Development of 61-Channel Digital Beamforming (Dbf) Transmitter Array for Mobile Satellite Communication

Li, Guang; Gong, Wenbin; Liu, Huijie; Yu, Jongmin

doi:10.2528/pier09082303

Cited by 24 publications

(10 citation statements)

References 26 publications

(22 reference statements)

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“…Array signal processing has been widely used in sensing and dataacquisition systems ranging from radar [1], mobile communications [2][3][4][5], cognitive radio [6] and medical imaging [7]. A versatile approach of array signal processing is beamforming [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], which is used to detect and enhance a desired signal while suppressing interference and noise at the output of an array of sensors.…”

Section: Introductionmentioning

confidence: 99%

“…A versatile approach of array signal processing is beamforming [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], which is used to detect and enhance a desired signal while suppressing interference and noise at the output of an array of sensors. It is well known that the benefits brought by beamforming such as signal-to-noise ratio enhancement and spatial resolution are restricted by the ratio of array aperture size relative to the working wavelength.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Robust Superdirective Beamforming for Hf Circular Receive Antenna Arrays

Zhou¹,

Gao²,

Zhang³

et al. 2013

PIER

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Abstract-Superdirective beamforming can highly reduce the aperture size of high-frequency receive array. At the same time, the closely spaced elements of a small aperture array can make it low efficiency and sensitivity to the array uncertainty, which limit its application in practice. Using a parameter called sensitivity factor, we found that array efficiency and robustness against array error could be considered simultaneously. On that basis, we derive a novel superdirective beamforming criterion based on a constrained sensitivity factor for the HF circular receive array. New method is analytical and computationally inexpensive. Through making the directive gain with a given sensitivity factor maximum, we calculate the optimal weights of the array elements. To illustrate the proposed method can increase the acceptance of HF superdirective receive arrays in practice, several numerical results are provided.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Robust Superdirective Beamforming for Hf Circular Receive Antenna Arrays

Zhou¹,

Gao²,

Zhang³

et al. 2013

PIER

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show abstract

“…Due to the advantage of high gain and wide coverage, space-borne array antenna has been employed in the global satellite communication system, such as Iridium and Globalstar system [1][2][3]. Space-borne array antenna is normally exposed to space environment that has extremely high/low temperatures and strong cosmic radiations, wherefore array elements will have the rising probability of failure as time goes by.…”

Section: Introductionmentioning

confidence: 99%

Space-Borne Hexagonal Array Element Failure Correction Using Iterative Convex Optimiztion

Song¹,

Li²,

Gong³

et al. 2014

PIER Letters

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Abstract-Element failure distorts the main-lobe pattern and increases side-lobe power level, which is almost impossible to be corrected artificially for space-borne array. It might be solved by redistributing the excitations of the left functional elements; however, this is a nonlinear, non-convex, and NP-hard problem. In this paper, two effective approaches are proposed for failure correction, which is performed for space-borne hexagonal array using digital beamforming (DBF). One method, a modified real-code genetic algorithm (RCGA), is employed that uses reinsertion and worst-elimination schemes, but it pays the high computation complexity. The other approach based on convex optimization chooses the excitations synthesized by RCGA as the initial points, and transforms the non-convex problem into a sequence of second-order cone programming (SOCP) problem, which can be solved iteratively by efficient optimization tool. Numerical results confirm that after the correction based on iterative convex optimization, the average root-mean-square error (RMSE) is reduced by 36%, and the relative side-lobe level (RSLL) is decreased by 6.7 dB, with respect to the RCGA-based correction pattern.

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“…The shape of the beam and the direction of the main lobe depend on amplitude and phase settings, and both are electronically controlled. Beam-formers are used to create a line-of-sight connection between a transmitter and a receiver [11,12].…”

Section: Introductionmentioning

confidence: 99%

A Distributed Variable Delay Line for Wideband Beam-Formers

Dabbagh¹,

Khalaf²,

Hawa³

2012

PIER Letters

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Abstract-A fully integrated CMOS wideband distributed variable delay line for time array beam-formers is presented. The delay line works over a full differential mode, and the delay cell function is based on differential amplifiers with active inductive peaking loads. A delay resolution of 15 ps is obtained with a maximum delay capability of 150 ps. The designed active delay line provides 3 scanning angles with 8.6 • of spatial resolution. This delay line is applicable for a 4 channel beam-former with an operational bandwidth of 500 MHz centered at 5 GHz. Our active delay line consumes up to 352 mW of power from a 2.5 V supply. The circuit is simulated in standard 0.25 µm BiCMOS process and occupies 252 µm × 123 µm of silicon area.

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Development of 61-Channel Digital Beamforming (Dbf) Transmitter Array for Mobile Satellite Communication

Cited by 24 publications

References 26 publications

Robust Superdirective Beamforming for Hf Circular Receive Antenna Arrays

Robust Superdirective Beamforming for Hf Circular Receive Antenna Arrays

Space-Borne Hexagonal Array Element Failure Correction Using Iterative Convex Optimiztion

A Distributed Variable Delay Line for Wideband Beam-Formers

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