摘要
水声通信系统的目的在于高速、可靠地将信源信息经过海洋声信道传输到信宿。正交频分复用(OFDM)技术具有抗多径、频带利用充分、传输数据率高的优点,在水声通信中具有重要的发展前景。但随着传输距离的增加,信道条件恶化,多径、多普勒频移影响加剧,需要设计相适应的OFDM系统并采取有效手段改善系统性能。介绍了基于导频的OFDM信道估计的基本算法,主要研究了LS(最小平方误差)、LMMSE(线性最小均方误差)、LRLMMSE(低秩线性最小均方误差)算法,对各种算法的性能和复杂度进行了分析。
The purpose of the underwater acoustic communication system lies in dependablely transmiting the signal from the source to th, e end through ocean acoustic channel at high speed. Orthogonal Frequency Division Multiplexing （OFDM） is a method that can combat multipaths,fully use the fequency band,has high data rate and has a promising future in UWA communication. While longer the transmission range,worse the underwater conditions with multipaths and Doppler offset,which needs to design the system parameters and take practical methods to improve the system. In this paper,we introduce basic algorithm for OFDM channel etimation basised on pilot,mainly study on algorithm of LS （Least- Square）, LMMSE （Linear Minimum Mean Square Error）,LRLMMSE（Low Rank Linear Minimum Mean Square Error） and analyse the performance and complexity of different algorithms.
出处
《现代电子技术》
2007年第23期56-59,共4页
Modern Electronics Technique
