Phase-only shaped beam synthesis via technique of approximated beam addition

Kautz, G.M.

doi:10.1109/8.774152

Cited by 29 publications

(9 citation statements)

References 23 publications

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“…equal gain combining). Most literature considers a single weight vector (with variable phases only) that should be designed to match certain performance criteria, e.g., [6], [15], and [16]. The paper [10] considers an APN with multiple outputs, and it is shown that any desired weight vector can always be obtained by linearly combining two phase-only beamformers, thus is sufficient.…”

Section: A Connectionsmentioning

confidence: 99%

“…After selecting and , we compute the residual vector and proceed similarly as (15), where After selecting and , we could continue the process with the residual vector However, and are not orthogonal, and better coefficients and can be computed at this point, leading to a smaller residual. This requires to solve (16) (17) where is a orthonormal matrix and a 2 2 upper triangular matrix. The solution to (16) is and the corresponding (smaller) residual is which is the projection onto the orthogonal complement of the column span of .…”

Section: B Quantized Matching Pursuitmentioning

confidence: 99%

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Analog Beamforming in MIMO Communications With Phase Shift Networks and Online Channel Estimation

Venkateswaran

Veen

2010

IEEE Trans. Signal Process.

369

272

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Abstract-In multiple-input multiple-output (MIMO) systems, the use of many radio frequency (RF) and analog-to-digital converter (ADC) chains at the receiver is costly. Analog beamformers operating in the RF domain can reduce the number of antenna signals to a feasible number of baseband channels. Subsequently, digital beamforming is used to capture the desired user signal. In this paper, we consider the design of the analog and digital beamforming coefficients, for the case of narrowband signals. We aim to cancel interfering signals in the analog domain, thus minimizing the required ADC resolution. For a given resolution, we will propose the optimal analog beamformer to minimize the mean squared error between the desired user and its receiver estimate. Practical analog beamformers employ only a quantized number of phase shifts. For this case, we propose a design technique to successively approximate the desired overall beamformer by a linear combination of implementable analog beamformers. Finally, an online channel estimation technique is introduced to estimate the required statistics of the wireless channel on which the optimal beamformers are based.Index Terms-ADC power consumption, analog beamforming, matching pursuit, passive RF phase shifters.

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Section: A Connectionsmentioning

confidence: 99%

Section: B Quantized Matching Pursuitmentioning

confidence: 99%

Analog Beamforming in MIMO Communications With Phase Shift Networks and Online Channel Estimation

Venkateswaran

Veen

2010

IEEE Trans. Signal Process.

369

272

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“…The trivial solution would be amplitude tapering, or, as an extreme case, the use of only a part of the transmit antenna; but this causes a significant loss of radiated power; furthermore, it may lower the overall efficiency since the high-power amplifiers in the T/R modules are no longer driven in saturation. Another solution is phase tapering, but the derivation of appropriate phase coefficients is a complex task that requires, in general, complicated numerical optimization techniques [42], [43].…”

Section: A Limitations Of a Fixed-aperture Illuminationmentioning

confidence: 99%

Multidimensional Waveform Encoding: A New Digital Beamforming Technique for Synthetic Aperture Radar Remote Sensing

Krieger

Gebert

Moreira

2008

IEEE Trans. Geosci. Remote Sensing

366

237

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Abstract-This paper introduces the innovative concept of multidimensional waveform encoding for spaceborne synthetic aperture radar (SAR). The combination of this technique with digital beamforming on receive enables a new generation of SAR systems with improved performance and flexible imaging capabilities. Examples are high-resolution wide-swath radar imaging with compact antennas, enhanced sensitivity for applications like alongtrack interferometry and moving object indication, and the implementation of hybrid SAR imaging modes that are well suited to satisfy hitherto incompatible user requirements. Implementationspecific issues are discussed and performance examples demonstrate the potential of the new technique for different remote sensing applications.Index Terms-Adaptive radar, along-track interferometry (ATI), ambiguity reduction, digital beamforming, displaced phase centre antenna (DPCA), ground moving target indication (GMTI), high-resolution wide-swath SAR imaging, hybrid SAR, MIMO SAR, synthetic aperture radar (SAR), waveform diversity.

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“…Tunable RF beamformer architectures with reduced number of RF chains have been previously proposed for low-power receivers fully implemented in Silicon [11,12,25]. However, the power levels of such designs are much lower than the power levels required in cellular base-stations, which can easily exceed 47 dBm.…”

Section: Existing Rf Beamforming Networkmentioning

confidence: 99%

Hybrid RF and Digital Beamformer for Cellular Networks: Algorithms, Microwave Architectures, and Measurements

Venkateswaran¹,

Pivit

Guan

2016

IEEE Trans. Microwave Theory Techn.

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Modern wireless communication networks, particularly cellular networks utilize multiple antennas to improve the capacity and signal coverage. In these systems, typically an active transceiver is connected to each antenna. However, this one-to-one mapping between transceivers and antennas will dramatically increase the cost and complexity of a large phased antenna array system.In this paper, firstly we propose a partially adaptive beamformer architecture where a reduced number of transceivers with a digital beamformer (DBF) is connected to an increased number of antennas through an RF beamforming network (RFBN). Then, based on the proposed architecture, we present a methodology to derive the minimum number of transceivers that are required for marco-cell and small-cell base stations, respectively. Subsequently, in order to achieve optimal beampatterns with given cellular standard requirements and RF operational constraints, we propose efficient algorithms to jointly design DBF and RFBN. Starting from the proposed algorithms, we specify generic microwave RFBNs for optimal marco-cell and small-cell networks. In order to verify the proposed approaches, we compare the performance of RFBN using simulations and anechoic chamber measurements. Experimental measurement results confirm the robustness and performance of the proposed hybrid DBF-RFBN concept eventually ensuring that theoretical multi-antenna capacity and coverage are achieved at a little incremental cost.

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Phase-only shaped beam synthesis via technique of approximated beam addition

Cited by 29 publications

References 23 publications

Analog Beamforming in MIMO Communications With Phase Shift Networks and Online Channel Estimation

Analog Beamforming in MIMO Communications With Phase Shift Networks and Online Channel Estimation

Multidimensional Waveform Encoding: A New Digital Beamforming Technique for Synthetic Aperture Radar Remote Sensing

Hybrid RF and Digital Beamformer for Cellular Networks: Algorithms, Microwave Architectures, and Measurements

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