Short-range MIMO Throughput Prediction based on Spherical Wave Model

The exploration of Internet-of-things has led to widespread of short-range multiple-input multiple-output (MIMO) communications. However, traditional throughput models, limited by the far-field propagation assumptions, often fail to accurately evaluate the spatial multiplexing capability and throughput performance in short-range line-of-sight (LOS) scenarios. Against this backdrop, this letter reveals the limitations of the conventional plane wave model (PWM) based throughput model from the perspective of effective degree of freedom (EDOF) and develops a MIMO throughput model for short-range LOS scenarios using a spherical wave model (SWM). The relationship between EDOF and throughput is analyzed and discussed. Our results show that EDOF can effectively indicate throughput variations across different transceiver layouts in short-range LOS scenarios. Throughput measurements of MIMO devices are conducted to show the superiority of the proposed SWM-based throughput model to the traditional one.