Orthogonal codebook-based receiving and transmitting joint hybrid precoding method for millimeter wave MIMO system

Abstract

The invention discloses an orthogonal codebook-based receiving and transmitting joint hybrid precoding method for a millimeter wave MIMO system. The method comprises the steps that a, a model of a hybrid precoding problem of the millimeter wave MIMO system is built; b, the equivalent channel concept is introduced, an orthogonal codebook is designed, the hybrid precoding problem is transformed intoa maximum equivalent channel gain problem, and then analog precoding of a receiver and analog precoding of a transmitter are jointly designed; c, analog precodes of the receiver and the transmitter are set, and digital precoding of the receiver and digital precoding of the transmitter are jointly designed; and d, digital precodes and the analog precodes of the receiver and the transmitter are output. According to the method, by means of joint designing of the receiver and the transmitter, on one hand, the performance of obtaining the approximate digital precodes can be guaranteed, and on theother hand, channel information does not need to be fed back by the receiver to the transmitter, only the serial number of an analog precoding matrix in the codebook and the serial number of a digitalprecoding matrix in the codebook need to be fed back, the feedback time is shortened, and the implementability of the system is guaranteed.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method for joint hybrid precoding of transmitting and receiving in a millimeter-wave MIMO system based on an orthogonal codebook. Background technique [0002] With the continuous progress and development of mobile smart terminals, the explosive growth of mobile data volume has aggravated the congestion of traditional frequency bands. In this context, in order to meet the high-speed and large-scale data requirements of future wireless communications, the millimeter-wave frequency band with sufficient spectrum resources has gradually become the focus of attention. However, severe path loss has become an urgent problem to be solved in millimeter wave communication research. Fortunately, the wavelength of the millimeter wave is short, and the corresponding antenna units can be densely arranged in a small space to form a large-scale antenna array. Therefore, the beam gain for...

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Problems solved by technology

[0004] In view of the above-mentioned defects of the prior art, the purpose of the present invention is to provide a joint hybrid precoding method for transmitting and receiving based on an orthogonal codebook for a millimeter-wave MIMO system, aiming at solving the high complexity of implementing a hybrid precoding scheme under a fully connected structure. degree problem

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