Search results for: Mikko Vehkapera

Items from 1 to 20 out of 48 results

chapter

On the performance of full-duplex relaying schemes for point-to-point MIMO with large antenna arrays

Mengxue Tang, Mikko Vehkapera

2017 International Symposium on Wireless Communication Systems (ISWCS) > 246 - 251

2017 International Symposium on Wireless Communication Systems (ISWCS)

The performance of full-duplex (FD) decode-and-forward (DF) relaying systems for point-to-point multi-antenna transmission is considered. Three different relaying schemes are investigated: co-located, distributed cooperative and distributed non-cooperative. To mitigate the effects of loop interference (LI) caused by FD operation at the relay, a digital cancellation scheme based on pilot-aided channel...

article

Superimposed Pilots Are Superior for Mitigating Pilot Contamination in Massive MIMO

Karthik Upadhya, Sergiy A. Vorobyov, Mikko Vehkapera

IEEE Transactions on Signal Processing > 2017 > 65 > 11 > 2917 - 2932

In this paper, superimposed pilots are introduced as an alternative to time-multiplexed pilot and data symbols for mitigating pilot contamination in massive multiple-input multiple-output (MIMO) systems. We propose a non-iterative scheme for uplink channel estimation based on superimposed pilots and derive an expression for the uplink signal-to-interference-plus-noise ratio (SINR) at the output of...

chapter

Time-multiplexed / superimposed pilot selection for massive MIMO pilot decontamination

Karthik Upadhya, Sergiy A. Vorobyov, Mikko Vehkapera

2017 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) > 3459 - 3463

2017 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

In massive multiple-input multiple-output (MIMO) systems, superimposed (SP) and time-multiplexed (TM) pilots exhibit a complementary behavior, with the former and latter schemes offering a higher throughput in high and low inter-cell interference scenarios, respectively. Based on this observation, in this paper, we propose an algorithm for partitioning users into two disjoint sets comprising users...

chapter

Downlink performance of superimposed pilots in massive MIMO systems in the presence of pilot contamination

Karthik Upadhya, Sergiy A. Vorobyov, Mikko Vehkapera

2016 IEEE Global Conference on Signal and Information Processing (GlobalSIP) > 665 - 669

2016 IEEE Global Conference on Signal and Information Processing (GlobalSIP)

In this paper, we analyze the downlink (DL) performance of superimposed pilots in time division duplexing massive multiple-input multiple-output (MIMO) systems, and show that superimposed pilots offer an increased resilience to pilot contamination with respect to time-multiplexed pilots and data. Based on a closed form expression for the DL signal-to-interference-plus-noise ratio (SINR) at the user...

chapter

On the feasibility of full-duplex relaying powered by wireless energy transfer

Taneli Riihonen, Long Zhao, Mikko Vehkapera, Xiaodong Wang

2016 IEEE 17th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) > 1 - 5

2016 IEEE 17th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

We consider a wireless two-hop downlink communication system where a grid-connected source node transmits data to a destination node with the assistance of a full-duplex (FD) relay that is powered by wireless energy harvesting. The relay splits its received signal from the first hop into two streams for energy harvesting and information decoding, respectively. Meanwhile, it also forwards the decoded...

chapter

Power allocation for balancing the effects of channel estimation error and pilot overhead in full-duplex decode-and-forward relaying

Mikko Vehkapera, Taneli Riihonen, Risto Wichman, Baosheng Xu

2016 IEEE 17th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) > 1 - 5

2016 IEEE 17th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

This paper considers the transmit power balancing trade-off between the pilot and data signals in a two-hop full-duplex decode-and-forward relay link when the feedforward data channels are Rayleigh-fading and the residual feedback self-interference channel follows Rician-fading. The study concentrates on time-multiplexed orthogonal pilot sequences since simultaneously transmitted orthogonal pilots...

article

Asymptotic Performance Analysis of a $K$ -Hop Amplify-and-Forward Relay MIMO Channel

Maksym A. Girnyk, Mikko Vehkapera, Lars Kildehoj Rasmussen

IEEE Transactions on Information Theory > 2016 > 62 > 6 > 3532 - 3546

This paper studies the asymptotic performance of multi-hop amplify-and-forward relay multiple-antenna communication channels. Each multi-antenna relay terminal in the considered network amplifies the received signal, sent by a source, and retransmits it upstream toward a destination. Achievable ergodic rates of the relay channel with both jointly optimal detection and decoding and practical separate-decoding...

article

Analysis of Regularized LS Reconstruction and Random Matrix Ensembles in Compressed Sensing

Mikko Vehkapera, Yoshiyuki Kabashima, Saikat Chatterjee

IEEE Transactions on Information Theory > 2016 > 62 > 4 > 2100 - 2124

The performance of regularized least-squares estimation in noisy compressed sensing is analyzed in the limit when the dimensions of the measurement matrix grow large. The sensing matrix is considered to be from a class of random ensembles that encloses as special cases standard Gaussian, row-orthogonal, geometric, and so-called

$T$

-orthogonal constructions. Source vectors that have non-uniform sparsity...

chapter

Superimposed pilots: An alternative pilot structure to mitigate pilot contamination in massive MIMO

Karthik Upadhya, Sergiy A. Vorobyov, Mikko Vehkapera

2016 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) > 3366 - 3370

ICASSP 2016 - 2016 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

Superimposed pilots are proposed as an alternative to time-multiplexed pilot and data symbols for mitigating pilot contamination in massive multiple-input multiple-output systems. Provided that the uplink duration is larger than the total number of users in the system, superimposed pilots enable each user to be assigned a unique pilot sequence, thereby allowing for a significant reduction in pilot...

chapter

Transmission rate performance of symmetric two-way full-duplex links at large antenna-array limit

Taneli Riihonen, Mikko Vehkapera, Risto Wichman, Xiaodong Wang

2015 International Symposium on Wireless Communication Systems (ISWCS) > 301 - 305

2015 International Symposium on Wireless Communication Systems

This paper concerns the performance of two-way point-to-point multiple-input multiple-output (MIMO) links. In particular, the system of interest comprises a pair of multiantenna full-duplex terminals that communicate with each other through a MIMO radio channel under residual self-interference from imperfect mitigation using joint decoding for reception. The new theoretical result underlying this...

chapter

Asymptotic analysis of asymmetric MIMO links: EVM limits for joint decoding of PSK and QAM

Mikko Vehkapera, Taneli Riihonen, Maksym Girnyk, Emil Bjornson, more

2015 IEEE International Conference on Communications (ICC) > 1869 - 1873

ICC 2015 - 2015 IEEE International Conference on Communications

Hardware non-idealities in wireless transmitter electronics cause distortion that is not captured by conventional linear channel models; in fact, error-vector magnitude (EVM) measurements in conformance testing conceptually reduce their collective effect to an additive noise component at each subcarrier. Motivated by the EVM, the present paper considers a ‘binoisy’ multiple-input multiple-output (MIMO)...

article

On the Asymptotic Sum Rate of Downlink Cellular Systems With Random User Locations

Maksym A. Girnyk, Axel Muller, Mikko Vehkapera, Lars K. Rasmussen, more

IEEE Wireless Communications Letters > 2015 > 4 > 3 > 333 - 336

We consider a downlink cellular communication system with a multi-antenna base station (BS). A regularized zero forcing precoder is employed at the BS to manage the inter-user interference within the cell. Using methods from random matrix theory, we derive a deterministic approximation for the achievable ergodic sum rate, taking into account the randomness from both fading and random user locations...

chapter

MIMO wiretap channels with randomly located eavesdroppers: Large-system analysis

Maksym A. Girnyk, Frederic Gabry, Mikko Vehkapera, Lars K. Rasmussen, more

2015 IEEE International Conference on Communication Workshop (ICCW) > 480 - 484

2015 ICC - 2015 IEEE International Conference on Communications Workshops (ICC)

Security issues in wireless networks have become a subject of growing interest in recent years due to the broadcast nature of wireless channels. In this paper, we investigate secure communication over a multi-antenna wiretap channel in the presence of randomly distributed eavesdroppers. In the fast fading environment, the overall performance of this channel is traditionally characterized by the ergodic...

article

Asymptotic Analysis of SU-MIMO Channels With Transmitter Noise and Mismatched Joint Decoding

Mikko Vehkapera, Taneli Riihonen, Maksym A. Girnyk, Emil Bjornson, more

IEEE Transactions on Communications > 2015 > 63 > 3 > 749 - 765

Hardware impairments in radio-frequency components of a wireless system cause unavoidable distortions to transmission that are not captured by the conventional linear channel model. In this paper, a “binoisy” single-user multiple-input multiple-output (SU-MIMO) relation is considered where the additional distortions are modeled via an additive noise term at the transmit side. Through this extended...

chapter

On the optimal relay design for multi-antenna cognitive two-way AF relay networks

Maksym A. Girnyk, Mikko Vehkapera, Sergiy A. Vorobyov

2014 48th Asilomar Conference on Signals, Systems and Computers > 1579 - 1583

2014 48th Asilomar Conference on Signals, Systems and Computers

Cognitive relaying is an efficient method for tackling the problem of spectrum scarcity by serving new (secondary) users, while keeping the existing (primary) users satisfied with their service. Moreover, additional gains can be attained from employment of the two-way relaying with multiple-antenna relays within the secondary network. In this paper, we consider an underlay two-way cognitive network...

chapter

Signal recovery using expectation consistent approximation for linear observations

Yoshiyuki Kabashima, Mikko Vehkapera

2014 IEEE International Symposium on Information Theory > 226 - 230

2014 IEEE International Symposium on Information Theory (ISIT)

A signal recovery scheme is developed for linear observation systems based on expectation consistent (EC) mean field approximation. Approximate message passing (AMP) is known to be consistent with the results obtained using the replica theory, which is supposed to be exact in the large system limit, when each entry of the observation matrix is independently generated from an identical distribution...

chapter

Analysis of regularized LS reconstruction and random matrix ensembles in compressed sensing

Mikko Vehkapera, Yoshiyuki Kabashima, Saikat Chatterjee

2014 IEEE International Symposium on Information Theory > 3185 - 3189

2014 IEEE International Symposium on Information Theory (ISIT)

Performance of regularized least-squares estimation in noisy compressed sensing is studied in the limit when the problem dimensions grow large. The sensing matrix is sampled from the rotationally invariant ensemble that encloses as special cases the standard IID and row-orthogonal constructions. The analysis is carried out using the replica method in conjunction with some novel matrix integration...

chapter

Asymptotic properties of dual-hop AF relay MIMO communication systems

Maksym A. Girnyk, Mikko Vehkapera, Lars K. Rasmussen

2014 IEEE International Symposium on Information Theory > 476 - 480

2014 IEEE International Symposium on Information Theory (ISIT)

The present paper studies the asymptotic performance of dual-hop amplify-and-forward multiple-input multiple-output relay communication systems. In the corresponding setup, a relay amplifies the signal received from a source, retransmitting it towards a destination, while the direct source-destination link is absent. Ergodic achievable rates under separate decoding, along with the average bit error...

article

Large-System Analysis of Correlated MIMO Multiple Access Channels with Arbitrary Signaling in the Presence of Interference

Maksym A. Girnyk, Mikko Vehkapera, Lars K. Rasmussen

IEEE Transactions on Wireless Communications > 2014 > 13 > 4 > 2060 - 2073

Presence of multiple antennas on both sides of a communication channel promises significant improvements in system throughput and power efficiency. In effect, a new class of large multiple-input multiple-output (MIMO) communication systems has recently emerged and attracted both scientific and industrial attention. To analyze these systems in realistic scenarios one has to include such aspects as...

article

Blind Pilot Decontamination

Ralf R. Muller, Laura Cottatellucci, Mikko Vehkapera

IEEE Journal of Selected Topics in Signal Processing > 2014 > 8 > 5 > 773 - 786

A subspace projection to improve channel estimation in massive multi-antenna systems is proposed and analyzed. Together with power-controlled hand-off, it can mitigate the pilot contamination problem without the need for coordination among cells. The proposed method is blind in the sense that it does not require pilot data to find the appropriate subspace. It is based on the theory of large random...

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MIMO (16)
VECTORS (14)
CHANNEL ESTIMATION (13)
INTERFERENCE (9)
RECEIVERS (9)
SIGNAL TO NOISE RATIO (9)
NOISE (8)
DECODING (7)
MASSIVE MIMO (6)
RELAYS (6)
REPLICA METHOD (6)
ANTENNAS (5)
ESTIMATION (5)
JOINTS (4)
LARGE-SYSTEM ANALYSIS (4)
MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) SYSTEMS (4)
SUPERIMPOSED PILOTS (4)
MULTIACCESS COMMUNICATION (3)
MULTIPLE ANTENNAS (3)
MUTUAL INFORMATION (3)
NOISE MEASUREMENT (3)
PILOT DECONTAMINATION (3)
RAYLEIGH CHANNELS (3)
RECEIVING ANTENNAS (3)
STOCHASTIC PROCESSES (3)
THROUGHPUT (3)
TRAINING (3)
WIRELESS COMMUNICATION (3)
BIT ERROR RATE (2)
COMPRESSED SENSING (2)
CONFERENCES (2)
CONTAMINATION (2)
CORRELATION (2)
DELAY (2)
DOWNLINK (2)
EIGENVALUES AND EIGENFUNCTIONS (2)
FADING (2)
INDEXES (2)
ITERATIVE DECODING (2)
LINEAR MINIMUM MEAN-SQUARED ERROR (LMMSE) CHANNEL ESTIMATION (2)
MATCHING PURSUIT ALGORITHMS (2)
MEAN SQUARE ERROR METHODS (2)
MIMO SYSTEMS (2)
MULTIPLEXING (2)
MULTIUSER DETECTION (2)
PARTIAL TRANSMIT SEQUENCES (2)
PERFORMANCE ANALYSIS (2)
PHASE SHIFT KEYING (2)
PRINCIPAL COMPONENT ANALYSIS (2)
SELF-INTERFERENCE (2)
SPARSE MATRICES (2)
STANDARDS (2)
TRANSMITTER (2)
TRANSMITTERS (2)
UPLINK (2)
ACHIEVABLE RATE (1)
ACHIEVABLE RATES (1)
ACHIEVABLE TRANSMISSION RATES (1)
ADDITIVE NOISE (1)
ANTENNA ARRAYS (1)
ANTENNA CORRELATION (1)
APPROXIMATION METHODS (1)
ARRAYS (1)
ARTIFICIAL INTELLIGENCE (1)
ATOMIC MEASUREMENTS (1)
AUTHENTICATION (1)
AVAILABILITY (1)
BELIEF PROPAGATION (1)
BIASED CONVOLUTIONAL CODES (1)
BIASED SIGNALING (1)
BIDIRECTIONAL COMMUNICATION (1)
CHANNEL ESTIMATOR (1)
CHANNEL STATE INFORMATION (1)
CODE DIVISION MULTIPLE ACCESS (1)
CODE-DIVISION MULTIPLE-ACCESS (CDMA) SYSTEMS (1)
COHERENCE (1)
COMMUNICATION SYSTEM SECURITY (1)
COMPLEXITY THEORY (1)
COMPRESSED SENSING MATRICES (1)
COMPRESSIVE SAMPLING (1)
CONVOLUTIONAL CODES (1)
CORRELATED RAYLEIGH FADING MIMO CHANNEL (1)
COVARIANCE MATRIX (1)
CSI (1)
DATA PRIVACY (1)
DECODE-AND-FORWARD (DF) (1)
DENSITY EVOLUTION (1)
DETECTORS (1)
DICTIONARIES (1)
DIGITAL MODULATION (1)
DIRECT-SEQUENCE CODE-DIVISION MULTIPLE-ACCESS (DS-CDMA) SCHEMES (1)
EDUCATIONAL INSTITUTIONS (1)
EIGENVALUE SPECTRUM (1)
EIGENVALUES OF RANDOM MATRICES (1)
ENCRYPTION (1)
ENERGY EXCHANGE (1)
ENERGY HARVESTING (1)
ENTROPY (1)
EQUATIONS (1)
ERGODIC CAPACITY (1)
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INFONA - science communication portal

Search results for: Mikko Vehkapera

On the performance of full-duplex relaying schemes for point-to-point MIMO with large antenna arrays

Superimposed Pilots Are Superior for Mitigating Pilot Contamination in Massive MIMO

Time-multiplexed / superimposed pilot selection for massive MIMO pilot decontamination

Downlink performance of superimposed pilots in massive MIMO systems in the presence of pilot contamination

On the feasibility of full-duplex relaying powered by wireless energy transfer

Power allocation for balancing the effects of channel estimation error and pilot overhead in full-duplex decode-and-forward relaying

Asymptotic Performance Analysis of a $K$ -Hop Amplify-and-Forward Relay MIMO Channel

Analysis of Regularized LS Reconstruction and Random Matrix Ensembles in Compressed Sensing

Superimposed pilots: An alternative pilot structure to mitigate pilot contamination in massive MIMO

Transmission rate performance of symmetric two-way full-duplex links at large antenna-array limit

Asymptotic analysis of asymmetric MIMO links: EVM limits for joint decoding of PSK and QAM

On the Asymptotic Sum Rate of Downlink Cellular Systems With Random User Locations

MIMO wiretap channels with randomly located eavesdroppers: Large-system analysis

Asymptotic Analysis of SU-MIMO Channels With Transmitter Noise and Mismatched Joint Decoding

On the optimal relay design for multi-antenna cognitive two-way AF relay networks

Signal recovery using expectation consistent approximation for linear observations

Analysis of regularized LS reconstruction and random matrix ensembles in compressed sensing

Asymptotic properties of dual-hop AF relay MIMO communication systems

Large-System Analysis of Correlated MIMO Multiple Access Channels with Arbitrary Signaling in the Presence of Interference

Blind Pilot Decontamination

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