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Pilot frequency optimization and allocation combined pre-coding method for multi-user multiple-input multiple-output

A technology of joint precoding and optimized allocation, which is applied in the directions of pilot signal allocation, transmission path sub-channel allocation, transmission system, etc., and can solve the problem of consuming time-frequency resources, etc.

Active Publication Date: 2016-06-15
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As the number of users increases, the pilot overhead used for channel parameter estimation increases linearly, especially in medium and high-speed mobile communication scenarios, the pilot overhead will consume most of the time-frequency resources

Method used

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  • Pilot frequency optimization and allocation combined pre-coding method for multi-user multiple-input multiple-output
  • Pilot frequency optimization and allocation combined pre-coding method for multi-user multiple-input multiple-output

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Embodiment

[0061] Take cell C 1 As an example, an embodiment of the present invention provides a joint precoding method for pilot optimization allocation for multi-user multiple input multiple output, which is specifically implemented through the following steps:

[0062] Step 1. The base station divides the set of all pilots {A} into two groups {{A1}, {A2}}. {A1}{A2} The pilots between and within the group are completely orthogonal, and within each group The number of pilot frequencies is greater than or equal to the number of terminals in a single cell, and the pilot allocation method is as follows figure 2 As shown, the cells of the same color block use the same set of pilots for a type of cell, the pilots of the same type of cells are completely reused, and the pilots of different types of cells are completely orthogonal, and no pilot pollution occurs. 1 Only the two adjacent cells C are generated by the terminals in the small area. 2 With C 3 .

[0063] Step 2. One cell corresponds to on...

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Abstract

The invention discloses a pilot frequency optimization and allocation combined pre-coding method for multi-user multiple-input multiple-output. A base station averagely divides all pilot frequencies into two pilot frequency subgroups; the pilot frequency subgroups are allocated to two kinds of cells; DOAs of terminals are obtained; intra-cell pilot frequency allocation is carried out; the terminals send pilot frequency information to cell base stations to which the terminals belong; the cell base stations obtain the channel information of terminals containing pilot frequency pollutions through channel estimation; the channel information is obtained according to the time division duplexing channel reciprocity; through estimating the DOAs of the terminals, the DOAs of the terminals are searched; the channel information of the terminals containing the pilot frequency pollutions are recalculated according to the DOAs, thus obtaining optimized channel information of the terminals; G terminals with relatively good channel quality are selected as user group centers; the distances between other terminals and the user group centers are calculated; the rest terminals are allocated according to the distance values; the user group centers are updated; all users are iterated and grouped; and data are sent after calculating the second-order statistics of the channels of the user groups. According to the method provided by the invention, the channel design is optimized; and the system performance is promoted.

Description

Technical field [0001] The present invention belongs to the technical field of wireless communication, and specifically relates to a pilot optimization allocation joint precoding method for multi-user multiple input and multiple output. Background technique [0002] With the rise of smart terminals and the enrichment of wireless data application services, the number of data users in wireless communication systems has increased significantly, and data content is no longer limited to traditional text or images. In the future, users will be interested in multimedia services such as high-definition video and mobile TV. The increasing demand for wireless network traffic has led to an explosive growth of wireless network traffic, which puts forward higher requirements for the network capacity of wireless communication systems. [0003] Compared with a traditional base station with less than 8 antennas, the base station in a large-scale multi-user multiple-input multiple-output system is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04B7/04H04B7/06
CPCH04B7/0452H04B7/0456H04B7/0617H04L5/0048H04L5/0094
Inventor 赵毅峰吴思颖黄联芬赵彩丹高志斌
Owner XIAMEN UNIV
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