Low-complexity geometry based MIMO channel emulation

The design and optimization of modern radio communication systems requires realistic models of the radio propagation channel. Especially for the test of mobile radio hardware devices, real-time implementations of such channel models are needed. Geometry based channel models are computationally intensive, since for every propagation path, every time instance and every delay or frequency bin a complex exponential has to be evaluated. On a real-time hardware channel emulator, like the ARC SmartSim, the number of paths P, that can be simulated, is limited by the available processing power. In this paper, a new method is introduced, that allows both to increase the number of paths P and to reduce the overall computational complexity.