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Research paper thumbnail of Output SNR analysis and detection criteria for optimum DCT-based multicarrier system

2016 International Symposium on Wireless Communication Systems (ISWCS), Sep 1, 2016

Research paper thumbnail of Equalization and Decoding Algorithms in Broadband Fixed Wireless Access

ACIT-Communication Systems, 2005

EQUALIZATION AND DECODING ALGORITHMS IN BROADBAND FIXED WIRELESS ACCESS Pei Xiao, Rolando Carrasc... more EQUALIZATION AND DECODING ALGORITHMS IN BROADBAND FIXED WIRELESS ACCESS Pei Xiao, Rolando Carrasco School of Electrical ... Also, two alternatives of interfacing equalizer and chan-nel decoder, namely partitioned approach and integrated approach are ...

Research paper thumbnail of Maximum Likelihood Optimization of Adaptive Asynchronous Interference Mitigation Beamformer

IEEE Transactions on Signal Processing, 2021

Research paper thumbnail of Joint Sparse Graph for FBMC/OQAM Systems

IEEE Transactions on Vehicular Technology, Jul 1, 2018

Research paper thumbnail of Limited-Fronthaul Cell-Free Massive MIMO With Local MMSE Receiver Under Rician Fading and Phase Shifts

IEEE Wireless Communications Letters, Sep 1, 2021

Research paper thumbnail of Memory-Full Context-Aware Predictive Mobility Management in Dual Connectivity 5G Networks

Research paper thumbnail of Deep Reinforcement Learning-based Sum Rate Fairness Trade-off for Cell-Free mMIMO

IEEE Transactions on Vehicular Technology, 2022

Research paper thumbnail of Evaluation of Low Complexity Massive MIMO Techniques Under Realistic Channel Conditions

arXiv (Cornell University), Jul 3, 2019

Research paper thumbnail of Radio Resource Allocation for Multicarrier Low-Density-Spreading Multiple Access

IEEE Transactions on Vehicular Technology, Mar 1, 2017

Research paper thumbnail of NOMA/OMA Mode Selection-Based Cell-Free Massive MIMO

Research paper thumbnail of Max–Min Rate of Cell-Free Massive MIMO Uplink With Optimal Uniform Quantization

IEEE Transactions on Communications, Oct 1, 2019

Research paper thumbnail of On the Energy Efficiency of Limited-Backhaul Cell-Free Massive MIMO

Research paper thumbnail of Game Theory Based Radio Resource Allocation for Full-Duplex Systems

Research paper thumbnail of Exploiting Deep Learning in Limited-Fronthaul Cell-Free Massive MIMO Uplink

IEEE Journal on Selected Areas in Communications, Aug 1, 2020

Research paper thumbnail of Predictive Base Station Activation in Futuristic Energy-Efficient Control/Data Separated RAN

Research paper thumbnail of Deep Reinforcement Learning-based Power Allocation in Uplink Cell-Free Massive MIMO

2022 IEEE Wireless Communications and Networking Conference (WCNC)

Research paper thumbnail of MU-UFMC System Performance Analysis and Optimal Filter Length and Zero Padding Length Design

Universal filtered multi-carrier (UFMC) systems offer a flexibility of filtering arbitrary number... more Universal filtered multi-carrier (UFMC) systems offer a flexibility of filtering arbitrary number of subcarriers to suppress out of band (OoB) emission, while keeping the orthogonality between subbands and subcarriers within one subband. However, subband filtering may affect system performance and capacity in a number of ways. In this paper, we first propose the conditions for interference-free one-tap equalization and corresponding signal model in the frequency domain for multi-user (MU) UFMC system. Based on this ideal interference-free case, impact of subband filtering on the system performance is analyzed in terms of average signal-to-noise ratio (SNR) per subband, capacity per subcarrier and bit error rate (BER) and compared with the orthogonal frequency division multiplexing (OFDM) system. This is followed by filter length selection strategies to provide guidelines for system design. Next, by taking carrier frequency offset (CFO), timing offset (TO), insufficient guard interva...

Research paper thumbnail of Multi-Service Signal Multiplexing and Isolation for Physical-Layer Network Slicing (PNS)

2017 IEEE 86th Vehicular Technology Conference (VTC-Fall), 2017

Research paper thumbnail of On the Performance of Reconfigurable Intelligent Surface-Aided Cell-Free Massive MIMO Uplink

GLOBECOM 2020 - 2020 IEEE Global Communications Conference, 2020

The uplink of a reconfigurable intelligent surfaces (RIS)-aided cell-free massive multiple-input ... more The uplink of a reconfigurable intelligent surfaces (RIS)-aided cell-free massive multiple-input multiple-output (MIMO) system is analyzed, where the channel state information (CSI) is estimated using uplink pilots. First, we derive analytical expressions for the achievable rate of the system with zero forcing (ZF) receiver, taking into account the effects of pilot contamination, channel estimation error and the distributed RISs. The max-min rate optimization problem is considered with per-user power constraints. To solve this non-convex problem, we propose to decouple the original optimization problem into two sub-problems, namely, phase shift design problem and power allocation problem. The power allocation problem is solved using a standard geometric programming (GP) whereas a semidefinite programming (SDP) is utilized to design the phase shifts. Moreover, the Taylor series approximation is used to convert the nonconvex constraints into a convex form. An iterative algorithm is proposed whereby at each iteration, one of the sub-problems is solved while the other design variable is fixed. The max-min user rate of the RIS-aided cell-free massive MIMO system is compared to that of conventional cell-free massive MIMO. Numerical results indicate the superiority of the proposed algorithm compared with a conventional cell-free massive MIMO system. Finally, the convergence of the proposed algorithm is investigated.

Research paper thumbnail of Interference Analysis of QAM based Filter Bank Multicarrier System with Index Modulation

arXiv: Signal Processing, 2018

Index modulation (IM) has recently emerged as a promising concept for spectrum and energy-efficie... more Index modulation (IM) has recently emerged as a promising concept for spectrum and energy-efficient next generation wireless communications systems since it strikes a good balance among error performance, complexity, and spectral efficiency. IM technique, when applied to multicarrier waveforms, yields the ability to convey the information not only by M-ary signal constellations as in conventional multicarrier systems but also by the indexes of the subcarriers, which are activated according to the incoming bit stream. Although IM is well studied for OFDM based systems, FBMC with index modulation has not been thoroughly investigated. In this paper, we shed light on the potential and implementation of IM technique for QAM based FBMC system. We start with a mathematical model of the IM based QAM-FBMC system (FBMC/QAM-IM) along with the derivation of interference terms at the receiver due to channel distortions and noise. The interference terms including the ones introduced by the multip...

Research paper thumbnail of Output SNR analysis and detection criteria for optimum DCT-based multicarrier system

2016 International Symposium on Wireless Communication Systems (ISWCS), Sep 1, 2016

Research paper thumbnail of Equalization and Decoding Algorithms in Broadband Fixed Wireless Access

ACIT-Communication Systems, 2005

EQUALIZATION AND DECODING ALGORITHMS IN BROADBAND FIXED WIRELESS ACCESS Pei Xiao, Rolando Carrasc... more EQUALIZATION AND DECODING ALGORITHMS IN BROADBAND FIXED WIRELESS ACCESS Pei Xiao, Rolando Carrasco School of Electrical ... Also, two alternatives of interfacing equalizer and chan-nel decoder, namely partitioned approach and integrated approach are ...

Research paper thumbnail of Maximum Likelihood Optimization of Adaptive Asynchronous Interference Mitigation Beamformer

IEEE Transactions on Signal Processing, 2021

Research paper thumbnail of Joint Sparse Graph for FBMC/OQAM Systems

IEEE Transactions on Vehicular Technology, Jul 1, 2018

Research paper thumbnail of Limited-Fronthaul Cell-Free Massive MIMO With Local MMSE Receiver Under Rician Fading and Phase Shifts

IEEE Wireless Communications Letters, Sep 1, 2021

Research paper thumbnail of Memory-Full Context-Aware Predictive Mobility Management in Dual Connectivity 5G Networks

Research paper thumbnail of Deep Reinforcement Learning-based Sum Rate Fairness Trade-off for Cell-Free mMIMO

IEEE Transactions on Vehicular Technology, 2022

Research paper thumbnail of Evaluation of Low Complexity Massive MIMO Techniques Under Realistic Channel Conditions

arXiv (Cornell University), Jul 3, 2019

Research paper thumbnail of Radio Resource Allocation for Multicarrier Low-Density-Spreading Multiple Access

IEEE Transactions on Vehicular Technology, Mar 1, 2017

Research paper thumbnail of NOMA/OMA Mode Selection-Based Cell-Free Massive MIMO

Research paper thumbnail of Max–Min Rate of Cell-Free Massive MIMO Uplink With Optimal Uniform Quantization

IEEE Transactions on Communications, Oct 1, 2019

Research paper thumbnail of On the Energy Efficiency of Limited-Backhaul Cell-Free Massive MIMO

Research paper thumbnail of Game Theory Based Radio Resource Allocation for Full-Duplex Systems

Research paper thumbnail of Exploiting Deep Learning in Limited-Fronthaul Cell-Free Massive MIMO Uplink

IEEE Journal on Selected Areas in Communications, Aug 1, 2020

Research paper thumbnail of Predictive Base Station Activation in Futuristic Energy-Efficient Control/Data Separated RAN

Research paper thumbnail of Deep Reinforcement Learning-based Power Allocation in Uplink Cell-Free Massive MIMO

2022 IEEE Wireless Communications and Networking Conference (WCNC)

Research paper thumbnail of MU-UFMC System Performance Analysis and Optimal Filter Length and Zero Padding Length Design

Universal filtered multi-carrier (UFMC) systems offer a flexibility of filtering arbitrary number... more Universal filtered multi-carrier (UFMC) systems offer a flexibility of filtering arbitrary number of subcarriers to suppress out of band (OoB) emission, while keeping the orthogonality between subbands and subcarriers within one subband. However, subband filtering may affect system performance and capacity in a number of ways. In this paper, we first propose the conditions for interference-free one-tap equalization and corresponding signal model in the frequency domain for multi-user (MU) UFMC system. Based on this ideal interference-free case, impact of subband filtering on the system performance is analyzed in terms of average signal-to-noise ratio (SNR) per subband, capacity per subcarrier and bit error rate (BER) and compared with the orthogonal frequency division multiplexing (OFDM) system. This is followed by filter length selection strategies to provide guidelines for system design. Next, by taking carrier frequency offset (CFO), timing offset (TO), insufficient guard interva...

Research paper thumbnail of Multi-Service Signal Multiplexing and Isolation for Physical-Layer Network Slicing (PNS)

2017 IEEE 86th Vehicular Technology Conference (VTC-Fall), 2017

Research paper thumbnail of On the Performance of Reconfigurable Intelligent Surface-Aided Cell-Free Massive MIMO Uplink

GLOBECOM 2020 - 2020 IEEE Global Communications Conference, 2020

The uplink of a reconfigurable intelligent surfaces (RIS)-aided cell-free massive multiple-input ... more The uplink of a reconfigurable intelligent surfaces (RIS)-aided cell-free massive multiple-input multiple-output (MIMO) system is analyzed, where the channel state information (CSI) is estimated using uplink pilots. First, we derive analytical expressions for the achievable rate of the system with zero forcing (ZF) receiver, taking into account the effects of pilot contamination, channel estimation error and the distributed RISs. The max-min rate optimization problem is considered with per-user power constraints. To solve this non-convex problem, we propose to decouple the original optimization problem into two sub-problems, namely, phase shift design problem and power allocation problem. The power allocation problem is solved using a standard geometric programming (GP) whereas a semidefinite programming (SDP) is utilized to design the phase shifts. Moreover, the Taylor series approximation is used to convert the nonconvex constraints into a convex form. An iterative algorithm is proposed whereby at each iteration, one of the sub-problems is solved while the other design variable is fixed. The max-min user rate of the RIS-aided cell-free massive MIMO system is compared to that of conventional cell-free massive MIMO. Numerical results indicate the superiority of the proposed algorithm compared with a conventional cell-free massive MIMO system. Finally, the convergence of the proposed algorithm is investigated.

Research paper thumbnail of Interference Analysis of QAM based Filter Bank Multicarrier System with Index Modulation

arXiv: Signal Processing, 2018

Index modulation (IM) has recently emerged as a promising concept for spectrum and energy-efficie... more Index modulation (IM) has recently emerged as a promising concept for spectrum and energy-efficient next generation wireless communications systems since it strikes a good balance among error performance, complexity, and spectral efficiency. IM technique, when applied to multicarrier waveforms, yields the ability to convey the information not only by M-ary signal constellations as in conventional multicarrier systems but also by the indexes of the subcarriers, which are activated according to the incoming bit stream. Although IM is well studied for OFDM based systems, FBMC with index modulation has not been thoroughly investigated. In this paper, we shed light on the potential and implementation of IM technique for QAM based FBMC system. We start with a mathematical model of the IM based QAM-FBMC system (FBMC/QAM-IM) along with the derivation of interference terms at the receiver due to channel distortions and noise. The interference terms including the ones introduced by the multip...

Research paper thumbnail of Rate-Splitting for Overloaded Multigroup Multicast: Error Performance Evaluation

IEEE International Conference on Communications , 2020

In this work, we provide the first attempt to evaluate error performance of Rate-Splitting (RS) b... more In this work, we provide the first attempt to evaluate error performance of Rate-Splitting (RS) based transmission strategies with constellation-constrained coding/modulation. The consider scenario is an overloaded multigroup multicast, where RS can mitigate the inter-group interference thus achieve a better max-min fair group rate over conventional transmission strategies. We bridge the RS-based rate optimization with modulation-coding scheme selection, and implement them in a developed transceiver framework with either linear or non-linear receiver, where the latter equips with a generalized sphere decoder. Simulation results of a coded bit error rate demonstrate that, while the conventional strategies suffer from the error floor in the considered scenario, the RS-based strategy delivers a superior performance even with low complexity receiver techniques. The proposed analysis, transceiver framework and evaluation methodology provide a generic baseline solution to validate the effectiveness of the RS-based system design in practice. Index Terms-Rate-splitting, overloaded system, multigroup multicast, rank-deficient, generalized sphere decoder, coded bit error rate.

Research paper thumbnail of Low-Profile Vertically Polarized Wearable Antenna with Omni-Directional Radiation

IEEE AP-S/URSI Conference, 2020

In this paper, a single-layer planar antenna with vertical polarization and omni-directional radi... more In this paper, a single-layer planar antenna with vertical polarization and omni-directional radiation is proposed for wearable applications. The antenna consists of two identical shorted patches which are face-to-face located and fed by a microstrip line at the center. Due to the structural symmetry, the current distribution and electric-field distribution are symmetrical regarding the feed, which result in vertical linear polarization normal to the antenna and omni-directional radiation pattern in the azimuthal plane. To verify the design concept, an antenna prototype operating at 2.45 GHz is designed, fabricated and tested. Measured results concur well with the simulations, showing that the antenna has a good impedance matching, omni-directional radiation pattern, and vertical polarization in the band of interest. The proposed antenna can be a good candidate for wearable and other wireless communication systems.

Research paper thumbnail of Multiple-Beam mmW-Slotted-Waveguide Leaky Wave Antenna with Control on Polarization

IEEE AP-S/URSI Conference, 2020

By performing the Floquet-mode analysis of a periodic slotted waveguide, a multiple-beam leaky wa... more By performing the Floquet-mode analysis of a periodic slotted waveguide, a multiple-beam leaky wave antenna is proposed in the millimetre-wave (mmW) band. Considering the direction of surface current lines on the broad/side-walls of the waveguide, the polarization of constructed beams are also controlled. The simulation results are well matched with the initial mathematical analysis.

Research paper thumbnail of Cross Z-Complementary Pairs (CZCPs) for Optimal Training in Broadband Spatial Modulation Systems

IEEE International Symposium on Information Theory, 2020

Spatial modulation (SM) is a new multiple-input multiple-output (MIMO) paradigm in which only one... more Spatial modulation (SM) is a new multiple-input multiple-output (MIMO) paradigm in which only one transmit antenna is activated over every symbol duration. So far, efficient SM training sequences (different from the existing design for conventional MIMO systems) remain largely open. Motivated by this research problem, we introduce a novel class of sequence pairs, called "cross Z-complementary pairs (CZCPs)", each displaying zero-correlation zone (ZCZ) properties for both their aperiodic autocorrelation sums and crosscorrelation sums. A CZCP may be transmitted in two non-orthogonal SM channels and hence proper design should be conducted to minimize the cross-interference of the two constituent sequences. We construct perfect CZCPs based on selected Golay complementary pairs. We show that the training sequences derived from our proposed CZCPs lead to optimal channel estimation performance over frequency-selective SM channels.