Signal processing for wideband array applications

Tuan-Do-Hong,; Russer, P.

doi:10.1109/mmw.2004.1284944

Cited by 97 publications

(26 citation statements)

References 25 publications

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“…In analog beamforming, this result is achieved by adjusting the gains and phases of the signals feeding the array, whereas in digital beamforming, it is achieved through digital processing [13,22] .…”

Section: Implemented Beam Steering Systemmentioning

confidence: 99%

Beam steering application for W-band data links with moving targets in 5G wireless networks

Morales

Rodríguez

Gallardo

et al. 2017

J. Commun. Inf. Netw.

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Ubiquitous broadband Internet access is one of the major goals of the next generation of wireless communications. However, there are still some locations where this is difficult to achieve. This is the case on moving vehicles and, particularly, on trains. Among the possible solutions to this problem, RoF (Radio-over-Fiber) architectures have been proposed as low-latency, cost-effective candidates. Two elements are introduced to extend the RoF approach. First, the carrier frequency is raised into the W-band (75-110 GHz) to increase the available capacity. Second, a mechanical beam-steering solution based on a Stewart platform is adopted for the transmitter antenna to allow it to follow a moving receiver along a known path, thereby enhancing the coverage area. The performance of a system transmitting a 2.5 Gbit/s non-return-to-zero signal generated by photonic up-conversion over a wireless link is evaluated in terms of real-time BER (Bit Error Rate) measurements. The receiver is situated in different positions, and the orientation of the transmitter is changed accordingly. Values below the forward error correction limit for 7% overhead are obtained over a range of 60 cm around a center point situated 2 m away from the transmitter.

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Section: Implemented Beam Steering Systemmentioning

confidence: 99%

Beam steering application for W-band data links with moving targets in 5G wireless networks

Morales

Rodríguez

Gallardo

et al. 2017

J. Commun. Inf. Netw.

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“…sparsity in the model. In array processing a narrowband signal is usually defined as a signal that meets the condition about the bandwidth to center frequency being less than 1% [16], [17]. Here we extend the narrowband model from [10], [11] to a wideband model and derive a new wideband direction of arrival estimation method which is the novelty of this paper.…”

Section: This Paper Is a Revised And Expanded Version Of The Paper Prmentioning

confidence: 99%

Sparse covariance fitting method for direction of arrival estimation of uncorrelated wideband signals

Pejoski¹,

Kafedziski²

2014

Telfor

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“…Beamformers with frequency-invariant main-beam widths are desirable in many wideband signal processing applications, such as aeroacoustics [34]- [36], radar, sonar, and communications [37]. A widely used wideband array processing approach is to sample the spectrum of the wideband signal at each array element output to form narrowband frequency bins, and then process the samples in each frequency bin separately using narrowband array processing techniques [26].…”

Section: Constant Beamwidth Design For Wideband Arraysmentioning

confidence: 99%

Beampattern Synthesis via a Matrix Approach for Signal Power Estimation

Xie

Stoica

et al. 2007

IEEE Trans. Signal Process.

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Abstract-We present new beampattern synthesis approaches based on semidefinite relaxation (SDR) for signal power estimation. The conventional approaches use weight vectors at the array output for beampattern synthesis, which we refer to as the vector approaches (VA). Instead of this, we use weight matrices at the array output, which leads to matrix approaches (MA). We consider several versions of MA, including a (data) adaptive MA (AMA), as well as several data-independent MA designs. For all of these MA designs, globally optimal solutions can be determined efficiently due to the convex optimization formulations obtained by SDR. Numerical examples as well as theoretical evidence are presented to show that the optimal weight matrix obtained via SDR has few dominant eigenvalues, and often only one. When the number of dominant eigenvalues of the optimal weight matrix is equal to one, MA reduces to VA, and the main advantage offered by SDR in this case is to determine the globally optimal solution efficiently. Moreover, we show that the AMA allows for strict control of main-beam shape and peak sidelobe level while retaining the capability of adaptively nulling strong interferences and jammers. Numerical examples are also used to demonstrate that better beampattern designs can be achieved via the data-independent MA than via its VA counterpart.

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Signal processing for wideband array applications

Cited by 97 publications

References 25 publications

Beam steering application for W-band data links with moving targets in 5G wireless networks

Beam steering application for W-band data links with moving targets in 5G wireless networks

Sparse covariance fitting method for direction of arrival estimation of uncorrelated wideband signals

Beampattern Synthesis via a Matrix Approach for Signal Power Estimation

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