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An improved multi-cell pilot allocation method based on mse

A technology of pilot frequency allocation and allocation method, which is applied in the directions of pilot signal allocation, transmission path sub-channel allocation, transmission path multiple use, etc., and can solve the problems of low average reachability and low rate, minimum reachability and low rate of users, etc.

Active Publication Date: 2020-10-16
单旭
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Problems solved by technology

The pilot allocation scheme based on user fairness is to maximize the minimum reachability and rate among users, and the average reachability and rate of users in this scheme are low, while the pilot allocation scheme based on user reachability and rate maximization will make the user's Minimum reachable and lower rate

Method used

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  • An improved multi-cell pilot allocation method based on mse
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  • An improved multi-cell pilot allocation method based on mse

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Embodiment Construction

[0031] The present invention will be further described below with reference to the drawings and embodiments, but it is not limited thereto.

[0032] Examples of the invention figure 1 , 2 As shown, the MSE-based all-user pilot allocation scheme and the MSE-based low-complexity pilot allocation scheme, users are set up with 3 cells of massive MIMO pilot allocation, where each cell has K users, and each user Equipped with a single antenna, the base station is equipped with countless antennas, the system adopts the TDD system, and the reciprocity of the channel is considered at the same time, assuming that K pilots are multiplexed in 3 cells. Consider a multi-cell multi-user massive MIMO system composed of hexagons. Each cell consists of a base station with M antennas and K single-antenna users. Then the channel from the kth user in the jth cell to the base station in the l cell can be Modeled as

[0033]

[0034] Where g ljk Composed of small-scale fading coefficients, β ljk Is the...

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Abstract

The invention discloses a multi-cell pilot frequency improved allocation method based on MSE. The method is implemented by the following steps: 1, using every L cells as a group of clusters, and marking as 1; 2, for users in each cell within the clusters, calculating a large-scale fading coefficient beta<ljk> from each user to each cell base station; 3, when the base station antenna quantity tendsto be infinite, determining the signal to noise ratio of a kth user in a cell l as shown in the description, and determining the achievable rate of each user as rlk=log<2>(1+SINR<lk>); 4, calculatingthe achievable rates of all users of all cells within each cluster as shown in the description, and calculating the average achievable rate of each user as shown in the description; and 5, allocatingpilot frequency with an enumeration method or a greedy algorithm to obtain an optimal allocation scheme. A pilot frequency allocation scheme based on the MSE is adopted, so that the average achievable rate of the users can be increased. Meanwhile, the greedy algorithm and a random allocation method are combined as an improvement to lower the complexity, so that the complexity is lowered from 0((K!)<L>) to 0(K x K<L>).

Description

Technical field [0001] The present invention relates to a pilot distribution method, which belongs to the application field of communication technology, and realizes an effective compromise between a pilot distribution scheme based on the maximum average reachability and rate and a pilot distribution scheme based on user fairness. The pilot allocation scheme of the MSE and the improved allocation scheme, that is, by calculating the minimum value of the maximum value of the MSE of the user achievable rate of the pilot allocation scheme, the optimal pilot allocation scheme. Background technique [0002] In recent years, a new type of massive MIMO technology has received widespread attention. The main feature of the system is that the base station antenna is equipped with dozens or even hundreds of antennas, so that the system can improve the spectrum utilization, energy efficiency and capacity without increasing the spectrum and bandwidth. In addition, the system can eliminate use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00
CPCH04L5/0048
Inventor 曹海燕周冬许方敏王秀敏
Owner 单旭
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