNets to protect the small cells from high interferences. However this is done at the expense of lower macrocell user capacities....
The GeoNetworking protocol provides single-hop and multi-hop communication in vehicular ad hoc networks based on IEEE 802.11p/ITS-G5. It has been standardized by the ETSI Technical Committee ITS as part of its Release 1 set of specifications and is expected to be deployed in the next years. This paper presents a performance evaluation of the GeoNetworking protocol in its recently published version...
A neighbourhood area network (NAN) connects all the end users with energy suppliers and/or distributed generation. In this paper, we propose an IEEE 802.11af based NAN for Smart Grid applications in Low Voltage electricity networks and analyze its packet delivery and delay performance against the Smart Grid requirements. The IEEE 802.11af is implemented in ns3 and its performance for carrying Smart...
Spatial complementary code keying modulation (SCCKM) is proposed as a novel block coding modulation scheme. An input binary sequence is modulated based on the different lengths of complementary code keying (CCK) modulation and then spread across the transmit antennas (spatial domain) in a multiple input multiple output (MIMO) system exploiting orthogonal frequency division multiplexing (OFDM). At...
Vehicle-roadside-vehicle relaying scheme has been studied as an effective means for improving the reliability of ITS V2V communication at intersection. However, hidden terminal (HT) problem that is caused by non-line-of-sight (NLOS) propagation at the intersection severely deteriorates packet reception at relay station (RS), which reduces the gain of relaying scheme. On the other hand, relaying increases...
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