In this paper, an iterative enhancement of the robust Wiener filter (RWF) estimator is presented for a turbo-coded orthogonal frequency division multiplexing (OFDM) system under umbrella 3GPP long term evolution. The proposed scheme can operate with uncoded or coded feedback, and outperforms conventional linear RWF in whole signal-to-noise ratio (SNR) range both approaches. Results show that most gain obtained first iteration algorithm, better performance achieved feedback scheme. A good...

5G New Radio (NR) incorporates numerous beam-based novel features such as beam management procedures for selecting the best serving gNB beam, recovery from failures, inter-cell mobility support and advanced UEs with multiple directional panels. In this paper, we study joint performance of all these techniques a macro cellular scenario at 28 GHz special emphasis on how UE antenna design influences system-level performance. It is shown that full benefits can be delivered introduction panels...

Modelling and managing user-induced rotation blockage in handheld multi-antenna panel devices are some of the pivotal challenges future narrow beam millimeter wave (mmWave) communications. While studies have been conducted separately on multi-panel management (BM) performance mmWave user loss, no study has made to date, best authors' knowledge, how hand influences alignment accuracy context 5G new radio (NR). This paper presents a link-level evaluation impact grip BM under NR standard...

5th Generation (5G) millimeter wave (mmWave) communications rely on directive and narrow beams to circumvent its challenging propagation conditions. Therefore, Medium Access Control (MAC)-based Beam Management (BM) becomes essential secure adequate beam alignment between the User Equipment (UE) Next Node Base Station (gNodeB) beams. For dynamic environments, this can be challenging, potentially compromising control procedures such as Tracking (BT) under current 5G New Radio (NR) deployments...

This paper evaluates spectral efficiency performance of the 3GPP Evolved UTRA (E-UTRA) downlink with baseline settings. A detailed link level tool has been developed including majority E-UTRA chain processing modules such as time-domain adaptation and LI HARQ. Since MIMO is an integral part new system, we include four basic multiple antenna configurations in analysis, namely SISO, 1x2 SIMO, 2x2 SFC BLAST schemes. very sensitive to channel estimation error cell edge, a case denoted adapMIMO...

In this paper we present a refined model of the wireless multipath channel along with thorough analysis on impact spatial smoothing techniques when used for improved estimation. The state-of-the-art estimation algorithm pilot-aided OFDM systems is robustly designed and operates without knowledge time-varying propagation delays in channel. However, algorithms exploiting these delay parameters can outperform solution. We demonstrate from simulations how Unitary ESPRIT together exhibit...

We propose an iterative algorithm for orthogonal frequency-division multiplexing (OFDM) receivers operating over fast time-varying channels. The design relies on the assumptions that channel response can be characterized by a few nonnegligible separable multipath components and temporal variation of each component gain well with basis expansion model (BEM) using small number terms. As result, estimation problem is posed as estimating vector complex coefficients exhibits block-sparse...

This paper presents an extension of the Cognitive Pilot Channel (CPC) concept to case a distributed version thereof (namely, DCPC), and demonstrates potential instantiation this in design Smart Femto-Cell Controllers (SFC-C) for handling management co-existing homogeneous or heterogeneous networks. Instead covering various networks by single CPC, novel idea consists deploying CPC transmission way within each individual Femto Cell (SFC) controlled Composite Networks (CNs), example which can...

Several Medium Access Control (MAC) based beam management procedures have been adopted in the 3rd Generation Partnership Project (3GPP) to support beam-based communication 5G New Radio (NR). These connected mode functionalities include tracking, failure detection and recovery. This paper provides a detailed system-level performance analysis of for Frequency Range 1 (FR1) macro-cellular environments. Assumptions which are left open User Equipment (UE) implementation also discussed. Extensive...

In this paper, we present a novel iterative receiver for MIMO-OFDM systems with synchronous interferers. The is derived based on the Kullback-Leibler divergence minimization framework, and combines channel estimation, interference cancellation residual noise estimation in an manner. By using both pilot data symbols, estimator improves accuracy of estimates each iteration, which leads to more effective detection process. A performance evaluation Monte-Carlo simulations shows that proposed...

Propagation channels with maximum excess delay exceeding the duration of cyclic prefix (CP) in OFDM systems cause intercarrier and intersymbol interference which, unless accounted for, degrade receiver performance. Using tools from Bayesian inference sparse signal reconstruction, we derive an iterative algorithm that estimates approximate representation channel impulse response noise variance, cancels intrinsic decodes data over a block symbols. Simulation results show employing our...

In this paper, we present a novel approach for pilot-aided channel estimation in OFDM systems with synchronous co-channel interference. The estimator is derived based on the Kullback-Leibler divergence minimization framework. obtained solution iteratively updates both desired user's and interferer's channels, using combination of linear minimum mean squared-error (LMMSE) filtering interference cancellation, avoiding complex matrix inversions involved full LMMSE approach. Estimation noise...

Traditionally, the dictionary matrices used in sparse wireless channel estimation have been based on discrete Fourier transform, following assumption that frequency response (CFR) can be approximated as a linear combination of small number multipath components, each one being contributed by specific propagation path. In practical communication systems, however, experienced receiver includes additional effects to those induced channel. This composite embodies, particular, impact transmit...

In this paper, we present a thorough investigation on the impact of spatial smoothing and forward-backward averaging techniques for subspace-based channel estimation. The technique requires selection window size, which, if not selected properly, leads to dramatically performance breakdown methods. We aim provide an explanation drop certain sizes subsequently understanding proper size selection. particular, describe behavior magnitude least signal eigenvalue as function employed. Through...

The paper presents two iterative multiuser detection and channel estimation (JDE) receivers of tractable complexity for downlink transmission using beamforming. results from an application the space-alternating generalized expectation-maximization (SAGE) algorithm a modified version. proposed JDE schemes update parameters in parallel re-estimates users' symbols successive order. Monte Carlo simulations frequency-selective scenario show that are robust against errors coefficients.

This paper presents a generic hardware-accelerated OFDM simulator. Firstly, and reusable system simulator is proposed. The simulator, implemented with Matlab, supports several channel models estimation techniques. Secondly, the execution time of proposed optimized. For this purpose, on FPGA platform by means Celoxica's Handel-C to methodology. Our experimental results show that provides accurate up 7 times faster than pure software Matlab.

In this paper, the effects of phase noise on spectral efficiency next generation OFDM based mobile systems with channel estimation is investigated. The simulation context and parameter settings are taken from 3GPP Evolved UTRA (E-UTRA) study item, focusing an downlink single antenna system in 20 MHz bandwidth. Phase modeled as a Wiener-Levy process several powers evaluated. coherent detection method pilot assisted (PACE) Wiener frequency domain interpolation second order Gaussian for time...

This paper studies common linear frequency direction pilot- symbol aided channel estimation algorithms for orthogonal division multiplexing in a UTRA long term evolution context. Three deterministic are analyzed: the maximum likelihood (ML) approach, noise reduction algorithm (NRA) and robust Wiener (RW) filter. A closed form mean squared error is provided these three algorithms. Analytical simulation results show that, presence of virtual subcarriers, ML can suffer large performance...

A critical challenge for 5G is transitioning to the mm-Wave spectrum. Despite providing unprecedented data rates, mm-Waves also suffer high path loss, atmospheric absorption, and higher fluctuating channel conditions, sparking numerous paradigm shifts in smartphone industry. Extending communications smartphones requires first a comprehensive study identify antenna design/smartphone implementation challenges that impact quality of communications. This work proposes two-step assessment metric,...

We design an algorithm for OFDM receivers operating in co-channel interference conditions, where the serving and interfering transmitters are synchronized time. The channel estimation problem is formulated as one of sparse signal reconstruction using multiple measurement vectors. proposed harnesses common support of, respectively, desired MIMO sub-channels by adopting a Bernoulli-Gaussian prior weights impulse responses these sub-channels. Then, applying variational Bayesian inference method...

5th Generation (5G) millimeter wave (mmWave) communications are enabled through directive and narrow beams that mitigate these frequencies' challenging propagation conditions. In the future, 5G-Advanced 6G will go even higher in frequency spectrum, to allow for progressively larger bandwidths. The need a number of narrower put strain current analog beamforming (BF) based beam management (BM) framework. This paper proposes an alternative signalling method BM parallelize sweeping procedure...

The contribution focuses on the accuracy of two asymptotic solutions aimed at representing electromagnetic field scattered by penetrable wedges. One is a heuristic manipulation solution for perfect electrical conductor, and other one more rigorous coefficient based approximate boundary conditions. results presented here extend those proposed authors illustrating such edge validity uniform theory diffraction. In particular, they show that formulation can be freely applied in similar...