Multi-antenna OTFS modulation method and system based on spatial modulation

A technology of spatial modulation and OTFS, applied in the field of communication, can solve problems such as low spectral efficiency, and achieve the effect of improving spectral efficiency, improving robustness and reducing bit error rate

Active Publication Date: 2021-12-17
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the maximum spectral efficiency of the full-diversity STC-OTFS system can only transmit one symbol per time slot, and the spectral efficiency is low

Method used

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  • Multi-antenna OTFS modulation method and system based on spatial modulation
  • Multi-antenna OTFS modulation method and system based on spatial modulation
  • Multi-antenna OTFS modulation method and system based on spatial modulation

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Embodiment 1

[0059] See figure 1 , figure 1 It is a flowchart of a multi-antenna OTFS modulation method based on spatial modulation provided by an embodiment of the present invention. The multi-antenna OTFS modulation method includes:

[0060] S1: Perform spatial modulation on the original information sequence to be transmitted to obtain a modulated symbol sequence and a transmit antenna index sequence.

[0061] Specifically, step S1 includes:

[0062] S11: Convert the original information sequence to be transmitted into a binary bit sequence, and group the binary bit sequence into groups of m bits, and separate each group into m-length s The signal bit vector and length m l The spatial bit vector of , where m is the spectral efficiency of the modulation system, m l = log 2 N t , N t is the total number of transmit antennas, m s =m-m l ;

[0063] S12: For each group, the length is m s Perform constellation mapping on the signal bit vector to obtain symbols after constellation m...

Embodiment 2

[0079] On the basis of the foregoing embodiments, this embodiment provides another spatial modulation-based multi-antenna OTFS modulation method. See figure 2 , the multi-antenna OTFS modulation method of this embodiment includes:

[0080] (1) Assign the required number of space bits to the transmitting antenna space: set the total number of transmitting antennas N t is the power of 2, for the total number of transmitting antennas N t Perform logarithmic operation to obtain the number of space bits as m l = log 2 N t ; Assuming that the activation probability of each transmitting antenna is equal, a spatial bit vector and an antenna index form a one-to-one mapping.

[0081] In this embodiment, set the total number of transmitting antennas N t is 2, then the number of space bits is m l = log 2 N t =1. That is, space bit 0 corresponds to antenna index 1, and space bit 1 corresponds to antenna index 2.

[0082] (2) Assign the number of signal bits required for signal ...

Embodiment 3

[0097] On the basis of the above embodiments, this embodiment provides a multi-antenna OTFS modulation system based on spatial modulation. See Figure 4 , Figure 4 It is a block diagram of a multi-antenna OTFS modulation system based on spatial modulation provided by an embodiment of the present invention. The signal modulation system includes:

[0098] The spatial modulation module 1 is used to spatially modulate the information sequence to be transmitted, and obtain the modulated symbol sequence and the transmitting antenna index sequence;

[0099] The OTFS modulation module 2 is used to arrange the symbol sequence of each transmitting antenna into a delay-Doppler domain signal matrix, obtain OTFS symbol blocks and modulate into a time domain signal matrix;

[0100] A time-domain channel module 3, configured to perform time-domain channel transmission on the time-domain signal matrix according to the transmit antenna index sequence;

[0101] The OTFS demodulation module...

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Abstract

The invention discloses a multi-antenna OTFS modulation method and system based on spatial modulation, and the method comprises the steps: carrying out the spatial modulation of an original information sequence needing to be transmitted, and obtaining a modulated symbol sequence and a transmitting antenna index sequence; arranging the symbol sequence of each transmitting antenna into a time delay-Doppler domain signal matrix to obtain an OTFS symbol block, and converting the OTFS symbol block into a time domain signal matrix; performing time domain channel transmission on the time domain signal matrix according to the transmitting antenna index sequence; performing OTFS demodulation on the time domain signal matrix at a receiving end, and recovering the time domain signal matrix to be a symbol matrix on a time delay-Doppler domain; and performing maximum likelihood detection on the symbol matrix recovered on each time slot in combination with the antenna index sequence and the modulated symbol sequence, and recovering the original information sequence. According to the method, only one transmitting antenna is activated to transmit the data information in each time slot, so that the problems of mutual interference and synchronization between the antennas can be effectively avoided, and the complexity of a multi-antenna system receiver can be reduced.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a multi-antenna OTFS modulation method and system based on space modulation. Background technique [0002] For next-generation wireless systems, such as post-5G and 6G, how to obtain data transmission with high reliability and high throughput has become a hot issue in the design of multi-carrier signal transmission schemes. These schemes are expected to be efficiently transmitted in dual-dispersion channels in high-speed mobile scenarios such as high-speed rail communication and vehicle-to-vehicle communication. Orthogonal Time Frequency Space (OTFS) modulation technology is a multi-carrier transmission scheme proposed for this high Doppler channel. Compared with the current Orthogonal Frequency Division Multiplexing (OFDM) scheme adopted by 4G and 5G for signal transmission in the time-frequency domain, OTFS uses the delay-Doppler domain for signal transmissio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B7/06
CPCH04L27/2627H04L27/2655H04L27/2691H04B7/068Y02D30/70
Inventor 张春琼冯丹刘孟孟白宝明
Owner XIDIAN UNIV
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