水声正交频分复用异步多用户接入方法

发布时间：2018-01-10 21:02

本文关键词：水声正交频分复用异步多用户接入方法　出处：《声学学报》2017年04期 　论文类型：期刊论文

【摘要】：水声信道传播时延大导致水声通信网中上行用户同步困难,因此需要接收端具备异步多用户检测能力。针对水声正交频分复用(OFDM)异步多用户系统提出一种基于滑动迭代的异步多用户接入方法,包括重叠截断、干扰消除、频域过采样、多用户信道估计与解码、以及干扰重构5个处理模块,并通过滑动迭代结构同时消除前向干扰和后向干扰影响。仿真结果表明,所提方法在不同异步到达时延,以及有、无信道估计误差下的误比特率均明显低于逐块解调异步接收算法。水池实验结果表明,滑动迭代异步接收算法在多径扩展18 ms、异步到达时延大于或等于循环前缀1.5倍时实现了两用户异步接入的可靠通信。
[Abstract]:Underwater acoustic channel propagation delay to uplink user synchronization in underwater acoustic communication network is difficult, therefore need the receiver with asynchronous multi-user detection capability. UWA orthogonal frequency division multiplexing (OFDM) asynchronous multi-user system proposes an asynchronous iterative sliding method based on multi user access, including overlapping truncation, interference cancellation, frequency sampling, multi the user channel estimation and decoding, interference and reconstruction of 5 processing modules, and by sliding forward iterative structure and eliminate the interference and backward interference. The simulation results show that the proposed method in different time of arrival, and there is no asynchronous channel estimation error, the bit error rate under the block was significantly lower than that of the asynchronous receive demodulation algorithm. Experimental results show that the iterative algorithm is extended to 18 sliding asynchronous receiver in multipath MS, asynchronous arrival delay is greater than or equal to 1.5 times the cyclic prefix is achieved when two user asynchronous connection Reliable communication in.

【作者单位】：哈尔滨工程大学水声技术重点实验室;哈尔滨工程大学水声工程学院;
【基金】：国家自然科学基金重点项目(61431004)、国家自然科学基金面上项目(11274079),国家自然科学基金青年基金项目(61601136,61401114,61601137,61601138)资助
【分类号】：TN929.3
【正文快照】： 网络的物理层通信技术受到越来越多的关注水2,^. 声传感器网络由于受到水声信道有限带宽的限制,如何在有限的频谱资源中提高带宽利用率,增大网随着海洋开发的不断深入,应用于水声传感器络吞吐量,成为当前的研究热点[51。空分多址接入 (space-division multiple access,SDMA)

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