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The target for a new 5G radio access technology is to support multi-Gbps and ms latency connectivity simultaneously at noticeably lower energy consumption and cost compared to the existing 4G technologies, such as LTE-Advanced. Extremely short air interface latency is required to achieve these requirements in a TDD-based local area network. In this paper, we discuss how the required short TDD latency...
This paper presents a low latency radio interface design for future 5G local area communications that provides transmission latencies less than 1 ms while providing sufficient spectral efficiency. We concentrate on the excellent latency aspects of the proposed 5GETLA radio interface and discuss the factors leading to very low latency and high energy efficiency. In addition, we study two different...
5G technology is a broad concept that describes the envisaged disruptive evolution of communication technology in the near future, with a dramatic increase in the network data-rate and capacity to support a variety of innovative services. The exploitation of the new spectrum available at mmWaves represents a key enabler for 5G. mmWaves are expected to revolutionize the indoor wireless connectivity...
When planar antenna arrays are introduced at the base stations (BSs) of cellular networks, accurate modeling of the spatial radio channel in there-dimension (3D) will become crucial. In this paper, a field measurement campaign was conducted to characterize the 3D spatial propagation to the BS in urban street canyon environments. Using a wideband channel sounder with two uniform planar antenna arrays,...
Intelligent transport systems (ITS) require low-latency dependable wireless communication links between transmitter and receiver. In vehicular communication scenarios communication channels are highly dispersive which makes the design of appropriate channel estimators especially difficult. In this paper we address the problem of non-stationary vehicular channel estimation for 3GPP long term evolution...
A two-hop multi-user multiple-input-multiple-output (MU-MIMO) system with multiple single-antenna amplify-and-forward (AF) relays is demonstrated for the first time in a realistic indoor environment with a commercial software radio platform, using OFDM. Good trend correspondence is observed between the averaged error rate results of experiment and simulation, when zero forcing (ZF) detection is employed...
In large-scale antenna systems (LSAS), both energy efficiency (EE) and spectral efficiency (SE) have been recognized as important metrics for future communication system design. This paper investigates the fundamental properties of the EE-SE relationship in LSAS. Both single-user and multi-user cases are studied and different channel state information (CSI) conditions are considered. Analysis and...
Generalized Frequency Division Multiplexing (GFDM) is a multicarrier transmission scheme that offers flexible pulse shaping of individual subcarriers. The application of pulse shaping per subcarrier can control the out of band (OOB) radiation and create non-orthogonal waveforms. In this paper, the influence of the pulse shaping to the overall system performance, namely bit error rate (BER) over AWGN...
The fast adoption of smart phone triggers the migration of tremendous internet applications from desktop to mobile terminal, as well as various inherently mobile oriented applications. Among them, Instant Message (IM) represents a large portion of applications. Unlike over traditional wired network, IM brought a great trouble to the mobile network called “signaling storm” due to its small data dominated...
Understanding and solving performance-related issues of current and future (5G+) networks requires the availability of realistic, yet simple and manageable, traffic models which capture and regenerate various properties of real traffic with sufficient accuracy and minimum number of parameters. Traffic in wireless cellular networks must be modeled in the space domain as well as the time domain. Modeling...
This paper considers the downlink heterogeneous cellular network, which contains multiple types of access nodes, such as macrocells and picocells. A novel utility function maximization technique is proposed based on the Sharpe ratio (introduced by the Nobel laureate in Economic Sciences William F. Sharpe in 1966) for the design of user association to the base stations, and the corresponding resource...
The industrial wireless automation sector exhibits a huge market growth in the last years. Today, many applications already use wireless technologies. However, the existing wireless solutions do not yet offer sufficient performance with respect to real-time and reliability requirements, particularly for closed-loop control applications. As a result, low latency wireless communication technologies...
In this paper, we present a theoretical analysis of the impact of High Power Amplifier (HPA) Non-Linear Distortion (NLD) on the Bit Error Rate (BER) of multicarrier techniques. For the aim of this study, the Saleh's model was chosen for NL HPA. Two multicarrier schemes are considered: the classical Orthogonal Frequency Division Multiplexing (OFDM) and the Filter Bank based Multi-Carrier (FBMC). According...
We present a novel scheme coined as adaptive interleaved encoding (AIE) that enhances the spectral efficiency of wireless communication systems. In particular, AIE can compensate the spectral efficiency loss due the pilot transmission and the resultant channel estimation errors when the receiver employs for example nearest-neighbour decoding by using the estimated channel gain as it were the true...
Device-to-Device (D2D) communications is considered as one of the key technologies for 5G wireless communications system, since it offers several advantages compared with traditional cellular network, i.e. low end-to-end latency and high spectral efficiency. By allowing underlaying direct D2D communications, a D2D link which reuses the spectral resources of a cellular user causes increased interference...
In this paper, we propose a full-duplex wireless communication system by means of reflected power. Our concept is based on backscatter modulation (BM), where electromagnetic waves are modulated, amplified and reflected by the same antenna that receives them. We consider two nodes that wish to exchange data over wireless additive white Gaussian noise with Rayleigh fading channel. Within this framework...
Innovations for cost-effective and scalable wireless backhaul solutions in practical mobile network deployment scenarios are essential for realizing the 5G vision of providing “Gbit/s anywhere”. Not only is the backhaul essential to support network densification based on small cell deployments, but also for supporting very low latency inter-BS communication to combat inter-cell interference. Multiplexing...
In the recent years the millimeter wave spectrum is being explored as a prospective band for the next generation (5G) cellular communications. In this paper we study the propagation of the the millimetre wave spectrum using ray tracing model for an urban environment. We consider the ISM bands in 24GHz and 61GHz in particular and conduct ray tracing simulations to study the path loss behaviour in terms...
This article considers the problem of packet scheduling for localization in an underwater acoustic sensor network where sensor nodes are distributed randomly in an operating area. Our goal is to minimize the localization time, and to do so we consider two packet transmission schemes, namely collision-free, and collision-tolerant. Through analytical results and numerical examples the performances of...
The adoption of millimeter waves will give the possibility to integrate massive antenna arrays inside next generation tablets and smartphones, with consequent significant enhancement of their communication performance. Besides communication, the availability of such a technology can also enable other interesting applications such as personal radar for accurate simultaneous localization and mapping...
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