Downlink MU_COMP scheduling algorithm based on improved chordal distance

Abstract

The invention discloses a downlink MU_COMP (Multi-User_Coordinated Multiple Point) scheduling algorithm based on an improved chordal distance, which comprises the following steps that S1, edge cell users detect the strength of a current interference signal and feed back current signal interference noise ratios, and an activated user set in a coordinated transmission mode is determined according to the signal interference noise ratios; S2, a candidate user set and a selected user set are established, wherein the candidate user set comprises users in the activated user set; one of the users with the maximum F norm in the candidate user set is added to the selected user set, and the channel capacity of the users in the selected user set is computed; S3, a chordal distance between each user channel matrix in the candidate user set and a combined channel matrix in the selected user set is computed; S4, the user with the maximum chordal distance between the user channel matrix and the combined channel matrix in the selected user set is selected; S5, whether the users in the selected user set reach an upper user limit is judged, if so, S2 is skipped to, and if not, S6 is skipped to; and S6, block diagonalization precoding matrixes are designed for the edge cell users in the selected user set respectively, and a coordination base station uses the block diagonalization precoding matrixes to perform combined precoding and sending on the edge cell users.

Description

technical field [0001] The invention relates to the downlink MU_COMP scheduling algorithm based on the improved chord distance. Background technique [0002] With the increase in the number of mobile communication users and the rise of wireless broadband services (multimedia services), mobile communication systems are required to further increase data transmission rates and spectrum utilization. It will receive interference from adjacent cells, which severely limits the service quality and throughput of edge users, and the single-user scheduling in the coordinated transmission mode (COMP) can no longer meet the throughput requirements of the system compared with multi-user scheduling. However, there is interference between users in multi-user scheduling. In order to avoid interference, the traditional multi-user scheduling algorithm based on chordal distance uses F norm to measure user channel conditions, uses chordal distance to measure channel correlation, and uses F norm ...

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Problems solved by technology

[0002] With the increase in the number of mobile communication users and the rise of wireless broadband services (multimedia services), the mobile communication system is required to further increase the data transmission rate and spectrum utilization. It will receive interference from adjacent cells, which severely limits the service quality and throughput of edge users. Compared with multi-user scheduling, single-user scheduling in coordinated transmission mode (COMP) cannot meet the throughput requirements of the system. However, there is interference between users in multi-user scheduling. In order to avoid interference, the traditional chordal-distance-based multi-user scheduling algorithm uses F-norm to measure user channel conditions, uses chordal distance to measure channel correlation, and uses F-norm α power The product of chord distance is used as the criterion for user selection, and the complexity is relatively high

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