A kind of multi-cell multi-user pilot allocation method in massive MIMO system

Abstract

The present invention provides a multi-cell and multi-user pilot allocation method under a massive MIMO system, which can eliminate pilot pollution of different types of cells while ensuring communication quality of edge users, and improve system performance. The method includes: assigning orthogonal category identifiers to base stations of different types of cells; dividing users of each cell into a central user group and an edge user group, and assigning different user groups to different groups of users in each cell according to the user grouping results. Pilot sequence; add the category identifier corresponding to the cell base station to the beginning of the pilot sequence sent by the cell user, and then send the pilot sequence to the base station; extract the category identifier from the pilot sequence received by the base station, and take the extracted category identifier The XOR operation is performed between the symbol and the class identifier assigned to the base station, and the pilot sequences sent by users in other types of cells are filtered out according to the XOR operation result. The invention relates to the technical field of wireless communication.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for allocating pilots of multiple cells and multiple users under a massive MIMO system. Background technique [0002] In recent years, massive MIMO is the key technology of the fifth generation wireless communication system (5th Generation, 5G). Compared with traditional MIMO technology, it has many advantages such as high transmission rate, energy efficiency and spectrum efficiency. However, the prerequisite for the massive MIMO system to take advantage of many advantages is the ability to obtain channel state information (CSI). At present, in massive MIMO systems, a pilot-based method is generally used for channel estimation. A pilot sequence is inserted into the information sequence at the transmitting end, and the receiving end performs channel estimation through the received pilot sequence. Ideally, a massive MIMO system allocates mutually orthogonal...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a multi-cell multi-user pilot allocation method in a massive MIMO system to solve the problem of severe pilot pollution in the prior art, which leads to system performance degradation

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