2011•Shengxue jishuRequires access

An anti-multipath technique——Sweep-Spread Carrier modulation

Xin Zhang

Abstract

Underwater channel is a multipath,complex fading channel,which badly affects the data-rate and the per-formance 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 pa-per.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 fre-quency 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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Available abstract

Key concepts: Multipath propagation, Delay spread, Computer science, Multipath interference, Intersymbol interference, Underwater acoustic communication, Fading, Modulation (music)