An adaptive antenna array or a smart antenna can form a desired antenna pattern and adaptively control it if an appropriate set of antenna weights is provided and updated in software. We have studied an adaptive array antenna considering as an adaptive filter in the space and time domains for radio communications, so that the communication theory can be generalized into both the space and time domains. This paper focuses on space and time signal processing for CDMA and introduces a series of our research results in this area, such as appropriate structures and updating algorithms of an adaptive array antenna for CDMA, space and time interference canceller and optimum multiuser receiver for CDMA, and joint optimization between transmitting and receiving array antennas etc. Such space and time signal processing promises significant improvement of performance in a CDMA mobile communication system and other spread spectrum systems such as a spread spectrum vehicular communication and ranging system.
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