This paper introduces a frequency-hopped (FH) communication system to anti-intersymbol interferences (ISI) caused by the multipath propagation in shallow-water acoustic channels, and uses high-speed digital signal pro...This paper introduces a frequency-hopped (FH) communication system to anti-intersymbol interferences (ISI) caused by the multipath propagation in shallow-water acoustic channels, and uses high-speed digital signal processor (DSP) and serial ADC (MAX121) chip to demodulate received signal efficiently based Fast Fourier Transform (FFT) algorithm. The field experimental results show: a data rate of 1Kbit/s with the bit error rates on the order of 10 -4 is demonstrated at 2000 m in the shallow-water acoustic channel of Xiamen harbor, and the key techniques of the system is analyzed in the paper.展开更多
There exist strong multipath effects in a shallow water acoustic channel.The paper discusses some of these important effects. The statistical characteristics of multipath in shallow water are first described, then the...There exist strong multipath effects in a shallow water acoustic channel.The paper discusses some of these important effects. The statistical characteristics of multipath in shallow water are first described, then the anti-multi path ability of DTCA scheme is analysed. Theoretical estimations and field experiments have proved that both DTACA and DTCCA have a high ability of and-multipath and even make use of the multipath energy.展开更多
文摘This paper introduces a frequency-hopped (FH) communication system to anti-intersymbol interferences (ISI) caused by the multipath propagation in shallow-water acoustic channels, and uses high-speed digital signal processor (DSP) and serial ADC (MAX121) chip to demodulate received signal efficiently based Fast Fourier Transform (FFT) algorithm. The field experimental results show: a data rate of 1Kbit/s with the bit error rates on the order of 10 -4 is demonstrated at 2000 m in the shallow-water acoustic channel of Xiamen harbor, and the key techniques of the system is analyzed in the paper.
文摘There exist strong multipath effects in a shallow water acoustic channel.The paper discusses some of these important effects. The statistical characteristics of multipath in shallow water are first described, then the anti-multi path ability of DTCA scheme is analysed. Theoretical estimations and field experiments have proved that both DTACA and DTCCA have a high ability of and-multipath and even make use of the multipath energy.
