Novel Lattice Reduction Algorithms: Precoder reduction and vector perturbation tradeoffs

  • Guenach M.

In this letter we present a novel iterative lattice reduction algorithm in precoded multiple input multiple output (MIMO) transmission. A unified framework is developed for this purpose, to reduce the precoder maximum row norm by iteratively minimizing the weighted sum of the precoder rownorms. We show that at each iteration ...

Multilevel Continuous Polarization Modulation with High Spectral Efficiency in the Depolarization Channels

  • Li R.
  • Liu F.
  • Wang B.
  • Wang X.

Facing the challenges of spectrum shortage and complex depolarization effects in wireless communication, a multilevel continuous polarization modulation (MCPoM) scheme is investigated to achieve high spectral efficiency and improve the symbol error rate performance in the practical depolarization channels. The principle of the MCPoM modulation is stated in details on ...

Measured Uplink Interference Caused by Aerial Vehicles in LTE Cellular Networks

  • Amorim R.
  • Biro D.
  • Kovacs I.
  • Mogensen P.
  • Nguyen H.
  • Sorensen M.
  • Sorensen T.
  • Wigard J.

Aerial users, such as unmanned aerial vehicles (UAVs), experience different radio propagation conditions than users on the ground. This is a concern regarding the integration of such users in the cellular networks in the near future. This paper investigates the impact of uplink transmissions from an aerial user equipment. Full ...

Multi-Flow Transmitter with Full Format and Rate Flexibility for Next Generation Networks

  • A. Vannucci
  • Boitier F.
  • C. Tsokos
  • Ch. Kouloumentas
  • D. Felipe
  • Dupuy J.
  • H. Avramopoulos
  • Jenneve P.
  • Jorge F.
  • Konczykowska A.
  • M. Spyropoulou
  • M. Tienforti
  • Mardoyan H.
  • N. Keil
  • P. Groumas
  • T. K. Johansen
  • V.Katopodis

We extend our proof-of-concept demonstration of a novel multi-flow transmitter for next generation optical metro networks. The multi-flow concept is based on the combination of spectrum and polarization sliceability, and its implementation on the combination of a polymer photonic integration platform with high-speed IQ modulators. In this work, we replace ...

Server Placement and Selection for Edge Computing in the ePC

  • Abe Y.
  • Hadzic I.
  • Woithe H.

Mobile Edge Computing (MEC) has received much attention from the research community in recent years. A significant part of the published work has studied the telecom-centric MEC architecture, which assumes that the computing resource is located at the edge of the mobile access network (e.g., the Evolved Packet Core or ...

A Tutorial on Lossy Forwarding Cooperative Relaying

Lossy decode-and-forward (DF) relaying, also referred to as lossy forwarding (LF), can significantly enhance the transmission reliability and expand the communication coverage at the cost of a small increase in computational effort compared to its DF counterpart. Furthermore, it can further simplify the operations at the relay nodes by removing ...

Dynamic Network Function Instance Scaling Based on Traffic Forecasting and VNF Placement in Operator Data Centers

Traffic in operator networks is time varying. Conventional network functions implemented by black-boxes should satisfy the peak traffic requirement, and hence result in low resource utilization. Thanks to the emergence of Virtual Network Function (VNF), which is realized by running networking software on Virtual Machines (VMs), the operator can dynamically ...

A 64-Element 28-GHz Phased-Array Transceiver With 52-dBm EIRP and 8-12-Gb/s 5G Link at 300 Meters Without Any Calibration

This paper presents a 64-element 28-GHz phased-array transceiver for 5G communications based on 2x2 transmit/receive (TRX) beamformer chips. Sixteen of the 2x2 TRX chips are assembled on a 12-layer printed circuit board (PCB) together with a Wilkinson combiner/divider network and 28-32-GHz stacked-patch antennas. The 64-element array results in 1.1 dB ...

Modulation over Nonlinear Fourier Spectrum: Continuous and Discrete Spectrum

Nonlinear Frequency Division Multiplexed (NFDM) systems are considered when data is modulated in both parts of the nonlinear Fourier spectrum: continuous spectrum and discrete spectrum. An efficient algorithm is introduced to generate a time-domain signal from a given nonlinear spectrum. The transmission of such NFDM symbols is experimentally demonstrated over ...

Modulation on Discrete Nonlinear Spectrum: Perturbation Sensitivity and Achievable Rates

Multi-soliton pulses are studied under small perturbations. By means of mutual information (MI), we show that the nonlinear spectrum becomes correlated when a 64-PSK modulated 2-eigenvalues soliton is perturbed by a small additive white Gaussian noise (AWGN). Transmission over two channels are considered: an AWGN channel (back-to-back scenario) and an ...

A Low-Cost Scalable 32-Element 28-GHz Phased Array Transceiver for 5G Communication Links Based on a 2x2 Beamformer Flip-Chip Unit Cell

This paper presents a scalable 28-GHz phased-array architecture suitable for fifth-generation (5G) communication links based on four-channel (2x2) transmit/receive (TRX) quad-core chips in SiGe BiCMOS with flip-chip packaging. Each channel of the quad-core beamformer chip has 4.6-dB noise figure (NF) in the receive (RX) mode and 10.5-dBm output 1-dB compression ...

25.4 Tb/s Transmission over Trans-Pacific Distances Using Truncated Probabilistically Shaped PDM-64QAM

Probabilistic constellation shaping (PCS), digital nonlinear compensation, and multi-rate spatially coupled low-density parity check codes are used to achieve 25.4 Tb/s transmission over 10,285km EDFA-only straight-line testbed at 6.1 bits/symbol/Hz. The gain provided by PCS over standard 64QAM is investigated over trans-Atlantic and trans-Pacific distances. Moreover, the potential benefits of ...

A Multiscale Sparse Array of Spatially-Spread Electromagnetic-Vector-Sensors for Direction Finding and Polarization Estimation

A multiscale sparse array, which is composed of spatially-spread electromagnetic-vectorsensors (SS-EMVSs), is proposed to estimate the direction-of-arrivals (DOA) and polarizations of multiple sources. The SS-EMVS is composed of three orthogonally oriented but spatially noncollocated dipoles to measure the electric field and three orthogonally oriented but spatially noncollocated loops to measure ...

Compact High Isolation Base-Station Duplexer Using Triple-Mode Ceramic Cavities

  • Abbosh A.
  • Hendry D.

A microwave duplexer with high isolation is presented. The device is based on triple mode filters that are built using silver plated ceramic cuboids. To create a six-pole, six-transmission zero filter in the DCS-1800 band, which is utilized in mobile communications, two cuboids are cascaded. To shift spurious harmonics, low ...

A Unified Array Geometry Composed of Multiple Identical Subarrays With Hole-Free Difference Coarrays for Underdetermined DOA Estimation

In this paper, we propose a unified array geometry, dubbed generalized nested subarray (GNSA), for the underdetermined direction-of-arrival estimation. The GNSA is composed of multiple, identical subarrays, which can be a minimum redundancy array (MRA), a (super) nested array, a uniform linear array (ULA), or any other linear arrays with ...

MIMO Time-domain Equalization for High-Speed Continuous Transmission Under Channel Variability

High-speed communication over mutually coupled channels can be severely affected by intersymbol interference (ISI) and crosstalk (XT). Multiple-input multiple-output (MIMO) equalization is known to mitigate both ISI and XT, but requires accurate channel information at the receiver (RX) and/or transmitter (TX) when the channel is stochastic. However, since adjusting the ...

Network Slicing & Softwarization: A Survey on Principles, Enabling Technologies & Solutions

Network slicing has been identified as the backbone of the rapidly evolving 5G technology. However, as its consolidation and standardization progress, there are no literatures that comprehensively discuss its key principles, enablers and research challenges. This paper elaborates network slicing from an end-to-end perspective detailing its historical heritage, principal concepts, ...

A Fast and Low-Loss Electromagnetically Tunable Optical Filter

Fast and simple optical filtering is a prerequisite for low-cost passive optical networking using multiple wavelengths to scale to higher capacity. We demonstrate a simple electromagnetically tuned optical filter capable of tuning across more than 700 GHz of optical spectrum in under 1 ms with low optical loss. We show ...

A Latency and Reliability Guaranteed Resource Allocation Scheme for LTE V2V Communication Systems

By leveraging the direct device-to-device (D2D) interaction, LTE Vehicle-to-Vehicle (V2V) communication becomes a promising solution to meet the stringent requirements of vehicular communication. In this paper, we propose to jointly optimize radio resource, power allocation, and modulation/coding schemes of the V2V communications, in order to guarantee the latency and reliability ...

Towards Massive Connectivity Support for Scalable mMTC Communications in 5G networks

  • Bockelmann C.
  • De Carvalho E.
  • Demestichas P.
  • Gregoratti D.
  • Ji Y.
  • Kosmatos E.
  • Navarro M.
  • Popovski Petar
  • Pratas N.
  • Raceala-Motoc M.
  • Saur S.
  • Schellmann M.
  • Stefanovic C.
  • Vivier G.
  • Wang Q.
  • Wunder G.

The fifth generation of cellular communication systems is foreseen to enable a multitude of new applications and use cases with very different requirements. A new 5G multiservice air interface needs to enhance broadband performance as well as provide new levels of reliability, latency and supported number of users. In this ...