High-rate multiuser communications in shallow water
High-rate multiuser communications in shallow water
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DOI：
10.1121/1.3488309
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发表时间：
2010-11-01
影响因子：
2.4
通讯作者：
Stevenson, M.
中科院分区：
文献类型：
--
作者：
Song, H. C.;Kim, J. S.;Stevenson, M.
浅水中的无源多用户通信先前使用时间反转方法在3-4 kHz频带中进行了演示。本文从三个方面对这些实验结果进行了扩展。首先，采用更高频率（11-19千赫）的更大带宽，允许使用各种符号速率（或带宽）。其次，检查了两种不同的整形脉冲：一个上升余弦滤波器和LFM（线性调频）啁啾。第三，采用空间零化的自适应时间反转方法抑制用户间的串扰。研究表明，使用更大的带宽和时间反转接收器是有益的，它可以以最小的计算复杂度处理显著的码间干扰。此外，由于数据速率的线性增长，增加每个用户会使性能降低约4 dB。研究表明，在2.2 km范围内，在浅水中使用16-QAM（正交调幅），分布在4.2 m深度上的三个用户可以在7.5 kHz带宽（8 bit /s Hz的频谱效率）下实现60 kbits/s的总数据速率。(C) 2010年美国声学学会。(DOI: 10.1121/1.3488309)
Passive multiuser communications in shallow water previously was demonstrated in the 3-4 kHz band using a time reversal approach. This paper extends those experimental results in three respects. First, a larger bandwidth at higher frequency (11-19 kHz) is employed allowing for the use of various symbol rates (or bandwidths). Second, two different shaping pulses are examined: a raised cosine filter and LFM (linear frequency modulation) chirp. Third, the adaptive time reversal approach with spatial nulling is applied to suppress the crosstalk among users. It is shown that the use of a larger bandwidth is beneficial along with the time reversal receiver which can handle significant intersymbol interference with minimal computational complexity. In addition, adding each user degrades the performance by about 4 dB for the benefit of linear increase in data rate. It is demonstrated that an aggregate data rate of 60 kbits/s can be achieved with a 7.5 kHz bandwidth (a spectral efficiency of 8 bits/s Hz) by three users distributed over 4.2-m depth at a 2.2 km range in shallow water using 16-QAM (quadrature amplitude modulation). (C) 2010 Acoustical Society of America. [DOI: 10.1121/1.3488309]