Pre-coding method for MIMO multi-relay system with antenna correlation and channel estimation errors

A channel estimation error and relay system technology, applied in the field of linear precoding, can solve the problem that the estimation error is at a very small stage

Active Publication Date: 2018-11-06
景晨
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Problems solved by technology

In recent years, researches on MIMO multi-relay emerge in endlessly, but most of them are based on the ideal channel relay structure, and the

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  • Pre-coding method for MIMO multi-relay system with antenna correlation and channel estimation errors
  • Pre-coding method for MIMO multi-relay system with antenna correlation and channel estimation errors
  • Pre-coding method for MIMO multi-relay system with antenna correlation and channel estimation errors

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Embodiment Construction

[0061] The present invention will be further described below in conjunction with the accompanying drawings.

[0062] The present invention proposes a linear precoding method for MIMO multi-relay systems with direct transmission paths, with the purpose of obtaining more optimized system bit error rate performance by considering the problems of antenna correlation and channel estimation errors in channels in actual situations.

[0063] In order to make the principle of the present invention clearer, firstly, the working principle of the MIMO multi-relay system adopted in the present invention is briefly introduced. System model such as figure 1 As shown, it consists of a transmitting node, a receiving node and multiple relay nodes, and the communication nodes S, k, D are respectively equipped with N 1 , N 2 , N 3 root antenna, the relay node has K relay stations. combine figure 2 The schematic diagram of signal transmission, two relay stations are set up, the transmitting ...

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Abstract

The invention discloses a pre-coding method for a MIMO multi-relay system with antenna correlation and channel estimation errors. According to the method, with a condition that antenna correlation andestimation errors exist on channels considered, and the maximum power of a transmitting end and a relay end adopted as a constraint, firstly, a relay system based on channel estimation errors and antenna correlation, and a channel model are given, a constrained optimization function satisfying the MMSE criterion and power constraint is constructed, the closed-form solutions of a transmitting endpre-coding matrix, a relay pre-coding matrix and a receiving node processing matrix are given; a joint iterative method is adopted to perform alternate update until the algorithm converges, and the optimal solutions of each node matrix are obtained; and the iterative method has good convergence and is easy to implement. Since a condition that antenna correlation and channel estimation errors may both exist in a direct transmission path and two hops of channels in an actual situation is considered, the linear pre-coding method provided by the invention is more in line with the actual transmission situation of the MIMO multi-relay system.

Description

Technical field: [0001] The invention relates to a linear precoding method for a MIMO multi-relay system with direct transmission paths, in particular to a precoding method for a MIMO multi-relay system with antenna correlation and channel estimation errors. Background technique: [0002] Multiple-input multiple-output (MIMO) relay communication technology has attracted widespread attention due to its wide coverage, high-speed transmission, effective resistance to channel fading, and improvement of service quality for cell edge users. As an adaptive technology that can improve system performance, precoding technology has become a research hotspot at present. Integrating existing wireless communication technologies such as MIMO and relay, and further tapping their potential advantages are the current hot topics of 5G technology. [0003] In the case of sufficient coverage, it is necessary to consider the direct transmission path between the transmitting end and the receiving...

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Application Information

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IPC IPC(8): H04B7/0413H04B7/0456H04B17/309H04B17/391
CPCH04B7/0413H04B7/0456H04B17/309H04B17/391
Inventor 景晨
Owner 景晨
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