深海走航剖面仪目标探测信号传输率优化仿真

The Optimal Simulation of Transmission Rate of Investigated Signal of Deep-Sea Underway Profiler

现有单载波传输方式下,深海走航投弃式剖面仪的信号幅值会随信号速率增大而剧烈衰减,从而使得信号传输准确性降低,严重影响了信号传输速率的提高。提出了对抗信道衰落和窄带干扰的正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术,以增加载波数量来提高信道带宽利用率,在保证准确性的同时提高投弃式温盐深剖面仪(Expendable Conductivity-Temperature-Depth profiler,XCTD)信号传输速率。设计了基于SIMULINK平台的OFDM算法仿真系统,从XCTD信道模型入手,针对不同的传输频率、探测深度和噪声量级,分析了OFDM算法与ASK、DPSK单载波的传输方式。通过OFDM算法与单载波传输方式对比的仿真结果表明,OFDM算法对于提高XCTD信号传输速率具有较高的可行性和有效性,对提高深海走航投弃式剖面仪信号传输速率的研究提供了一种新的思路。

In the mode of existing single-carrier transmission, the amplitude of the signal of deep-sea underway expendable profiler will be severely attenuated with the increase of the signal transmission rate, which results in lower accuracy of data transmission. So the situation seriously affects the raise of signal transmission rate. This paper pres- ented OFDM technology which can confront channel fading and narrowband interference. It improves the signal trans- mission rate of Expendable Conductivity-Temperature-Depth profiler under the condition of ensuring the accuracy with the increase of bandwidth utilization by increasing the number of carriers. We designed the simulation system of OFDM algorithm based on the SIMULINK simulation platform. Starting with the XCTD channel model, according to different transmission frequency, investigation depth and noise level, the paper analyzed OFDM algorithm and the sin- gle-carrier transmission mode of ASK, DPSK. the simulation results that OFDM algorithm is compared with the exist- ing single-carrier transmission mode show that OFDM algorithm has high feasibility and effectiveness for improving signal transmission rate of XCTD. It provides a new method for the research of improving the transmission rate of deep -sea underway expendable profiler.