| 水声正交频分复用异步多用户接入方法 |
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| 引用本文： | 马璐,刘凇佐,乔钢,李雪.水声正交频分复用异步多用户接入方法[J].声学学报,2017,42(4):436-444. |
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| 作者姓名： | 马璐 刘凇佐 乔钢 李雪 |
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| 作者单位： | 1. 哈尔滨工程大学 水声技术重点实验室 哈尔滨 150001; |
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| 基金项目： | 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)和国家自然科学基金青年基金项目(61601136,61401114,61601137,61601138)资助 |
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| 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。
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| 关 键 词： | 水声信道 正交频分复用 异步多用户通信 干扰消除 |
| 收稿时间： | 2015-10-19 |
Asynchronous multiuser reception for underwater acoustic orthogonal frequency division multiplexing communications |
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| Affiliation: | 1. Acoustic Science and Technology Laboratory, Harbin Engineering University Harbin 150001;2. College of Underwater Acoustic Engineering, Harbin Engineering University Harbin 150001 |
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| Abstract: | Due to the large propagation delays in underwater acoustic channels, uplink synchronization is a great challenge in underwater acoustic sensor network, and thus the ability of asynchronous multiuser detection at the receiver is highly desired. A sliding iteration based asynchronous multiuser reception approach is proposed for the orthogonal frequency division multiplexing (OFDM) system, including overlapped truncation, interference cancellation, frequency- domain oversampling, multiuser channel estimation and data decoding, and interference reconstruction, which works in a sliding iteration fashion to eliminate the interference from the preceding and succeeding processing units. Simulation results show that the proposed method outperforms in terms of the bit-error-rate the block-by-block asynchronous multiuser receiver under different relative delays, and with or without channel estimation error. Pool experimental results show that the proposed approach achieves reliable two-user communications when the relative delay is no less than 1.5 times the CP duration in a multipath channel of 18 ms spreading delay. |
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