In fact, at present, the orthogonal pilot technology has been widely used in 4G communication systems, and because of its strong anti-interference ability, it has great practical value. However, for the large-scale antenna system of 5G communication, the application of pilot technology faces a huge cost problem. Although in the 4G standard, the application cost of pilot technology has received considerable attention, due to the limited number of antennas, this issue is not a critical issue that needs to be resolved. However, with the advent of the 5G era, the application of large-scale antenna systems has greatly increased the number of antennas, and the application cost of pilot technology has also risen, which has become an important issue that cannot be ignored in the construction of 5G communication networks.
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