A5044286247- Advanced MIMO Systems Optimization
- Advanced Wireless Network Optimization
- Cooperative Communication and Network Coding
- Advanced Wireless Communication Techniques
- Wireless Communication Security Techniques
- Wireless Communication Networks Research
- PAPR reduction in OFDM
- Sparse and Compressive Sensing Techniques
- Blind Source Separation Techniques
- Wireless Networks and Protocols
- Advanced Wireless Communication Technologies
- Wireless Signal Modulation Classification
- Distributed Sensor Networks and Detection Algorithms
- Age of Information Optimization
- Indoor and Outdoor Localization Technologies
- Chaos-based Image/Signal Encryption
- Advanced Queuing Theory Analysis
- Speech and Audio Processing
- Adversarial Robustness in Machine Learning
- Network Traffic and Congestion Control
- Optical Network Technologies
- Cryptography and Data Security
- Advanced Power Amplifier Design
- Cryptographic Implementations and Security
- IoT and Edge/Fog Computing
Freie Universität Berlin
2015-2024
Park Plaza Hospital
2024
Monash University Malaysia
2024
University of Southern Denmark
2022
Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute
2009-2018
Technische Universität Dresden
2017
Vodafone (Germany)
2017
Fraunhofer Society
2003-2016
Technische Universität Berlin
2009-2015
China Mobile (China)
2005
There is considerable pressure to define the key requirements of 5G, develop 5G standards, and perform technology trials as quickly possible. Normally, these activities are best done in series but there a desire complete tasks parallel so that commercial deployments can begin by 2020. will not be an incremental improvement over its predecessors; it aims revolutionary leap forward terms data rates, latency, massive connectivity, network reliability, energy efficiency. These capabilities...
This article provides some fundamental indications about wireless communications beyond LTE/LTE-A (5G), representing the key findings of European research project 5GNOW. We start with identifying drivers for making transition to 5G networks. Just name one, advent Internet Things and its integration conventional human-initiated transmissions creates a need system redesign. Then we make clear that strict paradigm synchronism orthogonality as applied in LTE prevents efficiency scalability....
The fifth generation of cellular communication systems is foreseen to enable a multitude new applications and use cases with very different requirements. A 5G multi-service air interface needs enhance broadband performance as well provide levels reliability, latency, supported number users. In this paper, we focus on the massive Machine Type Communications (mMTC) service within interface. Specifically, present an overview physical medium access techniques address problem attempts in mMTC...
Peak power control for multicarrier communications has been a long-lasting problem in signal processing and communications. However, industry academia are confronted with new challenges regarding energy efficient system design. Particularly, the envisioned boost network efficiency (e.g. at least by factor of 1000 Green Touch consortium) will tighten requirements on component level so that gap respect to single-carrier transmission must considerably diminish. This paper reflects these...
As it becomes increasingly apparent that 4G will not be able to meet the emerging demands of future mobile communication systems, question what could make up a 5G system, are crucial challenges and key drivers is part intensive, ongoing discussions. Partly due advent compressive sensing, methods can optimally exploit sparsity in signals have received tremendous attention recent years. In this paper we describe variety scenarios which signal arises naturally wireless systems. Signal...
LTE and LTE-Advanced have been optimized to deliver high bandwidth pipes wireless users. The transport mechanisms tailored maximize single cell performance by enforcing strict synchronism orthogonality within a contiguous frequency band. Various emerging trends reveal major shortcomings of those design criteria: (1) fraction machine-type-communications (MTC) is growing fast. Transmissions this kind are suffering from the bulky procedures necessary ensure synchronism. (2) Collaborative...
We introduce a random access procedure where control and data information is transmitted in the same "access" slot. The key idea data-overlayed signalling together with dedicated frequency area for compressive measurements exploiting sparse channel profiles and, potentially, user activity. This architecture resource-efficent since otherwise pilots have to be suitably placed time-frequency grid every potential user. analyze achievable rates depending on design parameters show by simulations...
WIRELESS COMMUNICATIONS (Twireless) contains high-quality technical manuscripts on advances in the state of art wireless communications.Both theoretical contributions (including new techniques, concepts, and analyses) practical system experiments, prototypes, applications) are encouraged.Tutorial expositions permanent reference value also welcome.All members IEEE eligible for membership Society upon payment annual fee $30.00.
We introduce a "one shot" random access procedure where users can send message without priori synchronizing with the network. In this common overloaded control channel is used to jointly detect sparse user activity and profiles. The detected information subsequently demodulate data in dedicated frequency slots. analyze system theoretically provide link between achievable rates standard compressing sensing estimates terms of explicit expressions scaling laws. Finally, we support our findings...
End-to-end learning of communication systems with neural networks and particularly autoencoders is an emerging research direction which gained popularity in the last year. In this approach, learn to simultaneously optimize encoding decoding functions establish reliable message transmission. paper, line thinking extended scenarios eavesdropper must further be kept ignorant about communication. The secrecy transmission achieved by utilizing a modified secure loss function based on...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> Optimal link adaption to the scattering function of wide sense stationary uncorrelated (WSSUS) mobile communication channels is still an unsolved problem despite its importance for next-generation system design. In a multicarrier transmission, such performed by pulse shaping, i.e., properly adjusting transmit and receive filters. Pulse-shaped offset–quadratic-amplitude-modulation systems have...
Massive MTC support is an important future market segment, but not yet efficiently supported in cellular systems. In this paper we follow-up on recent concepts combining advanced MAC protocols with Compressed Sensing (CS) based multiuser detection. Specifically, introduce a concept for sparse joint activity, channel and data detection the context of Coded ALOHA (FDMA) protocol. We will argue that simple activity sufficient (as many papers do) because control resources are order data....
End-to-end deep learning for communication systems, i.e., systems whose encoder and decoder are learned, has attracted significant interest recently, due to its performance which comes close well-developed classical encoder-decoder designs. However, one of the drawbacks current approaches is that a differentiable channel model needed training underlying neural networks. In real-world scenarios, such hardly available often density not even known at all. Some works, therefore, focus on...
The paper addresses the problem of estimating peak value bandlimited signals from their samples with and without oversampling. This has significant relevance to orthogonal frequency-division multiplexing (OFDM) signal processing system design. In particular, an upper bound on is established given oversampling rate. Moreover, it shown that bounds are sharp for all practical rates by constructing taking this bound. proof also provides a local characterization in neighborhood extremum. A...
Optimal link adaption to the scattering function of wide-sense stationary uncorrelated (WSSUS) mobile communication channels is still an unsolved problem despite its importance for next-generation system design. In multicarrier transmission, such performed by pulse shaping, i.e., properly adjusting transmit and receive filters. For example, pulse-shaped offset-quadrature amplitude modulation (OQAM) systems have recently been shown superior performance over standard cyclic prefix orthogonal...
Secret key establishment based on parameters of the communication channel is a highly attractive option for many applications that operate in dynamic mobile environment with peer-to-peer association. On other hand, high usability and management are still very difficult to achieve wireless devices which have under strict resource constraints. In fact, most previously reported generation methods cannot such environment.In this work, we present new system architecture suitable also...
Numerical evidence suggests that compressive sensing (CS) approaches for wideband massive MIMO channel estimation can achieve very good performance with limited training overhead by exploiting the sparsity of physical channel. However, analytical characterization (minimum) requirements is still an open issue. By observing be represented a vector not simply sparse but has well defined structural properties, referred to as hierarchical sparsity, we propose low complexity estimators uplink...
Ultra-wideband (UWB) is a state-of-the-art technology designed for applications requiring centimeter-level localization. Its widespread adoption by smartphone manufacturer naturally raises security and privacy concerns. Successfully implementing Radio Frequency Fingerprinting (RFF) to UWB could enable physical layer security, but might also allow undesired tracking of the devices. The scope this paper explore feasibility applying RFF investigates how well technique generalizes across...
The rapid expansion of connected devices has amplified the need for robust and scalable security frameworks. This paper proposes a holistic approach to securing network-connected devices, covering essential layers: hardware, firmware, communication, application. At hardware level, we focus on secure key management, reliable random number generation, protecting critical assets. Firmware is addressed through mechanisms like cryptographic integrity validation boot processes. For emphasize TLS...
This article analyzes the crest-factor behavior of an orthogonal frequency-division multiplexing (OFDM) modem. The is characterized in terms complementary distribution function (CDFC). CDFC a key parameter OFDM systems, for example it provides limits on achievable information rates. Several approximations have been developed literature so far, but no true upper bounds dependent different constellations that are used modulation derived. A new approach given providing substitute time-consuming...
In this paper generalized bounds on the crest-factor (CF) distribution in orthogonal frequency-division multiplexing (OFDM) transmission for both independent and dependent subcarriers are derived. Here, latter situation represents coded case. For subcarriers, a general path bounding practical constellations is provided. Moreover, complete characterization of their asymptotic behavior devised discussed. The results shown to carry over spherical improving recent results. focus mainly binary...
This paper reports intermediate transceiver and frame structure concepts corresponding results from the European FP7 research project 5GNOW. The core is unified concept which supports an integrated 5G air interface, capable of dealing both with broadband data services small packet within same band. It essential for this to introduce waveforms are more robust than OFDM, e.g., respect time-frequency misalignment. Encouraging candidate waveform technologies presented discussed respective...