Adaptive switching between multiple-input multiple-output (MIMO) transmission schemes like diversity and spatial multiplexing yields significantly higher capacity gains over fixed transmission schemes. Previous work has shown the impact of channel correlation and SNR on the switching between different schemes like beamforming and spatial multiplexing. This paper explores the influence of antenn...

A novel two-dimensional (2-D) direct-of-arrival (DOA) and mutual coupling coefficients estimation algorithm for uniform rectangular arrays (URAs) is proposed. A general mutual coupling model is first built based on banded symmetric Toeplitz matrices, and then it is proved that the steering vector of a URA in the presence of mutual coupling has a similar form to that of a uniform linear array (U...

Sidelobes cancellation is challenging task in beamforming and beam steering in smart antenna systems. The high level of sidelobes can significantly degrade the system performance as well as antenna power efficiency. In this paper, we present the new decimal genetic algorithm to reduce the sidelobe and at the same time create the nulls toward interferers and jammers. This technique takes advanta...

The problem of modified ML estimation of DOA's of multiple source signals incident on a uniform linear array (ULA) in the presence of unknown, spatially correlated Gaussian noise is addressed here. Unlike previous work, the proposed method does not impose any structural constraints or parameterization of the signal and noise covariances. It is shown that the characterization suggested here prov...

In the design phase of sensor arrays during array signal processing, the estimation performance and system cost are largely determined by array aperture size. In this article, we address the problem of joint direction-of-arrival (DOA) estimation with distributed sparse linear arrays (SLAs) and propose an off-grid synchronous approach based on distributed compressed sensing to obtain larger arra...

Channel estimation (CE) is an important process that done during the pilot transmission phase in each base station. This work addresses this for massive multiple-input multiple-output systems by studying scenario where channels are spatially correlated. Throughout work, spatial correlation between modeled using exponential model. The minimum mean square error (MMSE) estimator’s performance unco...

In the context of passive sources localization using antenna array, the estimation accuracy of elevation, and azimuth are related not only to the kind of estimator which is used, but also to the geometry of the considered antenna array. Although there are several available results on the linear array, and also for planar arrays, other geometries existing in the literature, such as 3D arrays, ha...

While the uniform linear array (ULA) is a well-known configuration being widely used in various practical application scenarios, it also encounters numerous challenges field of direction-of-arrival (DOA) estimation. Specifically, difficult for ULA to achieve satisfactory DOA estimation accuracy, especially case closely spaced sources. That because that resolvability severely restricted by its l...

Background. For radar systems, the beam pattern of a uniform linear array (ULA) is synthesized to ensure signal selectivity by direction. A specific ULA sidelobe cancelled rescaling weights. In particular, this done increasing number sensors and shortening scanning step. However, noticeable limitation loss transmitted power. Therefore, problem optimally balance versus effective cancellation.&#x...