Recently, two different L-band digital aeronautical communication systems (L-DACS), i.e., L-DACS1 and L-DACS2, have been proposed as future infrastructure candidates for air-to-ground (AG) systems, with selected the best candidate. In this paper, we describe a filter bank multicarrier (FBMC)-based system show its advantages over L-DACS systems. We provide simulation results all three to fairly compare their power spectral density, peak-to-average ratio (PAPR), bit error (BER) performance....

Urban air mobility (UAM) is a concept for creating an airborne transportation system that operates in urban settings with on-board pilot and/or remote command (RPIC), or fully autonomous architecture. Although the passenger traffic will be mostly and near environments, UAM also being considered cargo, perhaps between cities. Such capability pushing current communication, navigation surveillance (CNS) / management (ATM) systems were not designed to support these types of aviation scenarios....

In this study, we propose a framework for chirp-based communications by exploiting discrete Fourier transform-spread orthogonal frequency division multiplexing (DFT-s-OFDM). We show that well-designed frequency-domain spectral shaping (FDSS) filter DFT-s-OFDM can convert its single-carrier nature to linear combination of chirps circularly translated in the time domain. Also, properties series and Bessel function first kind, analytically obtain FDSS an arbitrary chirp. theoretically with low...

The paper proposes a geometrical-statistical modeling approach for the air-ground channel communications, navigation, and surveillance (CNS) systems in L-band frequency range. We sketch architecture of model with its six elements show how their parameters can be derived from measurement data. Preliminary results obtained relatively small set data reveal that proposed is well suited to capture time variant behavior channel. However, considerably more extensive evaluation will necessary...

Filter bank multi-carrier (FBMC) offers superior spectral properties compared to cyclic-prefix orthogonal frequency-division multiplexing (CP-OFDM), at the cost of an inherent shortcoming in dispersive channels called intrinsic imaginary interference. In this paper, we propose a new FBMC-based communication system using two polarizations for wireless systems: dual-polarization FBMC (DP-FBMC). Using can significantly suppress Therefore DP-FBMC all multicarrier techniques used CP-OFDM systems...

The demand for air transportation is continuously growing. Likewise, unmanned aircraft systems (UAS) are proliferating at a tremendous pace. Both current and future air-to-ground (AG) communications will be deployed in the L-band (960-1164 MHz), possibly other bands. Aiming toward modernization, Eurocontrol recently defined two L-Band Digital Aeronautical Communication Systems (L-DACS). Primary goals of LDACS high data rate transmission reliability. There L-DACS technology candidates, LDACS1...

Aeronautical vehicle use, and consequently, air-to-ground communication systems, are growing rapidly. A portion of these vehicles unmanned aerial (UAVs) or systems (UAS) operating in civil aviation systems. As a consequence this growth, air traffic volume for is increasing dramatically, it estimated that density will at least double by 2025. This growth has led authorities to explore development future infrastructures (FCI). The L-band digital aeronautical system one (L-DACS1) the air-ground...

Airspaces worldwide are becoming more heavily used. This includes the use of unmanned aircraft systems, which is rapidly growing. In order to ensure reliable communication for aircraft, air-ground channel must be accurately characterized. A significant impairment that has not been thoroughly studied airframe shadowing-obstruction line-of-sight signal by itself. this paper, we report on measured results shadowing phenomenon in two frequency bands, a medium-sized aircraft. We present example...

The correlation between signals received on multiple antennas is a function of the channel(s) them, and analysis this useful for spatial diversity multiplexing. In paper we compute correlations in both frequency domains classical two-ray channel SIMO setting an air-ground setting. We analyze "pure" (deterministic) case, also include results case where incurs Ricean fading. After describing basic analysis, show corroborating NASA measurement over-sea channel. that domain are numerically...

Demands for very reliable and robust communications systems are becoming commonplace, this is true air-to-ground (AG) systems, which seeing increased usage, particularly unmanned aircraft. Available spectrum exists AG in the L-band (960-1164 MHz). Two L-Band Digital Aeronautical Communication Systems (L-DACS) were recently defined, LDACS1 LDACS2. The L-DACS1 scheme employs a fairly broadband (0.5 MHz) transmission using Cyclic-Prefix Orthogonal Frequency-Division Multiplexing (CP-OFDM)...

Aviation traffic is on the rise, in part due to a large increase number of unmanned aerial systems (UAS), also known as vehicles (UAVs). With rise vehicle will come increased communication traffic, and for air-ground communications to/from all these air vehicles, new are required. In this paper we evaluate via simulations performance two candidate over empirical channel models. These models - here 5 GHz band based an extensive measurement campaign sponsored by NASA, with ground sites...

We present a geometrical-statistical architecture to model the air-ground channel. In this paper we focus on modeling elements influencing line-of-sight path: ground multi-path propagation, antenna effects, and shadowing. validate channel against sounding data from flight experiments collected in 2013.

In a recent work we proposed new radio access technique based on filter bank multi-carrier (FBMC) modulation using two orthogonal polarizations: dual-polarization FBMC (DP-FBMC). We showed that with good cross-polarization discrimination (XPD), DP-FBMC solves the intrinsic imaginary interference shortcoming of without extra processing. also has other interesting advantages over cyclic prefix frequency-division multiplexing (CP-OFDM) and such as more robustness in dispersive channels, it is...

The use of aeronautical vehicles and consequently their communication traffic are growing rapidly, soon there will be demands for channels with larger bandwidths. L-band digital system (L-DACS1) was proposed by EUROCONTROL as an OFDM based multicarrier candidate, "inlayed" between distance measuring equipment (DME) channels. We previously a similar on the Filter Bank Multicarrier (FBMC) technique, which has some significant advantages over L-DACS1. In this paper several diversity multiple...

The VHF band has been widely used for aviation voice communication using analog systems decades. However, due to fast increasing transportation and high usage of channels, the is becoming much more crowded, use waveforms will likely not maintain required performance quality service in future. Therefore, digital have considered studied their larger spectral efficiency. Notably, proposed are broadband (B-VHF) multi carrier-code division multiple access (MC-CDMA), data link modes 2 3 (VDL2/3)...

Growth in aviation has resulted crowding of the traditional VHF spectrum many parts world. In response to this, several organizations have investigated use L-band (~1-2 GHz) for future communications. The International Civil Aviation Organization (ICAO) Digital Communications Infrastructure Working Group (DCI-WG) is currently working on standardizing an Aeronautical Communication System (LDACS, formerly LDACS-1). This system uses orthogonal frequency division multiplexing (OFDM) multicarrier...

Civil aviation is continuing to grow, and along with growth in numbers of flights passengers comes communications. In particular airport surface environments are one the areas which rapid development communication systems taking place. Several years ago Federal Aviation Administration, EUROCONTROL, International Organization proposed a system based on WiMAX technology for areas: AeroMACS. The AeroMACS designed civil aircraft but could also be applied military airports as well. this paper we...

In 2017 we reported on NASA"s Aeronautics Research Mission Directorate (ARMD) University Leadership Initiative (ULI) program, and in particular the launching of our Hyper-Spectral Communications Networking for Air Traffic Management (ATM) (HSCNA) project. The HSCNA project is only ULI program to address communications networking. Since that time team has made progress multiple areas: (i) review NASA FAA future Concepts Operations (ConOps) National Airspace System identification relevant...

Aviation growth is occurring in all sectors of the industry: numbers commercial passenger, freight, experimental, and especially unmanned flights are rising steadily. This requires advances aeronautics as well air traffic management (ATM). Multiple organizations worldwide working on research development for future ATM, including NASA FAA, EuroControl, major airlines, aviation support industries, academia. Three key elements underlying efficient ATM communications, navigation, surveillance...

Aeronautical communication systems will play an increasingly important role in the future. Due to increasing flight traffic, which is estimated double by 2025, and inadequacy of current aeronautical support such increase, demand for new state art increasing. In this paper we investigate a spectrally shaped Filter Bank Multicarrier (SS-FBMC) based system air ground communication. We study 0.5 MHz as inlay between 1 separated distance measurement equipment (DME) channels L-band. The idea using...

In this paper we describe the overall idea and results of a recently proposed radio access technique based on filter bank multicarrier (FBMC) communication system using two orthogonal polarizations: dual-polarization FBMC (DP-FBMC). Using can alleviate intrinsic interference problem in systems. This enables use all techniques used cyclic-prefix frequency-division multiplexing (CP-OFDM) systems for channel equalization, multiple-input/multiple-output (MIMO) processing, etc., without extra...

In a recent work, we proposed spectral shaping (SS) algorithm, which via adaptively selecting and allocating subcarrier powers at the transmitter can attain additive white Gaussian noise (AWGN) theoretical performance results in non-white (e.g., interference) spectra. This knowing received interference channel power density transmitter, solves an optimization problem to maximize Shannon capacity subject few constraints. Solving this provides selected subcarriers allocates total available...