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Estimate-and-forward relay transmission method based on unitary space-time modulation

A transmission method and estimated forwarding technology, applied in transmission systems, digital transmission systems, active electrical relay systems, etc., can solve problems such as error propagation

Inactive Publication Date: 2014-07-09
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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  • Estimate-and-forward relay transmission method based on unitary space-time modulation
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  • Estimate-and-forward relay transmission method based on unitary space-time modulation

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Embodiment Construction

[0054] The present invention is described in detail below in conjunction with accompanying drawing:

[0055] The system model of multi-relay parallel system is as follows figure 1 shown. 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.

[0056] 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.

[0057] 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:

[0058] ...

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Abstract

The invention discloses an estimate-and-forward relay transmission method based on the unitary space-time modulation. The method comprises the following steps that under the fast fading channel environment of all unknown channel state messages of nodes in the relay network, a source node sends a unitary space-time symbol to the relay nodes for communication; the kth relay node correspondingly processes the received signal, and relay nodes solve conditional expectation for the source sent signal on the premise of the known received relay signal, and the estimated signal, namely the conditional expectation is forwarded to a target node; when the relay nodes forward the estimated signal, uncertain estimated signals are included, and soft information is provided for the decoding of the target node; based on the signal orthogonal decomposition principle, the source signal and a non-relevant noise signal in the received signal of the target node are distinguished, and the power ratio of the source signal to the non-relevant noise signal is the general signal-to-noise ratio of the target node. According to the scheme, when the relay nodes forward the estimated signal with uncertainty, soft information is provided for decoding of the target node, and the system reliability is improved.

Description

technical field [0001] The invention relates to an estimated forwarding relay 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 this time. Relay technology can provide energy at each relay node to maintain long-distance communication transmission. In the traditional...

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Application Information

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IPC IPC(8): H04L1/00H04B7/15
Inventor 曹叶文刘倩倩
Owner SHANDONG UNIV
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