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2013 (Vol. 5, Issue: 12)
Article Information:

Avoiding Self Nulling by Using Linear Constraint Minimum Variance Beamforming in Smart Antenna

Balaem Salem, S.K. Tiong, S.P. Koh and Soodabeh Darzi
Corresponding Author:  Balaem Salem 

Key words:  Beam forming, LCMV, MVDR, , , ,
Vol. 5 , (12): 3435-3443
Submitted Accepted Published
November 09, 2012 December 17, 2012 April 10, 2013
Abstract:

The beam forming technique is important in smart antenna systems to enhance the data rates, null steering and coverage. This study presents two methods of beamformeing algorithm; Minimum Variance Distortion less Response (MVDR) and Linear Constraint Minimum Variance (LCMV). MVDR and LCMV techniques form radiation beams based on the received weight vector of the desired signal. The LCMV technique is found to be efficient than the MVDR in self-null even if the interference signal is closer from the desired signal. Simulation has been carried out to validate these two techniques. The four elements of the linear array smart antenna are used in our simulation program with the operation frequency around 2.3 GHz, noise power 0.5dB and the spacing between elements is 0.5&lambda. The result of the simulation reveals that both the modes are capable of providing high output power; however they need the direction of all the incoming sources, which is practically difficult to obtain. Nevertheless the MVDR beam forming minimizes the multi-path fading problem, by adding the multi-path signal, which increases the strength of the desired signal and nullifies the interference.
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  Cite this Reference:
Balaem Salem, S.K. Tiong, S.P. Koh and Soodabeh Darzi , 2013. Avoiding Self Nulling by Using Linear Constraint Minimum Variance Beamforming in Smart Antenna.  Research Journal of Applied Sciences, Engineering and Technology, 5(12): 3435-3443.
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ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
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