A Robust Least Mean Square Algorithm for Adaptive Array Signal Processing

Ali, Rana Liaqat; Khan, Shahid A.; Anis-ur-Rehman,; Malik, Shahzad A.

doi:10.1007/s11277-012-0533-6

Cited by 9 publications

(4 citation statements)

References 18 publications

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“…RLS algorithm has better convergence rate as compared to LMS algorithm, but its computational complexity for multiple input multiple output (MIMO) is large. A new approach called MIR-LMS algorithm for an adaptive array applicable for highspeed mobile communication has been reported in [17][18][19]. The re-weighted l 1 -norm penalized scheme for LMS Ʃ algorithm is presented in [20].…”

Section: Normalized Lms (Nlms) Algorithmmentioning

confidence: 99%

Adaptive beamformers using 2D-novel ULA for cellular communication

Dakulagi

Alagirisamy

2019

SN Appl. Sci.

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This paper presents the use of a novel two dimensional (2D) uniform linear array for adaptive beamforming algorithms. We used this novel antenna configuration to study the popular adaptive beamforming algorithms, namely, least mean square algorithm (LMS) and least normalized mean square algorithm (NLMS) and also proposed a variable step-size NLMS (VSSNLMS) algorithm. These beamformers are named as 2D-LMS, 2D-NLMS and 2D-VSSNLMS algorithms respectively. These algorithms not only improve the convergence rate but also mitigates the effect of interference by producing deep nulls in the interference directions. These algorithms are suitable for low-power, low-cost, anti-interference MIMO-WLAN, WiMAX, 4G LTE and other advanced communication systems. systems in [7], mobile communication systems in [8] and satellite-to-satellite systems in [9].

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Section: Normalized Lms (Nlms) Algorithmmentioning

confidence: 99%

Adaptive beamformers using 2D-novel ULA for cellular communication

Dakulagi

Alagirisamy

2019

SN Appl. Sci.

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“…Smart antenna array processing [6,41,42,[71][72][73][74][75] is based on the configuration of the spatial correlation matrix at the antenna array. In the design of smart antenna [43,44,76] techniques, system architecture, implementation and complexity limitations need to be considered.…”

Section: Types Of Smart Antennas With Their Principles and Configuratmentioning

confidence: 99%

“…There are various signal processing algorithms such as Least Mean Square (LMS), Recursive Least Square (RLS), Normalized Least Mean Square (NLMS), Fractional least Mean Square (FLMS) and Constant Modulus Algorithm (CMA), etc. The selection of step size is critical in LMS technique because this algorithm is prone to instability, if step size is not selected appropriately [76]. Some of improvement in these LMS algorithms is variable step size LMS algorithms [18,24], variable length LMS algorithm [24], and transform domain algorithms [76].…”

Section: Continuously Adapting the Pattern Towards The Optimal Characmentioning

confidence: 99%

Features and Futures of Smart Antennas for Wireless Communications: A Technical Review

Oluwole¹,

Srivastava²

2018

JESTR

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Smart antenna is one of the most proficient and dominant technological innovations for maximizing capacity, improve quality, and coverage in wireless communications system. This work presents relevant comprehensive technical review of research work, unanswered questions, and untried methods on smart antennas technology for wireless communication systems. This also examines most of the significant improvements in the field of smart antennas technologies and the related fields in wireless communication systems. An evaluation of the analytical techniques for the theoretical analysis of adaptive beamforming algorithm, level of the system performance optimization approaches has been highlighted. Performance realistic evaluation and implementation cogent parameters areas for the deployment of smart antennas on the performance system in wireless communication systems have been also examined.

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“…Adaptive array technology is an effective anti-jamming measure and has extensive use as its power inversion (PI) array does not require a priori information of the useful signal, interference signal characteristics and incident direction, and it is easy to achieve [7] . The structure of the power inversion array can be shown in Fig.2, where the first array element weight value is set to "1", next make the output power of the array have minimum by adaptive algorithm adjusting the weight value of other elements of the array [8] .…”

Section: Mc-lms Interference Suppression Algorithmmentioning

confidence: 99%

A Method of Suppressing Coherent Interference Based on Improved Nulling Technology

Xiang¹,

Dong²

2013

2013 Fourth World Congress on Software Engineering

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In the environment with coherent interferences, the common beamforming method has poor ability to suppress coherent interferences by estimating accurately the direction of arrival (DOA) of coherent signal and desired signal. The new anti-jamming technology based on multiple constrained least mean-square (MC-LMS) algorithm is proposed by the analysis of the coherent signal and the weighted vector two quadratic performance functions in the paper. The method uses MC-LMS algorithms calculates the weights for weighting the output of array signals, so the coherent interferences are suppressed by analyzing its spectrum. The algorithm has low computational complexity, high robustness and convergence. The results of simulation show that the coherent interference could be suppressed; the effectiveness of the proposed method are demonstrated with the complex electromagnetic environment. Keywords-uniform circular array; coherent interference; Multiple Constrained Least Mean Square algorithm; beam pattern . INTRODUCTIONWith the wide application of satellite navigation systems, GPS interference and anti-interference has become a hotspot in the field of satellite navigation. Because multipath effects and the enemy intends impose interference, there will be a coherent interference signal in the complex electromagnetic environment, which highly decreases the performance of receiving system. Therefore, How to effectively inhibit coherent interference in real time has become one of key technology to safeguard navigation receiver system to work.When the conventional beamforming algorithm processes coherent signal, there will be a signal destructive phenomenon, which make it difficult to accurately locate the interference direction. In order to suppress jamming, the literature [1] analyzes adaptive spatial smoothing algorithm and verified its anti-interference performance. However, this method can only be applied to the uniform linear array antenna, not applied to the flow-type antenna of the other arrays, such as a circular array rectangular plane array and other anti-jamming antenna in which coherent interference can't be suppresses and limits its application. The literature [2] proposed an optimal beamforming method which is applicable to any array structure, but need to estimate the direction of interference signal and preprocess the received data and it's hard to be achieved. The literature [3] puts forward a coherent beamforming technology based on uniform circular array, which virtually parallel moves the antenna array at the first, then inhibits coherent interference using the principle of shift beam smoothing forming and has good but large number of operations and complex calculations performance, will be faced if we want to know the direction of arrival (DOA) of signal. The method of combination of MC-LMS algorithm to form airspace adaptive nulling anti-jamming based on 4-element Y-type uniform circular array UCA is adapted, and thoroughly derives and proves the effect degree of the coherent interference on satellite receiv...

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A Robust Least Mean Square Algorithm for Adaptive Array Signal Processing

Cited by 9 publications

References 18 publications

Adaptive beamformers using 2D-novel ULA for cellular communication

Adaptive beamformers using 2D-novel ULA for cellular communication

Features and Futures of Smart Antennas for Wireless Communications: A Technical Review

A Method of Suppressing Coherent Interference Based on Improved Nulling Technology

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