Search results for: Alexander Onic

Items from 1 to 12 out of 12 results

chapter

Novel mixed-signal based short-range leakage canceler for FMCW radar transceiver MMICs

Alexander Melzer, Mario Huemer, Alexander Onic

2017 IEEE International Symposium on Circuits and Systems (ISCAS) > 1 - 4

2017 IEEE International Symposium on Circuits and Systems (ISCAS)

The continuous operation of frequency modulated continuous wave (FMCW) radar transceivers leads to permanent leakage from the transmit into the receive path. Besides leakage within FMCW radar systems itself, unwanted reflections from a close object in front of the radar antennas results in so-called short-range (SR) leakage. Specifically the phase noise (PN) contained in the SR leakage causes a severe...

article

Online Phase-Noise Estimation in FMCW Radar Transceivers Using an Artificial On-Chip Target

Alexander Melzer, Alexander Onic, Mario Huemer

IEEE Transactions on Microwave Theory and Techniques > 2016 > 64 > 12-2 > 4789 - 4800

The presence of phase noise (PN) severely deteriorates the sensitivity and range of frequency-modulated continuous wave radar systems. Thus, characterization and continuous monitoring of the PN is indispensable, and its estimation is often employed directly on chip. Although many contributions investigate methods for PN estimation, almost all of them consider a continuous-wave (CW) input signal. Differently,...

chapter

Phase noise estimation in FMCW radar transceivers using an artificial on-chip target

Alexander Melzer, Alexander Onic, Mario Huemer

2016 IEEE MTT-S International Microwave Symposium (IMS) > 1 - 4

2016 IEEE/MTT-S International Microwave Symposium - MTT 2016

Estimation of phase noise (PN) has become economically feasible for use within integrated circuits. Several concepts have been proposed that obtain an estimate with high accuracy. However, these concepts require a continuous wave input signal during measurement. In this work we aim to estimate the PN power spectrum of a frequency modulated continuous wave (FMCW) radar transceiver simultaneously with...

article

Short-Range Leakage Cancelation in FMCW Radar Transceivers Using an Artificial On-Chip Target

Alexander Melzer, Alexander Onic, Florian Starzer, Mario Huemer

IEEE Journal of Selected Topics in Signal Processing > 2015 > 9 > 8 > 1650 - 1660

A major drawback of frequency modulated continuous-wave (FMCW) radar systems is the permanent leakage from the transmit into the receive path. Besides leakage within the radar device itself, signal reflections from a fixed object in front of the antennas additionally introduce so-called short-range (SR) leakage. It causes a strong degradation of detection sensitivity due to the unpreventable phase...

article

Design and analysis of UW-OFDM signals

Mario Huemer, Christian Hofbauer, Alexander Onic, Johannes B. Huber

AEUE - International Journal of Electronics and Communications > 2014 > 68 > 10 > 958-968

Unique word-orthogonal frequency division multiplexing (UW-OFDM) is a novel signaling concept where the guard interval is implemented as a deterministic sequence, the so-called unique word. The UW is generated by introducing a certain level of redundancy in the frequency domain. Different data estimation strategies and the favourable bit error ratio (BER) performance of UW-OFDM, as well as comparisons...

article

Noise Interpolation for Unique Word OFDM

Alexander Onic, Mario Huemer

IEEE Signal Processing Letters > 2014 > 21 > 7 > 814 - 818

Unique word-orthogonal frequency division multiplexing (UW-OFDM) is known to feature an excellent bit error ratio performance when compared to conventional OFDM using cyclic prefixes (CP). In recent papers classical and Bayesian linear data estimators as well as the non-linear sphere decoding (SD) approach have been investigated in the UW-OFDM context. In general, the remaining error samples after...

chapter

Widely linear data estimation for unique word OFDM

Mario Huemer, Alexander Onic, Christian Hofbauer, Stefan Trampitsch

2013 Asilomar Conference on Signals, Systems and Computers > 1934 - 1938

2013 Asilomar Conference on Signals, Systems and Computers

Unique word — orthogonal frequency division multiplexing (UW-OFDM) is known to feature an excellent bit error ratio performance when compared to conventional OFDM using cyclic prefixes (CP). In recent papers linear and non-linear UW-OFDM receivers have been investigated and compared for proper data vectors consisting of QPSK and 16-QAM symbols. In this work we derive the widely linear minimum mean...

chapter

Soft-output sphere detection for coded Unique Word OFDM

Alexander Onic, Andreas Schenk, Mario Huemer, Johannes B. Huber

2012 Conference Record of the Forty Sixth Asilomar Conference on Signals, Systems and Computers (ASILOMAR) > 138 - 142

2012 46th Asilomar Conference on Signals, Systems and Computers

Unique Word (UW) OFDM is an attractive alternative to conventional cyclic-prefix OFDM as it offers the potential to apply more sophisticated detection schemes, resulting in improved performance both in uncoded as well as coded transmission. In this paper, we study soft-output detection schemes suited for coded UW-OFDM transmission. In particular, we present an efficient implementation of near-optimum...

article

On the Exploitation of the Redundant Energy in UW-OFDM: LMMSE Versus Sphere Detection

Mario Huemer, Christian Hofbauer, Alexander Onic, Johannes B. Huber

IEEE Signal Processing Letters > 2012 > 19 > 6 > 340 - 343

Unique word orthogonal frequency division multiplexing (UW-OFDM) inherently introduces a complex number Reed Solomon (RS) code. Originally, the code generator matrix of systematic coded UW-OFDM had been designed rather intuitively by minimizing the mean redundant energy. In this work we justify this approach by applying a cost function that incorporates the overall transceiver chain including a linear...

chapter

Sphere Decoding for Unique Word OFDM

Alexander Onic, Mario Huemer

2011 IEEE Global Telecommunications Conference - GLOBECOM 2011 > 1 - 5

GLOBECOM 2011 - 2011 IEEE Global Communications Conference

The recently presented UW-OFDM (Unique Word - orthogonal frequency division multiplexing) signaling scheme [1] uses certain subcarriers in frequency domain for redundant symbols instead of data, in order to generate a zero word in the DFT (discrete Fourier transform) interval in time domain. These redundant symbols depend on the data loaded on the other carriers and thus introduce correlation. The...

article

Classical and Bayesian Linear Data Estimators for Unique Word OFDM

Mario Huemer, Alexander Onic, Christian Hofbauer

IEEE Transactions on Signal Processing > 2011 > 59 > 12 > 6073 - 6085

Unique word—orthogonal frequency division multiplexing (UW-OFDM) is a novel OFDM signaling concept, where the guard interval is built of a deterministic sequence—the so-called unique word—instead of the conventional random cyclic prefix. In contrast to previous attempts with deterministic sequences in the guard interval the addressed UW-OFDM signaling approach introduces correlations between the subcarrier...

article

Linear data estimators for: Classical and Bayesian approaches

Mario Huemer, Alexander Onic, Christian Hofbauer

02011 00019th European Signal Processing Conference > 2011 > 1613 - 1617

2011 19th European Signal Processing Conference

UW-OFDM (unique word - orthogonal frequency division multiplexing) is a novel OFDM signaling concept, where the guard interval is built of a deterministic sequence - the so-called unique word - instead of the conventional random cyclic prefix. In contrast to previous attempts with deterministic sequences in the guard interval, the addressed UW-OFDM signaling approach introduces correlations between...

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