%0 Journal Article
%T A fractional Fourier transform每based channel estimation algorithm in single
%A Lanjun Liu
%A Lin Zhou
%A Qianxiang Yu
%A Qingsheng Zhao
%A Shukai Chi
%A Yanlong Li
%J International Journal of Distributed Sensor Networks
%@ 1550-1477
%D 2019
%R 10.1177/1550147719826001
%X Due to the complexity and variability of the underwater acoustic channel, the communication signal is affected by multi-path, time delay, and Doppler frequency shift. Based on the advantageous characteristics of fractional Fourier transform on chirp signal processing, a fractional Fourier transform每based algorithm using combined linear frequency每modulated signal is proposed, which can estimate parameters of underwater acoustic channel and has a better performance than the existing methods. To distinguish multi-user in underwater acoustic communication system, a single-carrier direct sequence code division multiple access communication system combined with the fractional Fourier transform每based algorithm is proposed. Thus, a preliminary study on underwater multi-target identification is carried out. The simulation and experimental results show that the fractional Fourier transform每based algorithm is simple and effective, and the energy can be focused at the ※best§ fractional order, which can directly determine the multi-path number and complete the channel estimation. The proposed single-carrier direct sequence code division multiple access communication system has good performance on bit error rate when we use corresponding spreading code to distinguish multi-user
%K Underwater acoustic channel
%K fractional Fourier transform
%K single-carrier direct sequence code division multiple access
%K multi-user distinction
%K bit error rate
%U https://journals.sagepub.com/doi/full/10.1177/1550147719826001