User scheduling method and equipment in MIMO wireless communication system

Abstract

The invention relates to a user scheduling method and equipment in an MIMO (Multiple Input Multiple Output) wireless communication system. All user equipment select the respective channel vectors from a codebook according to the minimum chordal distance rule, the SINR (Signal to Interference Plus Noise Ratio) value of a channel between each user equipment and a base station of which the user equipment belongs, then the indexes and the SINR values of the channel vectors of all the user equipment are sent to network equipment, the network equipment selects the user equipment according to channel-related information fed back by all the user equipment to enable the channel response matrix of each selected user equipment and the combined channel response matrix of other selected user equipment to meet the predetermined orthogonality condition, and the codebook reconstructs the corresponding pre-encodingmatrix in a centralized manner according to the respective codebook indexes of all the selected user equipment. The invention has the advantages that the channel response direction vectors of users are quantified by adopting the minimum chordal distance rule, and the users are scheduled by adopting the chordal distance, so that a good balance is stricken for reducing both the common-channel interference (CCI) and multi-user diversity gain.

Description

technical field [0001] The present invention relates to the field of MIMO wireless communication, in particular to a method and equipment for user scheduling in the MIMO wireless communication system. Background technique [0002] In the past few years, the multi-user multiple-input multiple-output (MIMO) technology has attracted widespread attention in the industry, which can improve system capacity by utilizing the diversity gain among multiple users in the transmission process. However, in a multi-user MIMO (MU-MIMO) system, co-channel interference (CCI) is a major factor hindering further improvement of system performance. In order to eliminate co-channel interference (CCI), suitable precoding techniques are gradually emerging. However, precoding techniques are usually associated with user scheduling schemes, and a good scheduling scheme can further improve system performance. Therefore, the user scheduling scheme is also a key point to be considered in the process of ...

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Problems solved by technology

[0005] The disadvantage of this scheme is that the base station can accurately design the zero-forcing precoder only after the user equipment is finally scheduled; moreover, the signal-to-interference-noise ratio fed back by each user equipment is an estimated value, which causes the selected user equipment The equipment is not necessarily optimal, so it will lead to a decrease in system performance

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