水下混叠广义频分复用多载波调制方法研究

An Underwater Overlapping Generalized Frequency Division Multiplexing Scheme

为提高水声通信系统的频谱效率及误码率性能,将混叠的概念引入了广义频分复用技术(GFDM)中,提出了混叠广义频分复用(O-GFDM)新型多载波调制方案.O-GFDM的发送矩阵及接收矩阵不再是传统的方阵,通过混叠系数来改变矩阵形状,从而提高频谱效率.给出了O-GFDM系统方案模型,并比较了几种主要调制方案的频谱效率分析及水声信道下误码率性能.结果表明,O-GFDM相对于正交频分复用(OFDM)、滤波器组多载波(FBMC)和GFDM表现出了更好的误码率特性和频谱效率.

For improving the spectrum efficiency and bit error rate(BER) performance of under underwater acoustic(UWA) communication system,a novel underwater multicarrier modulation scheme called overlapping generalized frequency division multiplexing(O-GFDM) is proposed.Different from the classical GFDM scheme,the transmitter matrix and receiver matrix of O-GFDM are no longer just the square matrix,and the shape of them can be changed according to the overlap coefficient,so as to improve the BER and spectrum efficiency of the system.The new O-GFDM system model is given and the spectrum efficiency and the BER performance of UWA channels are simulated.It is shown that O-GFDM achieves better error performance and higher spectrum efficiency than that of the orthogonal frequency division multiplexing(OFDM),filter bank multicarrier(FBMC) and GFDM schemes.