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Method for generating transmitting signal in space-frequency two-dimensional index modulation system

A technology for index modulation and signal transmission, which is applied in the direction of modulated carrier system, multi-frequency code system, space transmission diversity, etc., and can solve the problem of large and small

Active Publication Date: 2020-05-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Claims
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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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  • Method for generating transmitting signal in space-frequency two-dimensional index modulation system
  • Method for generating transmitting signal in space-frequency two-dimensional index modulation system
  • Method for generating transmitting signal 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 interference resistance, and particularly relates to a method for generating a transmitting signal in a space-frequency two-dimensional index modulation system. For the situation that no transmit diversity gain exists in a space-frequency two-dimensional index modulation system, the invention provides a transmitted signal pattern generation method based on subcarrier binding. Specifically, a space-frequency domain resource unit is defined; namely, the space-frequency resource of each subcarrier on each antenna is used as a basic unit; grouping is carried out on a frequency domain, then subcarriers on each antenna are bound to form virtual space-frequency resource blocks, part of the space-frequency resource blocks are activatedduring each transmission, and the same amplitude modulation and phase modulation signal is mapped by the same virtual block, thereby obtaining a frequency domain signal, and further obtaining a transmission signal. According to the method, the transmit diversity gain of the system can be improved, and the overall transmit gain of the system can be flexibly configured.

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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IPC IPC(8): H04B7/0413H04B7/06H04L27/26
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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