Computational Complexity Analysis of Beamspace Transformation for Dual Array Antennas

5G mobile communication using a high carrier frequency can operate a massive array antenna. A large-scale antenna element is a major factor that increases the hardware and software complexity of an array antenna. In such a massive array antenna, beamspace conversion is a very efficient method to reduce the high complexity of element space. This paper presents a mathematical model that analyzes the total number of addition/subtraction and multiplication/division of beamspace transformation formulas for a dual array antenna among various massive array antennas and provides results of computational complexity analysis.