Pilot pollution-eliminated double-layer pre-coding design method in massive MIMO system

A pilot pollution, large-scale technology, applied in the transmission system, baseband system, pilot signal distribution and other directions, can solve problems such as pilot pollution, achieve the effect of suppressing interference, suppressing interference between users, and solving the problem of pilot pollution

Active Publication Date: 2016-09-28
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The invention effectively suppresses the interference caused by pilot pollution, and solves the problem of pilot pollution in massive MIMO systems

Method used

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  • Pilot pollution-eliminated double-layer pre-coding design method in massive MIMO system
  • Pilot pollution-eliminated double-layer pre-coding design method in massive MIMO system
  • Pilot pollution-eliminated double-layer pre-coding design method in massive MIMO system

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Embodiment Construction

[0025] The following will combine figure 1 , figure 2 The specific embodiment of the present invention will be described in detail.

[0026] The massive MIMO uplink system of the present invention works in Time Division Duplex (TDD) mode. First, the user sends a pilot sequence to the base station to estimate the uplink channel, and the base station obtains the downlink channel according to the channel reciprocity. Link channel estimation; then, at the base station, the outer precoding matrix is ​​designed based on the Zero-Forcing (ZF) precoding idea to suppress inter-user interference in the cell. Finally, the channel and the outer precoding matrix are used as The equivalent channel is based on the minimum mean square error (Minimum Mean Square Error, MMSE) criterion to design the inner precoding matrix to suppress the interference caused by the pilot pollution in the system.

[0027] First, if figure 1 As shown, consider L cells with fully multiplexed pilots, each cell i...

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Abstract

The invention discloses a pilot pollution-eliminated double-layer pre-coding design method in a massive MIMO (Multiple Input Multiple Output) system, and belongs to the technical field of wireless communication. The specific design process is as follows: when the system works in a TDD (Time Division Duplex) mode, sending a pilot sequence to a base station by a user for estimation of an uplink channel, and obtaining downlink channel estimation based on channel reciprocity by the base station; then designing an outer-layer pre-coding matrix based on a zero-forcing pre-coding idea at the base station end so as to suppress inter-user interference in a cell; and finally regarding a channel and the outer-layer pre-coding matrix as an integer to serve as an equivalent channel, and further designing an inner-layer pre-coding matrix based on a minimum mean square error criterion to suppress interference caused by pilot pollution in the system. According to the pilot pollution-eliminated double-layer pre-coding design method in the massive MIMO system, the pre-coding matrix is designed in combination with the pilot pollution elimination, and the problem of inherent pilot pollution existing in the massive MIMO system is solved.

Description

technical field [0001] The invention mainly relates to the technical field of future mobile communication. Background technique [0002] In recent years, with the widespread popularization of smart terminals, the amount of mobile data has exploded, and people's demand for high-speed data transmission services has become increasingly strong. Therefore, academic circles and industrial circles have started to study the fifth generation mobile communication technology (5 th Generation, 5G) research, Massive-Multiple Input Multiple Output (Massive-Multiple Input Multiple Output, Massive-MIMO) technology, as the key transmission technology of 5G, has received very extensive attention in both academia and industry, and has become the current research focus. Massive MIMO technology doubles the system capacity and effectively reduces the system bit error rate by increasing the number of antennas at the transceiver end without increasing the system bandwidth; and precoding technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04L5/00H04L5/14H04L25/02
CPCH04B7/0456H04L5/0048H04L5/1469H04L25/0224
Inventor 景小荣李敏
Owner CHONGQING UNIV OF POSTS & TELECOMM
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