Search results for: Faouzi Bellili

Items from 1 to 20 out of 39 results

article

Time Synchronization of Turbo-Coded Square-QAM-Modulated Transmissions: Code-Aided ML Estimator and Closed-Form Cramér–Rao Lower Bounds

Faouzi Bellili, Achref Methenni, Souheib Ben Amor, Sofiene Affes, more

IEEE Transactions on Vehicular Technology > 2017 > 66 > 12 > 10776 - 10792

This paper introduces a new maximum likelihood (ML) solution for the code-aided (CA) timing recovery problem in square-quadrature amplitude modulation (QAM) transmissions and derives, for the very first time, its CA Cramér–Rao lower bounds (CRLBs) in closed-form expressions. The channel is assumed to be slowly time varying so that it can be considered as constant over the observation interval. By...

article

Maximum Likelihood Time Delay Estimation From Single- and Multi-Carrier DSSS Multipath MIMO Transmissions for Future 5G Networks

Ahmed Masmoudi, Faouzi Bellili, Sofiene Affes, Ali Ghrayeb

IEEE Transactions on Wireless Communications > 2017 > 16 > 8 > 4851 - 4865

In this paper, we address the problem of time delay estimation (TDE) from single-carrier (SC) or multi-carrier (MC) direct-sequence spread spectrum (DSSS) multipath transmissions in the presence of multiple transmit and/or receive antennas that will characterize future 5G radio interface technologies (RITs), such as coded-domain nonorthogonal multiple access. We derive for the first time a closed-form...

article

Low-complexity DOA estimation from short data snapshots for ULA systems using the annihilating filter technique

Faouzi Bellili, Souheib Ben Amor, Sofiène Affes, Ali Ghrayeb

EURASIP Journal on Advances in Signal Processing > 2017 > 2017 > 1 > 1-16

This paper addresses the problem of DOA estimation using uniform linear array (ULA) antenna configurations. We propose a new low-cost method of multiple DOA estimation from very short data snapshots. The new estimator is based on the annihilating filter (AF) technique. It is non-data-aided (NDA) and does not impinge therefore on the whole throughput of the system. The noise components are assumed...

article

Code-Aided DOA Estimation From Turbo-Coded QAM Transmissions: Analytical CRLBs and Maximum Likelihood Estimator

Faouzi Bellili, Chaima Elguet, Souheib Ben Amor, Sofiene Affes, more

IEEE Transactions on Wireless Communications > 2017 > 16 > 5 > 2850 - 2865

In this paper, we address the problem of direction of arrival (DOA) estimation from turbo-coded square-QAM-modulated transmissions. We devise a new code-aware direction finding concept, derived from maximum likelihood (ML) theory, wherein the soft information provided by the soft-input soft-output decoder, in the form of log-likelihood ratios, is exploited to assist the estimation process. At each...

article

A Low-Cost and Robust Maximum Likelihood Joint Estimator for the Doppler Spread and CFO Parameters Over Flat-Fading Rayleigh Channels

Faouzi Bellili, Yassine Selmi, Sofiene Affes, Ali Ghrayeb

IEEE Transactions on Communications > 2017 > 65 > 8 > 3467 - 3478

This paper addresses the problem of Doppler spread and carrier frequency offset (CFO) estimation under flat-fading Rayleigh channels. We develop a new low-cost and robust approximate maximum likelihood (ML) estimator for these two key parameters that builds upon an elegant two-ray approximation model of the channel’s covariance matrix. The latter is then inverted analytically thereby yielding a closed-form...

chapter

Rapid prototyping and validation on an SDR platform of a low-cost hybrid ML SNR estimator over time-varying SIMO channels

Zied Ben Gamra, Faouzi Bellili, Abdelaziz Samet, Sofiene Affes

2016 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB) > 1 - 4

2016 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

An application of a rapid prototyping method on an SDR platform is presented. A novel low-cost hybrid maximum likelihood (ML)signal-to-noise ratio (SNR) estimator over single-input multiple-output (SIMO) time-varying fading channels, is implemented, tested, and validated. The approach adopted to achieve this work is modelbased. It requires no coding since it is relies on MAT-LAB/Simulink and Xilinx...

chapter

Estimation of Angular Spreads and Mean Angles of Arrival for Multiple Incoherently-Distributed Noncircular Sources

Sonia Ben Hassen, Faouzi Bellili, Abdelaziz Samet, Sofiene Affes

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB) > 1 - 5

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

In this paper, we propose a new method for the estimation of the angular parameters (i.e., central DOAs and angular spreads) of noncircular and incoherently distributed (ID) signals. Contrarily to state-of-the-art techniques, the new method exploits the additional information about the angular parameters that is carried in the unconjugated covariance matrix. Contrarily to noncircular signals, this...

chapter

Implementation of a Maximum Likelihood Doppler Spread Estimator on a Model-Based Design Platform

Adel Ati, Faouzi Bellili, Haithem Haggui, Abdelaziz Samet, more

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB) > 1 - 5

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

A new maximum likelihood (ML) Doppler spread estimator, recently shown to outperform most representative state-of-the-art solutions both in accuracy and complexity, is implemented on a FPGA-based platform. Rapid prototyping of the entire design is built as a highlevel Simulink model using Xilinx System Generator IP blocks. The RF front-end of the design is implemented using the Nutaq's model-based...

chapter

Cramer-Rao Lower Bounds for Angular Parameters Estimates from Incoherently Distributed Signals Generated by Noncircular Sources

Sonia Ben Hassen, Faouzi Bellili, Abdelaziz Samet, Sofiene Affes

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB) > 1 - 5

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

In this paper, we derive for the first time analytical expressions for the stochastic Cramér- Rao lower bound (CRLB or CRB) of the angular parameters (central DOAs and angular spreads) estimates from incoherently distributed (ID) signals generated by noncircular sources. The new CRBs of the angular parameters are compared to those obtained from circular ID signals. The CRB of the central DOAs, however,...

chapter

A Context-Aware Cognitive SIMO DL Transceiver for LTE HetNet Power Efficiency and Throughput Enhancement

Imen Mrissa, Faouzi Bellili, Sofiene Affes, Alex Stephenne

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB) > 1 - 5

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

In this paper, we propose a new single-input multiple-output (SIMO) context-aware cognitive transceiver (CTR) that is able to switch to the best performing modem in terms of link-level throughput and allows to decrease macro transmission power without loosing performances comparing to the conventional Data-aided Least Squares (DA LS) channel estimator. On the top of conventional adaptive modulation...

chapter

Context-Aware Cognitive SIMO Transceiver for Increased LTE-Downlink Link-Level Throughput

Imen Mrissa, Faouzi Bellili, Sofiene Affes, Alex Stephenne

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB) > 1 - 5

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

Coherent detection requires accurate channel estimation to provide the high data rates promised by the LTE standard. However, for high-speed wireless data transmission services, channel estimation becomes a challenging task when the pilot insertion rate becomes insufficient to allow proper tracking of the channel variation. In this paper, we design a new singleinput multiple-output (SIMO) context-...

chapter

A Context-Aware Cognitive SIMO DL Transceiver for LTE HetNet Enhanced Pico-Cell Range Expansion

Imen Mrissa, Faouzi Bellili, Sofiene Affes, Alex Stephenne

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB) > 1 - 5

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

Deploying small cells (pico, femto or relays) in a macro-cell network is an advantageous solution to increase system capacity. However, small cells usually transmit with a weaker power compared to macro-cells, this fact causes a serious interference problem for these former. Range Expansion technique is among the solutions proposed to overcome this problem. The idea is to bias the received signal...

chapter

Code-Aided Direction Finding in Turbo-Coded Square-QAM Transmissions

Faouzi Bellili, Chaima Elguet, Souheib Ben Amor, Sofiene Affes

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB) > 1 - 5

2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB)

We investigate the problem of direction of arrival (DOA) estimation from turbo-coded square-QAM- modulated signals. We propose a new code-aided (CA) maximum likelihood (ML) direction finding technique that exploits the soft information obtained from the soft-input soft-output (SISO) decoder in the form of log-likelihood ratios (LLRs). Unlike standard estimation techniques, the proposed method improves...

chapter

A context-aware cognitive SIMO transceiver for increased LTE-HetNet system-level DL-throughput

Imen Mrissa, Faouzi Bellili, Sofiene Affes, Alex Stephenne

2015 International Wireless Communications and Mobile Computing Conference (IWCMC) > 19 - 25

2015 International Wireless Communications and Mobile Computing Conference (IWCMC)

In this paper, we design a new single-input multiple-output (SIMO) context-aware cognitive transceiver (CTR) that is able to switch to the best performing modem in terms of link-level throughput. On the top of conventional adaptive modulation and coding (AMC), we allow the context-aware CTR to make best selection among three different pilot-utilization modes: conventional decision-aided (DA) or pilot-assisted,...

article

Closed-Form CRLBs for CFO and Phase Estimation From Turbo-Coded Square-QAM-Modulated Transmissions

Faouzi Bellili, Achref Methenni, Sofiene Affes

IEEE Transactions on Wireless Communications > 2015 > 14 > 5 > 2513 - 2531

In this paper, we consider the problem of joint phase and carrier frequency offset (CFO) estimation for turbo-coded systems. We derive for the first time the closed-form expressions for the exact Cramér-Rao lower bounds (CRLBs) of these estimators over turbo-coded square-QAM-modulated single- or multi-carrier transmissions. In the latter case, the derived bounds remain valid in the general case of...

chapter

Closed-form Cramer-Rao lower bounds for DOA estimation from turbo-coded square-QAM-modulated transmissions

Faouzi Bellili, Chaima Elguet, Souheib Ben Amor, Sofiene Affes, more

2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) > 3492 - 3496

ICASSP 2015 - 2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

This paper tackles the problem of the direction of arrival (DOA) estimation in turbo-coded systems. We derive for the first time the closed-form expressions for the Cramér-Rao lower bounds (CRLBs) of the code-aided (CA) DOA estimates from arbitrary square-QAM modulated signals. We succeed in factorizing the likelihood function of the system into two analogous terms linearizing thereby all the derivation...

article

Maximum Likelihood SNR Estimation of Linearly-Modulated Signals Over Time-Varying Flat-Fading SIMO Channels

Faouzi Bellili, Rabii Meftehi, Sofiene Affes, Alex Stephenne

IEEE Transactions on Signal Processing > 2015 > 63 > 2 > 441 - 456

In this paper, we tackle for the first time the problem of maximum likelihood (ML) estimation of the signal-to-noise ratio (SNR) parameter over time-varying single-input multiple-output (SIMO) channels. Both the data-aided (DA) and the non-data-aided (NDA) schemes are investigated. Unlike classical techniques where the channel is assumed to be slowly time-varying and, therefore, considered as constant...

chapter

Closed-form CRLBs for SNR estimation from turbo-coded square-QAM-modulated signals

Faouzi Bellili, Achref Methenni, Sofiene Affes

2014 IEEE Global Communications Conference > 1765 - 1771

GLOBECOM 2014 - 2014 IEEE Global Communications Conference

In this contribution, we derive for the first time the closed-form expressions for the Cramér-Rao lower bounds (CRLBs) of the signal-to-noise ratio (SNR) estimates from turbo-coded square-QAM transmissions. By exploiting the structure of the Gray mapping, we are able to factorize the likelihood function thereby linearizing all the derivation steps for the FIM elements. The analytical CRLBs coincide...

chapter

Closed-form Cramér-Rao lower bounds for CFO and phase estimation from turbo-coded square-QAM-modulated signals

Faouzi Bellili, Achref Methenni, Sofiene Affes

2014 IEEE Global Communications Conference > 4083 - 4089

GLOBECOM 2014 - 2014 IEEE Global Communications Conference

We consider the problem of joint phase and carrier frequency offset (CFO) estimation from turbo-coded square-QAM modulated signals. We derive for the first time the closed-form expressions for the exact Cramér-Rao lower bounds (CRLBs) of this estimation problem. In particular, we introduce a new recursive process that enables the construction of arbitrary Gray-coded square-QAM constellations. Some...

chapter

Code-Aided Time Synchronization of Turbo-Coded Square-QAM-Modulated Transmissions: Closed-Form Cramer-Rao Lower Bounds

Faouzi Bellili, Achref Methenni, Souheib Ben Amor, Sofiene Affes, more

2015 IEEE Global Communications Conference (GLOBECOM) > 1 - 7

GLOBECOM 2015 - 2015 IEEE Global Communications Conference

This paper tackles the problem of code-aided (CA) timing recovery in turbo-coded square-QAM transmissions. Owing to a simple recursive construction process, some hidden properties of Gray-coded (GC) square-QAM constellations are demystified and the code bits' a priori log- likelihood ratios (LLRs) are explicitly incorporated in the log-likelihood function (LLF). Then, by splitting the underlying LLF...

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Keywords

SIGNAL TO NOISE RATIO (18)
MAXIMUM LIKELIHOOD ESTIMATION (15)
ESTIMATION (13)
CHANNEL ESTIMATION (10)
QUADRATURE AMPLITUDE MODULATION (8)
CRAMéR-RAO LOWER BOUND (CRLB) (7)
DIRECTION-OF-ARRIVAL ESTIMATION (7)
TURBO CODES (7)
DECODING (6)
APPROXIMATION METHODS (5)
ARRAYS (5)
DELAY EFFECTS (5)
WIRELESS COMMUNICATION (5)
COVARIANCE MATRICES (4)
DIRECTION OF ARRIVAL ESTIMATION (4)
DOPPLER EFFECT (4)
EXTRINSIC INFORMATION (4)
GRAY MAPPING (4)
MONTE CARLO METHODS (4)
PHASE SHIFT KEYING (4)
RECEIVING ANTENNAS (4)
SYNCHRONIZATION (4)
ADDITIVE WHITE GAUSSIAN NOISE (3)
ARRAY SIGNAL PROCESSING (3)
BINARY PHASE SHIFT KEYING (3)
CODE-AIDED (CA) (3)
CORRELATION (3)
CRLB (3)
DATA-AIDED (DA) (3)
DOA ESTIMATION (3)
FREQUENCY ESTIMATION (3)
MAXIMUM LIKELIHOOD (3)
RECEIVERS (3)
THROUGHPUT (3)
VECTORS (3)
AWGN (2)
AWGN CHANNELS (2)
CARRIER FREQUENCY OFFSET (CFO) (2)
CLOSED-FORM SOLUTION (2)
CRAMER-RAO LOWER BOUND (2)
LINEARLY MODULATED SIGNALS (2)
MODULATION (2)
NDA ESTIMATION (2)
NON-DATA-AIDED (2)
NONCIRCULARITY OF THE SIGNALS (2)
OFDM (2)
OPTIMIZATION METHODS (2)
SIGNAL-TO-NOISE RATIO (SNR) (2)
SPATIAL CORRELATION (2)
SQUARE QAM (2)
SQUARE QAMS (2)
TEMPORAL CORRELATION (2)
TIMING (2)
TRANSCEIVERS (2)
TURBO/LDPC CODES (2)
2G (1)
3G (1)
5G (1)
5G MOBILE COMMUNICATION (1)
ADAPTIVE MODULATION AND CODING (AMC) (1)
ADDITIVE WHITE CIRCULAR COMPLEX GAUSSIAN NOISE (1)
ADDITIVE WHITE NOISE (1)
AMPLITUDE MODULATION (1)
ANGULAR APERTURE (1)
ANNIHILATING FILTER (1)
ANTENNA ARRAYS (1)
ANTENNAS (1)
AOAS (1)
ARBITRARY SQUARE QAM-MODULATED SIGNALS (1)
AWCCGN CHANNELS (1)
BEAMFORMING (1)
BPSK (1)
CARRIER PHASE (1)
CARRIER PHASE SHIFT (1)
CDMA2000 (1)
CFO ESTIMATION (1)
CHANNEL GAINS (1)
CLOSED-FORM EXPRESSIONS (1)
CODE-AIDED (1)
COMPUTATIONAL MODELING (1)
COVARIANCE MATRIX (1)
CRAMéR–RAO LOWER BOUND (CRLB) (1)
CRAMÉR-RAO LOWER BOUNDS (1)
CRAME??R-RAO LOWER BOUNDS (1)
CRAMER-RAO LOWER BOUNDS (1)
CRAMÉR-RAO LOWER BOUND (1)
CRAMÉR-RAO LOWER BOUND (CRLB) (1)
CRB (1)
DATA-AIDED AND CODE-AIDED ESTIMATION (1)
DATA-AIDED DOA ESTIMATION (1)
DATA-AIDED SCHEME (1)
DELAY (1)
DETECTION (1)
DIRECTION OF ARRIVAL (DOA) (1)
DOPPLER SPREAD ESTIMATION (1)
DS-CDMA (1)
DSSS (1)
ENCODING (1)
EXPECTATION MAXIMIZATION (EM) (1)
EXPECTATION-MAXIMISATION ALGORITHM (1)
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Springer (1)

INFONA - science communication portal

Search results for: Faouzi Bellili

Time Synchronization of Turbo-Coded Square-QAM-Modulated Transmissions: Code-Aided ML Estimator and Closed-Form Cramér–Rao Lower Bounds

Maximum Likelihood Time Delay Estimation From Single- and Multi-Carrier DSSS Multipath MIMO Transmissions for Future 5G Networks

Low-complexity DOA estimation from short data snapshots for ULA systems using the annihilating filter technique

Code-Aided DOA Estimation From Turbo-Coded QAM Transmissions: Analytical CRLBs and Maximum Likelihood Estimator

A Low-Cost and Robust Maximum Likelihood Joint Estimator for the Doppler Spread and CFO Parameters Over Flat-Fading Rayleigh Channels

Rapid prototyping and validation on an SDR platform of a low-cost hybrid ML SNR estimator over time-varying SIMO channels

Estimation of Angular Spreads and Mean Angles of Arrival for Multiple Incoherently-Distributed Noncircular Sources

Implementation of a Maximum Likelihood Doppler Spread Estimator on a Model-Based Design Platform

Cramer-Rao Lower Bounds for Angular Parameters Estimates from Incoherently Distributed Signals Generated by Noncircular Sources

A Context-Aware Cognitive SIMO DL Transceiver for LTE HetNet Power Efficiency and Throughput Enhancement

Context-Aware Cognitive SIMO Transceiver for Increased LTE-Downlink Link-Level Throughput

A Context-Aware Cognitive SIMO DL Transceiver for LTE HetNet Enhanced Pico-Cell Range Expansion

Code-Aided Direction Finding in Turbo-Coded Square-QAM Transmissions

A context-aware cognitive SIMO transceiver for increased LTE-HetNet system-level DL-throughput

Closed-Form CRLBs for CFO and Phase Estimation From Turbo-Coded Square-QAM-Modulated Transmissions

Closed-form Cramer-Rao lower bounds for DOA estimation from turbo-coded square-QAM-modulated transmissions

Maximum Likelihood SNR Estimation of Linearly-Modulated Signals Over Time-Varying Flat-Fading SIMO Channels

Closed-form CRLBs for SNR estimation from turbo-coded square-QAM-modulated signals

Closed-form Cramér-Rao lower bounds for CFO and phase estimation from turbo-coded square-QAM-modulated signals

Code-Aided Time Synchronization of Turbo-Coded Square-QAM-Modulated Transmissions: Closed-Form Cramer-Rao Lower Bounds

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