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An index modulation frequency hopping communication method based on ifft/fft framework

A technology of index modulation and frequency hopping communication, applied in transmission systems, electrical components, etc., can solve problems such as low spectral efficiency, and achieve the effect of increasing spectral efficiency, realizing frequency hopping, and improving transmission efficiency

Active Publication Date: 2020-09-11
HARBIN ENG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of index modulation frequency hopping communication technology based on IFFT / FFT frame that solves the problem of low spectral efficiency of existing FI communication technology

Method used

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  • An index modulation frequency hopping communication method based on ifft/fft framework
  • An index modulation frequency hopping communication method based on ifft/fft framework
  • An index modulation frequency hopping communication method based on ifft/fft framework

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Embodiment Construction

[0034] Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:

[0035] Such as figure 2 As shown in the frame diagram of the SFI communication system, the transmitter mainly includes the following steps:

[0036] Step 1: Determine system parameters, including the total number N of subcarriers, the number k of activated subcarriers, and the order M of modulation. Divided into frames by digitized information sources, each frame has m=m 1 +m 2 bit information bits, according to the formula and m 2 = k log 2 M calculates the number of index bits and the number of modulation bits.

[0037] Step 2: Index modulation. Such as image 3 The schematic diagram of the index modulation is shown, and the M-order modulation is performed on the signal modulation bits, and mapped into k constellation point symbols s i =[s i,1 ,s i,2 ,...,s i,k ], the index bits determine a subcarrier activation combination Ω l ={β i...

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Abstract

The invention discloses an index modulation frequency hopping communication technology based on an IFFT / FFT framework and belongs to the technical field of wireless communication. By introducing the index modulation technology into the frequency hopping communication technology based on IFFT / FFT, index selection is carried out on parts of sub-carriers to carry out activation to transmit modulationsignals from all sub-carriers of an IFFT / FFT module in an information driving way and other sub-carriers are kept in a silent state. Index modulation is introduced into an emission end of a system, and information bits are divided into two parts. One part is used as signal modulation bit and is mapped to be a constellation point symbol of M system. One part is used as index information bit. Partsof sub-carriers are selected to be excited to transmit the constellation symbol in the all sub-carriers, so frequency hopping is achieved in a way of information driving, so frequency spectrum frequency is obviously increased and system transmission efficiency is improved. According to the invention, frequency hopping is achieved in a way of information driving, so compared with the FI, the provided SFI has quite high frequency spectrum frequency and better system performance.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an index modulation frequency hopping communication technology based on an IFFT / FFT frame. Background technique [0002] After decades of continuous development and improvement of frequency hopping communication technology, frequency hopping communication equipment in various countries has been improved and upgraded by leaps and bounds. Since the 1980s, most countries have carried out research and application on frequency hopping communication technology, and have been accelerating the update of frequency hopping communication equipment. [0003] In the mid-1980s, the Scimitar-H frequency-hopping radio and the Jaguar-H frequency-hopping radio developed by the United Kingdom had a jump speed of tens of hops per second, but they already had preliminary anti-jamming capabilities; from the late 1980s to the early 1990s , the TRC-350H frequency hopping radi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7136
CPCH04B1/7136H04B2001/71367
Inventor 宁晓燕刘友帅严盼孙志国
Owner HARBIN ENG UNIV
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