Information transmission method for multi-user MIMO relay system

An information transmission and relay system technology, applied in the field of wireless communication, can solve the problems of low practicability, not considering the security of the physical layer, not applicable to multi-user multi-directional relay channel transmission, etc. Effect

Active Publication Date: 2015-10-28
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, technical literature Cadambe V R, Jafar S A. "Interference alignment and degrees of freedom of the K-user interference channel," Information Theory, IEEE Transactions on, 54(8):3425-3441, 2008. ("K-user interference Channel Interference Alignment and System Degree of Freedom" IEEE Journal of Information Theory, Vol. 54, No. 8, Page: 3245-3441, 2008), the method of interference alignment in signal processing improves the system degree of freedom, but for each Users can only equip one antenna
Furthermore, Lee, N., J.-B. Lim, and H. Chun, “Degrees of freedom of the MIMO Y channel: Signal space alignment for network coding,” IEEE Trans.Inform.Theory, Vol.56, No. .7, 3332-3342, Jul.2010.("System degrees of freedom for MIMO Y channels: network coding with signal space alignment" IEEE Journal of Information Theory, Vol. 56, No. 7, Pages: 3332-3342, 2010), In this paper, interference alignment is improved and signal space alignment is proposed, which further improves the degree of freedom of the system and is suitable for multi-antenna networks. However, signal space alignment has extremely high restrictions on the number of users and antennas. Involves Physical Layer Security
Furthermore, the technical literatur

Method used

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  • Information transmission method for multi-user MIMO relay system
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  • Information transmission method for multi-user MIMO relay system

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Embodiment 1

[0029] See figure 2 , figure 2 It is a signaling flowchart of a method for transmitting information of a multi-user MIMO relay system according to an embodiment of the present invention. The method for transmitting information of a multi-user MIMO relay system in this embodiment is specifically:

[0030] S101. The first user sets the precoding matrix F according to channel state information (Channel state information, referred to as CSI) m .

[0031] The generation of the precoding matrix is ​​as follows:

[0032] h m (m=1,2,...,M) represents the channel matrix between user m and the relay, perform SVD decomposition on all channel matrices, and set the precoding matrix F in turn m .

[0033]S102. The first user uses the precoding matrix to encode the user message to form a transmission matrix X m .

[0034] Due to the role of the precoding matrix, the sending matrix X m Ability to eliminate interference from other users.

[0035] The generation of the first user sen...

Embodiment 2

[0048] See image 3 , image 3 It is a flow chart of a method for transmitting information of a multi-user MIMO relay system according to an embodiment of the present invention. This embodiment describes in detail the method for transmitting information of a multi-user MIMO relay system at the user side on the basis of the foregoing embodiments. Specific steps are as follows:

[0049] S201. The first user sets the precoding matrix F according to the CSI m , the precoding matrix F m A twiddle factor matrix K is set in , and the twiddle factor matrix K is used for channel matrix H m When doing Singular Value Decomposition (SVD for short), select the alignment direction in the alignment space of the feature direction.

[0050] S202, the first user according to the precoding matrix F m Form the sending matrix X for the pre-sending information m , and will send the matrix X m sent to the relay; and

[0051] S203. The first user receives the broadcast signal X sent by the re...

Embodiment 3

[0097] See Figure 4 , Figure 4 It is a flowchart of a method for transmitting information of a multi-user MIMO relay system according to an embodiment of the present invention. On the basis of the foregoing embodiments, this embodiment describes in detail the method for transmitting information of a multi-user MIMO relay system on the relay side . Specific steps are as follows:

[0098] S301. The relay receives the transmission matrix X sent by the first user and multiple second users. m ;Send matrix X m is the precoding matrix F set by the first user or the second user according to the channel state information CSI m Formed by processing pre-sent information

[0099] S302. The relay sends multiple matrixes X m Encoding to form coding chain Y R .

[0100] Similarly, the relay assigns the channel according to the matrix A m Generate coding chain, channel allocation matrix A m Process each signal and put the signal in the set direction, that is, design the channel al...

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Abstract

The invention relates to an information transmission method for a multi-user MIMO relay system. The information transmission method comprises that: a first user sets a precoding matrix K according to CSI, wherein the precoding matrix K is provided with a twiddle factor matrix K used for selecting the alignment direction in the alignment space of an eigen direction when performing singular value decomposition (SCD) on a channel matrix; the first user processes pre-sending information according to the precoding matrix in order to form a sending matrix and sends the sending matrix to a relay; the first user receives a broadcast signal transmitted from the relay; and the first user processes the broadcast signal according to the precoding matrix in order to obtain information transmitted from multiple second users. The information transmission method designs the eigen direction alignment precoding and the twiddle factor matrix by means of the SVD, performs decoding by means of a simple ZF decoding algorithm so as to effectively improve decoding performance when good transmission channel relevance is provided, and has a physical layer safe transmission characteristic.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to an information transmission method of a multi-user MIMO relay system. Background technique [0002] Multiple-Input Multiple-Output (MIMO for short) and relay technology, as important technical means of the third generation mobile communication technology (3G) and the fourth generation mobile communication technology (4G), have been widely valued and can effectively Expand network coverage and improve network service quality. It is an important means to improve the communication system by installing multiple antennas for users and relays, taking advantage of MIMO diversity and spatial multiplexing to improve system transmission performance. [0003] Many signal processing methods are used in multi-user MIMO relay systems to eliminate the influence of co-channel interference and obtain better transmission efficiency. When using the Zero-Forcing (ZF detection) decod...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04B7/06H04B7/15
CPCH04B7/0626H04B7/15H04L1/0625
Inventor 王勇唐李杨刘樵王喜媛朱辉李晖吕沙
Owner XIDIAN UNIV
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