I have found an interesting paper published on the website of Huawei "Very-Low-Earth-Orbit Satellite Networks for 6G"
I have a question regarding the following part:
"3D UE- centric cell-free communication ..... On the other hand, spatial multiplexing for cell-free communications means that the beams from multiple nodes, e.g., satellites and terrestrial base stations, can be resolved using different phase gradients on the receiving array. It is thus possible to serve any location on the ground from multiple distinct sites and directions by fully exploiting the space-air-ground dimensions of the entire network."
- What are "phase gradients"?
I know in math gradient (differential operator applied to a three-dimensional vector-valued function to yield a vector whose three components are the partial derivatives of the function with respect to its three variables..). Did the authors mean that?
- Can someone explain how "phase gradients" can be used to resolve spatial multiplexing?
Thank you very much for your explanation!
