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Mutual information forwarding relay transmission method based on unitary space-time modulation

A transmission method, forwarding and relaying technology, applied in the field of soft information forwarding and relaying, which can solve problems such as error propagation

Inactive Publication Date: 2014-07-16
SHANDONG UNIV
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Problems solved by technology

In the traditional relay method, the amplification and forwarding relay method (AF) amplifies the noise at the same time; the decoding and forwarding relay method (DF) has serious error propagation phenomenon at low signal-to-noise ratio

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  • Mutual information forwarding relay transmission method based on unitary space-time modulation
  • Mutual information forwarding relay transmission method based on unitary space-time modulation
  • Mutual information forwarding relay transmission method based on unitary space-time modulation

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Embodiment Construction

[0049] The present invention is described in detail below in conjunction with accompanying drawing:

[0050] The system model of multi-relay parallel system is as follows figure 1 shown. As shown in the figure, the multi-relay system consists of source node S, destination node D and K parallel relay nodes R 1 , R 2 ,...,R K constitute. Suppose the source node is configured with M transmitting antennas, the destination node is configured with N receiving antennas, and each relay node is configured with K R root antenna. The generation of the unitary space-time constellation adopts a systematic design method based on DFT.

[0051] Taking the kth relay node as an example, the communication block diagram of the multi-antenna relay system based on USTM is as follows: figure 2 shown. In the first stage, the source node sends unitary space-time symbols to each relay node for communication, at T×K of the kth relay node R Dimension receiving matrix R k can be written as:

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Abstract

The invention discloses a mutual information forwarding relay transmission method based on unitary space-time modulation. The mutual information forwarding relay transmission method based on unitary space-time modulation comprises the following steps that in a parallel relay multi-antenna network with all nodes not knowing channel state information, a source node sends unitary space-time symbols to each relay node for communication; the relay nodes process received signals correspondingly, and the relay nodes forward soft signals combining hard decision signals and a mutual information value to a destination node and provide soft information for decoding of the destination node; based on a signal orthogonal decomposition principle, source signals in the signals received by the destination node are distinguished from non-correlated noise signals, and the power ratio of the source signals and the non-correlated noise signals is the general signal-to-noise ratio of the destination node. The relay nodes forward the soft signals combining the hard decision signals and the mutual information value, and provide the soft information for decoding of the destination node, and the reliability of the system is improved.

Description

technical field [0001] The invention relates to the field of soft information forwarding and relaying in a multiple-input multiple-output (MIMO) system, in particular to a mutual information forwarding and relaying transmission method based on unitary space-time modulation. Background technique [0002] In environments such as high-speed railway communication and aviation communication, mobile terminals move at high speed and the channel changes very fast, making it difficult to obtain accurate channel state information (CSI). At this time, coherent space-time codes are no longer applicable. The unitary space-time modulation (USTM) technology does not need to know the CSI at both the transmitting end and the receiving end, and the bit error performance is still good in the fast fading channel. However, long-distance transmission or "shadowing effect" will cause the signal-to-noise ratio to be greatly reduced, and unitary space-time modulation will lose its superiority at thi...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04L1/00H04B7/04
Inventor 曹叶文刘倩倩
Owner SHANDONG UNIV
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