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Pre-coding method of MIMO relay system having channel estimation error and antenna correlation

A channel estimation error, relay system technology, applied in the field of precoding of MIMO relay system, can solve problems such as being in a very small stage

Inactive Publication Date: 2016-05-11
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 relay structures based on complete channels, while research on MIMO relay systems related to channel estimation errors and antenna correlations existing in the channel is still at a very small stage

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  • Pre-coding method of MIMO relay system having channel estimation error and antenna correlation

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Embodiment Construction

[0044]The invention aims at the MIMO relay system with channel estimation error and antenna correlation, and studies the precoding design method of the transmitting end and the relay end. The purpose is to obtain a more optimized system bit error rate performance by considering channel estimation errors and antenna-related problems in actual situations.

[0045] In order to make the principle of the present invention clearer, firstly, the working principle of the MIMO relay system adopted in the present invention is briefly introduced. The MIMO relay system model is as figure 1 As shown, it consists of three parts: the transmitter, the relay and the receiver, where the transmitter, the relay and the receiver have n s , n r , n d Antennas, and satisfy n s ≤min(n r ,n d )condition. combine figure 2 The schematic diagram of signal transmission, the transmitting end, the relay end and the receiving end are respectively equipped with 4 antennas, and the transmission inform...

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Abstract

The invention discloses a pre-coding method of a MIMO relay system having a channel estimation error and antenna correlation. Under a condition that both the power of a transmitting end and the power of a relay end are limited, closed-form solutions of a pre-coding matrix of the transmitting end, a pre-coding matrix of the relay end and a processing matrix of a receiving end are obtained by derivation in a manner of taking a minimum mean square error as a criterion; therefore, the system performance can be improved well; a joint iterative algorithm for calculating the pre-coding matrix of the transmitting end, the pre-coding matrix of the relay end and the processing matrix of the receiving end is given; the joint iterative algorithm has good convergence and practical value and is easy to implement; the MIMO relay system is combined with problems of the channel estimation error and the antenna correlation; the condition that incomplete channel state information exists in a practical condition is considered; the pre-coding method of the MIMO relay system under the condition of the channel estimation error and the antenna correlation is implemented to improve the performance of the MIMO relay system based on the incomplete channel state information condition; and thus, the pre-coding method has wide application prospect.

Description

Technical field: [0001] The invention belongs to the field of wireless communication, relates to a precoding method of a MIMO relay system, and more specifically relates to a precoding method of a MIMO relay system with channel estimation error and antenna correlation. Background technique: [0002] With the increase of users' demand for various real-time multimedia services, especially the rapid development of Internet technology since the 21st century, the traditional single-antenna transmission technology has been unable to meet the requirements of wireless services. Multiple-Input Multiple-Output (MIMO) technology greatly improves the frequency efficiency of communication systems and improves the reliability of communication links, and has become a key core technology in the field of wireless communication. The relay technology can effectively expand the coverage of the communication network and improve the capacity of the communication system. The introduction of the re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04
CPCH04B7/0452H04B7/0456
Inventor 陈小敏朱益民苏君煦朱秋明胡续俊方竹
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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