Sladjana Josilo - Academia.edu (original) (raw)

Papers by Sladjana Josilo

Outgoing from the known uniform FBMC (Filter-Bank Multi-Carrier) formats with Nyquist spectral sh... more Outgoing from the known uniform FBMC (Filter-Bank Multi-Carrier) formats with Nyquist spectral shaped sub-channels and its time-frequency dual Time-Limited Orthogonal (TLO) form, we introduce an orthogonal frequency division multiplex of non-uniformly spaced and unequal-width sub-channels. The goal is to attain potential gains in using relatively small number of sub-channels, but still allow for frequency gaps needed for channelization with a small decrease in overall spectral efficiency. The orthogonality conditions are evaluated through simulations using the extended OFDM framework, whereby the corresponding referent filter-bank impulse responses are defined in frequency-domain by straightforward aggregations of the pertaining uniform filter-bank sub-channels spectral shapes (for conventional FBMC with frequency limited sub-channels spectra), and by transforming to frequency-domain of adequately aggregated time-limited referent impulse responses of uniform TLO configuration. An an...

2014 11th International Symposium on Wireless Communications Systems (ISWCS), 2014

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 cochannel 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.

EURASIP Journal on Advances in Signal Processing, 2014

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.

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.

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.

2014 11th International Symposium on Wireless Communications Systems (ISWCS), 2014

EURASIP Journal on Advances in Signal Processing, 2014

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.

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.