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Abstract

In this paper, we investigate the performance of Frost’s linearly constrained minimum variance (LCMV) adaptive beamformer via computer simulations for QPSK signals transmitted over Rayleigh and Rician fading channels. Simulation results show that the Frost beamformer can still improve the signal-to-interference-plus-noise ratio, even over fading channels. For real-time underwater communications, a prototype system is implemented, which uses TMS320C40 digital signal processor chip for realization of the Frost beamformer. Through experiments in an acoustic trough the validity of the real-time Frost beamformer prototype system is verified, and the feasibility of its use in underwater communications is assessed.

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