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The high mobile data traffic growth requires investments in radio access networks. Network capacity expansion can be achieved by increasing the number of base stations, increasing the network spectral efficiency and obtaining additional spectrum. This study assumes a constant number of base station to compare two potential future network deployment scenarios; the Licensed Shared Access scenario (LSA),...
This paper presents a study on uplink capacity of an LTE public safety network supporting video surveillance in order to assist first responders when they need to visualize remotely a critical area. Using system-level simulations, the number of supported surveillance camera users within a cell area of interest is determined. Targeted bit rate in uplink is 512 kbps.
This paper investigates a Full-Duplex transceiver using an active cancellation technique where an additional transmit chain is employed to create the self-interference cancellation signal. Both transmitters and also the receiver are impaired by frequency-dependent I/Q imbalance with different parameters. It is shown how an I/Q parameter deviation in these chains deteriorates the achievable self-interference...
In wideband sensing receivers, especially in low-cost mass-product devices, the sensing operation is usually done in a range where the RF front-end components, such as the LNAs exhibit a nonlinear behavior. Consequently, intermodulation (IMD) and crossmodulation (XM) are generated and cause distortion in the spectrum sensing region. This paper investigates the impact on the threshold level setting...
We propose linear coordinated transmit-receive beamforming methods for spatial underlay direct device-to-device (D2D) communication in cellular networks where the user terminals (UTs) employ multiple antenna elements. For a D2D terminal pair, direct communication is a beneficial alternative compared to the cellular mode, where the UTs communicate to each other via a base station (BS) that acts as...
This article reviews existing related work and identifies the main challenges in the key 5G area at the intersection of waveform design and large-scale multiple antenna systems, also known as Massive MIMO. The property of self-equalization is introduced for Filter Bank Multicarrier (FBMC)-based Massive MIMO, which can reduce the number of subcarriers required by the system. It is also shown that the...
For over a decade the quest for new means to improve the efficiency of spectrum use has motivated researchers all over the world to come up with innovative concepts for spectrum sharing. During this time, several concepts have been created and investigated, however, only a small part of them has raised industry interest or stimulated further discussions in the regulatory domain. Even a smaller part...
The paper leverages the emerging paradigm of Network Function Virtualization (NFV) in an attempt to outline from the network management point of view the current trends on the road to 5G region. To that end, relevant architectural frameworks and concepts have been presented and the anticipated network densification through the notion of Edge Cloud has been discussed.Within this context, added value...
The surge of mobile broadband Internet access has nowadays reached the critical point that traffic is projected to increase dramatically in the next years and even the 4G UMTS Long term Evolution (LTE) cellular technology and its advanced version LTE-A might lack enough flexibility and system reconfiguration capability. For these reasons, the quest for the Fifth Generation (5G) of cellular technology...
This paper presents the results and analysis of diffraction measurements around a building corner at 10 GHz. Radio channel measurement setup contains a 4-port vector network analyzer and two virtual antenna arrays. Angle of arrival analysis is carried out to distinguish the diffracted path from the other multipath components in the impulse response. Results are analyzed with respect to the Fresnel...
The millimeter-wave band is a candidate to overcome the spectrum shortage in future mobile radio networks. As the coverage area of base stations operating at these frequencies is expected to be more limited than at the sub 6 GHz bands, they will supplement existing base stations instead of replacing them. With these additional small cells a split plane architecture becomes an interesting architectural...
In this article, we provide an overview of the 5GETLA radio interface proposal for low latency dense small-cell networks. We discuss the new physical layer parametrization and frame design to support high energy and spectral efficiency in wireless small-cell communications and compare the main parameters with another recent physical layer design proposed for 5G centimeter wave communications. The...
This paper presents the analysis of departure elevation angles for the urban microcell radio channel measurements at 2.3 GHz. The measurements were conducted with EB Propsound CS™ for 30 × 16 antenna configuration in Oulu city center, Finland. The transmitter (Tx) antenna heights of 5 m and 10 m were used. The Tx antenna elements were arranged in the plus shape and nine antenna elements were placed...
Wireless 5G systems will not only be “4G, but faster”. One of the novel features discussed in relation to 5G is Ultra-Reliable Communication (URC), an operation mode not present in today's wireless systems. URC refers to provision of certain level of communication service almost 100 % of the time. Example URC applications include reliable cloud connectivity, critical connections for industrial automation...
In this paper, we investigate the use of a transfer learning approach applied to a topology management framework in a 5G heterogeneous aerial-terrestrial broadband access network, to reduce energy consumption and deployment cost, and improve system capacity and QoS. We implement a cognitive engine at the base station (BS), with reinforcement learning algorithms applied at the link level for spectrum...
Energy saving is an increasing trend in wireless communications development activities. This paper investigates how historic traffic load data can be used to estimate and set the load threshold used for switching on or off base stations or their features on a particular weekday. The use is enhanced by an abnormal day detection feature that is used to prevent undesired power on/off actions on days...
Spectrally efficient frequency division multiplexing (SEFDM) improves spectral efficiency relative to the well known orthogonal frequency division multiplexing (OFDM). Optimal detection of SEFDM, to recover signals corrupted by inter carrier interference (ICI), has major drawbacks in the exponential growth of detection complexity with the enlargement of system size and modulation level. This poses...
Improved spectral and energy efficiency are two key requirements for the fifth generation (5G) wireless communication systems. The inefficiency and non-linearity of traditional power amplifiers (PA) pose significant challenges to meet these requirements, especially for multicarrier modulation signals (MCM) with high peak to average power ratio (PAPR). In this paper, we study methods to improve the...
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