FDM与MFSK相结合的水声远程信息传输

针对远程、低误码率水声信息传输的要求,提出了将频分多路（FDM）与多进制频移键控（MFSK）调制相结合的信息传输方式.发射端在两个子信道中分别进行MFSK调制,并将两个子信道中的相应频点在单个码元周期内进行并行传输.接收端对各码元接收信号通过周期图法进行谱分析,并根据周期图上尖峰的位置估计出该码元内所包含的发射频点,从而实现频域解调.海上试验结果表明,该技术可以实现30 km距离、13.3 bit/s数据率信息的可靠传输.

Long-Range Underwater Acoustic Information Transmission for Combining FDM and MFSK

Aimed at the requirement of the long-range underwater acoustic information transmission with the low bit-error rate(BER),the method for combining the frequency division multiplexing(FDM) and the M-ary frequency shift keying(MFSK) is proposed.The transmitter end conducts MFSK modulation in each sub-channel,and transmits carrier frequencies belonged to different sub-channels in parallel.Firstly,the receiver end conducts the periodogram estimation in the frequency domain.Then it takes locations of spectral peaks as carrier frequencies,and conducts the demodulation according to the relationship between the carrier frequency and the transmitted information.Experimental results on the ocean indicate that information of 13.3 bit/s over the 30 km distance is sucessfully transmitted.