I would like to ask your kindly advice in smart antenna system ... which parameters taken into account in design beamforming techniques? and how to measure the system performance?
Also, I would recommend you this introductory book:
BALANIS, C. A.; IOANNIDES, P. I. Introduction to Smart Antennas. San Rafael, CA: Morgan & Claypool Publishers, 2007.
In Chapter 6, you can find the Beamforming Fundamentals, which present the beamforming design under different criteria and the basics of adaptive beamforming.