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

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, a...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2022-05, Vol.22 (10), p.3821
Main Authors: Han, Ruigang, Jia, Ning, Guo, Zhongyuan, Huang, Jianchun, Xiao, Dong, Guo, Shengming
Format: Article
Language:English
Subjects:
Acoustic propagation
Algorithms
binary continuous phase modulation
Bit error rate
Carrier frequencies
Channels
Communications systems
Decomposition
Equalization
Frequency domain analysis
Keying
Maximum likelihood estimation
Noise
Phase modulation
prefilter
Radio communications
Sea trials
Sensors
Shallow water
single-carrier frequency-domain equalization
Underwater acoustics
UWA communication
Water purification
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Summary: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 . 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.
ISSN:1424-8220
1424-8220
DOI:10.3390/s22103821