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Constellation diagram design method for index modulation OFDM (Orthogonal Frequency Division Multiplexing) system

An index modulation and design method technology, applied in the modulation carrier system, wavelet modulation carrier system, transmission system, etc., can solve the problems of OFDM not applicable to high-speed scenarios, orthogonal inter-carrier interference, peak-to-average ratio, etc., and achieve improvement Effects of BER performance, increasing Euclidean distance, and increasing transmission accuracy

Active Publication Date: 2017-11-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, in high-speed scenarios, the orthogonality between sub-channels will be damaged by Doppler frequency shift, causing inter-carrier interference, and the superposition of OFDM multiple sub-channel signals will also lead to a higher peak-to-average ratio. These shortcomings are OFDM Not suitable for high-speed scenes

Method used

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  • Constellation diagram design method for index modulation OFDM (Orthogonal Frequency Division Multiplexing) system
  • Constellation diagram design method for index modulation OFDM (Orthogonal Frequency Division Multiplexing) system
  • Constellation diagram design method for index modulation OFDM (Orthogonal Frequency Division Multiplexing) system

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example 1

[0036] In this example, the EVA channel model is used, the vehicle speed is 60km / h, the carrier spacing is 15kHz, the ideal channel estimation, the total number of system carriers is 1024, and the interleaving is divided into blocks. The 3 alternative combinations used to achieve 1.5bps / Hz are: The energy distribution vector is E=[1.75,1,0.25]. The corresponding constellation diagram is designed as figure 2 . On the detection side, this example uses the following steps:

[0037] Step 1: Divide 1024 sub-carriers into 256 sub-carrier blocks, each sub-carrier block consists of 4 sub-carriers, 2 sub-carriers are activated, and 2 are silent;

[0038] Step 2: For any sub-carrier block, calculate the minimum Euclidean distance under a certain candidate modulation combination;

[0039] Step 3: Traverse all the candidate modulation combinations, select the minimum Euclidean distance \ maximum value corresponding to each candidate modulation method combination, and its corresponding modul...

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Abstract

The invention belongs to the technical field of wireless communication, and relates to an index modulation orthogonal frequency division multiplexing (OFDM-IM) technology, a constellation diagram design technology and an adaptive technology, in particular to a constellation diagram design and adaptive modulation method for the index modulation OFDM system. The constellation diagram design method comprises the following steps: firstly, giving an alternative modulation combination, and designing a proper constellation diagram; and adaptively selecting a modulation way according to the designed constellation diagram, so that each subcarrier wave block selects an optical modulation way from the alternative modulation combination. Compared with a conventional ISIM-OFDM (Interleaved Subcarrier Index Modulation-Orthogonal Frequency Division Multiplexing) system, the constellation diagram design method has the advantages that an adaptive modulation technology is adopted at a transmitting end, so that the situation of relatively high bit error rate of a single modulation way under a poor channel condition is avoided. The constellation diagram is designed, so that the Euclidean distance between modulation symbols can be increased, and the transmission accuracy is increased.

Description

Technical field [0001] The present invention belongs to the field of wireless communication technology, and specifically is a constellation diagram design method for index modulation OFDM system, and proposes an adaptive modulation method according to the designed constellation diagram. The present invention relates to orthogonal frequency division multiplexing (OFDM-IM) technology based on index modulation, adaptive modulation technology, constellation design technology and the like. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) [8] The technology has become one of the core technologies of the 4G mobile communication system. The orthogonality between the sub-carriers makes the fading experienced by each sub-channel relatively flat, and the cyclic prefix is ​​introduced to reduce inter-symbol interference. It has the characteristics of high spectrum utilization, good resistance to multipath effects, and fast Fourier transform. It provides a simp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04L27/26
CPCH04L27/0004H04L27/0014H04L27/2627
Inventor 杨杰王鹏飞温培博刘晓波但黎琳肖悦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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