The invention discloses a low-complexity hybrid precoding method in a millimeter wave large-scale MIMO system. In the method, the minimum F norm is got between corresponding positions of a precoding scheme corresponding to each radio frequency link and partially connected with a hybrid precoding scheme and an optimal digital precoding scheme under the condition of not considering the radio frequency link, and thus a digital precoding matrix and an analog precoding matrix of each radio frequency link are got via computation. The phase of the analog precoding matrix of each radio frequency linkis the phase of a maximum singular value vector of the optimal digital precoding matrix, the real part of a digital precoding matrix element is the product of conjugate transpose of the analog precoding matrix and the real part of an optimal digital precoding vector at a corresponding position, and the imaginary part of the digital precoding matrix element is the product of the conjugate transposeof the analog precoding matrix and the opposite number of the imaginary part of the optimal digital precoding vector at the corresponding position. Compared with analog precoding, the method providedby the invention can acquire the higher system accessibility and speed with the lower algorithm complexity.

Low-complexity hybrid precoding method in millimeter wave large-scale MIMO system

The invention discloses a hybrid precoding method of a large-scale MIMO system applied to a millimeter wave band. The method comprises the following steps: S1: obtaining, by a base station, channel state information (CSI); S2: performing SVD on a downlink channel to obtain a right singular matrix V, using a phase angle of a former NRF column of the V as each element in an analog precoding matrix FRF, wherein NRF represents the number of radio frequency links; S3: using former Ns columns of the right singular matrix V subjected to the SVD on the downlink channel as an optimal precoding matrix Fopt, and obtaining a digital precoder (the formula is described in the specification) according to the Fopt and the FRF by using a least-squares solution (LS), wherein Ns represents the number of datastreams; and S4: performing first time precoding on the data streams through the FBB obtained in the step S3, then performing phase adjustment on a signal, namely, the FRF in the step S2, by using aphase shifter, and finally transmitting the signal through an antenna. Compared with the prior art, the hybrid precoding method disclosed by the invention has the advantages that no optimization method or complicated iterative algorithm is needed, so that the complexity is greatly reduced, and higher spectral efficiency can be achieved.

Hybrid precoding method of large-scale MIMO system applied to millimeter wave band

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.

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

The invention belongs to the field of millimeter wave massive MIMO systems, in particular to a hybrid beamforming algorithm for massive MIMO. This new algorithm is designed to jointly optimize analogdomain beamforming and digital domain beamforming to maximize spectral efficiency. The invention is divided into two parts: an algorithm of analog beamforming; and the acquisition of a digital beamformer according to the "water injection method" when an analog beamformer is given. The algorithm is applicable to different types of analog networks, including continuously adjustable phase shifter networks, finite-bit adjustable phase shifter networks, switching networks, and the like. The simulation results show that the performance of the algorithm is close to the performance of the optimal all-digital beamforming, and the hybrid beamforming based on the switching networks is close to the performance of the phase shifter networks, which is more conducive to engineering implementation.

Hybrid beamforming algorithm for massive MIMO

The invention discloses a pilot frequency distribution method for a multi-cell multi-user large-scale MIMO system. According to a large-scale fading factor, users of all cells are classified into a center user group and an edge user group; secondary screening is carried out on users in the edge user group; because large-scale fading factors between the users in the center user group and base stations of cells are small and spatial distances between the center user groups of the adjacent cells are long, users in the center user group of all cells reuse a pilot frequency sequence set; and because large-scale fading factors between the users in the edge user group and base stations of the cells are large and spatial distances between the edge user groups of the adjacent cells are short, pilot frequency sequences orthogonal to each other are distributed to the edge user groups of different cells. The method disclosed by the invention has the following characteristics: the requirement on the pilot frequency sequence set scale as well as the pilot frequency resource costs is reduced; pilot pollution from adjacent cells can be inhibited; the channel estimation precision is improved; and thus the system performances are enhanced.

Pilot frequency distribution method for multi-cell multi-user large-scale MIMO system

The invention belongs to the technical field of wireless communication and discloses a standard-orthogonalization-based hybrid pre-coding method for a large-scale MIMO system Analog pre-coding design is based on equal-gain transmission The phase of a main diagonal element of a baseband equivalent channel matrix is set to zero to obtain the maximum antenna array gain so as to reduce the total energy consumption and complexity of a transmitter The design of a digital pre-coding matrix is based on standard orthogonalization and singular value decomposition By mapping a desired user to other user null space, the interference between users is completely eliminated and the maximum spectral efficiency is obtained A numerical result shows that the performance of the hybrid pre-coding method, when equipped with a small number of radiofrequency links, approaches that of an all-digital pre-coding solution that requires the same number of radiofrequency links as the antennas, and can obtain high spectral efficiency with low implementation complexity

Standard-orthogonalization-based hybrid pre-coding method for large-scale MIMO system

The present invention discloses a Massive MIMO system pilot frequency distribution method based on an edge user interference measurement value. A line and a weight are used for marking the interference relation between edge users of adjacent districts and the size of the interference, a pilot frequency distribution view is formed according to the line and the weight, and different pilot frequency resources are distributed to all the line users in the view for pilot frequency distribution of districts one by one. The Massive MIMO system pilot frequency distribution method based on an edge user interference measurement value marks the edge user interference relation of adjacent districts to allow the user having the interference to be distributed for using different pilot frequency sequences so as to allow limited pilot frequency resources to have more reasonable reuse in adjacent districts, and therefore the pilot frequency pollution is reduced, and the user receiving signal to interference plus noise power ratio and the transmission rate are improved in the condition of having the same resource wasting. Besides, the pilot frequency distribution method provided by the invention is executed by districts one by one, the information interaction of adjacent districts is just needed with no need for searching concentration processing modes for all the districts, and therefore the algorithm execution is more convenient.

Massive MIMO system pilot frequency distribution method based on edge user interference measurement value

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Standard-orthogonalization-based hybrid pre-coding method for large-scale MIMO system

Massive MIMO system pilot frequency distribution method based on edge user interference measurement value