662 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of PotsdamDE34 papers
- University of HelsinkiFI26 papers
- Aalto UniversityFI23 papers
- Tampere UniversityFI18 papers
- Centre National de la Recherche ScientifiqueFR17 papers
- Northeastern UniversityUS17 papers
- University of JyväskyläFI14 papers
- Brown UniversityUS13 papers
- Technical University of MunichDE13 papers
- Aarhus UniversityDK12 papers
- Helsinki Institute of PhysicsFI10 papers
- Charles UniversityCZ9 papers
24 papers · 1 filter
Empirical Effects of Dynamic Human-Body Blockage in 60 GHz Communications
Christopher Slezak, Vasilii Semkin, Sergey Andreev +2
The millimeter wave (mmWave) bands and other high frequencies above 6~GHz have emerged as a central component of Fifth-Generation (5G) cellular standards to deliver high data rates…
Wirelessly Powered Crowd Sensing: Joint Power Transfer, Sensing, Compression, and Transmission
Xiaoyang Li, Changsheng You, Sergey Andreev +2
Leveraging massive numbers of sensors in user equipment as well as opportunistic human mobility, mobile crowd sensing (MCS) has emerged as a powerful paradigm, where prolonging bat…
Estimation and Mitigation of Channel Non-Reciprocity in Massive MIMO
Orod Raeesi, Ahmet Gokceoglu, Mikko Valkama
Time-division duplex (TDD) based massive MIMO systems rely on the reciprocity of the wireless propagation channels when calculating the downlink precoders based on uplink pilots. H…
Spatio-Temporal Waveform Design for Multi-user Massive MIMO Downlink with 1-bit Receivers
Ahmet Gokceoglu, Emil Bjornson, Erik Larsson +1
Internet-of-Things (IoT) refers to a high-density network of low-cost low-bitrate terminals and sensors where also low energy consumption is one central feature. As the power-budge…
Performance Analysis of Multi-User Massive MIMO Downlink under Channel Non-Reciprocity and Imperfect CSI
Orod Raeesi, Ahmet Gokceoglu, Yaning Zou +2
This paper analyzes the performance of linearly precoded time division duplex based multi-user massive MIMO downlink system under joint impacts of channel non-reciprocity (NRC) and…
Low-Complexity Sub-band Digital Predistortion for Spurious Emission Suppression in Noncontiguous Spectrum Access
Mahmoud Abdelaziz, Lauri Anttila, Chance Tarver +3
Noncontiguous transmission schemes combined with high power-efficiency requirements pose big challenges for radio transmitter and power amplifier (PA) design and implementation. Du…
Sum-Rate Analysis and Optimization of Self-Backhauling Based Full-Duplex Radio Access System
Dani Korpi, Taneli Riihonen, Ashutosh Sabharwal +1
In this article, a radio access system with a self-backhauling full-duplex access node serving legacy half-duplex mobile devices is studied and analyzed. In particular, it is assum…
Performance Analysis of Energy Detection over Mixture Gamma based Fading Channels with Diversity Reception
Omar Alhussein, Ahmed Al Hammadi, Paschalis C. Sofotasios +4
The present paper is devoted to the evaluation of energy detection based spectrum sensing over different multipath fading and shadowing conditions. This is realized by means of a u…
K-Means Fingerprint Clustering for Low-Complexity Floor Estimation in Indoor Mobile Localization
Alireza Razavi, Mikko Valkama, Elena-Simona Lohan
Indoor localization in multi-floor buildings is an important research problem. Finding the correct floor, in a fast and efficient manner, in a shopping mall or an unknown universit…
Compressive Identification of Active OFDM Subcarriers in Presence of Timing Offset
Alireza Razavi, Mikko Valkama, Danijela Cabric
In this paper we study the problem of identifying active subcarriers in an OFDM signal from compressive measurements sampled at sub-Nyquist rate. The problem is of importance in Co…
Entropy and Channel Capacity under Optimum Power and Rate Adaptation over Generalized Fading Conditions
Paschalis C. Sofotasios, Sami Muhaidat, Mikko Valkama +2
Accurate fading characterization and channel capacity determination are of paramount importance in both conventional and emerging communication systems. The present work addresses…
Compressive Detection of Random Subspace Signals
Alireza Razavi, Mikko Valkama, Danijela Cabric
The problem of compressive detection of random subspace signals is studied. We consider signals modeled as where is an $N \times K…
Solutions to Integrals Involving the Marcum Q-Function and Applications
Paschalis C. Sofotasios, Sami Muhaidat, George K. Karagiannidis +1
Novel analytic solutions are derived for integrals that involve the generalized Marcum Q-function, exponential functions and arbitrary powers. Simple closed-form expressions are al…
Analytic solutions to a Marcum Q-function-based integral and application in energy detection of unknown signals over multipath fading channels
Paschalis C. Sofotasios, Mikko Valkama, Theodoros A. Tsiftsis +3
This work presents analytic solutions for a useful integral in wireless communications, which involves the Marcum function in combination with an exponential function and arb…
The Area Under a Receiver Operating Characteristic Curve Over Enriched Multipath Fading Conditions
Paschalis C. Sofotasios, Mulugeta K. Fikadu, Khuong Ho-Van +2
This work is devoted to the analysis of the performance of energy detection based spectrum sensing in the presence of enriched fading conditions which are distinct for the large nu…
Wideband Self-Adaptive RF Cancellation Circuit for Full-Duplex Radio: Operating Principle and Measurements
Timo Huusari, Yang-Seok Choi, Petteri Liikkanen +3
This paper presents a novel RF circuit architecture for self-interference cancellation in inband full-duplex radio transceivers. The developed canceller is able to provide wideband…
Analysis and Augmented Spatial Processing for Uplink OFDMA MU-MIMO Receiver with Transceiver I/Q Imbalance and External Interference
Aki Hakkarainen, Janis Werner, Kapil R. Dandekar +1
We address receiver (RX) signal processing in MIMO systems under in-phase/quadrature (I/Q) imbalance, which causes cross-talk of mirror-subcarriers in OFDM systems. We extend the t…
Reference Receiver Based Digital Self-Interference Cancellation in MIMO Full-Duplex Transceivers
Dani Korpi, Lauri Anttila, Mikko Valkama
In this paper we propose and analyze a novel self-interference cancellation structure for in-band MIMO full-duplex transceivers. The proposed structure utilizes reference receiver…
Widely-Linear Digital Self-Interference Cancellation in Direct-Conversion Full-Duplex Transceiver
Dani Korpi, Lauri Anttila, Ville Syrjälä +1
This article addresses the modeling and cancellation of self-interference in full-duplex direct-conversion radio transceivers, operating under practical imperfect radio frequency (…
Analysis of Oscillator Phase-Noise Effects on Self-Interference Cancellation in Full-Duplex OFDM Radio Transceivers
Ville Syrjala, Mikko Valkama, Lauri Anttila +2
This paper addresses the analysis of oscillator phase-noise effects on the self-interference cancellation capability of full-duplex direct-conversion radio transceivers. Closed-for…
Full-Duplex Transceiver System Calculations: Analysis of ADC and Linearity Challenges
Dani Korpi, Taneli Riihonen, Ville Syrjälä +3
Despite the intensive recent research on wireless single-channel full-duplex communications, relatively little is known about the transceiver chain nonidealities of full-duplex dev…
Assessing coupling dynamics from an ensemble of time series
German Gomez-Herrero, Wei Wu, Kalle Rutanen +3
Finding interdependency relations between (possibly multivariate) time series provides valuable knowledge about the processes that generate the signals. Information theory sets a n…
Universal Codes as a Basis for Nonparametric Testing of Serial Independence for Time Series
Boris Ryabko, Jaakko Astola
We consider a stationary and ergodic source generated symbols from some finite set and a null hypothesis that is Markovian source with memory (or co…
Fast Codes for Large Alphabets
Boris Ryabko, Jaakko Astola, Karen Egiazarian
We address the problem of constructing a fast lossless code in the case when the source alphabet is large. The main idea of the new scheme may be described as follows. We group let…