Iterative MMSE Transmit and Receive Filter Design for Frequency Selective MU-MISO Systems
Ralf Bendlin, Michael Joham, Josef A. Nossek, Yih-Fang Huang · 2007
We consider amulti-usermultiple-inputsingle-output(MU-MISO) scenario, where the decentralized users are served by a centralized transmitter with multiple channel inputs via frequency selective vector channels. For this broadcast setup, we jointly design the transmitter and receivers based on a minimum summeansquareerror(MSE) criterion. Contrary to previous work in this field, we do not restrict the receivers to be scalar weights but employfiniteimpulseresponse(FIR) receive filters. Since the sum MSE minimization has no closed-form solution neither for linear preceding nor forTomlinson-Harashimaprecoding(THP), we propose to use an alternating optimization and prove the convergence of the resulting iterative algorithm. The simulations show that the obtained linear and nonlinear preceding solutions with FIR receivers clearly outperform the state-of-the-art precoders with scalar receivers.