CAJ | 학술논문

对于OFDM水声通信系统，传统的基于数据辅助多普勒频移因子估计算法会降低系统的信息传输速率，对接收信号进行采样率转换通常采用重采样的方法，计算量较大。针对上述问题，提出基于过采样技术的多普勒频移因子估计算法及采样率转换算法，通过采用对系统发射信号与接收信号采样点数进行比较的方法，得到多普勒频移因子的估值。在此基础上，利用上述过采样数据和线性插值算法对接收信号进行采样率的转换。理论分析和仿真结果表明，改进算法在保证系统性能的同时，可以大幅减小接收机的计算量，适用于高速实时水声通信系统。
대우OFDM수성통신계통，전통적기우수거보조다보륵빈이인자고계산법회강저계통적신식전수속솔，대접수신호진행채양솔전환통상채용중채양적방법，계산량교대。침대상술문제，제출기우과채양기술적다보륵빈이인자고계산법급채양솔전환산법，통과채용대계통발사신호여접수신호채양점수진행비교적방법，득도다보륵빈이인자적고치。재차기출상，이용상술과채양수거화선성삽치산법대접수신호진행채양솔적전환。이론분석화방진결과표명，개진산법재보증계통성능적동시，가이대폭감소접수궤적계산량，괄용우고속실시수성통신계통。
To the Orthogonal Frequency Division Multiplexing(OFDM) Underwater Acoustic(UWA) communication systems, the traditional estimation algorithm based on data aided for Doppler Shift Factor(DSF) can reduce the system transmission rate. In addition, resampling algorithm is often used for the sample rate conversion in the receiving end, but there is a problem of large calculation in the process. Therefore, a novel algorithm about DSF estimation and sample rate conversion are proposed based on oversampling technique. The DSF can be estimated by comparing the sampling points with the transmitting and receiving signals. And the linear interpolation algorithm is adopted to finish the sample rate conversion. Theroy analysis and simulation results show that the algorithm not only can guarantee the system performance but also can reduce the receiver calculation amount. So it is applicable to the high-speed real-time UWA com-munication systems.