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MIMO underwater acoustic channel estimation method based on improved adaptive hybrid optimization smoothing L0 norm

An underwater acoustic channel and self-adaptive technology, applied in the field of signal communication, can solve problems such as insufficient anti-noise performance, achieve good channel estimation performance, improve noise robustness, and improve channel estimation performance.

Active Publication Date: 2019-03-12
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

The above method is applied in the actual underwater acoustic channel, and the anti-noise performance is insufficient

Method used

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  • MIMO underwater acoustic channel estimation method based on improved adaptive hybrid optimization smoothing L0 norm
  • MIMO underwater acoustic channel estimation method based on improved adaptive hybrid optimization smoothing L0 norm
  • MIMO underwater acoustic channel estimation method based on improved adaptive hybrid optimization smoothing L0 norm

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[0044] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] Image 6 A flow chart for optimizing smooth L0 norm MIMO underwater acoustic channel estimation based on an improved adaptive hybrid. The method is as follows:

[0046] 1): Such as figure 1 As shown, create an N t A MIMO system with two transmitters and Nr receivers forms a N t ×Nr sub-channel model, each sub-channel corresponds to an underwater acoustic channel model, the channel frequency domain response D of the sub-channel can be obtained mn (t,τ) is

[0047]

[0048] Among them, p is the number of paths of each sub-channel, m, n represent the m-th transmitter and n-th receiver respectively, D mn (t,τ) represents the frequency domain response of the m-th transmitting terminal and the n-th receiving terminal at time t, τ i,mn Represents...

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Abstract

The invention discloses an MIMO underwater acoustic channel estimation method based on an improved adaptive hybrid optimization smoothing L0 norm. An improved algorithm (MAReSL0) of an objective function with a better approaching L0 norm is adopted to adaptively generate a reliable regularization factor, and an equilibrium iteration process is based on the sparseness of a solution in the objectivefunction and the error of residual; and in order to ensure the accurate convergence of the iteration to an optimal point, an initial value of the Nesterov gradient acceleration method (NAG) subjectedto inner loop iteration is used as the initial value of the newton method to perform hybrid optimized channel estimation. Numerical simulation indicated that the method is has better robustness thanother classical algorithms and effectively improves the channel estimation performance.

Description

Technical field [0001] The present invention relates to the technical field of signal communication, in particular to a MIMO underwater acoustic channel estimation method based on improved adaptive hybrid optimization and smoothing L0 norm. Background technique [0002] With the development of marine research and the need for national defense construction, people's demand for underwater communications is also increasing. The complexity of the marine environment has led to the characteristics of time-varying, multipath effects, and limited bandwidth of the underwater acoustic channel, making underwater acoustic communication a great challenge. In order to improve the quality of underwater acoustic communication, MIMO (multiple-input multiple-output) technology is adopted to increase the channel capacity and reduce the power consumption of the receiving end without additional frequency bandwidth. [0003] In order to realize the reconstruction of sparse signals, H. Mohimani, M. Baba...

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Application Information

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IPC IPC(8): H04B7/0413H04L25/02
CPCH04B7/0413H04L25/0204
Inventor 张秀再赵慧
Owner NANJING UNIV OF INFORMATION SCI & TECH
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