Robust adaptive beamforming based on maximum likelihood estimation

Sun, Xiubao; Lian, Xiaohua; Zhou, Jianjiang

doi:10.1109/icmmt.2008.4540627

Cited by 9 publications

(10 citation statements)

References 12 publications

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“…The adaptive algorithm is designed to adapt efficiently in agreement with the environment and able to permanently preserve the desired frequency response in the look direction while minimizing the output power of the array. The combined form of the constraint is called constraint for narrowband beamforming [7], [14], [15].…”

Section: A Adaptive Beamforming Stagementioning

confidence: 99%

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Joint closed-loop power control and constrained LMS algorithm for DS-CDMA receiver in multipath fading channels

Dosaranian‐Moghadam

Bakhshi

Dadashzadeh

et al. 2010

2010 Global Mobile Congress

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In this paper, we propose smart step closed-loop power control (SSPC) algorithm in a direct sequence-code division multiple access (DS-CDMA) receiver in the presence of frequency-selective Rayleigh fading. This receiver consists of three stages. In the first stage, with constrained least mean squared (CLMS) algorithm, the desired users' signal in an arbitrary path is passed and the inter-path interference (IPI) is reduced in other paths in each RAKE finger. Also in this stage, the multiple access interference (MAI) from other users is reduced. Thus, the matched filter (MF) can be used for the MAI and IPI reduction in each RAKE finger in the second stage. Also in the third stage, the output signals from the matched filters are combined according to the conventional maximal ratio combining (MRC) principle and then are fed into the decision circuit of the desired user. The simulation results indicate that the convergence speed of the SSPC algorithm is faster than other algorithms. Also, we observe that significant saving in total transmit power (TTP) are possible with our proposed algorithm.Index Terms-Adaptive beamforming, constrained LMS, closed-loop power control, DS-CDMA, total transmit power.

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Section: A Adaptive Beamforming Stagementioning

confidence: 99%

“…The definition of the complex weights of this beamformer in the mth iteration for user q i, in the jth path is as follows [13], [15], [16].…”

Section: A Adaptive Beamforming Stagementioning

confidence: 99%

Joint closed-loop power control and constrained LMS algorithm for DS-CDMA receiver in multipath fading channels

Dosaranian‐Moghadam

Bakhshi

Dadashzadeh

et al. 2010

2010 Global Mobile Congress

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show abstract

Section: Constrained Lms Algorithmmentioning

confidence: 99%

“…The expected output power of the array in the n th iteration is given by A real-time CLMS algorithm for determining the optimal weight vector for user q i, in the j th path is [22], [23]: …”

Section: Constrained Lms Algorithmmentioning

confidence: 99%

“…However, it is drastically sensitive to the mismatch in the direction of arrival. Meanwhile, the weights estimated by the standard algorithm are sensitive to the signal power, requiring a lower step size in the presence of a strong signal for the algorithm to converge, which in turn regarding the decrease of mis-adjustment error, the convergence time is increased [22], [24].…”

Section: Constrained Lms Algorithmmentioning

confidence: 99%

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DS-CDMA Cellular Systems Performance with Base Station Assignment, Power Control Error and Beamforming over Multipath Fading

Moghadam

Bakhshi

Dadashzadeh

2011

IJCNC

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The interference reduction capability of antenna arrays, base station assignment and the power control algorithms have been considered separately as means to increase the capacity in wireless communication networks. In this paper, we propose base station assignment method based on minimizing the transmitter power (BSA-MTP) technique in a direct sequence-code division multiple access (DS-CDMA) receiver in the presence of frequency-selective Rayleigh fading and power control error (PCE). This receiver consists of constrained least mean squared (CLMS) algorithm, matched filter (MF), and maximal ratio combining (MRC) in three stages. Also, we present switched-beam (SB) technique in the first stage of the RAKE receiver for enhancing signal to interference plus noise ratio (SINR) in DS- KEYWORDSAdaptive beamforming, base station assignment, DS-CDMA, power control error, matched filter, maximal ratio combining

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A novel adaptive LMS-based algorithm considering relative velocity of source

Moghaddam

Rad

2010

2010 7th International Symposium on Communication Systems, Networks &Amp; Digital Signal Processing (CSNDSP 2010)

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Robust adaptive beamforming based on maximum likelihood estimation

Cited by 9 publications

References 12 publications

Joint closed-loop power control and constrained LMS algorithm for DS-CDMA receiver in multipath fading channels

Joint closed-loop power control and constrained LMS algorithm for DS-CDMA receiver in multipath fading channels

DS-CDMA Cellular Systems Performance with Base Station Assignment, Power Control Error and Beamforming over Multipath Fading

A novel adaptive LMS-based algorithm considering relative velocity of source

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