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Partial pilot frequency multiplexing method for overcoming pilot pollution in large-scale MIMO system

A technology of pilot frequency pollution and pilot frequency reuse, applied in the field of communication, can solve problems such as pilot frequency pollution

Active Publication Date: 2015-11-11
XI AN JIAOTONG UNIV
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Problems solved by technology

If the base station is doing channel detection, users in adjacent cells use different pilot frequencies, then the base station will detect the joint channel of these users, so that these users will send signals together during downlink transmission, resulting in Frequent pollution

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  • Partial pilot frequency multiplexing method for overcoming pilot pollution in large-scale MIMO system
  • Partial pilot frequency multiplexing method for overcoming pilot pollution in large-scale MIMO system
  • Partial pilot frequency multiplexing method for overcoming pilot pollution in large-scale MIMO system

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Embodiment Construction

[0039] The present invention is described in further detail below in conjunction with accompanying drawing:

[0040] In massive MIMO communication systems, since the total number of pilots is limited, different orthogonal pilots cannot be allocated to all users, so the problem of pilot pollution always exists. In order to reduce pilot frequency pollution, the present invention allocates different pilot frequencies to users with strong mutual interference, and users with weak mutual interference reuse the same pilot frequency. When dividing users, it is necessary to set a SIR threshold, and divide them into central users and edge users according to their own SIRs. The central users in different cells reuse the same pilot, and the edge users in adjacent cells use different pilots. pilot, such as figure 1 shown.

[0041] Through this pilot allocation method, we can see that the central users of different cells are far apart, and using the same pilot will not cause strong interf...

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Abstract

The invention discloses a partial pilot frequency multiplexing method for overcoming pilot pollution in a large-scale MIMO system. The method includes following steps: (1) in the training stage, users determine the size of the interference according to received signals and transmit the information to a base station; (2) the base station determines a signal to interference and signal ratio threshold according to different numbers of the users in a cell and divides the users into strong interference users (edge users) and weak interference users (central users) according to the information uploaded by the users; and (3) the same set of pilot frequency is distributed to the weak interference users (central users) of different cells, and different pilot frequencies are distributed to strong interference users (edge users) of adjacent cells. According to the method, the same set of pilot frequency is multiplexed by central users of different cells so that the same pilot frequency is multiplexed by them and the utilization rate of the pilot frequency is increased; the edge users of the adjacent cells employ different pilot frequencies so that interferences are reduced; and in this way, the influence of pilot pollution is reduced, and the utilization rate of the pilot frequency is increased.

Description

【Technical field】 [0001] The invention belongs to the technical field of communication, and relates to a partial pilot multiplexing method for overcoming pilot pollution in a massive MIMO system. 【Background technique】 [0002] Today, when available spectrum resources are increasingly scarce, opening up new airspace resources has become one of the effective means to improve system capacity and performance. Therefore, how to make full use of airspace resources to meet the growing communication needs has always been a research hotspot in the field of wireless communication technology. [0003] In recent years, with the advancement of electronic devices and system integration technology, it has become possible to use large-scale antenna arrays at the base station, and correspondingly, massive MIMO technology has emerged. Existing studies have shown that: when the number of antennas configured at the base station tends to infinity, the receiving channel vectors corresponding to...

Claims

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Application Information

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IPC IPC(8): H04B7/04H04B7/06H04W72/04H04W4/02
CPCH04B7/0421H04B7/0697H04W4/02H04W72/04
Inventor 范建存李维启邓建国
Owner XI AN JIAOTONG UNIV
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