| 石维欣,张歆.一种抗信道多径的扫频-扩频调制技术[J].声学技术,2011,(4):369~372 |
| 一种抗信道多径的扫频-扩频调制技术 |
| An anti-multipath technique—Sweep-Spread Carrier modulation |
| 投稿时间：2010-09-03 修订日期：2010-11-15 |
| DOI： |
| 中文关键词: 抗多径技术 扫频-扩频载波调制 多径分离 水声通信 |
| 英文关键词: anti-multipath Sweep-Spread Carrier multipath separation underwater acoustic communication |
| 基金项目: |
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| 中文摘要: |
| 水声信道是复杂的多径快衰落信道,其信道特性严重影响了水声通信的数据率和性能,抗多径干扰是提高水声通信系统性能的重要技术之一。对一种新的调制方法——扫频-扩频载波(Sweep-Spread Carrier,SSC)调制技术进行了深入研究,通过系统在水声信道实际数据的仿真,探究SSC的抗多径性能,简化了抗信道多径算法。SSC的基本思路是采用连续变化的载波频率,通过相关接收,将接收的多径信号在频域上分离,从而克服了码间干扰的影响。分析了在给定系统时不同信道多径时延对SSC性能的影响,以及给定信道时不同SSC参数对SSC性能的影响。仿真结果表明,选择合适的参数,SSC调制具有良好的抗多径性能。 |
| 英文摘要: |
| Underwater channel is a multipath,complex fading channel,which badly affects the data-rate and the performance of underwater acoustic communication.Anti-multipath is an important measure to improve the performance of underwater acoustic communication.A new modulation method– SSC(Sweep-Spread Carrier) is studied in this paper.Through the simulation with actual data of underwater acoustic channel,the anti-multipath performance of SSC is investigated and the anti-multipath algorithm simplified.The basic idea of SSC is that the continuously variable frequency of the carrier is used to change the time-delay caused by multipath channel into frequency interval,and so the multipath-signals are separated in frequency domain,which well overcomes the intersymbol interference(ISI).The ef-fects of the different multipath channels and the different parameters of SSC for a given channel on the performances of SSC are analyzed.Simulation results confirm that the SSC modulation method has a good performance of an-ti-multipath for appropriately selected parameters. |
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