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Working method of orthogonal time-frequency spatial modulation system based on orthogonal spatial modulation

An orthogonal space and space modulation technology, applied in multi-carrier systems, advanced technology, climate sustainability, etc., can solve the problems of large detection complexity and limited space diversity gain, and achieve the average bit error rate performance improvement, guarantee Transmission reliability, the effect of improving effectiveness

Pending Publication Date: 2022-07-12
SHANDONG UNIV
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Problems solved by technology

The above scheme only activates one antenna when sending a signal, and the space diversity gain obtained is very limited, and the maximum likelihood (ML) detection adopted by the receiving end has a relatively large complexity

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  • Working method of orthogonal time-frequency spatial modulation system based on orthogonal spatial modulation
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  • Working method of orthogonal time-frequency spatial modulation system based on orthogonal spatial modulation

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Embodiment

[0023] A working method based on quadrature spatial modulation and quadrature time-frequency spatial modulation system, such as figure 1 As shown, the system mainly includes a transmitter and a receiver, wherein the transmitter includes an orthogonal space modulation module and an orthogonal time-frequency space modulation module; the receiver includes an orthogonal time-frequency space demodulation module, a signal detection and demapping module; Transmitter ConfigurationN t root transmit antenna, N t ≥2, receiver configuration N r Root receiving antenna, satisfying N r ≥N t , the communication process is as follows: First, the transmitter generates an information bit sequence in the delay-Doppler domain, and divides the bit sequence into MN groups by serial-to-parallel conversion, where M is the number of orthogonal time-frequency space subcarriers, and N is each The number of transmitted symbols in a group, each group is subjected to orthogonal spatial modulation, and e...

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Abstract

A working method based on an orthogonal spatial modulation and OTFS modulation system belongs to the wireless communication transmission technology, the system is composed of a transmitter and a receiver, and the communication process is as follows: firstly, transmitter information bits of a time delay-Doppler domain are subjected to serial-parallel conversion and then are divided into three parts to enter an orthogonal spatial modulation module, one part is used for constellation mapping to obtain a modulation symbol x, and the other part is used for receiving the modulation symbol x; the other two parts are respectively used for determining activation antenna indexes lR and lI for sending a real part and an imaginary part of the x; secondly, the obtained time delay-Doppler domain transmission signal is converted into a time domain transmission signal through OTFS modulation, and the time domain transmission signal reaches a receiver through a time-varying channel; and finally, the receiver carries out OTFS demodulation to obtain a time delay-Doppler domain receiving signal, the signal is detected by an EMMSE detector, and sending information bits are recovered through orthogonal space de-mapping and parallel-serial conversion. According to the system, the characteristics of orthogonal spatial modulation and OTFS modulation are integrated, a detection algorithm with high accuracy and low complexity is provided, and the overall system performance is improved.

Description

technical field [0001] The invention introduces a working method of an orthogonal time-frequency space modulation system based on orthogonal space modulation, and relates to the technical field of wireless communication transmission. Background technique [0002] Orthogonal Time-Frequency Space (OTFS) modulation is a new modulation technology designed in the delay-Doppler domain. In high-speed mobile scenarios, the orthogonality of the sub-carriers of the traditional Orthogonal Frequency Division Multiplexing (OFDM) technology will be reduced. The Doppler effect is destroyed, resulting in a false floor of its bit error rate performance under high signal-to-noise ratio conditions, while the OTFS modulation technique converts the fast-changing channel in the time-frequency domain into a delay-Doppler This feature makes the OTFS modulation technology a potential communication transmission technology to ensure the communication reliability of the terminal in high-speed mobile sc...

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Application Information

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IPC IPC(8): H04L27/34H04L27/36H04L27/38
CPCH04L27/3405H04L27/36H04L27/38Y02D30/70
Inventor 白智全蔡月影杨颖超杨凯越张金梅
Owner SHANDONG UNIV
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