Title :
Performance analysis of the beamformer for imperfect antenna array in QPSK
Author :
Suleesathira, Raungrong ; Niemkhum, Rungsak
Author_Institution :
Dept. of Electron. & Telecommun. Eng., King Mongkut´´s Univ. of Technol., Bangkok, Thailand
Abstract :
The performance of quadrature phase shift keying (QPSK) modulation with a beamformer is analyzed in the presence of array imperfections. A close-form expression is derived for the probability of a symbol error (PSE). Simulation results demonstrate that the presented beamformer based on the least squares method of subarrays (LSMS) outperforms the linearly constrained minimum variance (LCMV) method and is close to the optimal beamformer requiring known complex gain perturbation in terms of array patterns and symbol error rates (SERs).
Keywords :
antenna arrays; antenna radiation patterns; array signal processing; error statistics; least squares approximations; mobile radio; quadrature phase shift keying; QPSK; array pattern; array patterns; array signal models; close-form expression; complex gain perturbation; imperfect antenna array beamformer; least squares method of subarrays; linearly constrained minimum variance method; mobile communication systems; quadrature phase shift keying; symbol error probability; symbol error rates; Antenna arrays; Covariance matrix; Error analysis; Interference; Linear antenna arrays; Performance analysis; Phased arrays; Quadrature phase shift keying; Receiving antennas; Signal processing;
Conference_Titel :
Antenna Technology: Small Antennas and Novel Metamaterials, 2005. IWAT 2005. IEEE International Workshop on
Print_ISBN :
0-7803-8842-9
DOI :
10.1109/IWAT.2005.1461123
