单矢量差分幅度相移键控正交频分复用水声通信研究

为了在不牺牲通信带宽利用率的前提下，进一步提高水声通信质量，在描述高阶差分幅度相移键控调制技术和单矢量信号处理技术的基础上，基于矢量水听器和高阶差分调制技术，提出一种应用于正交频分复用（OFDM）通信体制中的高速水声通信系统。根据实际水域声速梯度真值，利用信道仿真软件建模实际水声信道，仿真研究通信系统在此信道下的通信性能。研究结果表明：对矢量水听器采集的声压和振速通道信号进行p+3v_c线性联合处理可获得增益，单矢量差分幅度相移键控OFDM通信系统比标量差分幅度相移键控OFDM系统的通信效果有明显改善，验证了该系统的可行性和优越性。

Research on Orthogonal Frequency Division Multiplexing Underwater Communication Based on Differential Amplitudeand Phase-shift Keying Modulation Using Acoustic Vector Sensor

To further improve the quality of underwater acoustic communication on the premise that the bandwidth utilization rate is not reduced, an orthogonal frequency division multiplexing (OFDM) underwater communication system using acoustic vector sensor and differential amplitude and phase-shift keying (DAPSK) modulation is presented by describing the principle of DAPSK modulation and vector signal processing technology. According to the actual sound velocity gradient, the true acoustic channel is modulated using the channel modulator. The performance of system is researched. The results show that the spatial gain can be obtained by the linear combined signal processing, including pressure and particle velocity data from acoustic vector sensor gains. And the performance of OFDM underwater communication system using acoustic vector sensor and DAPSK modulation is better than that of the scalar one.