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An iterative bd precoding method based on projection operator

A projection operator and precoding technology, applied in electrical components, radio transmission systems, transmission systems, etc., can solve the problems of high computational complexity and low efficiency in iterative steps

Active Publication Date: 2019-05-14
SOUTH CHINA UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it can be seen from Table 4 above that the complexity series in Method 3 is N T ≥Kn r , when the number of users K is large, the computational complexity of the iterative steps in method 3 is still high
It can be seen that several existing BD precoding methods are less efficient in eliminating user interference

Method used

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  • An iterative bd precoding method based on projection operator
  • An iterative bd precoding method based on projection operator
  • An iterative bd precoding method based on projection operator

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Embodiment

[0097] In order to facilitate the description of the method of the present invention, the following assumptions are made to the MU-MIMO system conditions: as figure 1 As shown, the user configures the same number of antennas, that is, n k =n r ,k=1,2,...,K; the number of transmitting antennas on the base station side is not less than the total number of receiving antennas, that is, N T ≥Kn r ; The base station transmits data to K users at the same time, and each user receives n r data streams, the base station adopts equal power distribution.

[0098] The base station obtains the channel information of K users, and the MIMO channel matrix H of the kth user k It is formula (10).

[0099]

[0100] where h ij Indicates the channel coefficient from the j-th transmit antenna of the base station to the i-th receive antenna of the user. The received signal of the kth user is formula (11).

[0101] the y k =H k Tx+n k (11)

[0102] Among them, x is the transmitted data...

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Abstract

The invention discloses an iteration BD precoding method based on a projection operator. The method includes the following steps of firstly, conducting channel estimation for community users according to pilot signals issued by a base station to obtain downlink channel information from the base station to the users, then feeding the downlink channel information back to the base station through an uplink, and directly obtaining the downlink channel information of the users through the base station; secondly, calculating the zero-space projection operator of interference channel matrixes of the users through multiple times of iteration updating; thirdly, sequentially calculating projection channel matrixes of all the user according to the zero-space projection operator of the interference channel matrixes of the users; fourthly, sequentially conducting Schmidt orthogonalization on the projection channel matrixes of all the users to obtain a group of orthogonal bases of the projection channel matrixes to serve as BD precoding matrixes of the users. The method has the advantage that on the premise of ensuring that the system performance is not damaged, the calculation complexity of BD precoding is effectively reduced.

Description

technical field [0001] The present invention belongs to the technical field of wireless communication, and in particular relates to a block diagonalization (Block Diagonalization, BD) precoding technology in an LTE downlink multi-user multiple-input multiple-output (abbreviated as MU-MIMO) system. Background technique [0002] MIMO technology is regarded as a key technology for future wireless communication systems due to its high rate and high reliability. It has been proved by theory and practice that MIMO technology can greatly improve system throughput without increasing additional system bandwidth and transmission power. At present, MIMO technology has been included in many wireless communication technology standards, such as IEEE 802.11n, IEEE802.16, 3GPP LTE and 3GPP LTE-A. [0003] The meaning of the term MIMO is relatively broad. The point-to-point communication between a base station and a user is called SU-MIMO (Single-User MIMO, single-user MIMO). Several users ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456
CPCH04B7/0452H04B7/0456
Inventor 李相思冯穗力丁跃华张远见胡应添李馨
Owner SOUTH CHINA UNIV OF TECH