In this paper, an algorithm of direction finding is proposed in the presence of unknown mutual coupling. The preliminary direction of arrival (DOA) is estimated using the whole array for high resolution. Further refinement can then be conducted by estimating the angularly dependent coefficients (ADCs) with the subspace theory. The mutual coupling coefficients are finally determined by solving t...

A modified U-shaped patch antenna for triband applications with improved bandwidth and isolation characteristics is presented in this paper. The proposed antenna resonates at triband of 8 GHz, 9.73 GHz and 11.1 GHz frequencies for VSWR ≤ 1.4, with an improved impedance bandwidth of 42.3%. A 2×2 MIMO is developed by using the proposed antenna with a reduced mutual coupling of -40 dB. The simulat...

In this paper, we investigate the signal-to-noise ratio (SNR) in the palm-sized multi-antenna communication systems. The presented analysis includes the mutual coupling on both, signal and thermal noise. We apply the Nyquist’s thermal noise theorem to determine the thermal noise behavior in the multi-antenna system and to confirm the partial correlation of thermal noise for antenna spacing lowe...

The method of mutual coupling correction of array output signal is studied in the paper. According to array signal processing’s feature, array error model is analyzed and array mutual coupling is studied. The method that smart antennas’ channel calibration by BP network in wireless communication is proposed, which improves the accuracy of algorithms , such as the DOA estimation algorithm, Beam ...

Patch antennas have emerged rapidly with advancement of communication technology. For antenna design purposes, Finite difference time domain (FDTD) method is a commonly used. This paper focuses on the interaction among elements of MIMO antenna also known as mutual coupling using FDTD method. An M shape is introduced and with placement of isolating structure, round about 12dB of isolation is inc...

A smart antenna for mobile applications incorporating an array of ± 45 polarised stacked patch elements 4 columns wide excited by a multi-beamforming and beam shaping network is described. Four narrow overlapping beams, one wide “broadcast channel” beam and right and left shaped beams can be provided. The later shaped beams are to provide high capacity coverage in a specific narrow angular sect...

In their recent paper “Canalizing Boolean Functions Maximize Mutual Information,” Klotz et al. argued that canalizing Boolean functions maximize certain mutual informations by an argument involving Fourier analysis on the hypercube. This note supplies short new proofs of their results based on a coupling argument and also clarifies a point on the necessity of considering randomized functions.

Massive multiple-input multiple-output (MIMO) is a profitable technique to greatly boost spectral efficiency, which has been embraced by the fifth-generation (5G) and sixth-generation (6G) mobile communication systems. By exploiting appropriate downlink precoding algorithms, base stations (BSs) equipped with large number of antennas are able provide service multiple users as well several cells ...