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Space-time shift keying method based on code index modulation

A technology of shift keying and code indexing, applied in the field of communication, can solve problems such as lack of transmit diversity gain, consumption of large antenna resources, system bit error rate performance to be improved, etc., to reduce detection complexity and reduce transmit antenna radio frequency number, the effect of good bit error rate performance

Inactive Publication Date: 2021-12-14
中国计量大学上虞高等研究院有限公司 +1
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Problems solved by technology

However, in the CIM-SM system, since the SM only activates one antenna for each transmission, this scheme does not have transmit diversity gain, and the bit error rate performance of the system needs to be improved
The CIM-SM system has the problem of consuming a large amount of antenna resources. At the same time, the transmission rate and energy consumption of the system need to be further improved.

Method used

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  • Space-time shift keying method based on code index modulation
  • Space-time shift keying method based on code index modulation
  • Space-time shift keying method based on code index modulation

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Embodiment Construction

[0104] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0105] Such as figure 1 It is a schematic diagram of the model of the CIM-STSK scheme of the present invention.

[0106] A space-time shift keying method based on code index modulation, constructing a t root transmitting antenna, N r root receive antenna, Q dispersion matrices, M-QAM modulation symbols and log 2 (L) CIM-STSK system of spreading codes, L is the number of optional spreading codes; the receiving end of the system uses the autocorrelation property of spreading codes to take despreading first and then detect the dispersion matrix and modulation symbols.

[0107] The working method of the CIM-STSK system is:

[0108] 1.1) the binary information vector to be sent by the transmitter of the CIM-STSK system is a vector b whose dimension is b * 1; vector b is subdivided into three blocks: b1=log 2 (Q) bits, b2=log 2 (M) bit sum b3=...

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Abstract

The invention discloses a space-time shift keying (STSK) method based on code index modulation (CIM). According to the scheme, a bit stream is divided into three parts: selection of a dispersion matrix, selection of a modulation symbol and selection of a spreading code. Therefore, besides the traditional constellation symbols are transmitted, the information bits are also mapped to the Hadamard code and the dispersion matrix index, and the transmission efficiency of the scheme is improved. In addition, a mathematical expression of the bit error rate of the CIM-STSK system is deduced in detail, and the bit error rate performance of the scheme is analyzed. Simulation results show that compared with CIM-SS, STSK and CIM-SM schemes, the CIM-STSK scheme provided by the invention can realize better bit error rate performance and higher transmission efficiency. Meanwhile, simulation of the CIM-STSK scheme is matched with a theoretical graph.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an index modulation method of a wireless communication system, in particular to a code index modulation (CIM)-based space-time shift keying (STSK) method. Background technique [0002] Recently, 6G wireless communication is expected to bring higher spectral efficiency and energy efficiency, for which various emerging technologies have been proposed. As one of the key technologies, index modulation uses the index of resources to transmit additional information bits, which can achieve higher spectral efficiency (SE) and energy efficiency (EE). This field has attracted great attention from researchers. Index modulation It is mainly divided into four types: air domain, frequency domain, time domain, and code domain. The corresponding activation resources are antennas, subcarriers, time slots, and spreading codes. Among them, the latest research in the code domain is Code Index ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04L1/06H04L27/32
CPCH04L1/0618H04L27/32H04B7/04Y02D30/70
Inventor 金小萍卞李娜
Owner 中国计量大学上虞高等研究院有限公司
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