Hybrid Precoding and Combining Based on Rate Balancing for Wideband mmWave Multiuser MIMO Systems

Considering wideband millimeter wave (mmWave) multiuser multiple-input multiple-output (MIMO) systems, we propose a new hybrid precoding and combining method for rate balancing among users. The orthogonal frequency division multiple access (OFDMA) scheme is employed transmission, greedy-based algorithm developed subband allocation under the max-min user criterion. A derived that optimizes radio (RF) precoder combiners constant-modulus constraints as well baseband precoders power proposed iteratively updates RF using conjugate gradient method, through singular value decomposition numerical gradient-based users subcarriers. complexity of compared to existing processing schemes analysis runtime measurement. convergence verified via simulations in mmWave MIMO-OFDMA systems. It also shown outperforms techniques terms minimum rate, regardless signal-to-noise ratio, number antennas, Moreover, simulation results present more advantageous than conventional methods channel uncertainty.