RIS-assisted cellular-removal large-scale MIMO symbiotic communication channel estimation method

The invention relates to the technical field of wireless communication, in particular to an RIS-assisted cellular-removal large-scale MIMO symbiotic communication channel estimation method, which comprises the following steps of: arranging M access points (AP), K RISs and K single-antenna users in a cellular-removal large-scale MIMO network; in the uplink pilot frequency transmission stage, all users send pilot frequency and data signals to all access points (AP) at the same time, and the data signals sent in each time slot are the same; according to the method, the RIS sends the pilot frequency at the same time, simple processing is carried out by using a binary phase shift keying method, the RIS successively sends the pilot frequency with two symbols of + 1 and-1 to the access points (AP), after each access point (AP) receives signals from a direct link and an indirect link, simple calculation processing is carried out on the signals received in the previous time slot and the next time slot, and the signals