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A spectrally efficient multi-carrier modulation method with multi-dimensional subcarrier index activation

A multi-carrier modulation and sub-carrier technology, applied in multi-carrier systems, modulated carrier systems, digital transmission systems, etc., to reduce the bit error rate and improve transmission efficiency.

Inactive Publication Date: 2020-09-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the face of the huge demand for information exchange in future communications, the spectral efficiency of GFDM-IM still cannot meet the demand, and it is necessary to further explore ways to improve spectral efficiency, reduce the bit error rate, and achieve higher-speed, high-quality information transmission

Method used

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  • A spectrally efficient multi-carrier modulation method with multi-dimensional subcarrier index activation
  • A spectrally efficient multi-carrier modulation method with multi-dimensional subcarrier index activation
  • A spectrally efficient multi-carrier modulation method with multi-dimensional subcarrier index activation

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Embodiment 1

[0027] The embodiment of the present invention provides a high spectral efficiency multi-carrier modulation method activated by multi-dimensional sub-carrier index, which is called GFDM-RIIM (GFDM-based real part imaginary part index modulation technology) in this application, and its basic idea is based on GFDM Based on GFDM-IM, the efficiency is higher than GFDM-IM, see figure 1 , the method includes the following steps:

[0028] 101: Divide the bit information to be transmitted into real part index bits, imaginary part index bits, and map to corresponding constellation points according to the constellation diagram;

[0029] 102: At the transmitter, ex-P 1 bits as real part index bits, in n q Select k from subcarriers q subcarriers for real part activation, and the subsequent P 2 bits as the imaginary part index bits, at n q Select k from subcarriers q subcarriers for imaginary part activation;

[0030] 103: Put the last remaining P 3 bits for constellation mapping a...

Embodiment 2

[0034] The scheme in embodiment 1 is further introduced below in combination with specific calculation formulas, see the following description for details:

[0035] 201: Divide the bit information to be transmitted into three parts, namely real part index bits, imaginary part index bits, and mapping to corresponding constellation points according to the constellation diagram;

[0036] Among them, the first part is used as the real part index bit for the selective activation of the real part of the subcarrier; the second part is used as the imaginary part index bit for the selective activation of the imaginary part of the subcarrier; the third part is mapped to the corresponding Constellation points (the terms involved here are technical terms well known to those skilled in the art), the real part and the imaginary part of the constellation point are respectively loaded on the subcarrier whose real part is activated and the subcarrier whose imaginary part is activated.

[0037]...

Embodiment 3

[0053] Combined with the specific experimental data, Figure 2-Figure 4 The scheme in embodiment 1 and 2 is carried out feasibility verification, see the following description for details:

[0054] 1. 4QAM experiment

[0055] figure 2 It is a comparison simulation diagram of the bit error rate of GFDM under 4QAM modulation, GFDM-IM and GFDM-RIIM (this method). In this test, n q = 4,k q = 3, the filter roll-off coefficients used are r=0.1, r=0.9, and the real and imaginary part index rules are shown in Table 1. The number of subcarriers used in GFDM and GFDM-IM is K=64, which can carry The number of bits P=768, the number of subcarriers K=52 used by GFDM-RIIM, and the number of bits that can be carried P=780.

[0056] It can be seen that the BER performance of GFDM is relatively good at low SNR, and the BER performance of GFDM-RIIM is significantly better than that of GFDM and GFDM-IM at high SNR. In the case of GFDM-RIIM, the number of subcarriers occupied by GFDM-RIIM ...

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Abstract

The invention discloses a multi-dimension subcarrier index activated high-spectral-efficiency multi-carrier modulation method, comprising the following steps of dividing bit information needing to betransmitted into real part index bits and imaginary part index bits, and mapping the real part index bits and the imaginary part index bits into corresponding constellation points according to a constellation diagram; at a transmitting end, taking former P<1> bits as the real part index bits, selecting k<q> subcarriers from n<q> subcarriers for real part activation, taking the latter P <2> bits asthe imaginary part index bits, and selecting the k<q> subcarriers from the n<q> subcarriers for imaginary part activation; carrying out constellation mapping on the rest P<3> bits and loading the P<3> bits on the real parts and the imaginary parts of the k<q> selected subcarriers; and at a receiving end, removing cyclic prefixes from received signals, monitoring activation states of demodulated signal real parts and imaginary parts, restoring the former P<1> bits and the latter P<2> bits, and restoring original information bits through constellation diagram inverse mapping based on the k<q> activated subcarriers.

Description

technical field [0001] The invention relates to the field of non-orthogonal digital multi-carrier transmission technology and real part imaginary part index modulation technology, in particular to a multi-dimensional sub-carrier index activation high spectrum efficiency multi-carrier modulation method. Background technique [0002] In the future wireless communication system, due to the large out-of-band power radiation of traditional OFDM (Orthogonal Frequency Division Multiplexing), a large frequency band guard interval is required, resulting in low frequency band utilization. Therefore, in the face of application requirements such as high-speed transmission in the 5G communication era, OFDM cannot meet the needs of transmitting more information under limited spectrum resources. Therefore, the new non-orthogonal multi-carrier transmission technology of GFDM (Generalized Frequency Division Multiplexing) It emerged as the times require and has become a research hotspot. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/36H04L27/38
CPCH04L27/362H04L27/364H04L27/3863
Inventor 付晓梅管丽颖苏毅珊
Owner TIANJIN UNIV
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