Hybrid precoding method based on condition number of sub-band equivalent channel matrices

Abstract

The invention belongs to the technical field of wireless communications, and in particular to a hybrid precoding method based on condition number of sub-band equivalent channel matrices. The inventionadopts hybrid precoding in the precoding of the base station, determines a suitable precoding scheme according to the condition number magnitude of the sub-band equivalent channels, uses mixed zero-forcing precoding when the sub-band condition number is small, and uses mixing vector perturbation precoding when the sub-band condition number is large, thereby improving the overall bit error rate performance of the system with lower complexity.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and specifically relates to a hybrid precoding method based on subband equivalent channel matrix condition numbers. Background technique [0002] Millimeter wave technology and massive multiple-input multiple-output (Muti-Input Multi-Output, MIMO) technology are considered to be part of the key technologies for 5G, and thus have attracted widespread attention from academia and industry. Millimeter waves have a large number of available spectrum resources, and are expected to increase the data transmission rate of the next generation of mobile communications to above Gbps. Combining the propagation characteristics of millimeter waves and the characteristics of large-scale antenna arrays, hybrid precoding technology has become an important signal processing method in millimeter wave massive MIMO systems. It can effectively resist multipath fading and reduce interference between trans...

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Problems solved by technology

[0019] The purpose of the present invention is to aim at the above-mentioned zero-forcing precoding because the precoding matrix is ​​equal to the baseband downlink equivalent channel H e The inverse matrix or pseudo-inverse matrix of [k], so when the channel correlation between users becomes stronger, that is, the downlink channel H e When the row correlation of [k] becomes stronger, the precoding matrix F BB [k] will have a large singular value, resulting in β k becomes larger, the equivalent noise received by the user becomes larger, and the bit error rate of the user increases. The technical problem to be solved by the present invention is how to reduce β k

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