Estimation of QPSK signal via different smart array antennas deploying gradient approach

Smart Antenna systems have recently received increasing interest as the demand for better quality and new value added services on the existing wireless communication systems. These system of antennas include different array geometry and different adaptive techniques to enhance the received modulated signal with a fixed DOA by suppressing the inferences. Although enormous study has been done on smart antennas, special emphasis has not been provided to the antenna array structure. In this paper the performance of smart antenna in terms of the received signal for linear, circular and planararrays is observed. The adaptive array structure for all the geometry´s is trained using modified LMS algorithm and RLS algorithm. Comparison is made for different array structures using both the adaptive techniques.