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A Method for Obtaining Reciprocity of Underwater Acoustic Channels Using Compressed Sensing

A compressed sensing, underwater acoustic channel technology, applied in the transmitter/receiver shaping network, baseband system components, multi-frequency code system, etc. I/Q imbalance and other problems, to eliminate different influences, ensure reciprocity, and enhance robustness

Active Publication Date: 2016-08-17
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] (2) I / Q imbalance
[0008] (3) Channel estimation error
[0010] (4) Interference asymmetry
However, due to the complexity of the underwater acoustic environment, the degree of interference received by each transmitted signal is different, and the precoding of the signal at the sending end cannot eliminate the noise interference very well.

Method used

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  • A Method for Obtaining Reciprocity of Underwater Acoustic Channels Using Compressed Sensing
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  • A Method for Obtaining Reciprocity of Underwater Acoustic Channels Using Compressed Sensing

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Embodiment Construction

[0070] The following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.

[0071] see figure 1 with 2 , taking the uplink as an example, the specific implementation steps of the method for obtaining the reciprocity of the underwater acoustic channel in the embodiment of the present invention are as follows:

[0072] (1) Perform channel coding, QPSK modulation, and serial-to-parallel conversion on the source data to become effective data D to be transmitted in N-N_pilot-N_zeros subcarrier format, where N is the length of the OFDM transmission system frame, and N_pilot is the pilot frequency Length, N_zeros is the number of empty carriers;

[0073] (2) Generate sub-carrier pilot data, the length of which is determined by the frame structure of the OFDM transmission system, and the present invention uses a comb pilot. The pilot length is N_pilot=256, the number of empty carriers is N_zeros=96, and the length of one OFDM fram...

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Abstract

The invention discloses a method of obtaining underwater acoustic channel reciprocity by using compressed sensing and relates to underwater acoustic communication. The method is used for obtaining accurate channel parameters from OFDM (Orthogonal Frequency Division Multiplexing) received signals and ensuring the reciprocity of underwater acoustic channels. According to a compressed sensing theory, an OMP algorithm is used for reconstructing time domain impulse noise interference and wide single frequency noise interference, and eliminating the noise interference by observed quantity. For the time domain impulse noise interference, the time domain impulse noise interference is estimated by virtual subcarrier at a receiving end, is reconstructed by the OMP algorithm and is eliminated; the wide single frequency noise extracted at the receiving end has sparsity at a frequency domain, domain conversion is not needed, a measurement matrix is utilized, and the wide single frequency noise interference is reconstructed according to the OMP algorithm and is eliminated. The upper row and the lower row of underwater acoustic channels after the time domain impulse noise interference and the wide single frequency noise interference are eliminated are identical in channel states, namely, the underwater acoustic channels are provided with the reciprocity.

Description

technical field [0001] The invention relates to underwater acoustic communication, in particular to a method for obtaining underwater acoustic channel reciprocity by using compressed sensing. Background technique [0002] Acoustic waves are the only information carrier that can be used for long-distance transmission in underwater communication. With the continuous development of ocean development in recent years, the requirements for the transmission capacity of underwater communication and the improvement of communication capacity are getting higher and higher. However, the channel of underwater acoustic communication The performance of the communication system is greatly limited. Due to the complexity of the underwater acoustic channel, there are characteristics such as narrow bandwidth, strong multipath, high noise, and time-space-frequency variation at any time, which seriously limit the performance of the communication system. New methods of modulation, coding, and pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/02H04L25/03
Inventor 孙海信林娜蒯小燕程恩
Owner XIAMEN UNIV
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