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Analog-digital hybrid precoding method of massive MIMO system

An analog-to-digital hybrid and large-scale technology, applied in transmission systems, radio transmission systems, advanced technologies, etc., can solve problems that are difficult to apply, few researches on MIMO hybrid precoding, and difficulty in utilizing multi-user multiplexing gain in large-scale MIMO systems, etc. problem, to achieve the effect of reducing hardware cost, reducing hardware cost and signal processing complexity, and reducing signal processing complexity

Active Publication Date: 2017-08-15
10TH RES INST OF CETC
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Problems solved by technology

[0007] At present, there are few researches on massive MIMO hybrid precoding for partially connected structures
Moreover, these existing precoding methods are almost only researched on single-user systems, and are mostly realized by algorithms with high complexity such as iteration or search; The multi-user multiplexing gain of the massive MIMO system, and the high complexity of the precoding algorithm makes it difficult to apply in the actual system

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  • Analog-digital hybrid precoding method of massive MIMO system
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Embodiment Construction

[0028] The present invention will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0029] refer to figure 1 . According to the present invention, the large-scale MIMO analog-digital hybrid precoder 101 at the base station is designed for K single-antenna users, and the K-channel independent data streams corresponding to the K users are encoded by the massive MIMO analog-digital hybrid precoder 101, by N t transmit antennas to K users. First, design the base station's analog-digital hybrid precoder for multiple single-antenna users. K independent data streams pass through the analog-digital hybrid precoder through 1-N t The wireless channels of transmitting antennas are sent to the user; the order of the downlink channel matrix H obtained by the base station is K×N t , obtain the downlink channel matrix H from the base station to K single-antenna users through the uplink and downlink reciprocity in the t...

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Abstract

The invention discloses an analog-digital hybrid precoding method of a massive MIMO system. Compared with the existing full-digital precoding method, the great lower of the radio frequency link number and the processing complexity can be greatly reduced with small spectrum efficiency loss by use of the analog-digital hybrid precoding method disclosed by the invention, and the power efficiency of the massive MIMO system is obviously improved. The analog-digital hybrid precoding method is realized through the following technical scheme: firstly, a base station acquires a downlink channel matrix H to K single-antenna users from the base station through the reciprocity of the uplink and the downlink or the feedback of a user side, and inputs k independent data streams into a massive MIMO analog-digital hybrid pre-coder; and then the massive MIMO analog-digital hybrid pre-coder determines an analog radio frequency precoding matrix FRF according to the channel matrix X, computes a digital baseband precoding matrix FBB according to the H and the determined FRF, performs analog-digital hybrid precoding on the input K data streams according to the determined FRF and FBB, and outputs a Nt dimensional column vector signal x sent by Nt antennas.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a low-cost and low-complexity modular-digital hybrid precoding method in a massive MIMO system. Background technique [0002] In the modern information society, with the vigorous development of high-quality multimedia services such as images and videos, mobile communication systems need to provide higher transmission rates and reliability. Under the condition that wireless spectrum resources are becoming increasingly scarce and the concept of "green communication" is becoming more and more popular, researchers have been unremittingly exploring wireless transmission technologies with high spectral efficiency and power efficiency. Multiple-input multiple-output MIMO (also known as multi-antenna) technology makes full use of space resources by setting multiple antennas at both ends of the communication link. It can provide diversity gain to improve system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0456H04B7/0413
CPCH04B7/0413H04B7/0456Y02D30/70
Inventor 张雷周晓锋代红
Owner 10TH RES INST OF CETC
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