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Pilot distribution method based on artificial fish swarm algorithm

An artificial fish swarm algorithm and pilot frequency allocation technology, which can be used in pilot signal allocation, transmission path sub-channel allocation, digital transmission systems, etc., and can solve problems such as limited search characteristics and low complexity.

Active Publication Date: 2016-03-30
SHANDONG UNIV
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Problems solved by technology

Literature "Pilot scheduling schemes for multi-cell massive multiple-input multiple-output transmission" [S.Jin, M.Li, Y.Huang, Y.Du, X.Gao, "IET Communications", vol.9, issue5, pp.689–700, 2015.] Aiming at improving the users and speed in the cell, the pilot allocation strategy with lower complexity is studied, mainly including the greedy algorithm, the tabu search algorithm and the joint algorithm of the two, but the search characteristics of the above algorithms are often limited by the local optimum. Excellent solution

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  • Pilot distribution method based on artificial fish swarm algorithm
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  • Pilot distribution method based on artificial fish swarm algorithm

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[0030] Examples of the present invention figure 1 As shown, a pilot allocation method based on the artificial fish swarm algorithm is used for pilot allocation of a large-scale antenna system with L cells, where each cell contains a base station and K users, and each user is equipped with a single Antennas, the base station is equipped with nearly infinite number of antennas, the system communication adopts the time division duplex mechanism, and the channel reciprocity is considered at the same time, assuming that there are K pilots multiplexed in L cells, with the goal of improving the system and rate, through The artificial fish swarm algorithm is used to obtain the optimal pilot allocation scheme. First, the pilot sequence in each cell is randomly allocated, and the pilot allocation scheme of each cell is regarded as an artificial fish. The pilot allocation of the entire large-scale antenna system As an artificial fish school; secondly, the initial artificial fish are fora...

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Abstract

The invention relates to a pilot distribution method based on an artificial fish swarm algorithm. The concept of artificial fish is introduced at first, each artificial fish corresponds to a pilot distribution scheme of a cell in a large-scale antenna system, different pilot distribution schemes are generated by exchanging codes, in order to calculate a user sum rate in the system under the different pilot distribution schemes, and meanwhile, a criterion of survival of the fittest is adopted to retain a pilot distribution sequence with a relatively large system sum rate; tailgating and clustering operations are carried out on the retained pilot distribution sequence, the system sum rate is evaluated after the corresponding operations, and the pilot distribution sequence with the relatively large rate is sent to a bulletin board; and finally, the steps are repeated, the survival of the fittest and the artificial fish tailgating and clustering behaviors are carried out for multiple turns to obtain the pilot distribution scheme with the largest user sum rate in the system. The pilot distribution method provided by the invention breaks the limitation of the local optimal solution, the user sum rate is maximized, and the pilot pollution influence and the complexity of the pilot distribution policy of the large-scale antenna system can be reduced.

Description

technical field [0001] The invention relates to a pilot allocation method based on an artificial fish swarm algorithm in a large-scale antenna system, belonging to the field of wireless communication. Background technique [0002] A large-scale antenna wireless communication system uses a large number of antennas at the base station to serve multiple end users at the same time using the same time-frequency resource. Theoretical research shows that this architecture can greatly improve the spectrum efficiency and energy efficiency of the system, and when the number of antennas is large enough, it can eliminate the internal interference of the cell and reduce the impact of noise on system performance. While obtaining the above advantages, there are still certain problems in the large-scale antenna system, such as the pilot pollution problem, that is, when multiple user terminals adopt the pilot frequency multiplexing scheme, pilot frequency pollution will occur, and its system...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00
CPCH04L5/0048
Inventor 白智全张标苏英彦孔凡堂彭珊珊
Owner SHANDONG UNIV
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