Precoding method comprising direct transmission link in multi-user bidirectional MIMO relay system

A relay system and direct link technology, applied in the field of wireless relay communication, can solve the problems of non-negligible contribution, high implementation complexity, neglect of direct links, etc., to achieve the effect of improving performance

Active Publication Date: 2019-03-15
HARBIN ENG UNIV
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Problems solved by technology

[0003] Most of the published literature on point-to-multipoint MIMO relay communication ignores the direct links from the source to all users. However, in practical systems, no matter whether it is uplink or downlink, direct links exists, and its contribution cannot be ignored
Literature Sun Q, Li L. Weighted Sum Rate Maximization for Downlink Multiuser Relay Network with Direct Link [J]. Wireless Personal Communications, 2014, 75(1): 369-384. Researched the joint prediction of unidirectional transmission including direct link coding, but its research is only a simple downlink, and the implementation complexity is high

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  • Precoding method comprising direct transmission link in multi-user bidirectional MIMO relay system
  • Precoding method comprising direct transmission link in multi-user bidirectional MIMO relay system
  • Precoding method comprising direct transmission link in multi-user bidirectional MIMO relay system

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[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] The present invention proposes a precoding design scheme based on a full channel including a direct transmission link in the bidirectional MIMO relay communication scenario of multi-users at the transmitting / receiving end, aiming at the half-duplex mode of bidirectional transmission of the relay.

[0033] The precoding algorithm of the multi-user two-way MIMO relay system including the direct transmission link, the model consists of a transmitter user, K receiver users and a relay node, such as figure 1 shown. The user at the transmitting end and the user at the receiving end are equipped with the same number of antennas as N k , the relay node is equipped with N r Antennas. To simplify the analysis, it is assumed that the relay node adopts the AF relay protocol. In the system model of two-way transmission, the direct transmission link between the transmitte...

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Abstract

The invention provides a precoding method comprising a direct transmission link in a multi-user bidirectional MIMO relay system, and belongs to the technical field of wireless relay communication. Theinvention provides a precoding design scheme comprising a direct transmission link between an information source and multiple users based on a complete channel in view of a bidirectional relay communication system in a half-duplex mode, and a relay precoding matrix is optimized by QR decomposition; the optimization of a user precoding matrix is based on MSMSE, an optimization objective equation is established, and the optimization problem is converted into a QCQP problem for optimization; the optimization of a client receiving filter matrix is to directly solve optimal expressions of an information source end and the client by using a partial derivative method; and finally, the user precoding matrix and the receiving filter matrix are jointly iterated to convergence to obtain an optimal precoding matrix. In the method, the contribution of the direct transmission link to the system is considered, and the performance of the system can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of wireless relay communication, and in particular relates to a precoding method including a direct transmission link under a multi-user two-way MIMO relay system. Background technique [0002] Due to the potential high rate and large capacity of the multiple-input multiple-output (MIMO) system, it has attracted widespread attention and has become a key technology for future mobile communication systems. Since the European Union launched the "5G NOW" project, countries around the world have stepped up research on 5G communication technology. my country has also added the research work of 5G communication technology to the "863" plan, the key technology of which is MIMO technology. MIMO technology is a communication technology method that does not need to increase the wireless frequency bandwidth, but can provide the same gain effect as increasing the bandwidth, and the relay communication technology can imp...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0452H04B7/0456
CPCH04B7/0452H04B7/0456
Inventor 禹永植侯培迟郭立民彭立群
Owner HARBIN ENG UNIV
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