MIMO-OFDM for High-Rate Underwater Acoustic Communications
MIMO-OFDM for High-Rate Underwater Acoustic Communications
复制标题
DOI：
10.1109/joe.2009.2032005
复制
发表时间：
2009-10-01
影响因子：
4.1
通讯作者：
Willett, Peter
中科院分区：
文献类型：
--
作者：
Li, Baosheng;Huang, Jie;Willett, Peter
多输入多输出（MIMO）技术是近年来水声通信领域的一个研究热点。在这个通信中，我们提出了一个MIMO系统的设计，其中空间复用与正交频分复用（OFDM）信号。建议的接收机工作在逐块的基础上，其中空子载波用于多普勒补偿，导频子载波用于信道估计，并且由连续干扰消除和软最小均方误差（MMSE）均衡的混合使用组成的MIMO检测器与低密度奇偶校验（LDPC）信道解码耦合，用于每个子载波上的迭代检测。所提出的设计已经过测试，从三个不同的实验记录的数据。在一个实验中，接近3.5 B/s/Hz的频谱效率，而在另一个实验中，在62.5 kHz的带宽上实现了125.7 kb/s的数据速率。这些结果表明，MIMO-OFDM是一个有吸引力的解决方案，在水声信道上的高数据速率传输。
Multiple-input-multiple-output (MIMO) techniques have been actively pursued recently in underwater acoustic communications to increase the data rate over the bandwidth-limited channels. In this communication, we present a MIMO system design, where spatial multiplexing is applied with orthogonal-frequency-division-multiplexing (OFDM) signals. The proposed receiver works on a block-by-block basis, where null subcarriers are used for Doppler compensation, pilot subcarriers are used for channel estimation, and a MIMO detector consisting of a hybrid use of successive interference cancellation and soft minimum mean square error (MMSE) equalization is coupled with low-density parity-check (LDPC) channel decoding for iterative detection on each subcarrier. The proposed design has been tested using data recorded from three different experiments. A spectral efficiency of 3.5 b/s/Hz was approached in one experiment, while a data rate of 125.7 kb/s over a bandwidth of 62.5 kHz was achieved in another. These results suggest that MIMO-OFDM is an appealing solution for high-data-rate transmissions over underwater acoustic channels.