Accuracy improvement of ray tracing method for between 0.8 and 37 GHz in street cell environment

摘要

Recently, mobile networks employing high-speed high-capacity communications have been investigated extensively to satisfy the demand for the faster and larger data communication. As one of the approaches, frequencies between 6 and 100 GHz bands are the candidates to utilize the relatively wide frequency bandwidths. Accordingly, the characteristics of radio propagation loss in these frequency bands must be characterized. We investigate the characteristics of radio propagation loss in street cell environment in the frequency bands using Ray Tracing (RT) by comparing with measurement results. It was observed that RT calculation tends to exhibit estimation error as frequency increases. In this report, we propose to use alternative model with detailed building shape in intersection accounting for surface roughness. RT calculation with the proposed model is numerically evaluated to reveal the characteristics of path loss prediction. Finally, the proposed method is implemented to be compared with measurement results. Parameters of the proposed model are optimized and sufficient accuracy can be achieved in the frequencies between 0.8 and 37 GHz.