Log in

Relevant bibliographies by topics / Broadband beamforming / Journal articles

Journal articles on the topic 'Broadband beamforming'

To see the other types of publications on this topic, follow the link: Broadband beamforming.

Author: Grafiati

Published: 4 June 2021

Last updated: 31 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Broadband beamforming.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Li, Jiake, Zhe Ma, Lei Mao, Zhengjun Wang, Yi Wang, Huaiyu Cai, and Xiaodong Chen. "Broadband Generalized Sidelobe Canceler Beamforming Applied to Ultrasonic Imaging." Applied Sciences 10, no. 4 (February 11, 2020): 1207. http://dx.doi.org/10.3390/app10041207.

Full text

Abstract:

A broadband generalized sidelobe canceler (Broadband-GSC) application for near-field beamforming is proposed. This approach is implemented in the wavelet domain. Broadband-GSC provides a set of complex, adapted apodization weights for each wavelet subband. The proposed method constrains interference and noise signal to improve the lateral resolution with only one single emission. Performance of the proposed beamforming is tested on simulated data obtained with Field II. Experiments have proved that the new beamforming can significantly increase the image quality compared with delay-and-sum (DAS) and synthetic aperture (SA). Imaging of scattering points show that Broadband-GSC improves the lateral resolution by 43.2% and 58.0% compared with SA and DAS, respectively. Meanwhile，Broadband-GSC reduces the peak sidelobe level by 11.6 dB and 26.4 dB compared with SA and DAS, respectively. Plane wave emission experiment indicates that Broadband-GSC can improve the lateral resolution by 44.2% compared with DAS. Furthermore, the new beamforming introduces the possibility for higher frame-rate and higher investigation depth with increased lateral resolution.

APA, Harvard, Vancouver, ISO, and other styles

2

Tokaji, Kristóf, and Csaba Horváth. "Effect of a pylon on the broadband noise sources of counter-rotating turbomachinery." International Journal of Aeroacoustics 20, no. 8 (November 2021): 979–1002. http://dx.doi.org/10.1177/1475472x211055178.

Full text

Abstract:

Pylons are commonly used for the mounting of engines in the aircraft industry. On the other hand, the installation of a pylon influences the noise generation mechanisms and therefore alters the broadband noise characteristics of a given turbomachinery setup. In this investigation, a counter-rotating open rotor with and without a pylon is investigated in order to determine its effects on broadband noise sources. The various broadband noise sources and their typical frequency ranges have been determined using beamforming maps and spectral analysis. In order to attain a clear impression regarding the broadband noise sources, the Double Filtering beamforming method has been utilized in the investigation. This method removes the tonal components from the recorded signal of a microphone array, resulting in a purely broadband signal. Using beamforming maps, the dominant broadband noise source amplitudes and locations can therefore be investigated in great detail. Compared to other methods, the investigation of measurement data and beamforming maps helps determine the amplitude, the frequency range, and the significance of the various types of broadband noise sources that are truly present in the emitted noise. It has been found for lower frequencies, that the broadband noise sources at the blade root of the aft rotor are dominant, while for higher frequencies, the significant broadband noise sources are localized to the trailing edge region of the forward rotor and the leading edge of the aft rotor. The installation of a pylon has resulted in an additional broadband noise source appearing at the blade tip of the aft rotor.

APA, Harvard, Vancouver, ISO, and other styles

3

Bi, Yang, Xi’an Feng, and Yangmei Zhang. "Optimized Sonar Broadband Focused Beamforming Algorithm." Algorithms 12, no. 2 (February 5, 2019): 33. http://dx.doi.org/10.3390/a12020033.

Full text

Abstract:

Biases of initial direction estimation and focusing frequency selection affect the final focusing effect and may even cause algorithm failure in determining the focusing matrix in the coherent signal–subspace method. An optimized sonar broadband focused beamforming algorithm is proposed to address these defects. Initially, the robust Capon beamforming algorithm was used to correct the focusing matrix, and the broadband signals were then focused on the optimal focusing frequency by the corrected focusing matrix such that the wideband beamforming was transformed into a narrowband problem. Finally, the focused narrowband signals were beamformed by the second-order cone programming algorithm. Computer simulation results and water pool experiments verified that the proposed algorithm provides a good performance.

APA, Harvard, Vancouver, ISO, and other styles

4

Seydnejad, Saeid R., and Reza Ebrahimi. "Broadband beamforming using Laguerre filters." Signal Processing 92, no. 4 (April 2012): 1093–100. http://dx.doi.org/10.1016/j.sigpro.2011.10.022.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Guenther, Drake A., and William F. Walker. "Broadband optimal contrast resolution beamforming." Ultrasonics 52, no. 3 (March 2012): 387–401. http://dx.doi.org/10.1016/j.ultras.2011.09.005.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Agrawal, Monika, and Surendra Prasad. "Optimum broadband beamforming for coherent broadband signals and interferences." Signal Processing 77, no. 1 (August 1999): 21–36. http://dx.doi.org/10.1016/s0165-1684(99)00020-1.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Huang, Long Yang, Jun Luo, and Wei Jun Pan. "Spatial-Temporal Non-Uniform Subband Broadband Beamforming." Advanced Materials Research 108-111 (May 2010): 1223–28. http://dx.doi.org/10.4028/www.scientific.net/amr.108-111.1223.

Full text

Abstract:

A spatial-temporal scheme based on non-uniform subband general parameter filter banks for broadband beamforming of scaled aperture array is proposed in this paper. The scaled aperture array is composed of several uniformly-spaced linear subarrays, each of which processes an octave subband signal respectively. The non-uniform subband signal is implemented by tree-structure general parameter filter banks. Each subarray broadband beamforming is carried out by a kind of tapped-delay-line (TDL) infinite-impulse-response (IIR) filters beamformer, and four subarrays share the same weights. This processing architecture based beamformer splits the broadband signal into several narrower subband ones which are processed in parallel, and subarray is operating with lower sampling rate, which contributes to decreasing the computational load significantly and improving the speed and performances as well. Simulations show that computation complexity and load of this beamformer are much lower relative to the conventional TDL broadband beamfomer.

APA, Harvard, Vancouver, ISO, and other styles

8

Simanapalli, S., and M. Kaveh. "Broadband focusing for partially adaptive beamforming." IEEE Transactions on Aerospace and Electronic Systems 30, no. 1 (1994): 68–80. http://dx.doi.org/10.1109/7.250407.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Koca, M., and B. C. Levy. "Broadband beamforming with power complementary filters." IEEE Transactions on Signal Processing 50, no. 7 (July 2002): 1573–82. http://dx.doi.org/10.1109/tsp.2002.1011198.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Zhang, Ming, and M. H. Er. "Robust adaptive beamforming for broadband arrays." Circuits Systems and Signal Processing 16, no. 2 (March 1997): 207–16. http://dx.doi.org/10.1007/bf01183275.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Sydow, Carsten. "Broadband beamforming for a microphone array." Journal of the Acoustical Society of America 96, no. 2 (August 1994): 845–49. http://dx.doi.org/10.1121/1.410323.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

SINHA, PRIYABRATA, ALAN D. GEORGE, and KEONWOOK KIM. "PARALLEL ALGORITHMS FOR ROBUST BROADBAND MVDR BEAMFORMING." Journal of Computational Acoustics 10, no. 01 (March 2002): 69–96. http://dx.doi.org/10.1142/s0218396x02001565.

Full text

Abstract:

Rapid advancements in adaptive sonar beamforming algorithms have greatly increased the computation and communication demands on beamforming arrays, particularly for applications that require in-array autonomous operation. By coupling each transducer node in a distributed array with a microprocessor, and networking them together, embedded parallel processing for adaptive beamformers can significantly reduce execution time, power consumption and cost, and increase scalability and dependability. In this paper, the basic narrowband Minimum Variance Distortionless Response (MVDR) beamformer is enhanced by incorporating broadband processing, a technique to enhance the robustness of the algorithm, and speedup of the matrix inversion task using sequential regression. Using this Robust Broadband MVDR (RB-MVDR) algorithm as a sequential baseline, two novel parallel algorithms are developed and analyzed. Performance results are included, among them execution time, scaled speedup, parallel efficiency, result latency and memory utilization. The testbed used is a distributed system comprised of a cluster of personal computers connected by a conventional network.

APA, Harvard, Vancouver, ISO, and other styles

13

Son, Phan Le. "Irregular microphone array design for broadband beamforming." Signal Processing 193 (April 2022): 108431. http://dx.doi.org/10.1016/j.sigpro.2021.108431.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Ward, D. B., Zhi Ding, and R. A. Kennedy. "Broadband DOA estimation using frequency invariant beamforming." IEEE Transactions on Signal Processing 46, no. 5 (May 1998): 1463–69. http://dx.doi.org/10.1109/78.668812.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Zhao, Liuxian, and Miao Yu. "Flattened structural Luneburg lens for broadband beamforming." Journal of the Acoustical Society of America 148, no. 1 (July 2020): EL82—EL87. http://dx.doi.org/10.1121/10.0001638.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Jafari, A. H., Wei Liu, and D. R. Morgan. "Study of Sensor Positions for Broadband Beamforming." IEEE Signal Processing Letters 20, no. 8 (August 2013): 779–82. http://dx.doi.org/10.1109/lsp.2013.2266400.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Duan, Huiping, Boon Poh Ng, Chong Meng Samson See, and Jun Fang. "Broadband Beamforming Using TDL-Form IIR Filters." IEEE Transactions on Signal Processing 55, no. 3 (March 2007): 990–1002. http://dx.doi.org/10.1109/tsp.2006.887134.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Holfort, I. K., F. Gran, and J. A. Jensen. "Broadband minimum variance beamforming for ultrasound imaging." IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 56, no. 2 (February 2009): 314–25. http://dx.doi.org/10.1109/tuffc.2009.1040.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Tai, Junfei, Tian He, Qiang Pan, Dayi Zhang, and Xiaoran Wang. "A Fast Beamforming Method to Localize an Acoustic Emission Source under Unknown Wave Speed." Materials 12, no. 5 (March 4, 2019): 735. http://dx.doi.org/10.3390/ma12050735.

Full text

Abstract:

The beamforming method is capable of localizing the acoustic emission source in a large-scale structure but its accuracy relies strongly on the assumed propagation speed and it is quite time consuming to apply in online monitoring. This paper proposes a fast beamforming method to localize an acoustic emission source in a thin-walled structure with unknown wave speed. Firstly, the Bartlett beamforming method (BBM) is introduced into broadband Lamb wave signal processing to develop an L-shape array-based damage source localization method for a thin-walled structure. Secondly, the fast Bartlett beamforming method (FBBM) is proposed based on the characteristics of BBM. Finally, the pencil-lead break test is carried out to validate the proposed method. The test results show that the FBBM can accurately localize the damage source by any given probable wave speed much more rapidly than traditional delay-and-sum beamforming.

APA, Harvard, Vancouver, ISO, and other styles

20

Kidav, Jayaraj U., N. M. Sivamangai, M. P. Pillai, and S. G. Sreejeesh. "A broadband MVDR beamforming core for ultrasound imaging." Integration 81 (November 2021): 221–33. http://dx.doi.org/10.1016/j.vlsi.2021.07.006.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Kennedy, R. A., T. D. Abhayapala, and D. B. Ward. "Broadband nearfield beamforming using a radial beampattern transformation." IEEE Transactions on Signal Processing 46, no. 8 (1998): 2147–56. http://dx.doi.org/10.1109/78.705426.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Godara, Lal C. "Beamforming in the presence of broadband correlated arrivals." Journal of the Acoustical Society of America 92, no. 5 (November 1992): 2702–8. http://dx.doi.org/10.1121/1.404386.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

H. Abadi, Shima, Heechun Song, and David R. Dowling. "Broadband sparse-array blind deconvolution using unconventional beamforming." Journal of the Acoustical Society of America 132, no. 3 (September 2012): 2082. http://dx.doi.org/10.1121/1.4755687.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Hossain, Selim, and Lal Godara. "Efficient Robust Broadband Beamforming Algorithms Using Variable Loading." IEEE Latin America Transactions 10, no. 3 (April 2012): 1697–702. http://dx.doi.org/10.1109/tla.2012.6222573.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Marciano, J. S., and T. B. Vu. "Reduced complexity beam space broadband frequency invariant beamforming." Electronics Letters 36, no. 7 (2000): 682. http://dx.doi.org/10.1049/el:20000481.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Yoon, Seunghyun, Haesang Yang, and Woojae Seong. "Improvement of ray-based blind deconvolution through kurtosis-based phase correction." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A235. http://dx.doi.org/10.1121/10.0011175.

Full text

Abstract:

Ray-based blind deconvolution (RBD) has demonstrated remarkable performance on several in situ underwater acoustic data. RBD estimates the channel impulse response by compensating the source phase estimated by beamforming. However, when beamforming fails to achieve the desired signal-to-noise ratio, RBD fails to achieve the expected performance. To address this issue, we propose an improved RBD framework that uses the kurtosis of the channel impulse response to provide additional phase correction after beamforming. The proposed method is validated with the measurement data from the shallow-water acoustic variability experiment 2015 using a high-frequency (11–31 kHz) broadband source and a vertical line array of 16 sensors located approximately 3 km away. The results are compared with conventional RBD and discussed from an optimization point of view.

APA, Harvard, Vancouver, ISO, and other styles

27

Zhang, Zilong, Xiaodong Xu, and Yanan Wu. "Transmit Beamforming Optimization Design for Broadband Multigroup Multicast System." Mathematical Problems in Engineering 2015 (2015): 1–13. http://dx.doi.org/10.1155/2015/563863.

Full text

Abstract:

Spectral efficient transmission techniques are necessary and promising for future broadband wireless communications, where the quality of service (QoS) and/or max-min fair (MMF) of intended users are often considered simultaneously. In this paper, both the QoS problem and the MMF problem are investigated together for transmit beamforming in broadband multigroup multicast channels with frequency-selective fading characters. We first present a basic algorithm by directly using the results in frequency-flat multigroup multicast systems (Karipidis et al., 2008), namely, the approximation algorithms in this paper, for both problems, respectively. Due to high computational consumption nature of the approximation algorithms, two reduced-complexity algorithms for each of the two problems are proposed separately by introducing the time-frequency correlations. In addition, parameters in the new time-frequency formulations, such as the number of optimization matrix variables and the taps of the beamformer with finite impulse response (FIR) structure, can be used to make a reasonable tradeoff between computational burden and system performance. Insights into the relationship between the two problems and some analytical results of the computational complexity of the proposed algorithms are also studied carefully. Numerical simulations indicate the efficiency of the proposed algorithms.

APA, Harvard, Vancouver, ISO, and other styles

28

Qiu, Jichen, Zhiwei Li, Xiaofeng Jin, Xianbin Yu, Shilie Zheng, and Xianmin Zhang. "Long Distance Broadband Fiber Optical Beamforming Over 120 km." IEEE Access 9 (2021): 152182–87. http://dx.doi.org/10.1109/access.2021.3126395.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Godara, Lal C. "Application of the fast Fourier transform to broadband beamforming." Journal of the Acoustical Society of America 98, no. 1 (July 1995): 230–40. http://dx.doi.org/10.1121/1.413765.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Abadi, Shima H., H. C. Song, and David R. Dowling. "Broadband sparse-array blind deconvolution using frequency-difference beamforming." Journal of the Acoustical Society of America 132, no. 5 (November 2012): 3018–29. http://dx.doi.org/10.1121/1.4756920.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Ashraf, Nadeem, Ahmed A. Kishk, and Abdelrazik Sebak. "Broadband Millimeter-Wave Beamforming Components Augmented With AMC Packaging." IEEE Microwave and Wireless Components Letters 28, no. 10 (October 2018): 879–81. http://dx.doi.org/10.1109/lmwc.2018.2864883.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Kennedy, Rodney A., P. Thushara, D. Abhayapala, and Darren B. Ward. "Near‐field broadband array beamforming using wave equation transformation." Journal of the Acoustical Society of America 100, no. 4 (October 1996): 2696. http://dx.doi.org/10.1121/1.417063.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Chen, Yousheng, and Qin Gong. "Broadband beamforming compensation algorithm in CI front-end acquisition." BioMedical Engineering OnLine 12, no. 1 (2013): 18. http://dx.doi.org/10.1186/1475-925x-12-18.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Yan, Shefeng. "Robust Time-Domain Broadband Modal Beamforming for Circular Arrays." IEEE Transactions on Aerospace and Electronic Systems 56, no. 3 (June 2020): 1783–94. http://dx.doi.org/10.1109/taes.2019.2935598.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Wang, Xun, Benjamin Quost, Jean-Daniel Chazot, and Jérôme Antoni. "Iterative beamforming for identification of multiple broadband sound sources." Journal of Sound and Vibration 365 (March 2016): 260–75. http://dx.doi.org/10.1016/j.jsv.2015.11.036.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Koca, M., and B. C. Levy. "Broadband beamforming for joint interference cancellation and turbo equalization." IEEE Transactions on Wireless Communications 4, no. 5 (September 2005): 2244–55. http://dx.doi.org/10.1109/twc.2005.853815.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Wang, Yuzhu, Jingdong Chen, Jacob Benesty, Jilu Jin, and Gongping Huang. "Binaural Heterophasic Superdirective Beamforming." Sensors 21, no. 1 (December 25, 2020): 74. http://dx.doi.org/10.3390/s21010074.

Full text

Abstract:

The superdirective beamformer, while attractive for processing broadband acoustic signals, often suffers from the problem of white noise amplification. So, its application requires well-designed acoustic arrays with sensors of extremely low self-noise level, which is difficult if not impossible to attain. In this paper, a new binaural superdirective beamformer is proposed, which is divided into two sub-beamformers. Based on studies and facts in psychoacoustics, these two filters are designed in such a way that they are orthogonal to each other to make the white noise components in the binaural beamforming outputs incoherent while maximizing the output interaural coherence of the diffuse noise, which is important for the brain to localize the sound source of interest. As a result, the signal of interest in the binaural superdirective beamformer’s outputs is in phase but the white noise components in the outputs are random phase, so the human auditory system can better separate the acoustic signal of interest from white noise by listening to the outputs of the proposed approach. Experimental results show that the derived binaural superdirective beamformer is superior to its conventional monaural counterpart.

APA, Harvard, Vancouver, ISO, and other styles

38

M. Abd Elkader, Hala, Gamal M. Abdel-Hamid, Adly Tag El-Dien, and Asmaa A. Nassif. "Combined Beamforming with Orthogonal Space Time Block Code for MIMO-OFDM with Simple Feedback." Indonesian Journal of Electrical Engineering and Computer Science 4, no. 3 (December 1, 2016): 580. http://dx.doi.org/10.11591/ijeecs.v4.i3.pp580-585.

Full text

Abstract:

<p>In this paper, we introduce a proposed scheme to enhance the performance of orthogonal space time block code (OSTBC) with four time slots and two antennas by combing OSTBC with random beamforming to can use it in the downlink transmission for a mobile system. Multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) system has been recognized as one of the most promising techniques to achieve a good service and increase data rate in the next generation (4&5G) broadband wireless communications. So, we apply Space time block code (STBC) for MIMO-OFDM system with linear decoding. Also, we perform STBC with beamforming for MIMO-OFDM system to improve the performance of a system. Simulation results show that the beamforming improves bit error rate (BER) performance of OSTBC and STBC-OFDM for different types of modulation and diversity.</p>

APA, Harvard, Vancouver, ISO, and other styles

39

Herman, Krzysztof, Tadeusz Gudra, and Joanna Furmankiewicz. "Digital Signal Processing Approach in Air Coupled Ultrasound Time Domain Beamforming." Archives of Acoustics 39, no. 1 (March 1, 2015): 37–50. http://dx.doi.org/10.2478/aoa-2014-0005.

Full text

Abstract:

Abstract The work presents the results of experimental study on the possibilities of determining the source of an ultrasonic signal in two-dimensional space (distance, horizontal angle). During the research the team used a self-constructed linear array of MEMS microphones. Knowledge in the field of sonar systems was utilized to analyse and design a location system based on a microphone array. Using the above mentioned transducers and broadband ultrasound sources allows a quantitative comparison of estimation of the location of an ultrasonic wave source with the use of broadband modulated signals (modelled on bats' echolocation signals) to be performed. During the laboratory research the team used various signal processing algorithms, which made it possible to select an optimal processing strategy, where the sending signal is known.

APA, Harvard, Vancouver, ISO, and other styles

40

Godara, L. C., and M. R. S. Jahromi. "Limitations and capabilities of frequency domain broadband constrained beamforming schemes." IEEE Transactions on Signal Processing 47, no. 9 (1999): 2386–95. http://dx.doi.org/10.1109/78.782182.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Huang, Kuang‐Chih, Shun‐Hsyung Chang, and Yuan‐Hwang Chen. "An alternative structure for adaptive broadband beamforming with imperfect arrays." Journal of the Acoustical Society of America 87, no. 3 (March 1990): 1218–26. http://dx.doi.org/10.1121/1.398796.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Tao, Hailiang, and Jeffrey L. Krolik. "Waveguide invariant focusing for broadband beamforming in an oceanic waveguide." Journal of the Acoustical Society of America 123, no. 3 (March 2008): 1338–46. http://dx.doi.org/10.1121/1.2832335.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Yan, Shefeng, and Yuanliang Ma. "High-resolution broadband beamforming and detection methods with real data." Acoustical Science and Technology 25, no. 1 (2004): 73–76. http://dx.doi.org/10.1250/ast.25.73.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Yan, Shefeng, Chaohuan Hou, Xiaochuan Ma, and Yuanliang Ma. "Convex optimization based time-domain broadband beamforming with sidelobe control." Journal of the Acoustical Society of America 121, no. 1 (January 2007): 46–49. http://dx.doi.org/10.1121/1.2400622.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Dmitriyev, Edgar, Eugeniy Rogozhnikov, Natalia Duplishcheva, and Serafim Novichkov. "Calculating Beamforming Vectors for 5G System Applications." Symmetry 13, no. 12 (December 14, 2021): 2423. http://dx.doi.org/10.3390/sym13122423.

Full text

Abstract:

The growing demand for broadband Internet services is forcing scientists around the world to seek and develop new telecommunication technologies. With the transition from the fourth generation to the fifth generation wireless communication systems, one of these technologies is beamforming. The need for this technology was caused by the use of millimeter waves in data transmission. This frequency range is characterized by heavy path loss. The beamforming technology could compensate for this significant drawback. This paper discusses basic beamforming schemes and proposes a model implemented on the basis of QuaDRiGa. The model implements a MIMO channel using symmetrical antenna arrays. In addition, the methods for calculating the antenna weight coefficients based on the channel matrix are compared. The first well-known method is based on the addition of cluster responses to calculate the coefficients. The proposed one uses the singular value decomposition of the channel matrix into clusters to take into account the most correlated information between all clusters when calculating the antenna coefficients. According to the research results, the proposed method for calculating the antenna coefficients allows an increase in the SNR/SINR level by 8–10 dB on the receiving side in the case of analog beamforming with a known channel matrix.

APA, Harvard, Vancouver, ISO, and other styles

46

Bear, Lorie K., and Gary L. Pavlis. "Multi-channel estimation of time residuals from broadband seismic data using multi-wavelets." Bulletin of the Seismological Society of America 89, no. 3 (June 1, 1999): 681–92. http://dx.doi.org/10.1785/bssa0890030681.

Full text

Abstract:

Abstract We describe a new multi-channel procedure for estimating arrival time residuals from seismic array data. It incorporates aspects of three traditional array processing methods: frequency-domain beamforming, time-domain beamforming, and principal-component analysis. We start by applying the multi-wavelet transform to the data, which yields a suite of narrow-band seismograms. We use the multi-wavelet transform, instead of the windowed Fourier transform, for superior control over both the time and frequency resolution. We employ a beamforming procedure that uses principal component analysis on the transformed, time-aligned data. The values in the principal component vector and value pair are used to calculate a measure of coherence analogous to semblance. A measure of the misfit of the data to our plane-wave model is contained in the phase differences in the principal component vector. The phase differences can be converted directly to time residuals, but they are only resolvable to a fraction of the analyzing wavelength. Hence, our method is a staged process that moves from lower to higher analyzing frequency bands. We present two data examples that illustrate the wide range of spatial and temporal scales over which this approach can be applied. First, we determine time residuals for the deep-focus Bolivian earthquake of 1994 for a set of broadband stations spread over most of southern California. The time residuals had a range of 2 sec, and after their removal, we were able to stack the data to over 1.0 Hz. Second, we study a local event recorded by high-frequency sensors at an array in Turkmenistan with an aperture of less than 1 km. We found that the time residuals only had a range of 0.02 sec, but by removing them, we significantly improved the stack of the data for the arrival's dominant frequency.

APA, Harvard, Vancouver, ISO, and other styles

47

Chen, Yuling, Yang Lou, and Jesse Yen. "Dynamic Transmit–Receive Beamforming by Spatial Matched Filtering for Ultrasound Imaging with Plane Wave Transmission." Ultrasonic Imaging 39, no. 4 (March 1, 2017): 207–23. http://dx.doi.org/10.1177/0161734617692017.

Full text

Abstract:

During conventional ultrasound imaging, the need for multiple transmissions for one image and the time of flight for a desired imaging depth limit the frame rate of the system. Using a single plane wave pulse during each transmission followed by parallel receive processing allows for high frame rate imaging. However, image quality is degraded because of the lack of transmit focusing. Beamforming by spatial matched filtering (SMF) is a promising method which focuses ultrasonic energy using spatial filters constructed from the transmit–receive impulse response of the system. Studies by other researchers have shown that SMF beamforming can provide dynamic transmit–receive focusing throughout the field of view. In this paper, we apply SMF beamforming to plane wave transmissions (PWTs) to achieve both dynamic transmit–receive focusing at all imaging depths and high imaging frame rate (>5000 frames per second). We demonstrated the capability of the combined method (PWT + SMF) of achieving two-way focusing mathematically through analysis based on the narrowband Rayleigh–Sommerfeld diffraction theory. Moreover, the broadband performance of PWT + SMF was quantified in terms of lateral resolution and contrast from both computer simulations and experimental data. Results were compared between SMF beamforming and conventional delay-and-sum (DAS) beamforming in both simulations and experiments. At an imaging depth of 40 mm, simulation results showed a 29% lateral resolution improvement and a 160% contrast improvement with PWT + SMF. These improvements were 17% and 48% for experimental data with noise.

APA, Harvard, Vancouver, ISO, and other styles

48

LIU Ang, 刘昂, 邵光灏 SHAO Guanghao, 翟计全 ZHAI Jiquan, 叶星炜 YE Xingwei, and 张国强 ZHANG Guoqiang. "基于亚波长步进光延时线的雷达宽带波束形成技术." ACTA PHOTONICA SINICA 51, no. 3 (2022): 0306001. http://dx.doi.org/10.3788/gzxb20225103.0306001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Dong, Tao, Qiushi Wang, Yunxiao Zhao, Lixia Ji, and Hao Zeng. "Broadband Frost Adaptive Array Antenna with a Farrow Delay Filter." International Journal of Antennas and Propagation 2018 (September 3, 2018): 1–7. http://dx.doi.org/10.1155/2018/3574929.

Full text

Abstract:

In a broadband adaptive array antenna with a space-time filter, a delay filter is required before digital beamforming when the Frost algorithm is used to obtain the weight vector. In this paper, we propose a Farrow structure instead of a direct form FIR structure to implement the time delay filter since it can satisfy the demand for real-time update and is very suited for the FPGA platform. Furthermore, a new off-line algorithm to calculate the Farrow filter coefficient is presented if the filter coefficient is symmetric. Finally, simulations are presented to illustrate that the design methodology for the Farrow filter is correct. The simulations also prove that the Frost broadband adaptive antenna effectively mitigates the interferences with a Farrow filter.

APA, Harvard, Vancouver, ISO, and other styles

50

Zhang, Shurui, Qiong Gu, Hui Sun, Weixing Sheng, and Thia Kirubarajan. "Adaptive broadband frequency invariant beamforming using nulling-broadening and frequency constraints." Signal Processing 195 (June 2022): 108461. http://dx.doi.org/10.1016/j.sigpro.2022.108461.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!