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Signal subspace orthogonal alignment method under high-order modulation

A technology of signal subspace and high-order modulation, applied in multi-carrier systems, radio transmission systems, electrical components, etc., can solve problems such as users' inability to decode correctly, fuzzy detection, etc.

Active Publication Date: 2019-06-14
XIDIAN UNIV
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Problems solved by technology

[0006] On the other hand, the use of high-order modulation at the transmitting end can effectively improve the spectral efficiency of the system, but high-order modulation will cause fuzzy detection problems in the process of relay network coding at the physical layer, resulting in users being unable to decode correctly and obtain all need information

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  • Signal subspace orthogonal alignment method under high-order modulation
  • Signal subspace orthogonal alignment method under high-order modulation
  • Signal subspace orthogonal alignment method under high-order modulation

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Embodiment Construction

[0068] The present invention will be described in further detail below in conjunction with specific examples, but the embodiments of the present invention are not limited thereto.

[0069] An embodiment of the present invention provides a method for orthogonally aligning signal subspaces under high-order modulation, and the steps are as follows:

[0070] When the signal subspace is orthogonally aligned, the order of the spatial direction formed by the interactive signal is determined;

[0071] Using the determined orthogonal projection space of the signal space direction, select an appropriate precoding vector;

[0072] The physical layer network coding technology is applied to solve the problem of fuzzy mapping at the relay end after high-order modulation of the transmitted signal.

[0073] In one embodiment of the present invention, the signal subspace orthogonal alignment method under high-order modulation specifically includes:

[0074] Step 1, establishing a MIMO Y chan...

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Abstract

The invention belongs to the field of wireless communication and network coding, and particularly relates to a signal subspace orthogonal alignment method under high-order modulation, which comprisesthe following specific steps: when signal subspaces are subjected to orthogonal alignment, determining a spatial direction sequence formed by interactive signals; selecting an appropriate precoding vector by using the orthogonal projection space of the determined signal space direction; after a physical layer network coding technology is applied to perform high-order modulation on a sending signal, the problem of fuzzy mapping of a relay end is solved. According to the invention, the fuzzy mapping problem generated by the relay under high-order modulation is solved, and the communication efficiency of the system is improved.

Description

technical field [0001] The invention belongs to the field of wireless communication and network coding, in particular to a method for orthogonally aligning signal subspaces under high-order modulation. Background technique [0002] The Signal Space Alignment (SSA) technology aligns the paired independent signal streams in the wireless airspace to the same subspace in pairs, reducing the spatial dimension occupied by the signal and improving the utilization of space resources. The relay performs network coding (Network Coding, NC) processing on each pair of aligned signals, and performs joint coding processing on multiple information sources through the relay node, which improves the spectrum efficiency. The physical layer network coding technology makes use of the electromagnetic waves that are naturally superimposed together. With the help of network coding and decoding operations, it allows multiple sources to send information at the same time, further improving the throug...

Claims

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Application Information

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IPC IPC(8): H04B7/0456H04B7/155H04L27/34
Inventor 王勇康志琴王喜媛张跃宇刘樵
Owner XIDIAN UNIV
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