The Method of Transmitting Signal Generation in Space-Frequency Two-Dimensional Index Modulation System

A technology of index modulation and signal transmission, applied in modulation carrier system, multi-frequency code system, space transmit diversity and other directions, can solve the problem of only first-class

Active Publication Date: 2021-09-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The space-frequency two-dimensional index modulation system formed by the combination of IM technology, MIMO and OFDM technology extends the index object from a single antenna or subcarrier to a two-dimensional collection of space and frequency domains, and can jointly consider two dimensions of resource optimization transmission signals, but existing systems such as MIMO-OFDM-IM, G-JSFIM and KP-JSFIM systems only consider grouping all subcarrier resources and activating some subcarriers for transmitting AM / PM signals, because each subcarrier The symbols transmitted on the carrier are independent of each other, resulting in the maximum transmit diversity order of the whole system being only one

Method used

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  • The Method of Transmitting Signal Generation in Space-Frequency Two-Dimensional Index Modulation System
  • The Method of Transmitting Signal Generation in Space-Frequency Two-Dimensional Index Modulation System
  • The Method of Transmitting Signal Generation in Space-Frequency Two-Dimensional Index Modulation System

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Embodiment

[0035] In this example, the number of transmitting antennas N t =2, the number of sub-carriers N=128, divided into G=32 groups, wherein every d=2 sub-carriers are bound together to form a virtual block, using BPSK modulation, for the first group, the formed virtual block is as follows image 3 shown.

[0036] It is set to activate two virtual blocks K each time v = 2, then m 2 =K v *M=2 establishes the mapping relationship as shown in Table 1 below:

[0037] Table 1 Index and virtual block mapping relationship

[0038]

[0039] Then the first group can carry m=m 1 +m 2 = 4, let the input bits of the first group be [0,1,0,1], then the corresponding frequency domain transmission signal of the first group is as follows image 3 shown.

[0040] Similarly, the bit mapping of the remaining 31 groups can be implemented in parallel to obtain a frequency-domain transmit signal matrix with a dimension of 128*2.

[0041] In order to demonstrate the effectiveness and practicab...

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Abstract

The invention belongs to the technical field of communication anti-jamming, and in particular relates to a method for generating a transmission signal in a space-frequency two-dimensional index modulation system. Aiming at the situation that the space-frequency two-dimensional index modulation system has no transmit diversity gain, the present invention proposes a method for generating a transmit signal pattern based on subcarrier bundling, specifically defining a resource unit in the space-frequency domain, that is, each subcarrier on each antenna As the basic unit, space-frequency resources are grouped in the frequency domain, and then the subcarriers on each antenna are bundled to form a virtual space-frequency resource block. Part of the space-frequency resource blocks are activated at each transmission, and the same virtual block is mapped The same amplitude modulation and phase modulation signal is used to obtain the frequency domain signal, and then the transmitted signal is obtained. The method can improve the transmit diversity gain of the system, and can flexibly configure the overall transmit gain of the system.

Description

technical field [0001] The invention belongs to the technical field of communication anti-jamming, in particular to a method for generating a transmission signal in a space-frequency two-dimensional index modulation system, more specifically to MIMO (Multiple Input Multiple Output) technology, IM (Index Modulation) technology, OFDM (Orthogonal Frequency-Division Multiplexing) technology. Background technique [0002] OFDM technology uses orthogonal subcarriers to transmit signals, which can effectively resist inter-symbol interference caused by wireless channel multipath, so it is a technology that can support high-speed data transmission under frequency selective channel conditions. [0003] MIMO technology is a high-speed transmission technology in a wireless environment. It configures multi-antenna units at the transmitter and receiver, and combines advanced space-time coding and modulation schemes. By making full use of the space degree of freedom, it can bring additiona...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04B7/0413H04B7/06H04L27/2627H04L27/2697
Inventor 曹瑞雷霞陶涛肖悦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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