A5035859437- PAPR reduction in OFDM
- Satellite Communication Systems
- Advanced Wireless Communication Techniques
- Wireless Communication Networks Research
- Advanced Power Amplifier Design
- Radar Systems and Signal Processing
- Advanced Adaptive Filtering Techniques
- Power Line Communications and Noise
- Cognitive Radio Networks and Spectrum Sensing
- Space Satellite Systems and Control
- Opportunistic and Delay-Tolerant Networks
- Optical Network Technologies
- Advancements in PLL and VCO Technologies
- Advanced MIMO Systems Optimization
- Digital Filter Design and Implementation
- Analog and Mixed-Signal Circuit Design
- Modular Robots and Swarm Intelligence
- Advanced Optical Network Technologies
- Millimeter-Wave Propagation and Modeling
- Image and Signal Denoising Methods
- Space exploration and regulation
- Antenna Design and Optimization
- Optical Wireless Communication Technologies
- Vibration and Dynamic Analysis
- Spacecraft Design and Technology
VTT Technical Research Centre of Finland
2015-2025
During the New Space era small countries are becoming important players in space business. While activities rapidly increasing globally, it is to make operations a sustainable and safe way order preserve satellite services for future generations. Unfortunately, sustainability aspect has been largely overlooked existing surveys on technologies. As result, this survey paper, we discuss multi-layer networking approaches 6G specifically from perspective. Moreover, our comprehensive includes...
A critical component of any unmanned and autonomous ship is the wireless communication system supporting efficient safe operations. This paper studies connectivity challenges ships in different environments, including ports, deep sea, Arctic regions. Data requirements for transmission regarding environmental sensors remote maintenance as well control needs are identified paper. Multiple systems needed resilient operations to fulfill capacity, latency, secure needs. hybrid concept that...
In this paper, we study the future 5G radar that uses same transmit energy and spectral efficient multicarrier waveform for both sensing communication. The technique is an interesting tool to open at time access radio bands assigned traditionally either or regulation status first given, then automotive, marine aviation scenarios are presented. numerology derived, show resolution requirement adaptive cruise control achieved with band of 400 MHz. When effective isotropic radiated power 20 dBm,...
In this paper, we apply a space-borne radar and communications (SBRC) concept for detecting space debris over signals that are designed solely communication purposes. By using hidden capability of intersatellite to act as signal well, propose new approach detection can be used address the challenges long-distance ground-based without introducing separate infrastructure. The performance proposed SBRC is evaluated from two timely perspectives in emerging satellite communications, i.e....
In this paper we study the suitability of constant envelope multi-carrier modulation technique for implementation 1 Gbps wireless link at 60 GHz. This combines orthogonal frequency division multiplexing (OFDM) and phase (PM) where: (1) PM creates a signal which allows high power amplifier to operate near saturation levels thus maximizing efficiency, (2) OFDM increases robustness multipath fading. Since OFDM-PM symbols satisfy symmetry property, maximum-ratio combiner (MRC) can be used...
We present an interdisciplinary survey of the history loosely coupled systems. apply presented concepts in communication networks and suggest hybrid self-organizing (SONs) as a universal model for future networks. Self-organizing can fulfill tight requirements but are challenging to use due their complexity immaturity. Moreover, lack externally defined goal centralized control has resulted many distributed systems failing. This is because nonlinear relationships between system parts result...
The radio frequency spectrum is a scarce natural resource and its efficient use of the utmost importance. A fundamental problem facing future wireless systems where to find suitable bands meet demand services. promising technique improve utilization under lot investigation cognitive (CR) concept. This paper provides an overview CR study with discussion on enabling techniques for CR, measurements current use, forthcoming standardization activities some findings from our recent research...
Summary DVB‐S2X is the cornerstone for satellite communication standards forming state of art broadband waveforms. In this paper, we propose new application scenarios and advanced techniques, including a reference design implementing superframing, predistortion, robust synchronization chain, plug‐and‐play channel interleaver. We demonstrate by means software simulations hardware tests that can be common technology enabler land‐mobile, aeronautical, maritime in addition to more traditional...
Antenna array beamforming reduces multipath fading components, and decreases the complexity of equalizer in a single carrier receiver. Nonlinear analog parts cause, however, impairments beamforming. In this paper we show that when separate antenna elements include nonlinear amplifiers with different amplitude modulation to (AM-AM) phase (AM- PM) conversions, there are errors level main beam direction beam, respectively. There no if is noise at input array. Anyhow, may dramatically distort...
We propose a method to simulate impairments caused by the nonideal analog parts of transmitter-receiver. They include for example high-power amplifier (HPA), mixers, and oscillators. The major advantage in our approach is that model parameters are adjustable system works real time digital domain. Conventional methods have either not been time, or they implemented with circuits. HPA coordinate rotation computer (CORDIC) algorithm rectangular polar translations. A look-up table (LUT) used...
In this paper, we present a novel method that detects appearing targets and improves their detection probability in known static environment. Ray tracing-based channel model is used to calculate the radio signal paths using 3D of This preliminary information measured radar image are delivered convolutional neural network (CNN) based autoencoder (AE). The output provides an improved representation targets, as redundancy coming from environment modeled cancelled image. does not need...
Timing adjustment in a digital modem is performed by interpolation after sampling with fixed clock. A novel interpolator structure proposed to avoid extrapolation problem, which arises if the clock rate assumed be equal nominal of output signal. The simulations indicate that works well and superior conventional implementation.
Abstract This paper considers constant envelope orthogonal frequency‐division multiplexing (CE‐OFDM) that is an attractive candidate for the future Long Term Evolution over satellite and device‐to‐device communications in merging public safety commercial networks. The modulation allows power amplifier (PA) to operate near saturation levels thus maximizing efficiency. Because phase noise transforms just into additive term after detector, CE‐OFDM has significant advantage compared with...