Doppler Extended Estimation Method for Underwater Acoustic Communication System Based on Zero Correlation Band Sequence

A technology of Doppler extension and underwater acoustic communication, which is applied in the field of Doppler extension estimation of underwater acoustic communication system based on zero-correlation band sequence, can solve the problem of low estimation accuracy, achieve strong channel adaptability, high stability, Effects that facilitate signal processing

Active Publication Date: 2019-08-13
SOUTHEAST UNIV
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Problems solved by technology

[0006] Technical problem: In order to overcome the problem of low estimation accuracy of existing Doppler estimation schemes in underwater acoustic communication systems, the present invention provides a Doppler extension estimation method for underwater acoustic communication systems based on zero-correlation band sequences, making full use of ZCZ The sequence has good autocorrelation characteristics, real-time signal processing at the receiving end, and greatly improves the estimation accuracy of Doppler expansion factor

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  • Doppler Extended Estimation Method for Underwater Acoustic Communication System Based on Zero Correlation Band Sequence
  • Doppler Extended Estimation Method for Underwater Acoustic Communication System Based on Zero Correlation Band Sequence
  • Doppler Extended Estimation Method for Underwater Acoustic Communication System Based on Zero Correlation Band Sequence

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with the accompanying drawings.

[0044]Let the number of transmitting antennas of the MIMO-OFDM system be N t , the number of receiving antennas is N r , the signal adopts OFDM modulation based on cyclic prefix (CP, cyclic prefix) to prevent intersymbol interference, let B be the channel bandwidth, K be the number of subcarriers, then the subcarrier spacing is Δf=B / K, one OFDM symbol The duration is T=1 / Δf=K / B, and the cyclic prefix time length of each OFDM symbol is T g .

[0045] Such as figure 1 , 2 , as shown in 3, the training sequence used in the present invention is a ZCZ sequence generated by an interleaving factorization method. Let the set of ZCZ sequences be expressed as Then the periodic correlation function of Ψ(L,M,Z) satisfies:

[0046]

[0047] Among them, the superscript P represents the period, L is the length of the ZCZ sequence, M is the number of ZCZ sequences, Z is the...

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Abstract

The invention discloses a method for estimating a Doppler spread factor of a MIMO-OFDM underwater acoustic communication system by using a zero correlation zone (ZCZ) sequence as a training sequence. The method comprises the following steps: inserting two segments of repeated ZCZ sequences in front of a data frame, carrying out delayed autocorrelation operation on received signals by a receiving end by adopting a plurality of parallel correlators, and estimating the Doppler spread factor according to the window length of the correlator having the maximum output result. Compared with the existing Doppler spread estimation algorithm, the method can significantly improve the Doppler spread estimation accuracy and has strong channel adaptability, when the signal to noise ratio is greater than -5dB, the estimation accuracy is always kept to be 10<-4> or below, and the requirements of underwater acoustic communication with a high data rate for the estimation accuracy of the Doppler spread factor are satisfied.

Description

technical field [0001] The invention relates to the field of underwater acoustic communication, in particular to a method for estimating Doppler extension of an underwater acoustic communication system based on a zero-correlation band sequence. Background technique [0002] Bandwidth and spectrum utilization are two key factors affecting the information transmission rate of a communication system. MIMO technology can significantly improve spectrum utilization by transmitting and receiving signals through multiple antennas simultaneously. At the same time, OFDM technology divides frequency selective fading channels into multiple Orthogonal sub-channels, each sub-channel frequency flat fading to avoid inter-symbol interference. Therefore, MIMO-OFDM technology has a good application prospect for underwater acoustic communication systems with severe multipath interference. [0003] Physically, the underwater acoustic channel can be regarded as the sum of many propagation paths ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/69H04B13/02
CPCH04B1/69H04B13/02
Inventor 李春国宋康张行曹冰昊杨绿溪
Owner SOUTHEAST UNIV
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