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ARQ feedback based resource allocation scheme for relay cooperative underwater acoustic communication system

A relay node, multi-user system technology, applied in signaling allocation, transmission path sub-channel allocation, transmission modification based on link quality, etc., can solve problems such as inter-user interference, interference conflict, signal fading, etc.

Active Publication Date: 2017-01-25
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for wireless network environments, including underwater acoustic communication, there are interference conflicts, inter-user interference, signal fading, and environmental impacts that are much more serious than wired networks. If you continue to use layered design, then there will be the following two problems : The performance of the entire network cannot be guaranteed to be optimized; there is no flexibility to adapt to environmental changes

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  • ARQ feedback based resource allocation scheme for relay cooperative underwater acoustic communication system
  • ARQ feedback based resource allocation scheme for relay cooperative underwater acoustic communication system
  • ARQ feedback based resource allocation scheme for relay cooperative underwater acoustic communication system

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Embodiment Construction

[0106] It will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0107] combine figure 1 The underwater acoustic relay system shown, the system includes a source node S, a relay node R, and K user sensor nodes, where the source node S and the target user node are set to be blocked by obstacles, that is, regardless of direct path. In terms of channel modeling, a block fading channel is used, a time slot is set as T seconds, all subcarriers are evenly divided into D parts (defined as frequency blocks), and this is regarded as an independent unit that can be used, that is, each frequency Fast is not related to other frequency blocks, and can be processed separately, that is, N subcarriers are divided into D frequency blocks, that is, there are N / D subcarriers on each frequency block, the symbol time slot is T, and the data packet time slot is set to is T / M, M is the number of packages, K, D, N, M, and T are all positive integer...

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Abstract

The invention discloses an ARQ feedback based resource allocation method for a relay cooperative underwater acoustic communication system. Under the circumstance that the target packet error rate and the status information of an unknown channel at the end of a source node are given, feedback information ACK and NAK (acknowledge / negative acknowledge) of a target terminal are utilized and the situations of relatively complicated underwater environment, relatively severe noise interference and anterior noise amplification by a relay are drawn into consideration to realize dispatching and rate allocation of target users. Simulation results show that compared with a traditional scheme, the scheme provided by the invention can be utilized to obtain relatively low bit error rate (approximate to the performance when the channel status is known) under the condition of relatively low complexity.

Description

technical field [0001] The present invention relates to the technical field of resource allocation of underwater acoustic communication systems, especially when the underwater acoustic environment is disturbed by underwater noise and relay added noise, etc., the downlink underwater acoustic communication resource allocation scheme combined with AF relay technology can be used in In the case of incomplete knowledge of the channel information, the upper and lower bounds are recursively updated using the ACK / NAK feedback of the target node, which can gradually approach the actual SIR and rate under the given packet error rate, and obtain an underwater acoustic A scheme for system user scheduling and rate allocation. Background technique [0002] As we all know, there are a lot of resources and vast space in the ocean, so the underwater acoustic communication service emerges as the times require. It was first used in military systems, and now it is widely used in civilian indus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04L1/00H04B13/02
CPCH04B13/02H04L1/0002H04L5/0055
Inventor 李春国宋康董赛曹冰昊徐煜耀杨绿溪
Owner SOUTHEAST UNIV
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