A Novel FRFT Beamformer for Rayleigh Faded Channels

Authors:
Rajesh Khanna;Rajiv Saxena
Affiliations:
Department of Electronics and Communication Engineering, Thapar Institute of Engineering and Technology, Patiala, India;Department of Electronics and Communication, Jaypee Institute of Engineering and Technology (JIET), Guna, India
Venue:
Wireless Personal Communications: An International Journal
Year:
2010

Citing 5
Cited 1

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Abstract

A method of optimal beamforming for flat Rayleigh faded channels using the Fractional Fourier Transform (FRFT) is considered in this paper. It has been demonstrated through simulations that optimal beamforming with FRFT allows smaller mean-square errors in restoring signals degraded with linear time-or frequency variant distortions and Additive White Gaussian Noise. This is made possible by the additional flexibility that comes with free parameter `a' of the fractional Fourier transform as oppose to the classical Fourier transform (FT). The method is especially useful in moving source problems, where Doppler Effect produces frequency shift when the source is moving, as in mobile and wireless communication where user produces the frequency shift while moving. In this paper it is shown through simulations that beamforming in fractional domain reduces BER as compared to time or frequency domain.