Joint Antenna Decoupling and Beamspace Transform for Digital Antenna Array

In 5G mobile communication systems, mutual coupling compensation is necessary for antenna arrays to obtain high-quality pattern with very low sidelobes and deep deterministic nullings. Meanwhile, beamspace transform is promising to reduce complexity in array processing. Traditionally, these two techniques are implemented separately. In this paper, a technique is presented for both mutual coupling compensation and beamspace transform in a digital antenna array. Mathematically, the scheme can be readily implemented in a digital antenna array with low complexity. Simulation results have confirmed the correctness and effectiveness of the method.