Modified constant modulus algorithm for digital signal processing adaptive antennas with microwave analog beamforming

Denno, Satoshi; Ohira, Takashi

doi:10.1109/tap.2002.1017667

Cited by 42 publications

(20 citation statements)

References 21 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%

“…An alternative proof is as follows. Define the orthogonal projection matrix For any , and corresponding optimal , the MSE is given by (6) Thus, the MMSE solution satisfies…”

Section: Proofmentioning

confidence: 99%

“…Current hardware developments offer many possibilities. In [6]- [8], a phase shift preprocessor is implemented, which uses active and passive weighting elements to combine signals from the antenna array in the RF domain. Hajimiri et al [9] propose a design where the required phase delays are implemented in the RF to baseband demodulation step, by using a bank of several phase-shifted local oscillators.…”

mentioning

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.

358

271

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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%

“…An alternative proof is as follows. Define the orthogonal projection matrix For any , and corresponding optimal , the MSE is given by (6) Thus, the MMSE solution satisfies…”

Section: Proofmentioning

confidence: 99%

mentioning

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.

358

271

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“…In this structure, a digital to analog converter (DAC) branch and one radio frequency conversion unit are used, and only one signal is transferred to the transmitting radio frequency front end. Several techniques have been developed to implement adaptive beam forming (ABF) on the MBF structure system [1,2]. Digital beam forming (DBF) is another hot technology that allows using digital signal processing operations on the antenna array signals.…”

Section: Introductionmentioning

confidence: 99%

A Steerable Least Square Approach for Pattern Synthesis

Chen¹,

Yin²,

Jiao³

2017

PIER M

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Abstract-The least square method has been widely applied in many fields. However, when the approach is used for antenna array pattern synthesis, it is not excellent. In this paper, the least square method is used to synthesize antenna array pattern, and its performance is reviewed. Then contraposing to the shortcoming of the least square method, a new steerable least square (SLS) method is put forward. For an antenna array whose manifold matrix has been determined, the projection matrix equation can be derived from array manifold matrix easily. In order to get premium solution of array element excitation, a novel projection matrix equation with adjustable matrices is adopted. The results of simulations show that the pattern synthesized by the traditional least square method fits the targeted pattern badly and is worse in the key performance indicators of peak level of side-lobe and null beam level than the targeted pattern; however, the pattern synthesized by the new SLS method fits the targeted pattern well in zero point and local peak distribution and is better in the key performance indicators of peak level of side-lobe and null beam level than the targeted pattern.

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“…One well-known suboptimal technique to reduce the number of RF and digital chains is using analog processing networks for linearly weighting the antennas, i.e., analog beamforming (BF). In [1], a phase shift processor, which uses active and passive weighting elements to change the phase at each antenna in the RF domain, is implemented.…”

Section: Introductionmentioning

confidence: 99%

A new digital predistortion technique for analog beamforming systems

Park

Jeong

Kim

2016

IEICE Electron. Express

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A digital predistortion (DPD) technique to linearize multiple power amplifiers (PAs) in analog beamforming systems is proposed. The analog beamforming system considered in this paper has one digital chain and multiple PAs/antennas controlled by phase shifters. Due to the system configuration, a single DPD should linearize the multiple PAs. To design the DPD, this paper introduces a cost function, squares of the sum of errors for all the PAs. The DPD solution minimizing the cost function is found by a recursive least squares (RLS) algorithm. Experimental results with commercial PAs show that the proposed DPD can effectively linearize multiple PAs.

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Modified constant modulus algorithm for digital signal processing adaptive antennas with microwave analog beamforming

Cited by 42 publications

References 21 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

A Steerable Least Square Approach for Pattern Synthesis

A new digital predistortion technique for analog beamforming systems

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