基于索引调制的FBMC水声通信技术研究

Research on FBMC underwater acoustic communication technology based on index modulation

针对传统多载波调制系统在水声通信中无法获得更优的频谱效率和误码率性能的问题,将索引调制引入到传统多载波FBMC系统中,提出了一种基于滤波器组多载波的索引调制(FBMC-IM)技术。该技术利用子载波索引来控制载波的激活,可灵活的调整静默子载波数和激活子载波数使系统具有更优的传输性能。解决了传统多载波调制系统在水声通信中性能较差的问题。最后在实测水声信道下进行仿真,仿真结果表明基于滤波器组多载波的索引调制(FBMC-IM)系统可以通过选择激活不同子载波数目来获得比传统多载波调制系统更优的频谱效率和误码率性能,证明了该方法的有效性。

Aiming at the problem that the traditional multicarrier modulation system can not get better spectrum efficiency and bit error rate performance in underwater acoustic communication,index modulation is introduced into traditional multicarrier FBMC system,and a modulation technology called FBMC-IM has been proposed.Subcarrier index is used to control the activation of carrier,which can flexibly adjust the number of silent subcarriers and activated subcarriers to make the system have better transmission performance.The problem of poor neutral performance of traditional multicarrier modulation system in underwater acoustic communication is solved.Finally,the simulation results show that the FBMC-IM system based on filter bank multicarrier can achieve better spectral efficiency and BER performance than the traditional multicarrier modulation system by activating different number of subcarriers and the effectiveness of the method is proved.