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A precoding method for mimo two-way relay system with channel feedback delay and estimation error

A technology of estimation error and channel feedback, which is applied in the field of precoding of MIMO bidirectional relay systems, and can solve the problems of little research on MIMO relay systems.

Active Publication Date: 2020-08-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

In recent years, research on MIMO relays has emerged in an endless stream, but most of them are based on the complete channel relay structure, and there are few researches on the MIMO relay system considering the channel feedback delay and estimation error

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  • A precoding method for mimo two-way relay system with channel feedback delay and estimation error
  • A precoding method for mimo two-way relay system with channel feedback delay and estimation error
  • A precoding method for mimo two-way relay system with channel feedback delay and estimation error

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Embodiment Construction

[0071] The purpose and characteristics of the present invention will be described in detail below through specific implementation examples in conjunction with the accompanying drawings. These specific implementations are illustrative and not restrictive.

[0072] The present invention proposes a linear precoding method for a MIMO two-way relay system with feedback delay and estimation error in the channel. The purpose is to obtain a more optimized system bit error rate performance by considering the problem of feedback delay and estimation error in the channel in actual situations.

[0073] In order to make the principle of the present invention clearer, firstly, the working principle of the MIMO two-way relay system adopted in the present invention is briefly introduced. System model such as figure 1 As shown, it consists of two communication nodes and a relay node, the communication node S 1 and S 2 Equipped with n s Antennas, relay nodes are equipped with n r root anten...

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Abstract

The invention provides a pre-coding method of an MIMO bidirectional relay system with channel feedback delay and estimation errors. According to the method, under the condition that relay transmitting power is limited, an optimization problem utilizing a minimum mean square error as the criterion and utilizing a pre-coding matrix as a variable is designed to reduce an MES expression after the channel feedback delay and the estimation errors are considered, and a closed-form solution of a relay pre-coding matrix and a receiving node processing matrix is provided. In the method, alternate update is carried out by using a combined iteration method until algorithm convergence to obtain an optimal solution of node matrixes. The iteration method is good in astringency and is easy to implement; and in the linear pre-coding method provided by the invention, the situation that two skip channels have the channel feedback delay and the estimation errors in actual conditions is considered, thereby better satisfying the actual transmission conditions of the MIMO bidirectional relay system.

Description

Technical field: [0001] The invention relates to a linear precoding method for a MIMO relay system, in particular to a precoding method for a MIMO two-way relay system with channel feedback delay and estimation error, which belongs to the field of wireless communication. Background technique: [0002] Multiple-input multiple-output (MIMO) technology is a communication technology that places multiple antennas at the transceiver end of the communication system, which can double the capacity and spectrum of the system without increasing the bandwidth. Utilization rate is the key technology of the fourth generation mobile communication system. Introducing relay technology into MIMO system, combined with preprocessing technology can expand the coverage of wireless network and improve system throughput. Integrating existing wireless communication technologies such as MIMO and relay, and further tapping their potential advantages are the current hot topics of 5G technology. The M...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456H04B17/391
CPCH04B7/0456H04B17/391Y02D30/70
Inventor 陈小敏苏君煦朱秋明方竹胡续俊陈兵
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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