Robust adaptive beamforming for multi-antenna systems

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In the future-generation cellular mobile radio systems with base stations equipped by multi-antenna transceivers, the use of adaptive beamformers is a key technology for spatially selective signal reception (uplink beamforming) and transmission (downlink beamforming) which has recently emerged and is now an area of intensive research. Using the spatial selectivity of antenna arrays, the receive and transmit beamforming facilitates an increase in system capacity and a decrease in the transmission power. Thus, multi-antenna technology demonstrates the potential to support high data rates while at the same time using less power. However, these can be achieved by possibly increasing the computational complexity of the transmitter and receiver. As a result, multi-antenna technology poses optimization challenges that conventional design techniques cannot resolve directly. Our research within this project aims at resolving such challenges. In designing adaptive beamformers, the robustness issues have to be addressed. Indeed, the conventional adaptive beamforming techniques are developed for idealized signal and channel models. However, various imperfections, which occur in practice, can have deleterious effects on system performance. The main objective of this project is to capture the essential aspects of robust multi-antenna system design. Achieving this objective is expected to contribute, specifically, to defining beyond 3rd generation (B3G) wireless systems by taking into account the robustness issues.