Transmit Beamforming for MISO Frequency-Selective Channels with Per-Antenna Power Constraint and Limited-Rate Feedback
In this paper, the authors consider transmit BeamForming (BF) design under Per-antenna Power Constraint (PPC) for MISO frequency selective channels. Both Cyclic Prefixed (CP) Single Carriers (SC) and Orthogonal Frequency-Division Multiplexing (OFDM) systems are investigated. Since, there is no closed-form expression for the optimal PPC BF coefficients and the optimization tools employed to find the PPC solution are usually complicated, they here propose three computationally more effective suboptimal solutions to minimize the ARITHmetic mean of the Effective Error Probabilities (ARITH-EEP). Moreover, they address the issue of limited-rate feedback and a simple codebook design method for frequency selective channels is proposed.