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A method for asynchronous multi-user access of underwater acoustic OFDM

A multi-user access and orthogonal frequency division technology, applied in the field of underwater acoustic orthogonal frequency division multiplexing asynchronous multi-user access, can solve problems such as OFDM inter-symbol interference, achieve good processing delay and decoding performance, and take into account processing Effects of Latency and Decoding Performance

Active Publication Date: 2019-06-14
HARBIN ENG UNIV
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Problems solved by technology

However, the present invention proposes an asynchronous multi-user access system based on sliding iteration for the serious OFDM intersymbol interference problem caused by the asynchronous multi-user access of the underwater acoustic OFDM system.

Method used

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  • A method for asynchronous multi-user access of underwater acoustic OFDM
  • A method for asynchronous multi-user access of underwater acoustic OFDM
  • A method for asynchronous multi-user access of underwater acoustic OFDM

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] The system that the present invention solves its technical problem adopts comprises following two parts:

[0019] 1. OFDM asynchronous multi-user receiver demodulation algorithm, including five processing modules: overlap truncation, interference cancellation, frequency domain oversampling, multi-user channel estimation and decoding, and interference reconstruction:

[0020] (1) Overlap truncation. First, the received time-domain waveform is truncated into independent processing units for decoding. Each truncated unit includes three parts: forward interference, desired signal and backward interference.

[0021] (2) Interference elimination. Use the interference estimate obtained in the last iteration to perform interference cancellation on the current truncation unit.

[0022] (3) Frequency domain oversampling. Frequency-domain oversampling is performed on t...

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Abstract

The present invention belongs to the field of underwater acoustic communications, and particularly relates to an asynchronous multi-user access method for underwater acoustic OFDM (Orthogonal Frequency Division Multiplexing). The method comprises the following steps: overlap truncation; interference cancellation; frequency domain oversampling; multi-user channel estimation and decoding; and interference reconstruction. According to the present invention, an asynchronous interference model is established by using an overlap truncation method based on a sliding iteration structure, and then a received signal after interference cancellation is equivalent to a quasi-synchronous MIMO (multiple-input multiple-output) system to realize the multi-user data decoding, so that the asynchronous multi-user access method can be better to take the processing delay and the decoding performance into account, and has practical application value.

Description

technical field [0001] The invention belongs to the field of underwater acoustic communication, and in particular relates to an underwater acoustic orthogonal frequency division multiplexing asynchronous multi-user access method. Background technique [0002] With the deepening of ocean development, the physical layer communication technology applied to underwater acoustic sensor network is receiving more and more attention. The underwater acoustic sensor network hopes to improve bandwidth utilization and increase network throughput in limited spectrum resources. Space-division multiple access (SDMA) technology allows multiple users to share the same spectrum resource in the same time slot, which is one of the methods to effectively improve system capacity. A multi-user orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) system is a typical space division multiple access system, and all users share the same time slot and subcarrier....

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
CPCH04L27/2691
Inventor 乔钢马璐刘凇佐李雪宋庆军周锋孙宗鑫聂东虎尹艳玲
Owner HARBIN ENG UNIV
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