Low Complexity Hybrid Precoder and Combiner Design for mmWave MIMO Systems

Hybrid precoding has been advocated as a promising technology, which can provide a compromise between system performance and hardware complexity in millimeter-wave (mmWave) multiple-input multiple-output systems. In this paper, we adopt a hierarchical idea to simplify hybrid precoder and combiner design in single-user mmWave systems. We propose a low complexity algorithm, which jointly designs analog precoder and combiner by phase extraction method, to maximize spectral efficiency. Then, the digital precoder and combiner are designed based on the obtained analog precoder and combiner to enhance the spectral efficiency. In addition, the proposed algorithm can be modified for practical scenario, where only finite resolution phase shifters are implemented. Finally, simulation results and mathematical analysis show that the proposed algorithm can achieve near-optimal performance. Moreover, the computational complexity of our algorithm is lower than the reference algorithms.