Cognitive Radio (CR) is of great interest to technologists because of significantly increasing the spectrum efficiency. The Secondary user (SU) which is the unlicensed user must constantly study the actions of Primary user (PU), which is the licensed user. The location information of PU can enable several key functions of CR networks, such as aiding spectrum policy enforcement, intelligent loca...

In this paper, we propose multi-input multi-output (MIMO) beamforming designs towards joint radar sensing and multi-user communications. We employ the Cram\'er-Rao bound (CRB) as a performance metric of target estimation, under both point extended scenarios. then minimizing CRB while guaranteeing pre-defined level signal-to-interference-plus-noise ratio (SINR) for each communication user. For s...

Efficient estimation of line spectral from quantized samples is significant importance in information theory and signal processing, e.g., channel energy efficient massive MIMO systems direction arrival estimation. The goal this paper to recover the as well its corresponding parameters including model order, frequencies amplitudes heavily samples. To end, we propose an grid-less Bayesian algorit...

Certain blind channel estimation techniques allow the identification of the channel up to a scale or phase factor. This results in singularity of the Fisher Information Matrix (FIM). The Cramér–Rao Bound, which is the inverse of the FIM, is then not defined. To regularize the estimation problem, one can impose constraints on the parameters. In general, many sets of constraints are possible but ...

Direction finding by exploiting the directional radiation patterns of an Switched Parasitic Antenna (SPA) is considered. By employing passive elements (parasites), which can be shorted to ground using pin diodes, directional radiation patterns can be obtained. The direction finding performance of the SPA is examined by calculating a lower bound on the direction finding accuracy, the Cramér-Rao ...

In this paper, we analyze the performance of a non-data aided near maximum likelihood (NDA-NML) estimator for symbol timing recovery in wireless communications. The performance of the estimator is evaluated for an additive noise only channel. Performance analysis is extended to fading channels characterized by Rayleigh fading, Weibull fading and log-normal fading, appropriate to a variety of tr...

In this paper we present a powerful technique for the blind extraction of Direct-Sequence Code-Division Multiple Access (DS-CDMA) signals from convolutive mixtures received by an antenna array. The technique is based on a generalization of the Canonical or Parallel Factor Decomposition (CANDECOMP/PARAFAC) in multilinear algebra. We present a bound on the number of users under which blind separa...

A blind channel estimation and equalisation scheme is given for orthogonal frequencydivision multiplexing systems with unmodelled interference. The approach uses a generalised multichannel minimum variance principle to design an equalising filterbank that preserves the desired signal components and suppresses the overall interference. A channel estimate is then obtained by deriving an asymptoti...

In graph signal processing (GSP), prior information on the dependencies in is collected a which then used when or analyzing signal. Blind source separation (BSS) techniques have been developed and analyzed different domains, but for signals research BSS still its infancy. this paper, gap filled with two contributions. First, nonparametric method, relevant to GSP framework, refined, Cram\'{e}r-R...

We derive Cramér–Rao bound (CRB) expressions for the range (time delay), velocity (Doppler shift), and direction of a point target using an active radar or sonar array. First, general CRB expressions are derived for a narrowband signal and array model and a space-time separable noise model that allows both spatial and temporal correlation. We discuss the relationship between the CRB and ambigui...