A Novel Encoded Excitation Scheme in a Phased Array for The Improving Data Acquisition Rate

Gutierrez-Fernandez, César; Jiménez, A.; Martín-Arguedas, Carlos J.; Ureña, J.; Hernández, Álvaro

doi:10.3390/s140100549

Cited by 10 publications

(6 citation statements)

References 15 publications

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“…(6) The application of the MEM in numerical experiments in accordance with formula (11) allowed the obtainment of an almost ideal image of scatterers from echo signals p m (t). The measurement time and the memory size for storing echo signals p m (t) are N e times lower than the time and size that are necessary for the detection by the double scanning method for the commutation matrix C nm = 1.…”

Section: Discussionmentioning

confidence: 99%

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Increasing the rate of recording ultrasonic echo signals in the double-scanning mode

Базулин

2015

Russ J Nondestruct Test

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To reduce the time of recording echo signals by an antenna array that operates in the dou ble scanning mode, it was proposed to use a set of pseudo orthogonal coding signals. As the coding signals, it is possible to use frequency modulated signals or phase manipulated signals according to the Kasami code by analogy to the FDMA or CDMA techniques for multichannel communication. The use of the maximum entropy method for decoding echo signals made it possible to reduce the noise level and increase the longitudinal resolution of reflector images in comparison to the case of using matched filtering. If an image is formed as the coherent sum of several partial images that are reconstructed using the C SAFT method for various positions of the antenna array, it is proposed to use several sets of Kasami codes in order to additionally reduce the noise level by more than 6 dB. Numerical experiments show the efficiency of the proposed approach.

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Section: Discussionmentioning

confidence: 99%

“…As a result, one will fail to obtain their high quality images. Recording echo signals in the double scanning mode will allow a decrease in this time by several times, but this may still be insufficient for high quality visualization of moving objects [6].…”

Section: Introductionmentioning

confidence: 99%

Increasing the rate of recording ultrasonic echo signals in the double-scanning mode

Базулин

2015

Russ J Nondestruct Test

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“…The synchronization algorithm proposed here for a Wavelet-OFDM receiver is based on the use of multi-level complementary sequences or Zadoff-Chu sequences as pilot signals, since they provide suitable correlation properties and a flexible length, which allow the proposal to be adapted to the number of available subcarriers for transmission. Both types of sequences have been already used in numerous sensory systems described in previous works due to these correlation properties [ 29 , 30 ].…”

Section: Proposed Synchronization Algorithmmentioning

confidence: 99%

Efficient Implementation of a Symbol Timing Estimator for Broadband PLC

Nombela

García

Mateos

et al. 2015

Sensors

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Broadband Power Line Communications (PLC) have taken advantage of the research advances in multi-carrier modulations to mitigate frequency selective fading, and their adoption opens up a myriad of applications in the field of sensory and automation systems, multimedia connectivity or smart spaces. Nonetheless, the use of these multi-carrier modulations, such as Wavelet-OFDM, requires a highly accurate symbol timing estimation for reliably recovering of transmitted data. Furthermore, the PLC channel presents some particularities that prevent the direct use of previous synchronization algorithms proposed in wireless communication systems. Therefore more research effort should be involved in the design and implementation of novel and robust synchronization algorithms for PLC, thus enabling real-time synchronization. This paper proposes a symbol timing estimator for broadband PLC based on cross-correlation with multilevel complementary sequences or Zadoff-Chu sequences and its efficient implementation in a FPGA; the obtained results show a 90% of success rate in symbol timing estimation for a certain PLC channel model and a reduced resource consumption for its implementation in a Xilinx Kyntex FPGA.

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“…One of its challenges is to deal with real-time applications. To improve the image qualities, many imaging techniques require more complex algorithms [5,6], possibly resulting in longer computational time and preventing them from being real-time. An ultrasound image is composed of many scanlines.…”

Section: Introductionmentioning

confidence: 99%

Toward Optimal Computation of Ultrasound Image Reconstruction Using CPU and GPU

Techavipoo

Worasawate

Boonleelakul

et al. 2016

Sensors

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An ultrasound image is reconstructed from echo signals received by array elements of a transducer. The time of flight of the echo depends on the distance between the focus to the array elements. The received echo signals have to be delayed to make their wave fronts and phase coherent before summing the signals. In digital beamforming, the delays are not always located at the sampled points. Generally, the values of the delayed signals are estimated by the values of the nearest samples. This method is fast and easy, however inaccurate. There are other methods available for increasing the accuracy of the delayed signals and, consequently, the quality of the beamformed signals; for example, the in-phase (I)/quadrature (Q) interpolation, which is more time consuming but provides more accurate values than the nearest samples. This paper compares the signals after dynamic receive beamforming, in which the echo signals are delayed using two methods, the nearest sample method and the I/Q interpolation method. The comparisons of the visual qualities of the reconstructed images and the qualities of the beamformed signals are reported. Moreover, the computational speeds of these methods are also optimized by reorganizing the data processing flow and by applying the graphics processing unit (GPU). The use of single and double precision floating-point formats of the intermediate data is also considered. The speeds with and without these optimizations are also compared.

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A Novel Encoded Excitation Scheme in a Phased Array for The Improving Data Acquisition Rate

Cited by 10 publications

References 15 publications

Increasing the rate of recording ultrasonic echo signals in the double-scanning mode

Increasing the rate of recording ultrasonic echo signals in the double-scanning mode

Efficient Implementation of a Symbol Timing Estimator for Broadband PLC

Toward Optimal Computation of Ultrasound Image Reconstruction Using CPU and GPU

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