Inter-user interference rejection pre-coding method for multi-user joint transmission

A joint transmission and interference suppression technology, applied in the field of precoding, can solve problems such as interference between users, affecting system performance, and limiting the degree of freedom of the application system

Inactive Publication Date: 2013-03-13
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] Non-coherent joint transmission technology, base stations in the cooperative cluster use local CSI for precoding, and the information interaction overhead between base stations is small, but when there are multiple service users, inter-user interference will seriously affect system performance
Traditional BD and SLNR precoding methods can suppress inter-user interference, but their application will be limited by the number of antennas configured in the system or the degree of freedom of the system space

Method used

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  • Inter-user interference rejection pre-coding method for multi-user joint transmission
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  • Inter-user interference rejection pre-coding method for multi-user joint transmission

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Embodiment Construction

[0019] Consider a cooperative multi-point multi-user joint transmission scenario, the number of base stations in the cooperative cluster is M (M is a positive integer), and the number of antennas per base station is M i , i=1,...,M; the number of service users is N, and the number of antennas per user is N k , k=1,...,N, where N is a positive integer; according to the joint transmission requirements, each base station needs to generate N precoding matrices, and ensure that the total number of transmitted data streams does not exceed the number of antennas of any base station, namely L k is the transmission data stream of the Kth user.

[0020] Using the block fading channel model, the channel matrix H k，i (N k × M i ) is full rank and each element is independent of each other. It is assumed that different user data information are independent of each other, that is, (s k is the signal vector of the Kth user, s l is the signal vector of the Lth user, H is the conjugat...

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Abstract

The invention provides a pre-coding method for restraining inter-user interference. The pre-coding method mainly comprises firstly designing a linear merging matrix of a user side, enabling the linear merging matrix to be combined with feedbacks of a customer satisfaction index (CSI), and reasonably using degree of spatial freedom; then precoding each user at each base station end, restraining user interference leaked from each user to other users; and finally adopting a maximization standard of signal-to-leakage-and-noise ratio (SLNR) to conduct joint optimization on an obtained precoding matrix and an obtained channel matrix and further promote system performance. The pre-coding method is not obvious in improvement of complexity and has practical application value compared with the SLNR precoding, the inter-user interference is effectively restrained, bit error rate performance and transmission rate are both obviously improved along increase of the signal noise ratio (SNR), and accordingly the precoding performance is better than BT precoding.

Description

Technical field: [0001] The invention belongs to the design of a transmission method of a wireless communication system, and relates to a precoding method of a coordinated multi-point joint transmission system in a multi-user scenario. Background technique: [0002] The joint transmission technology in the cooperative system can enable multiple base stations to transmit data to the target user at the same time by sharing the necessary service information among the base stations in the cooperative cluster, thereby converting the inter-cell interference existing in the traditional network into a useful signal, which can significantly improve the efficiency of the cell. Data rate and spectral efficiency for edge users. According to whether the channel state information (Channel State Information, CSI) is shared in the cooperative cluster, the joint transmission technology can be divided into coherent joint transmission and non-coherent joint transmission. For coherent joint tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06
Inventor 任品毅徐大同张国梅杜清河
Owner XI AN JIAOTONG UNIV
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