Zero forcing Tomplinson Harashima (ZF-TH) precoding method for supporting two-user multichannel data transmission in multiple input multiple output (MIMO) broadcasting system

Abstract

The invention discloses a zero forcing Tomplinson Harashima (ZF-TH) precoding method for supporting two-user multichannel data transmission in a multiple input multiple output (MIMO) broadcasting system. In the technical scheme of the invention, a transceiving combined method is adopted for the first time to design ZF-TH precodes so as to reduce the interference among users; and based on the characteristic that different antennas of each user in the MIMO system can receive different signals, and a receiving end processes the received signals with a maximum ratio combining method to realize the multichannel data transmission of each user, thereby achieving the full multiplexing gain. The technical scheme provided by the invention has the complexity equal to that of traditional schemes, butimproves the effectiveness of the system remarkably.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a precoding method for a multi-antenna system in wireless communication, in particular to a ZF-TH precoding method supporting two-user multi-channel data transmission in a MIMO broadcast system. Background technique [0002] The Multi-Input Multi-Output (MIMO) system can effectively improve the spectrum utilization rate. In the MIMO broadcasting scenario, the precoding of the MIMO system is divided into linear precoding and nonlinear precoding. The performance of linear precoding It is not as good as nonlinear precoding. Among all nonlinear precoding, dirty paper coding (Dirty Paper Coding, DPC) is the optimal precoding scheme, but its complexity is too high to be applied in practice. The nonlinear processing of ZF-TH (Zero Forcing Tomplinson Harashima, zero forcing TH (where Tomplinson Harashima is two personal names)) precoding only performs modular algebra op...

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Problems solved by technology

[0027] From the above precoding steps, it can be known that for the existing scheme, if the number of antennas at the receiving end is greater than the number of antennas at the sending end, then for HH H There will be 0 elements on the diagonal of R obtained by Cholesky decomposition, which is the same as There are contradictions, so the number of antennas at the receiving end of the ZF-based precoding matrix cannot be greater than the number of antennas at the sending end; if the receiving end is configured with multiple antennas in this scheme, there will be interference between user antennas, which is inconsistent with the ZF criterion

Therefore, in the existing scheme, the receiving end can only be configured with a single antenna to receive single-channel data. The spatial multiplexing gain of this scheme needs to be improved.

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