Papers by Milan Narandzic
This paper evaluates the performance of widely linear filtering based equalization for suppressio... more This paper evaluates the performance of widely linear filtering based equalization for suppression of kindred co-channel interference. The presented approach is extension of the MMSE method proposed for ICI/ISI compensation for OQAM/FBMC transmission system in [1][2]. The analysis and computer simulation results show the relevance of widely linear filtering based equalization approach when the interfering signal exhibit improper statistics. This indicates the need to consider alternative forms of I/Q staggered multicarrier waveforms for 5G standardization that differs from the conventional one with 100% roll-off subchannels.
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Starting from the well-known uniform filter bank multicarrier (FBMC) format with Nyquist spectral... more Starting from the well-known uniform filter bank multicarrier (FBMC) format with Nyquist spectral shaping of
frequency-limited orthogonal (FLO) subchannels and its dual time-frequency, time-limited orthogonal (TLO) form,
we introduce an orthogonal frequency division multiplex of nonuniformly spaced subchannels with unequal width.
The orthogonality conditions for nonuniform FBMC (Nu-FBMC) were evaluated through simulations using the ‘extended
orthogonal frequency division multiplexing (OFDM)’ framework, as well as through analytical derivation in a rather
pragmatic manner. The referent filter bank impulse responses were defined in frequency domain by straightforward
aggregations of the pertaining uniform filter bank subchannels spectral shapes for FLO and by transforming the
frequency domain of appropriately aggregated time-limited referent impulse responses of uniform TLO configuration.
Nonsymmetrical spectral shaping of subchannels in the FLO case format has also been proposed. The spectral efficiency
has been evaluated in the presence of nonlinear distortions caused by high power amplifier (HPA), and results have been
given in accordance with power spectral density (PSD) constraints defined by IEEE 802.11a standard.
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2011 IEEE 73rd Vehicular Technology Conference (VTC Spring), 2011
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42nd Midwest Symposium on Circuits and Systems (Cat. No.99CH36356), 2000
A newly developed type of stochastic A/D converter is presented and the influence of dither perfo... more A newly developed type of stochastic A/D converter is presented and the influence of dither performances on its limit precision is analyzed. A class of high quality random number generators for short-interval measurements is introduced and the reduction of difference between theoretical and simulated values of error was established
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2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring, 2007
AbstractThis paper is summarizing and comparing properties of channel models used for Beyond-3G ... more AbstractThis paper is summarizing and comparing properties of channel models used for Beyond-3G (B3G) MIMO simulations: 3GPP Spatial Channel Model (SCM), its extension (SCME), and models developed by WINNER. Compared models are offering complete ...
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This paper proposes 2x2 MIMO OQAM/FBMC receiver strategy based on successive interference cancell... more This paper proposes 2x2 MIMO OQAM/FBMC receiver strategy based on successive interference cancellation (SIC) as an extension of the SISO approach which uses entirely real-valued formulation of the transmission system model]. Both increase of throughput and SNR gain are observed through appropriate maximum ratio combining (MRC) of the soft symbols pertaining to the receiver-end diversity branches. The 2x1 multi-user detection (MUD) case has been also addressed to certain extent. Additional gains, essentially related to SISO case, coming from the cooperative use of in-phase (I) and quadrature (Q) branches, primarily based on the quadrature noise components’ independence, as well as from the explicit noise cancellation within the SIC framework, have also been outlined.
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2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications, 2007
Interdependences of radio-channel model parameters, being observed in some measurement data, shou... more Interdependences of radio-channel model parameters, being observed in some measurement data, should be reproduced by the model. For that purpose the statistical correlation is often used. From the same wideband multiple-input and multiple-output (MIMO) channel data, ...
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2010 IEEE 71st Vehicular Technology Conference, 2010
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2011 IEEE 73rd Vehicular Technology Conference (VTC Spring), 2011
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VTC Spring 2009 - IEEE 69th Vehicular Technology Conference, 2009
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Signals and Communication Technology, 2011
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2007 16th IST Mobile and Wireless Communications Summit, 2007
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2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring, 2007
AbstractThe IST-WINNER channel model (WIM) offers a complete channel model description in a sens... more AbstractThe IST-WINNER channel model (WIM) offers a complete channel model description in a sense of large-scale as well as small-scale effects in MIMO radio-channel for B3G system designs. This paper proposes the extension of 1D regular array structures being currently ...
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ABSTRACT The stochastic equivalence with the realistic radio propagation environment is a crucial... more ABSTRACT The stochastic equivalence with the realistic radio propagation environment is a crucial assumption behind geometry-based stochastic channel models (GSCM). Within the 3GPP SCM and WINNER models, the global properties of the underlying stochastic process are expressed by Large-Scale Parameters (LSP), describing the distribution of the transmitted power over different dimensions of the channel. In this paper, we perform the characterization of Large-Scale Parameters within Dresden, Germany. The investigated environment with given antenna deployment can be classified as urban macro cell. The obtained parameters are compared with the corresponding WINNER II/+ parameters. In this way we validate the WINNER model, but also empirically verify how much variation within the same scenario can be expected when measurements are performed in different cities. I. INTRODUCTION The MIMO concept is expected to significantly increase transfer rates and the reliability or power efficiency. However the realistic performance of MIMO systems can be properly investigated only if antenna inter-correlation is properly represented. For a given antenna arrays the average correlations-levels could be explicitly expressed. In this paper we will, however, analyse antenna independent geometry- based models where correlations are implicitly contained in the multi-path realizations. The characterization of every multi-path component requires multiple parameters (delay, directions of departure and arrival, polarization-dependent weights, and Doppler shift). Resolving the multipath components allows antenna de-embedding and independent characterization of propagation channel. In the analysed model, individual multi-path components are described jointly by clustering them and then describing the global position of clusters in the multidimensional space with aid of Large-Scale Parameters. Although a channel characterization relies upon different parameters, in this paper we focus to the group of so called Large-Scale Parameters (LSPs), whose variations become significant only after several tenths of wavelengths. These parameters are capturing gradual changes in the structure (angles, delays, powers …) of multipath (opposite to small- scale signal fading due to interference between multipath components). Within the modelling context LSPs govern evolution of the synthesized channel, however their significance is not limited to that purpose only. Since LSPs show strong correlation with system performance indicators (e.g. BER) they could be employed for system performance evaluation or adaptation of transmission parameters on radio-link (1). The Large-Scale Parameter statistics are obtained from MIMO channel measurements and appropriate post processing procedures. Empirically obtained probability density functions of LSPs are approximated with simple analytical distributions. The relevance of obtained model will be associated with the amount of gathered LSP realizations: in order to claim that the model represents the whole urban scenario, it is necessary to perform extensive measurements in a corresponding environment. If so, it is expected that model predictions will be close to other environments. The paper is organized as follows: the second section describes the performed MIMO channel sounding; the third section specifies the parameter extraction procedure. In section IV, results are presented and compared with reference WINNER parameters. Within the last section conclusions are given.
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ABSTRACT In configurations with spatially distributed communication sources a receiving terminal ... more ABSTRACT In configurations with spatially distributed communication sources a receiving terminal simultaneously receives multiple signals. Due to the receiver's limited dynamic range, a receiver's perception of any particular radio-link will depend on the total power received from all links. In this respect, the problem at hand has parallels with the well-known near-far problem in the uplink of CDMA systems. In this contribution, a strategy of joint representation of distributed/cooperative wideband MIMO channels with common sink is proposed. The approach is based on the observation that perception of Large-Scale model parameters, like spreads, depends on the effective dynamic range. Due to the differences in the peak power levels of the cooperative links, the effective dynamic range for the weaker links will be lower and, therefore, values of Large-Scale channel parameters should be adjusted accordingly. The proposed solution requires that the distribution of the peak power level differences is statistically characterised for particular multi-link configurations. This is then used to modify the distributions of the Large-Scale parameters to account for the limited dynamic range of the receiver. The relevant dependences between Large-Scale parameters are illustrated for a multi-cell configuration, using measurements conducted in Ilmenau during 2008.
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Proceedings of the 5th Seminar on Neural Network Applications in Electrical Engineering. NEUREL 2000 (IEEE Cat. No.00EX287), 2000
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Papers by Milan Narandzic
frequency-limited orthogonal (FLO) subchannels and its dual time-frequency, time-limited orthogonal (TLO) form,
we introduce an orthogonal frequency division multiplex of nonuniformly spaced subchannels with unequal width.
The orthogonality conditions for nonuniform FBMC (Nu-FBMC) were evaluated through simulations using the ‘extended
orthogonal frequency division multiplexing (OFDM)’ framework, as well as through analytical derivation in a rather
pragmatic manner. The referent filter bank impulse responses were defined in frequency domain by straightforward
aggregations of the pertaining uniform filter bank subchannels spectral shapes for FLO and by transforming the
frequency domain of appropriately aggregated time-limited referent impulse responses of uniform TLO configuration.
Nonsymmetrical spectral shaping of subchannels in the FLO case format has also been proposed. The spectral efficiency
has been evaluated in the presence of nonlinear distortions caused by high power amplifier (HPA), and results have been
given in accordance with power spectral density (PSD) constraints defined by IEEE 802.11a standard.
frequency-limited orthogonal (FLO) subchannels and its dual time-frequency, time-limited orthogonal (TLO) form,
we introduce an orthogonal frequency division multiplex of nonuniformly spaced subchannels with unequal width.
The orthogonality conditions for nonuniform FBMC (Nu-FBMC) were evaluated through simulations using the ‘extended
orthogonal frequency division multiplexing (OFDM)’ framework, as well as through analytical derivation in a rather
pragmatic manner. The referent filter bank impulse responses were defined in frequency domain by straightforward
aggregations of the pertaining uniform filter bank subchannels spectral shapes for FLO and by transforming the
frequency domain of appropriately aggregated time-limited referent impulse responses of uniform TLO configuration.
Nonsymmetrical spectral shaping of subchannels in the FLO case format has also been proposed. The spectral efficiency
has been evaluated in the presence of nonlinear distortions caused by high power amplifier (HPA), and results have been
given in accordance with power spectral density (PSD) constraints defined by IEEE 802.11a standard.