3D MIMO codebook generation method based on user distribution density matching

Abstract

The invention relates to the technical field of wireless communication, and particularly relates to a 3D MIMO codebook generation method based on user distribution density matching. The method comprises the following steps: acquiring user position information through a channel prediction module by a base station, establishing a mathematical model through two-dimensional Gaussion distribution, obtaining a horizontal probability density and a vertical probability density, and calculating a joint probability density; obtaining a cumulative distribution function according to the joint probabilitydensity, and working out a probability of being in each section of a user through the cumulative distribution function; dividing a cell into X sections, performing codebook allocation for the sectionsaccording to an uneven allocation algorithm, calculating coordinates according to an uneven allocation method, and obtaining a vertical code word and a horizontal code word. In the method provided bythe invention, while system performance gain is obtained, the code words with small intervals are used for the section where user density is high, and the code words with big intervals are used for the section where the user density is low, thus, feedback load can be reduced, and consequently, code word resource can be used more efficiently under the condition of limited feedback overhead.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for generating a 3DMIMO codebook based on user distribution density matching. Background technique [0002] Precoding technology is the main interference management technology to solve MUI and ISI for multi-user MIMO system. Time Division Duplexing (TDD) system uses channel reciprocity to obtain the channel state information of the transmitter (Channel State Information at Transmitter, CSIT) Frequency Division Duplexing (Frequency Division Duplexing, FDD) system requires dedicated Since the bandwidth of the feedback link is limited, it is of great significance to study codebook-based precoding. The massive MIMO system has a huge number of antennas at the base station and requires higher precoding performance. It is necessary to study codebooks with better performance in terms of system throughput and bit error rate. In the uniform linear array (Uniform L...

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Problems solved by technology

[0004] The existing 3D MIMO codebooks do not take into account the sparsity of user distribution in the cellular network when designing, so there will be too few codewords allocated in areas with dense users, codewords are missing, and too many codewords are allocated in areas where users are sparse. Phenomena that lead to codeword redundancy

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