A 3-D Wideband Cooperative Massive MIMO GBSM for High-Speed Railway Communication Systems

In future intelligent high-speed railway (HSR) communication systems, coordinated multipoint (CoMP) and massive multiple-input multiple-output (mMIMO) are two promising technologies. A three-dimensional (3-D) wideband cooperative mMIMO geometry-based stochastic model (GBSM) for HSR channels is proposed in this paper. The proposed GBSM employs a sphere model and two elliptic-cylinder models to describe common and uncommon clusters for different links and integrates the cluster evolution in both time and array domains. Besides, multi-link spatial cross-correlation function (CCF) is derived and investigated. And validation of the multi-link spatial cross-correlation function (CCF) is also analyzed according to the actual measurement data. The model is more practical to facilitate the design and performance evaluation of future intelligent HSR communication systems.