Non-Orthogonal Coded Access for Contention-Based Transmission in 5G

  • Liu M.
  • Miao D.
  • Sun J.
  • Wang Q.
  • Zhang Y.
  • Zhao Z.
  • Zhong Z.

The fifth generation (5G) wireless network faces unprecedented massive concurrent random access requests in uplink (UL) contention-based (CB) transmission. In this paper, a non-orthogonal coded access (NOCA) UL transmission in combination with parallel interference cancellation (PIC) based reception scheme at base station is investigated. Non-orthonormal code generated by Zadoff-Chu (ZC) ...

Transport Network Design for FrontHaul

  • Bouillard A.
  • Deiss T.
  • Mathieu F.
  • Sehier P.

The evolution of LTE and advent of 5G networks increases further the bandwidth requirements for RAN. In parallel, the deployment of Centralized RAN architecture raises new challenges on the FrontHaul network. The inflexibility of the legacy CPRI is the primary challenge to Virtualized RAN deployments, and there is currently a ...

Cost of Increased Bandwidth Efficiency in 5G NR

  • Levanen T.
  • Pajukoski K.
  • Renfors M.
  • Valkama M.

In this paper, subband filtered CP-OFDM and windowed CP-OFDM waveforms proposed for 5G new radio (NR) are compared to LTE-like downlink and uplink waveforms under different power amplifier (PA) models. The effects of subband filtering or windowing are evaluated in terms of out-of-band and inband emissions, average error vector magnitude ...

Optimizing Synchronous Handover in Cloud RAN

  • Gimenez L.
  • Kolding T.
  • Pedersen K.

Radio networks are at the brink of a transformation in order to meet new requirements for high data and device densities expected for the Internet-of-Things (IoT) era. Cloud technology is positioned to be a key element in building effective 5G radio networks, so-called Cloud RANs. In this paper, we focus ...

Interference Analysis for UAV Connectivity over LTE Using Aerial Radio Measurements

  • Amorim R.
  • Kovacs I.
  • Mogensen P.
  • Nguyen H.
  • Wigard J.

The use of Unmanned Aerial Vehicles (UAV) for civilian and commercial services has experienced a significant increase in the past couple of years. Emerging UAV enabled services, however, require extended beyond-visual-line-of-sight geographical range. One key regulatory requirement for these services is that the radio communication link must reliably cover a ...

Applying Neural Networks in Optical Communication Systems: Possible Pitfalls

  • Buelow H.
  • Eriksson T.
  • Leven A.

We investigate the risk of overestimating the performance gain when applying neural network based receivers in systems with pseudo random bit sequences or with limited memory depths, resulting in repeated short patterns. We show that with such sequences, a large artificial gain can be obtained which comes from pattern prediction ...

On the Bit Error Rate of Optical Transmission Systems Corrupted by Bivariate Additive White Gaussian Noise

  • Bigo S.
  • Delezoide C.
  • Essiambre R.
  • Frignac Y.
  • Jenneve P.
  • Layec P.
  • Ramantanis P.

We derive in integral form the exact Bit Error Probability for QPSK constellations corrupted by elliptic AWGN. We show that for an in-phase/quadrature noise the performance only depends on the overall Signal to Noise Ratio and not on noise ellipticity.

32-degree OXC with very low add/drop contention

This study reports a colorless/directionless wavelength routing Optical Cross-Connect (OXC) based on multicast switch partially equipped with variable splitters, to achieve a 32-degree OXC with negligible add/drop contention probability and still with reasonable intermediate amplification.

Impact of Software Defined Contention in OXC at network level

This study quantifies how software defined contention influences the number of MCS-based add/drop stages needed to serve a given set of connections, over 2 distinct WDM network topologies.

Numerical Investigation and Scaling Rules for the Estimation of Nonlinear Interference Variability of Dispersion Managed and Unmanaged Systems in Presence of PMD and Kerr Effects

  • Fazel S.
  • Frignac Y.
  • Ramantanis P.
  • Rossi N.

We estimate the Kerr nonlinear noise variance for WDM-PDM QPSK links and its variability in presence of PMD. Results specify rules giving the PMD-based NLI statistics and its evolution with distance for both legacy and recent coherent link designs. Introduction Prediction of Quality of Transmission (QoT) has been actively investigated, ...

Duobinary IQ Modulation Schemes for C- and O-band PAM4 Direct Detect Systems

  • Buchali F.
  • Buelow H.
  • Chagnon M.
  • Dischler R.
  • Eriksson T.
  • Stephan Ten Brink

We present two novel modulation schemes for PAM4 direct detect systems employing duobinary signals as least and most significant bit. One format, designed for C-band, is experimentally demonstrated at 70 GBaud. The other, for O-band, is compared to conventional PAM4.

Achieving Near Maximum Ratio Combining Diversity Gains With Directive Antennas

  • Chizhik D.
  • Feick R.
  • Rodriguez M.
  • Valenzuela R.

We present an empirically based comparison of the effectiveness of spatial and angular diversity systems in outdoor-to-indoor fixed wireless links. We concentrate on the simple to implement, single RF-chain selection diversity systems. We find that for such systems, angular diversity very significantly outperforms spatial diversity using comparatively sized arrays. This ...

Fully monolithic integrated silicon photonics slave transceiver for short-reach network

  • Chen Y.
  • De Valicourt G.
  • Dong P.
  • Kakande J.
  • Sinsky J.
  • Tkach R.

We demonstrate an ultra-compact monolithic integrated silicon-based slave transceiver integrating a D-BPSK receiver and a polarization insensitive reflective modulator. We successfully achieved 25 Gbit/s OOK-NRZ modulation for the upstream and 25 Gbit/s D-BPSK detection for the downstream as well as transmission over the full C-band and few km.

Distributed Transmission and Spatially-Coupled Coding in Multi-Point to Point Networks

  • Buchali F.
  • Eriksson T.
  • Gebhard U.
  • Schmalen L.

We investigate the performance of coded modulation for multi-hop regenerative optical networks. We analyze various simplifications to compute LLRs, compute the achievable rates and show how to optimize distributed spatially coupled FEC schemes.

An improved method for on-demand system information broadcast in 5G networks

  • Ali A.
  • Awada A.
  • Michalopoulos D.

We argue for a new method that applies to on-demand system information (SI) broadcast transmissions. The proposed method is targeted for 5G networks, and is based upon utilizing a cut-off value for the modulation and coding scheme used for broadcasting. Two variants of the proposed scheme are presented, namely the ...

Data plane protocols and fragmentation for 5G

  • Kantola R.
  • Tilli J.

Mobile networks up to this point have used general packet radio service (GPRS) tunneling protocol (GTP) in the core network. The fifth generation (5G) will be a major revolution in mobile networks and there have been discussions onto adopting a different protocol, with the proposals being generic routing encapsulation (GRE), ...

Impact of cyclic prefix configuration on mobility performance of multi-connectivity in 5G networks

  • Awada A.
  • Fettweis G.
  • Simsek M.
  • Tesema F.
  • Viering I.

Service interruptions from mobility events, such as handovers and connection failures, are some of the major impairments for fulfilling the ultra-reliability requirements in fifth Generation (5G) mobile networks. One of the solutions to tackle the aforementioned challenges is multi-connectivity with Single Frequency Network (SFN) transmission, which refers to noncoherent joint ...

Energy efficiency of 5G mobile networks with base station sleep modes

  • Hronec M.
  • Jolma P.
  • Lahdekorpi P.
  • Moilanen J.

The paper presents system level simulation results on future base station energy saving using a time-triggered sleep model. The energy efficiency of future base station is compared in macro cellular network against a comparable baseline without usage of sleep modes. Furthermore, results for corresponding 4G case are shown using a ...

Machine learning using neural networks in digital signal processing for RF transceivers

  • Fischer G.
  • Jueschke P.

Communication is changing to a wireless world. Any wireless communication system needs radio frontends (transceivers) to link higher layer signals to the air interface. The increasing standard and technology diversity require transceivers with high flexibility supporting many of frequencies, standards and signal requirements. Design to cost, the demand for highest ...

NoSQL stores for coreless mobile networks

  • Flinck H.
  • Ojala F.
  • Rao A.
  • Tarkoma S.

The goals of 5G networks â?" low latency, high bandwidth, and support for fast mobility â?" are non-trivial and they demand improvements across all involved technology fields. Researchers are therefore exploring approaches that leverage on network function virtualization and software-defined networking for meeting the demands of verticals expected to use ...