Large-scale MIMO precoding method based on conjugate gradient method

A conjugate gradient method, a large-scale technology, applied in the field of massive MIMO precoding, which can solve problems such as high computational complexity

Inactive Publication Date: 2018-08-14
JIANGNAN UNIV
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Problems solved by technology

However, as the number of antennas increases, the RZF precoding algorithm has a high-dimensional matrix inversion process, which has high computational complexity.

Method used

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  • Large-scale MIMO precoding method based on conjugate gradient method
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  • Large-scale MIMO precoding method based on conjugate gradient method

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Embodiment Construction

[0043] Embodiments of the present invention will be described in detail below in conjunction with examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention.

[0044] A massive MIMO precoding method based on the conjugate gradient method, comprising the following steps:

[0045] step 1:

[0046] Assuming that the number of massive MIMO transmitter antennas is M, the number of receiver antennas is K, and the channel is a slow fading channel, the channel matrix is:

[0047]

[0048] where h k Represents the channel vector from the transmitting end to the kth receiving antenna, and the mean value is 0 M×1 Gaussian distribution with variance Φ, 0 M×1 Represents a 0 matrix with M rows and 1 column, and the matrix Φ is the coherence matrix of the channel with a bounded spectral norm.

[0049] Estimate the channel vector, and th...

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Abstract

The invention discloses a large-scale MIMO precoding method based on a conjugate gradient method. The method comprises the following steps of (1) estimating a channel matrix, and computing an RZF precoding expression through the estimated channel matrix; and (2) substituting the RZF precoding matrix into a transmission signal expression, and arranging to a form of a linear equation set AT=s; and solving the linear equation set by adopting the conjugate gradient method, and then obtaining the transmission signal expression. According to the method, an inverse matrix solving process is convertedinto multiplication of the matrix and the vector, so that the computation complexity is reduced, the improved conjugate gradient method optimizes an initial value of the conjugate gradient method according to the channel characteristics of a large-scale MIMO matrix, the convergence speed of the conjugate gradient method is accelerated, after two iterations, when the large-scale MIMO precoding based on the conjugate gradient method is 16 dB, a bit error rate reaches 10<-6>, and furthermore, after the improved conjugate gradient method carries out two iterations, the bit error rate of the method is close to the bit error rate of an RZF precoding algorithm.

Description

technical field [0001] The invention belongs to the field of mobile communication, and mainly relates to a massive MIMO precoding method based on a conjugate gradient method. Background technique [0002] Massive MIMO technology is one of the key technologies of the fifth generation mobile communication system. By increasing the base station and the transmitting antenna of the receiving end, the channel capacity, data transmission rate, spectrum efficiency and power efficiency of the system can be significantly improved. As the number of users increases, there will be interference between users in a large number of cells in the signals received by users, so precoding technology is introduced in the base station. In the downlink, the base station first obtains channel state information (CSI, channel state information) through channel estimation, and then precodes the modulated transmit signal based on the CSI, so as to eliminate inter-user interference. [0003] Traditional ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0456
CPCH04B7/0456
Inventor 李正权张弛刘洋吴琼沈连丰赵小青周成燕锋
Owner JIANGNAN UNIV
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