Steerable Antenna Using Algorithm Based on Downhill Simplex Method

Abdullah, Noorsaliza; Kuwahara, Yoshihiko

doi:10.2528/pierc11042712

Cited by 4 publications

(6 citation statements)

References 8 publications

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“…We proposed using a defogger as the RSAA by placing several ports on it [4]. We used the simplex method to achieve robust beamforming with rapid convergence [5]. In addition, we confirmed that the proposed antenna was able to operate in multiband [6].…”

Section: Introductionmentioning

confidence: 86%

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Multiband shared aperture adaptive array using the rear defogger

Kuwahara

Abdullah

2012

2012 6th European Conference on Antennas and Propagation (EUCAP)

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Abstract-Conventional adaptive array consists of several antennas. However, for vehicular industrial design, it is preferable not to use additional antenna elements. Therefore, we propose a multiband shared aperture adaptive array antenna using a rear defogger. In addition, RSAA (reactive steered adaptive array) concept is applied for simplification and low power consumption. From simulation and experiments results, it shows that the proposed adaptive antenna can operate at 100 MHz (ISDB-T SB ) and 210 MHz (ISDB-T MM ) band and that it also has the phase diversity capabilities in the Rayleigh fading environment.

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Section: Introductionmentioning

confidence: 86%

“…If the correlation coefficient between the HGI and TGI of the received signal becomes large, the delayed signal has to be cancelled. We used the simplex method in which the correlation was the objective function [5].…”

Section: A Shared Aperture Based On a Rear Defoggermentioning

confidence: 99%

Multiband shared aperture adaptive array using the rear defogger

Kuwahara

Abdullah

2012

2012 6th European Conference on Antennas and Propagation (EUCAP)

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“…The linear antenna array consists of M number of elements with inter-element distance d, and an incident wave at an angle of ϕ. The Array Factor AF for this array is [18][19][20] …”

Section: The Misalignment Effectmentioning

confidence: 99%

“…Modified algorithms were developed to reduce the computational load by reducing the required vector length such as the Recursive LMS (R-LMS ). Nevertheless, this algorithm should wait until the required number of symbols is assembled to perform training [9,18]. Combing this algorithm with modulus detecting algorithms such as Constant Modulus Algorithm (CMA), Decision Direct Algorithm (DDA), or Conjugate Gradient Method (CGM ) will produce the blind adaptive beamforming algorithms such as LMS -CMA, LMS -DDA, RLMS -CMA, .…”

Section: Introductionmentioning

confidence: 99%

A Novel Ultra-Fast Ultra-Simple Adaptive Blind Beamforming Algorithm for Smart Antenna Arrays

Jabbar¹

2011

PIER B

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Abstract-This research proposes a new blind tracking algorithm for smart antenna arrays by switching the main beam iteratively using the cost calculated from the received and predicted symbol. This algorithm will be called Cost Steering Algorithm Using DemodulationRemodulation Technique COSTAUS/DRT. It is completely independent of the Least Mean Squares (LMS ) or any derived version from it, and it does not need to investigate the cyclostationary properties of the incoming signal. A complete derivation and analytical model with simulation using Simulink is given in this research. The algorithm was tested under three different target motions which are a triangular motion (linear), sinusoidal motion (circular) and saw tooth motion which is an adverse case when the linear motion changes its path suddenly. The transmitter uses 16-level PSK signal with no Forward Error Correction code (FEC ) in order to test the algorithm under the worst situation. The algorithm is tested under different noise power levels. The antenna array is a linear array with 16-elements.

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“…Various algorithm has been used in ESPAR such as steepest descent, direct search, genetic algorithm and stochastic beamforming [4,5] In this study, an electronically steerable antenna is designed using a slotted array antenna. The downhill simplex method algorithm has been chosen because it has the fastest convergence time [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Electronically steerable antenna for WLAN application

Salleh

Mohd

Abdullah

2014

2014 IEEE Student Conference on Research and Development

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Abstract-In wireless communication systems, interference becomes a major problem in limiting the quality of the transmitted and received signals. A common problem in wireless communications is to eliminate the interference signal that is mixed with the original signal. Thus, adaptive beamforming is proposed to eliminate the interference signal. This paper presents an adaptive antenna using a slotted patch antenna for WLANs operated at 2.4 GHz. A reactively steerable antenna concept has been applied. A downhill simplex algorithm is used to maximize the cost function. The radiation pattern of the antenna is controlled by the reactance value connected to each port. From numerical simulation, null is performed for the incoming interference.

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Steerable Antenna Using Algorithm Based on Downhill Simplex Method

Cited by 4 publications

References 8 publications

Multiband shared aperture adaptive array using the rear defogger

Multiband shared aperture adaptive array using the rear defogger

A Novel Ultra-Fast Ultra-Simple Adaptive Blind Beamforming Algorithm for Smart Antenna Arrays

Electronically steerable antenna for WLAN application

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