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Spatial modulation MQAM signal detection method based on phase decision

A space modulation and signal detection technology, applied in the field of mobile communication, can solve the problems of many search targets, complicated steps, difficult practical application, etc., and achieve the effect of low complexity, low complexity, good theoretical and practical significance

Active Publication Date: 2017-12-29
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, this method searches too many targets, and the implementation steps are very complicated, so it is difficult to be practically applied in large-scale antenna systems.

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  • Spatial modulation MQAM signal detection method based on phase decision
  • Spatial modulation MQAM signal detection method based on phase decision
  • Spatial modulation MQAM signal detection method based on phase decision

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Embodiment Construction

[0020] The technical solutions in the embodiments of the present invention will be described clearly and in detail below with reference to the drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.

[0021] The technical scheme that the present invention solves the problems of the technologies described above is:

[0022] The invention proposes a space modulation MQAM signal detection method based on phase judgment. First, in the spatial modulation system, ML maximum likelihood estimation can be expressed as two nested search problems, that is, to search for the transmitted symbol s first, and then for the antenna index l, which can be expressed as From this formula, it can be seen that for the internal optimization problem That is, under the condition of given active antenna index l, solve the transmitted symbol s. For MQAM modulated signals, the internal optimization problem is still equivalent ...

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Abstract

The invention provides a spatial modulation MQAM signal detection method based on phase decision, and belongs to the technical field of mobile communication signal detection. A simplified maximum likelihood (ML) estimation method is given from the ML estimation demodulation aspect of two-dimensional vector quantization. A judgment is made by means of a phase of a modulation symbol according to the characteristic of an MQAM constellation diagram in order to provide the spatial modulation MQAM signal detection method (PDM) based on phase decision. Through adoption of the method, searching for a modulation symbol space in an ML joint detection method is avoided, and the complexity is lowered greatly. The method approaches the performance of ML, and has relatively low complexity and great theoretical and practical significance. The method has relatively good practical application significance to an antenna technology and a green communication technology.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a phase judgment-based space modulation MQAM signal detection method. Background technique [0002] SM (Spatial Modulation) is a new technology in the MIMO (Multiple Input Multiple Output) system. This technology can use the serial number of the transmitting antenna to transmit channel bits while avoiding inter-channel interference. Therefore, it has become one of the hot research topics. In the space modulation system, the information bits are divided into two parts, one part is mapped to the selected antenna number, and the other part is mapped to the traditional modulation constellation diagram, so the space dimension formed by the sending antenna number can be effectively used to transmit the information bits. In addition, the spatial modulation system only allows one antenna to be activated in the same transmission time slot, and the other antennas remain silent, thus eff...

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Application Information

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IPC IPC(8): H04L27/38H04L27/36
CPCH04L27/36H04L27/38
Inventor 陈发堂刘燕李小文王丹刘宇王华华冯永帅李玉河
Owner CHONGQING UNIV OF POSTS & TELECOMM