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OFDM-MFSK underwater acoustic communication broadband Doppler estimation and compensation method based on sub-carrier energy

An OFDM-MFSK and Doppler estimation technology, applied in the field of underwater communication, can solve problems such as poor stability and low estimation accuracy, and achieve the effects of improving real-time performance, ensuring estimation accuracy, and avoiding loss of signal-to-noise ratio.

Active Publication Date: 2017-10-03
HARBIN ENG UNIV
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Problems solved by technology

[0004] The object of the present invention is to provide a method for estimating and compensating wideband Doppler in OFDM-MFSK underwater acoustic communication based on subcarrier energy, which effectively realizes accurate estimation and compensation of wideband Doppler in underwater OFDM-MFSK communication system , which solves the problems of poor stability and low estimation accuracy of the traditional Doppler estimation method in the application of fast-changing multi-channel underwater acoustic channels

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  • OFDM-MFSK underwater acoustic communication broadband Doppler estimation and compensation method based on sub-carrier energy
  • OFDM-MFSK underwater acoustic communication broadband Doppler estimation and compensation method based on sub-carrier energy
  • OFDM-MFSK underwater acoustic communication broadband Doppler estimation and compensation method based on sub-carrier energy

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[0016] The present invention will be described in more detail below in conjunction with the accompanying drawings.

[0017] 1. First, add a broadband pulse pair signal to a frame of transmitted data. The specific transmission frame structure used is as follows: figure 1 shown. Using a linear frequency modulation signal as a synchronization signal, the adopted wideband pulse pair is composed of a linear frequency modulation signal (LFM), and finally data composed of multiple OFDM-MFSK data blocks. A guard interval is added between the pulse pair and the synchronization signal and data, and the length of the guard interval is greater than the channel multi-channel extension length. Each OFDM-MFSK data block is a signal after adding a cyclic prefix or zeroing data to a single time-domain OFDM-MFSK symbol, figure 2 Given are two implementations of a single OFDM-MFSK data block.

[0018] 2. The signal processing process at the receiving end is as follows: image 3 shown. Firs...

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Abstract

The invention discloses an OFDM-MFSK underwater acoustic communication broadband Doppler estimation and compensation method based on sub-carrier energy, and belongs to the field of the underwater communication. The specific content is as follows: a transmitting end inserts a pulse pair signal between a synchronization signal and the data; a receiving end firstly detects the synchronization signal to complete the Doppler initial compensation; the demodulation is performed on each OFDM-MFSK data block in the data in a way of one data block by one data block to estimate the effective sub-carrier position, and the energy sum of all effective sub-carrier is used as the cost function to perform the search according to the given different Doppler factors, thereby acquiring the fine Doppler factor of the current data block to complete the fine compensation of the Doppler; and finally the receiving data is demodulated. By using the method disclosed by the invention, the accurate estimation and compensation of the broadband Doppler in the underwater OFDM-MFSK communication system is effectively realized, and the problem that the traditional Doppler estimation method is bad in stability and low in estimation precision is solved.

Description

technical field [0001] The invention relates to an OFDM-MFSK underwater acoustic communication broadband Doppler estimation and compensation method based on subcarrier energy, belonging to the field of underwater communication. Background technique [0002] In underwater acoustic communication, the relative motion between the source and the sink will cause serious Doppler effect on the underwater acoustic communication system. In the multi-carrier underwater acoustic communication system, the serious Doppler effect directly makes the system suffer from inter-subcarrier interference and the reduction of the sub-carrier SNR, resulting in an increase in the bit error rate. The ultra-wideband characteristics of the underwater acoustic channel make the frequency offsets of different subcarriers of the multi-carrier system inconsistent, that is, the wideband Doppler effect, so the Doppler factor should be studied as the main parameter. [0003] Usually, the underwater acoustic co...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/01H04B11/00H04B13/02H04L27/26H04L27/10
CPCH04B7/01H04B11/00H04B13/02H04L27/10H04L27/2655H04L27/2697Y02D30/70
Inventor 孙大军郑翠娥崔宏宇张居成韩云峰王永恒
Owner HARBIN ENG UNIV
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