一种低复杂度的水声OFDM通信系统子载波分配算法  

Low-complexity Subcarrier Allocation Algorithm for Underwater OFDM Acoustic Communication Systems

作　　者：尤凌 管张均 YOU Ling;GUAN Zhang-jun(Department of Computer Science,Shanghai Maritime University,Shanghai 201306,China;Department of Electronic Engineering,Shanghai Maritime University,Shanghai 201306,China)

机构地区：[1]上海海事大学计算机科学系,上海201306 [2]上海海事大学电子工程系,上海201306

出　　处：《计算机科学》2021年第S01期387-391,共5页Computer Science

基　　金：国家自然科学基金青年科学基金项目(61601283)。

摘　　要：近年来,随着国家"智慧海洋"战略的推进,以及海洋资源开发的需求,基于OFDM调制的水声通信技术得到了飞速发展,其关键问题之一就是主节点如何分配子载波资源以优化系统性能。据此,提出了一种低复杂度的水声OFDM子载波分配算法,以某个准则挑选出每轮待分配的候选节点,选择综合信道状态最差的节点分配子载波,在提高系统整体传输性能的同时兼顾了最差传感器节点的传输性能。此外,针对多轮分配的连续轮空现象,优先为上轮的"空闲"节点分配其上信道状况最好的子载波。仿真结果表明,改进的算法在几乎不降低原算法性能的前提下较好地解决了连续轮空的问题。算法的提出对水下多传感器组网的资源分配有一定的参考意义。In recent years,underwater acoustic communication technology based on OFDM modulation has been developed rapidly,with the advancement of the national strategy of Smart Ocean,as well as the demand of marine resource development.One of the key issues is the allocation of subcarrier in order to optimize the system performance.In this paper,a subcarrier allocation algorithm with low complexity for underwater OFDM acoustic communication system is proposed,candidate nodes are selected according to a certain criterion in each round,node with the worst comprehensive channel state is the final objective.The algorithm can improve the overall transmission performance of the system,and the transmission performance of the worst sensor node is considered as well.Besides,in case a certain node cannot get any subcarrier resource in multi-round allocations,the idle node in the last round is assigned the subcarrier with the best channel condition in front of other nodes.Simulation results show that the improvement of the algorithm can solve the problem on the premise of hardly reducing the performance of the original algorithm.The proposed algorithm has certain reference significance for the resource allocation of underwater multi-sensor network.

关 键 词：水声通信 正交频分复用 子载波分配 信道状态信息 计算复杂度 

分 类 号：TN929.3[电子电信—通信与信息系统]