Skywave massive mimo-ofdm triple beam-based channel modeling and channel information acquisition

Abstract

Disclosed by the present disclosure is a skywave massive MIMO-OFDM triple beam-based channel modeling as well as related methods and systems for channel information acquisition. Established by the present disclosure is a skywave massive MIMO-OFDM triple beam-based statistical channel model, where a spatial-frequency-time domain channel vector is expressed as a product of a triple beam matrix and a triple beam domain channel vector; the triple beam matrix is composed of sampled triple steering vectors corresponding to one set of sampling points of a direction cosine, a time delay, and a Doppler frequency that are selected by a base station; where each of the sampled triple steering vectors is called as a triple beam. Based on the triple beam-based statistical channel model, the base station groups each of the users and allocates pilot sequences by utilizing the statistical channel information; the base station obtains an estimated triple beam domain channel vector by using the received pilot signal, and obtains the spatial-frequency-time domain channel vector for the pilot band and the data band according to the triple beam-based statistical channel model. The present disclosure performs a more accurate channel modeling, which can reduce pilot overhead and computational complexity.