A Downlink Cooperative Multipoint Transmission Method Based on Cooperative Decision Making and Adaptive Power Allocation

Abstract

The invention belongs to the technical field of communication, in particular to a downlink coordinated multi-point transmission method based on cooperative decision-making and adaptive power allocation. The main purpose of CoMP transmission is to improve the performance of cell edge users. In order to reduce the user's feedback on the channel state information and improve the power allocation efficiency of the base station, the present invention proposes the method. In this method, the CoMP transmission is initiated by the edge user: if the communication quality of the edge user is poor and cooperative transmission is required, it will feed back the channel state information to the adjacent base station, and each base station will make a cooperative decision based on this information; otherwise, the edge user No information is fed back, and neighboring base stations do not make collaborative decisions. After the adjacent base station decides to cooperate, it still performs adaptive power allocation and precoding design for different users according to the channel state information. Simulation results show that this method can greatly improve the performance of edge users on the basis of maintaining the overall system channel capacity unchanged.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a downlink coordinated multi-point transmission method based on cooperative decision-making and adaptive power allocation. Background technique [0002] In the LTE-A solution proposed by the 3GPP organization, the throughput of edge users is the performance index that it mainly considers. This is because due to the influence of propagation distance and inter-cell interference, whether it is a WCDMA system or an LTE system, there is a problem that the QoS of users at the edge of the cell is far lower than that of users at the center of the cell. The present invention relates to the key technology for improving the performance of cell edge users in the LTE-A system—coordinated multipoint transmission technology (CoMP). [0003] In the earlier 3GPP LTE scheme, the downlink uses Orthogonal Frequency Division Multiple Access (OFDMA) technology, and in order to reduc...

AI Technical Summary

Problems solved by technology

Although the CB scheme does not have this problem, its improvement on the performance of edge users is very limited. It only reduces the interference of adjacent cells to the edge users, but cannot obtain additional diversity gain.

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