Prefiltered Single-Carrier Frequency-Domain Equalization for Binary CPM over Shallow Water Acoustic Channel

被引：2

作者：

Han, Ruigang ^{[1
,2
,3
]}

Jia, Ning ^{[1
,2
,3
]}

Guo, Zhongyuan ^{[1
,2
,3
]}

Huang, Jianchun ^{[1
,2
,3
]}

Xiao, Dong ^{[1
,2
,3
]}

Guo, Shengming ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Inst Acoust, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Key Lab Underwater Acoust Environm, Beijing 100190, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

SENSORS | 2022年 / 22卷 / 10期

关键词：

UWA communication; binary continuous phase modulation; single-carrier frequency-domain equalization; prefilter; CONTINUOUS-PHASE MODULATION;

D O I：

10.3390/s22103821

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The continuous phase modulation (CPM) technique is an excellent solution for underwater acoustic (UWA) channels with limited bandwidth and high propagation attenuation. However, the severe intersymbol interference is a big problem for the algorithm applying in shallow water. To solve this problem, an algorithm for prefiltered single-carrier frequency-domain equalization (PF-SCFDE) is presented in this paper. The regular whitening filter is replaced by a prefilter in the proposed algorithm. The output information sequence of this prefilter contains the forward information. To improve the performance, the output of the equalizer, combined with the forward information, is used to make the maximum likelihood estimation. The simulation results with minimum-shift keying and Gaussian-filtered minimum-shift keying signals over shallow water acoustic channels with low root mean square delay spread demonstrate that PF-SCFDE outperformed the traditional single-carrier frequency-domain equalization (SCFDE) by approximately 1 dB under a bit error rate (BER) of 10(-4). A shallow sea trial has demonstrated the effectiveness of PF-SCFDE; PF-SCFDE had a reduction in BER of 18.35% as compared to the traditional SCFDE.

引用

页数：13