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A downlink precoding and base station power control method in a pilot time-shifted massive MIMO system

A large-scale, precoding technology, applied in transmission systems, radio transmission systems, advanced technologies, etc., can solve problems such as unsatisfactory performance and achieve the effect of suppressing interference

Active Publication Date: 2018-07-17
CERTUS NETWORK TECHNANJING
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Problems solved by technology

However, MRT and ZF precoding simply maximize the useful signal power or minimize the interference power, and their performance in pilot time-shifted massive MIMO systems is not ideal

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  • A downlink precoding and base station power control method in a pilot time-shifted massive MIMO system
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  • A downlink precoding and base station power control method in a pilot time-shifted massive MIMO system

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Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0033] The invention relates to SLNR-based precoding and base station power control under a time-shifted pilot structure in a massive MIMO system. First of all, the idea of ​​maximizing the signal-to-noise-to-noise ratio (SLNR) is applied to the time-shifted pilot structure, which not only considers the interference leaked by the user to other users, but also considers the interference leaked to the base station performing channel estimation by introducing a conversion factor. Secondly, with the goal of system asymmetry and maximum rate, the optimal conversion factor and downlink data transmission power are solved, so as to realize the performance compromise between downlink data transmission and uplink channel estimation.

[0034] The invention proposes a downlink precoding and base station ...

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Abstract

The invention provides a downlink precoding and base station power control method in a pilot frequency time shifting large-scale MIMO system. Through design of downlink precoding and base station power control, performance tradeoff of downlink data transmission and uplink channel estimation in a time shifting and pilot frequency structure is realized so as to raise frequency spectrum performance of the system. The idea of a maximum SLNR is applied to a time shifting pilot frequency structure, interferences leaked by a user to other users are suppressed, and interferences leaked to a base station which is carrying out channel estimation are suppressed because of introduction of conversion factors. On the basis of the above maximized SLNR precoding, through utilization of an idea of truncated polynomial PTE, a gradual downlink SINR expression only containing large scale information in a condition of a limited number of antennas is derived; and then relatively good base station downlink transmitting power and weighting factors are obtained through solving with maximization of graduality and the rate as targets, so that the performance tradeoff of the downlink data transmission and the uplink channel estimation are realized; and the frequency spectrum performance of the system can be improved while the complexity degree is lowered.

Description

technical field [0001] The invention relates to the field of interference coordination in a massive MIMO system in wireless communication, in particular to a downlink precoding and base station power control method in a pilot time-shifted massive MIMO system. Background technique [0002] In order to improve the utilization of limited spectrum resources and meet people's increasing wireless communication needs, massive MIMO (Large Scale MIMO or Massive MIMO) has become one of the key technologies for the new generation of wireless communication systems. It serves dozens of users using the same time-frequency resources at the same time through a base station equipped with hundreds of antennas. Studies have shown that as the number of base station antennas increases, noise and irrelevant inter-cell interference will be negligible; and simple signal processing methods such as Maximum Ratio Combining (Maximum Ratio Combining, MRC), Zero-Forcing (Zero-Forcing , ZF) can significa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456
CPCH04B7/0426Y02D30/70
Inventor 张国梅王杰吕刚明李国兵
Owner CERTUS NETWORK TECHNANJING
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