单载波频域均衡技术及其在水声通信中的应用  

Single Carrier System with Frequency Domain Equalizer and It's Application in Underwater Acoustic Communications

作　　者：张涛[1] 黄建国[1] 何成兵[1] 

机构地区：[1]西北工业大学航海学院,陕西西安710072

出　　处：《探测与控制学报》2007年第4期52-56,共5页Journal of Detection & Control

基　　金：国家自然科学基金项目(60572098)

摘　　要：论述了水声通信单载波频域均衡(SC-FDE)的基本原理、系统框架以及在SC-FDE系统中所采用的基于导频的最小平方(LS)信道估计方法。针对水声通信信道的特点,分别对SC-FDE和OFDM在相同多径效应和多普勒频移条件下的性能进行了分析,结果表明:在较高信噪比条件下,SC-FDE可比OFDM更有效地对抗多径和多普勒频移的影响。此外,SC-FDE还能克服OFDM存在的峰平功率比(PAR)过大的问题。该技术在水声通信中有良好的应用前景。The basic principle and configuration of single carrier system with frequency domain equalizer （SC-FDE） are discussed. A channel estimator based on pilot and least square （LS） used in SC-FDE is described. Considering the characteristics of underwater acoustic channel, the performance of SC-FDE system and OFDM system are compared in the same condition of multi-path propagation and Doppler frequency-shift. The results show that when signal noise ratio is high,the performance of SC-FDE is better than that of OFDM to reduce the effect of multi-path propagation and Doppler frequency-shift. Furthermore, SC-FDE can overcome the problem of higher peak-to-average ratio （PAR） which exists in OFDM. SC-FDE is a promising technique used in underwater acoustic communications.

关 键 词：单载波频域均衡 多径效应 多普勒频移 最小平方 峰平功率比 

分 类 号：TN911.7[电子电信—通信与信息系统]