Zero-forcing and Taylor series expansion fused double-layer precoding design in large-scale MIMO (Multiple Input Multiple Output) system

Abstract

The invention discloses a zero-forcing and Taylor series expansion fused double-layer precoding design in a large-scale MIMO (Multiple Input Multiple Output) system and belongs to the technical field of wireless communication. A specific design process is as follows that a user obtains a downlink channel state information estimation value through a received pilot sequence and feeds back the CSI (Channel State Information) estimation value to a base station through a feedback link; a base station only needs to design an outer layer precoding matrix in a Taylor series expansion mode through utilization of channel statistic information, thereby eliminating inter-group inter-user interference; a practical channel and the outer layer precoding matrix are regarded as equivalent channels; and the base station designs an inner layer precoding matrix based on the equivalent channels through utilization of a zero-forcing technology, thereby eliminating intra-group IUI (Inter-User Interference). According to the design, the interference is eliminated, the performance of the system is improved, the channel estimation complexity is reduced, correspondingly, the information feedback volume of the CSI is reduced, and spectrum resources are saved.

Description

technical field [0001] The invention belongs to the technical field of future mobile communication, in particular to a precoding technology in a massive MIMO system. Background technique [0002] With the rapid development of wireless communication technology, people's demand for communication efficiency is becoming more and more intense. Massive Multiple Input Multiple Output (MIMO) technology configures a large number of antennas at the transceiver end, without increasing the system bandwidth and transmission power. Under such circumstances, the system performance is greatly improved, and high-quality and high-speed information transmission on limited spectrum resources is realized. On the one hand, massive MIMO technology has brought people more satisfactory user experience and more reliable voice services. On the other hand, massive MIMO systems have serious inter-data stream interference and inter-user Interference, IUI), due to the limited ability of the receiver to p...

AI Technical Summary

Problems solved by technology

Although the outer precoding matrix designed based on BD precoding technology eliminates the IUI between groups to a certain extent, the improvement of system performance is limited.

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