Channel estimation method for sub-carrier index modulation OFDM system

A technology of carrier index modulation and channel estimation, which is applied in the direction of modulated carrier system, channel estimation, baseband system, etc. It can solve the problems of system impact and achieve the effect of improving performance and reducing impact

Active Publication Date: 2017-05-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] The present invention aims at the problem that the judgment error of the pilot frequency position of the existing index modulation OFDM system affects the system, and proposes an algorithm for selectively eliminating wrong pilot frequency points

Method used

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  • Channel estimation method for sub-carrier index modulation OFDM system
  • Channel estimation method for sub-carrier index modulation OFDM system

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Embodiment

[0026] In the following, (n,k)=(2,1), the total number of subcarriers N=1024, the cyclic prefix CP=64, the modulation symbol adopts QPSK (4-QAM), the rough channel estimation adopts LS channel estimation, and the channel fine Estimation adopts CS channel estimation, ZF equalization is used as an example to introduce the specific implementation of the present invention.

[0027] sender:

[0028] Such as figure 1 The schematic diagram of the SIM modulation shown, the specific implementation process is roughly divided into the following steps:

[0029] Step 1-1: Determine the parameters of the system to be selected, that is, determine the number of sub-carriers N=1024, the number of sub-carriers in each sub-block n=2, how many sub-carriers are activated in the sub-block k=1, divided into The number of sub-blocks g=N / n=512, and the modulation order M=4. Then calculate the number of bits in a frame according to the formula. For any one of the sub-blocks, the index bit length is...

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Abstract

The invention belongs to the technical field of wireless communications, and in particular relates to a channel estimation method for a sub-carrier index modulation OFDM system. The method comprises the following steps: on the basis of the existing index modulation OFDM system, the power distribution is performed on the data mapping sub-carrier and the pilot frequency mapping sub-carrier at a sending end, a receiving end acquires a position corresponding to the pilot frequency through energy detection, and selectively removes the misjudged pilot frequency position. The method disclosed by the invention is used for the index modulation OFDM communication system based on the pilot frequency, the influence of the error pilot frequency position to the system is reduced by removing a plurality of misjudged pilot frequency positions, and the system channel estimation performance is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a channel estimation method for a subcarrier index modulation OFDM system. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) technology is a high-speed transmission technology for wireless communication. Its basic principle is to decompose the high-speed data stream into many low-rate sub-data streams, that is, divide the signal into many orthogonal sub-carriers, and use these mutual Orthogonal subcarriers are transmitted simultaneously. This technology uses subcarriers to modulate data, expands the pulse width of symbols, can effectively resist inter-symbol interference (Inter-Symbol Interference, ISI), and improves the performance against multipath fading. Compared with traditional frequency division multiplexing (Frequency Division Multiplexing, FDM), OFDM does not require a dedicated guard band. Although there will be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
CPCH04L25/0224H04L25/024H04L27/2637
Inventor 但黎琳杨杰彭雨辰王鹏飞苑杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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