This paper investigates a subarray based algorithm for direction of arrival (DOA) estimation of wideband uniform linear array (ULA), under the presence of frequency-dependent mutual coupling effects. Based on the Toeplitz structure of mutual coupling matrices, the whole array is divided into the middle subarray and the auxiliary subarray. Then two-sided correlation transformation is applied to ...

This paper presents a new technic to improve resolution and direction of arrival (DOA) estimation of two closed source, in array processing, when only few samples of received signal are available. In these conditions, the detection of sources (targets) is more arduous, and even breaks down. To overcome these problems, a new algorithm is proposed. It combines spatial smooth method to widen the s...

In this letter, a uniform linear array (ULA) is proposed for line-of-sight massive multiple-input-multiple-output (MIMO). It assumed that the number of antennas fixed. For given ULA with an arbitrary inter-element spacing, probability correlation among channel vectors two users being above threshold value derived. The spacing one which aforementioned minimized. To show effectiveness ULA, simula...

The problem of gridless direction arrival (DOA) estimation is addressed in the non-uniform array (NUA) case. Traditionally, DOA and root-MUSIC are only applicable for measurements from a uniform linear (ULA). This because sample covariance matrix ULA has Toeplitz structure, both algorithms based on Vandermonde decomposition matrix. breaks into its harmonic components, which DOAs estimated. Firs...

Estimating the directions-of-arrival (DOAs) of propagating plane waves is a problem of interest in a variety of applications including radar, mobile communications, sonar, and seismology. The widely studied uniform linear array (ULA) can only provide estimates of source bearings relative to the array axis. A planar. array is required if estimates of source azimuth and elevation are required (2D...

Direction of arrival (DOA) estimation using a uniform linear array (ULA) is a classical problem in array signal processing. In this paper, we focus on DOA estimation based on the maximum likelihood (ML) criterion, transform the estimation problem into a novel formulation, named as sum-of-squares (SOS), and then solve it using semidefinite programming (SDP). We first derive the SOS and SDP metho...

A new configuration for the adaptive beamforming technology has been presented in this research work. We modified structure of uniform linear array (ULA) such a way that correct beam can be formed uniformly all azimuth angles. For ULA composed M antennas, we place two extra elements on top and bottom (at axis). Then, develop mathematical model or same. To investigate efficacy proposed antenna c...

In array processing, mutual coupling between sensors has an adverse effect on the estimation of parameters (e.g., DOA). While there are methods to counteract this through appropriate modeling and calibration, they are usually computationally expensive, and sensitive to model mismatch. On the other hand, sparse arrays, such as nested arrays, coprime arrays, and minimum redundancy arrays (MRAs), ...

In this article we introduce a novel multiple-input-multiple-output (MIMO) spatial filter (SF) which can be applied as a preprocessing scheme to uniform linear arrays, preserving the Vandermonde structure of the steering vectors while changing the amplitude and the phase gradient of the steering vector in a nonlinear fashion. The new scheme is therefore titled Vandermonde Invariance Transformat...

Half-power beamwidth (HPBW) is a key parameter to measure the performance of antenna array and newly proposed intelligent reflecting surface (IRS) systems. In this letter, we first establish system model for IRS in uniform linear (ULA) rectangular (URA) configurations, then HPBW both cases are derived under far-field condition without considering channel path-loss fading. We find that ULA URA e...